FAIRCHILD SLTS218B handbook
Contents
1. In no event shall TI s liability arising out of such information exceed the total purchase price of the TI part s at issue in this document sold by TI to Customer on an annual basis Addendum Page 1 MECHANICAL DATA ERH R PDSS T10 DOUBLE SIDED MODULE Suffix H 2 22 56 39 2 000 50 80 60 040 1 02 10 Places Note F G yt Lowest Component 0 010 MIN 0 25 Bottom side Clearance 0 175 4 44 4 Places f 14 E n ELLA TOP VIEW Host Board 0 472 12 00 MAX 2 260 57 40 SIDE VIEW 2 000 50 80 0 175 4 44 4 Places 80 055 1 40 Min 10 Places Plated through hole PCB Layout 4205250 A 07 03 NOTES A All linear dimensions are in inches mm F Pins are 0 040 1 02 diameter with B This drawing is subject to change without notice 0 070 1 78 diameter standoff shoulder C 2 place decimals are 0 020 0 51mm G All pins Material Copper Alloy D 3 place decimals are 0 010 0 25mm Finish Tin 100 over Nickel plate E Recommended keep out area for user components Texas wien ticom MECHANICAL DATA ERJ R PDSS B10 DOUBLE SIDED MODULE 2 22 56 39 2 000 50 80 a Solder Ball 40 040 1 02 10 Places See Note I 0 175 10 125 3 18 19 05 4 44 0 125 3 4 Places 6 TOP VIEW SIDE VIEW 2 260 57 40 0 130 22. Dual Output 48 V Input Isolated DC DC Converter for xDSL Features Dual Outputs Independently Regulated Input Voltage Range 36 V to 75 V Power up Down Sequencing 1500 VDC Isolation Over Current Protection Over Temperature Shutdown Under Voltage Lockout SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 Fixed Frequency Operation Temp Range 40 to 100 C Industry Standard Outline Operates with PTB4851x for Complete AC7 Power Solution Powers up to 64 DSL Ports Safety Approvals UL cUL 60950 EN 60950 Description The PTB4850x power modules are a dual output isolated DC DC converter designed to provide the logic supply volt ages for AC 7 based xDSL applications The PTB48500 is rated for 13 A of total output current making it suitable for 32 channel xDSL applications The PTB48501 and PTB48502 provide output current for powering up to 64 xDSL chan nels The P TB48501 is rated for 16 5 A total output current and the PTB48502 21 A The PTB48502 incorporates 10 W of additional capacity for powering periph eral circuitry Any of these converters can be used for other applications with simi lar power requirements The modules operate from a standard telecom 48 V central office CO supply and include an on off enable control Stand Alone Application output current limit over temperature protection input under voltage lockout UVLO The PTB48500 and PTB48501 also incorporates a power
3. 2 mA Internal Input Capacitance Ci 2 pF External Output Capacitance Co 0 6 5 000 iF Coz 0 5 000 p Reliability MTBF Per Telcordia SR 332 15 pE 106 Hrs 50 stress Ta 40 C ground benign Notes 1 See Safe Operating Area curves or contact the factory for the appropriate derating 2 The On Off Enable pin 3 has an internal pull up and may be controlled with an open collector or open drain transistor The input is diode protected and may be connected to V1 The maximum open circuit voltage is 7 V If it is left open circuit the converter will operate when input power is applied 3 An output capacitor is not required For technical support and further information visit http powerti com 4i TEXAS INSTRUMENTS PTB48500 Typical Characteristics Dual Output 48 V Input Isolated DC DC Converter for xDSL SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 PTB48500A Characteristic Data See Note A Safe Operating Area PTB48500A See Note C Efficiency vs Load Current See Note B Vin 48 VDC See Note B 100 90 80 90 o Z 70 Airflow x 80 a 400LFM g 3 200LFM 3 g 100LFM 70 z 2 Nat Conv v 2 40 60 amp 30 50 20 0 2 4 6 8 10 12 0 5 10 15 20 25 30 lo lo A Total Output Power W Power Dissipation vs Load Current Se
4. R2 21 0 848 N A 0 5 kQ 20 0 960 0 3 ka 1 4 kQ 19 0 972 1 5 kQ 2 3 kQ 18 0 984 2 9 kQ 3 4 kQ 17 0 996 4 4 ka 4 6 kO 16 1 008 6 1 kQ 5 9 kQ 15 1 020 8 0 kQ 7 4 kQ 14 1 032 10 2 kQ 9 1 kQ 13 1 044 12 7 kQ 11 1 kQ 12 1 056 15 7 kQ 13 4 kQ Eii 1 068 19 2 kQ 16 1 kQ 10 1 080 23 4 kQ 19 4 kQ 2310 1 092 28 6 kQ 23 4 k o 1 104 35 kQ 28 4 k2 ary 1 116 43 2 ka 34 8 ka 6 1 128 54 2 kQ 43 4 ko 5 1 140 69 7 kQ 55 4 k 4 1 152 92 8 ka 73 4 kQ 3 1 164 131 kQ 103 0 kQ 2 1 176 208 kQ 163 0 kQ 1 188 440 ko 343 0 kQ 0 1 200 1 1 212 148 kQ 108 0 kQ 2 1 224 65 8 kQ 48 0 kQ 3 1 236 38 4kQ 28 1 kQ 4 1 248 24 6 kQ 18 1 kQ 5 1 260 16 4kQ 12 1 kQ 6 1 272 10 9 kQ 8 1 kQ 7 1 284 7 kQ 5 3 kQ 8 1 296 4 1 kQ 3 2 kQ 9 1 308 1 8 kQ 1 5 kQ 10 1 320 0kQ 0 2 kQ R Adjust up R2 Adjust down Ki TEXAS INSTRUMENTS For technical support and further information visit http power ti com Application Notes PTB4850x amp PTB4851x Configuring the PTB4850x amp PTB4851x DC DC Converters for DSL Applications When operated as a pair the PTB4850x and PTB485 1x converters are specifically designed to provide all the required supply voltages for powering xDSL chipsets The PTB4850x produces two logic voltages They include a 3 3 V source for logic and I O and a low voltage for powering a digital signal processor core The PTB485 1x produces a b
5. Vin A logic 0 at this pin disables the module s outputs and a high impedance enables the out puts If not used the pin should be left unconnected EN Out This open collector output may be used to enable the output of other DC DC converters in applications where the power up sequence of the related voltages must be precisely controlled The output is used principally to control the startup up of a PTB4851xx module when powering ADSL circuits based on the AC7 chipset The signal is referenced to Vin and is active low It is initially off high impedance and turns on when the output voltage Voy has risen to its nominal set point voltage Syne Out The signal generated by this pin is designed to be used exclusively with the PTB48510 in AC7 ADSL applications When the Sync Out of this converter is connected directly to the Sync In pin of the PTB48510 both modules will operate at the same switch conversion frequency POR Available to PTB48500 and PTB48501 only This pin produces an active low power on reset signal that may be used to reset logic circuitry The output is set low during power up just as the output voltage from Vo starts to rise It remains low for 10 ms after the volt age at Vo has reached its nominal set point voltage This signal is referenced to the COM node and has a 3 3 kQ internal pull up resistor to Vo Environmental and General Specifications Unless otherwise stated
6. Options PT4850xx00 Order Prefix Description Code Voltage Code Description Pkg Ref 1 PTB48500xxx 13A 32 Ports A 38 WF V AH Horiz T H ERH PTB48501xxx 16 5 A 48 64 Ports AS SMD Standard 2 ERJ PTB48502xx 21A 64 Ports 10 W Notes 1 Reference the applicable package reference drawing for the dimensions and PC board layout 2 Standard option specifies 63 37 Sn Pb pin solder material Pin Descriptions V The positive input supply for the module with respect to V When powering the module from a 48 V telecom central office supply this input is connected to the primary system ground V The negative input supply for the module and the 0 VDC reference for the Enable EN Out and Sync Out signals When the module is powered from a 48 V supply this input is connected to the 48 V Return Vo 1 The higher regulated power output voltage which is referenced to the COM node Vo 2 The lower regulated power output voltage which is referenced to the COM node COM The secondary return reference for the module s two regulated output voltages It is dc isolated from the input supply pins Vo 2 Adjust Using a single resistor this pin allows Voz to be adjusted higher or lower than the preset value If not used this pin should be left open circuit Enable This is an open collector open drain positive logic input that enables the module output This pin is referenced to
7. Power Dissipation W a Output Load Cross Regulation AV vs AV lo 1 A amp Vi 48 V 6 6 a4 s4 S E E 1 1 2 2 o 2 c eee e s S x Vo vs lo o 0 3 a Vo vs lo 3 D i 2 2 m 2 3 3 g o 2 C4 o 4 6 6 0 2 4 6 8 10 0 2 4 6 8 10 12 lo lo A Safe Operating Area Vin 48 V See Notes B C lo loz A Safe Operating Area Viy 48 V See Notes B C 90 90 mete e fot 80 a gt 80 od os ES hEN P 1 Airflow 1 Airflow g 70 g 70 Ss S OSS zi 5 6 NER 400LFM 60 400LFM 2 Ne A 200LFM na 200LFM 5 a 100LFM 5 5 100LFM E Nat conv E Nat conv E E 2 gt 40 z 2 40 N iN lt 4 lt 30 30 20 20 Output Load 0 10 20 30 40 50 60 70 80 90 100 Output Load Note A Characteristic data has been developed from actual products tested at 25 C This data is considered typical data for the converter Note B Load current is increased proportionally from both outputs up to the indicated maximum value of each respective output Note C SOA curves represent the conditions at which internal components are at or below the manufacturer s maximum operating temperatures Derating limits
8. Vo 02V 0 10 5 0 Io Io Total both outputs 0 16 5 A Output Voltage Voi Tnlcudes set point line load 32 3 3 3 4 Vv Voz 40 lt Ty lt 85 C 1 16 12 1 24 Temperature Variation ARegtemp 40 lt T lt 85 C Io I min Vo 0 5 V Vo2 0 8 i Line Regulation ARegline Over Vi range Voi Vo2 l 10 mV Load Regulation ARegload Over I range Voi Voz 3 12 mV Cross Regulation ARe amp cross To min lt Io lt Iomax Io 1 A AVo1 10 nV To min lt Io lt Iomax Io 1 A AVo2 10 Efficiency n Tou Io2 Iomax 81 Vo Ripple pk pk V 20 MHz bandwidth Ve 20 50 o Ripple pk pk f andwi m E oH af mVpp Transient Response r 1 A ps load step 50 to 100 Ismax 30 ps AV Voy Vo over undershoot 2 0 Vo Over Current Threshold To trip Vi 36V Telos 24 A reset followed by auto recovery 1 g Output Voltage Adjust Range Vadj Vo only 20 10 Vo Switching Frequency fs Over Vi and Io ranges 500 550 600 kHz Under Voltage Lockout Viron Vy increasing 34 V Vi off Vi decreasing 32 On Off Enable pin 3 Referenced to Vj pin 5 Input High Voltage Vin 43 6 75 Q v Input Low Voltage Vit 0 2 0 8 Input Low Current I mA Standby Input Current Ir standby pins 3 amp 5 connected 2 mA Internal Input Capacitance Cy 2 pF External Output Capacitance Co 0 6 5 000 iF Co 0 8 5 000 p Reliability MTBF Per Telcordia SR 332
9. all voltages are with respect to Vin Characteristics Symbols Conditions Min Typ Max Units Input Voltage Range War Over output load range 36 48 75 VDC Isolation Voltage Input output input case 1500 V Capacitance Input to output 1500 F Resistance Input to output 10 Mo Operating Temperature Range Ir Over Vin Range 40 85 XG Over Temperature Protection OBE Shutdown threshold 115 C Hysterisis 10 Solder Reflow Temperature TA Surface temperature of module body or pins 235 C Storage Temperature Tle 40 125 C Mechanical Shock Per Mil STD 883D Method 2002 3 _ 500 po Gs 1 msec Sine mounted Mechanical Vibration Mil STD 883D Method 2007 2 Suffix H 20 Gs 20 2000 Hz Suffix C 5 Weight 20 grams Flammability Meets UL 94V O Notes i During reflow of SMD package version do not elevate peak temperature of the module pins or internal components above the stated maximum 4 TEXAS INSTRUMENTS For technical support and further information visit http power ti com PTB48500 Dual Output 48 V Input Isolated DC DC Converter for xDSL SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 Specifications Unless otherwise stated Ta 25 C Vj 48 V C1 0pF Co 0 pF and Io 50 I max PTB48500A Characteristic Symbol Conditions Min Typ Max Unit
10. up reset POR output The modules are designed to operate with one of the PTB4851x DC DC con verter modules The combination of a PTB4850x and PTB4851x converter provides the complete the power supply for an AC7 chipset The EN Out and Sync Out pins provide compatible out put signals for controlling both the power up sequence and switching frequency of the PTB48510 The PTB4850x modules employ double sided surface mount construction and are an industry standard size Pin Configuration Pin Function V Sync Out Enable EN Out Vi Vo 2 COM POR COM t Voz Adjust Vol NO CO INT A iy BY WY Re e Shaded functions indicate signals that are referenced to V7 Denotes positive logic Open Normal operation Vr Outputs Off Denotes negative logic High Normal operation Low Reset This pin is COM on the PTB48502 Sync Out EN Out PTB4850x POR Vo Voz 3 Voz Adj Enable COM 2 4_ Pin 8 is COM on PTB48502 8 Vo OO o Voz _ 9 For technical support and further information visit http power ti com i TEXAS INSTRUMENTS PTB48500 PTB48501 PTB48502 Dual Output 48 V Input Isolated DC DC Converter for xDSL SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 Ordering Information Base Part No PTB48500 xxx Output Voltage PTB4850xOxx Package
11. 000 50 80 0 175 4 44 4 Places Lowest Component 0 010 MIN 0 25 Bottom side Clearance Host Board 60 085 2 16 10 Places See Note F G amp H L PCB Layout 4205251 B 12 03 NOTES A All linear dimensions are in inches mm G Paste screen opening 0 080 2 03 to 0 085 2 16 B This drawing is subject to change without notice Paste screen thickness 0 006 0 15 C 2 place decimals are 0 020 0 51mm H Pad type Solder mask defined D 3 place decimals are 0 010 0 25mm I All pins Material Copper Alloy E Recommended keep out area for user components E ae F Power pin connection should utilize four or more vias Finish Tin 100 over Nickel plate Solder Ball See product data sheet to the interior power plane of 0 025 0 63 I D per input J Dimension prior to reflow solder ground and output pin or the electrical equivalent ve TEXAS INSTRUMENTS www ti com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl reserve the right to make corrections modifications enhancements improvements and other changes to its products and services at any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to Tl s terms and conditions of sale suppli
12. 15 _ 106 Hrs 50 stress Ta 40 C ground benign Notes 1 See Safe Operating Area curves or contact the factory for the appropriate derating 2 The On Off Enable pin 3 has an internal pull up and may be controlled with an open collector or open drain transistor The input is diode protected and may be connected to V1 The maximum open circuit voltage is 7 V If it is left open circuit the converter will operate when input power is applied 3 An output capacitor is not required For technical support and further information visit http powerti com 4i TEXAS INSTRUMENTS PTB48501 Typical Characteristics Dual Output 48 V Input Isolated DC DC Converter for xDSL SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 PTB48501A Characteristic Data See Note A Safe Operating Area PTB48501A See Note C Efficiency vs Load Current See Note B Vin 48 VDC See Note B 100 90 80 90 g 7 Vn 2 70 Airflow 80 3 400LFM a3 y 3 200LFM 3 75V Eo 100LFM 70 z Nat conv S 40 60 lt 30 50 20 0 3 6 9 12 15 18 0 8 16 24 32 lo lo A Output Power W Power Dissipation vs Load Current See Note B 12 10 8 s av 6 tae 36V 5 ae 75V a bog 4 2 dems E poate 0 0 3 6 9 12 15 18 lo lo A Cross Regulation AVo vs loy lo 1 A a
13. OD ERH 10 9 TBD Call TI Level 1 235C UNLIM ULE PTB48500AAS ACTIVE DIP MOD ERJ 10 9 TBD Call TI Level 1 235C UNLIM ULE PTB48500AAZ ACTIVE DIP MOD ERJ 10 9 Pb Free Call Tl Level 3 260C 168 HR ULE RoHS PTB48501AAH ACTIVE DIP MOD ERH 10 9 TBD Call TI Level 1 235C UNLIM ULE PTB48501AAS ACTIVE DIP MOD ERJ 10 9 TBD Call TI Level 1 235C UNLIM ULE PTB48501 AAZ ACTIVE DIP MOD ERJ 10 9 Pb Free Call TI Level 3 260C 168 HR ULE RoHS PTB48502AAH ACTIVE DIP MOD ERH 10 9 TBD Call TI Level 1 235C UNLIM ULE PTB48502AAS ACTIVE DIP MOD ERJ 10 9 TBD Call TI Level 1 235C UNLIM ULE PTB48502AAZ ACTIVE DIP MOD ERJ 10 9 Pb Free Call TI Level 3 260C 168 HR ULE RoHS The marketing status values are defined as follows ACTIVE Product device recommended for new designs LIFEBUY TI has announced that the device will be discontinued and a lifetime buy period is in effect NRND Not recommended for new designs Device is in production to support existing customers but TI does not recommend using this part in a new design PREVIEW Device has been announced but is not in production Samples may or may not be available OBSOLETE TI has discontinued the production of the device 9 Eco Plan The planned eco friendly classification Pb Free RoHS or Green RoHS amp no Sb Br please check http Awww ti com productcontent for the latest availability information and additional product content details TBD The Pb Free Green conversion plan has not be
14. a lt 85 1 16 12 1 24 Temperature Variation ARegtemp 40 lt T 4 lt 485 C Io I gt min Vo 0 5 V Vo2 0 8 i Line Regulation ARegline Over V1 range Voi Vo2 l 10 mV Load Regulation ARegload Over Io range Voi Voz 3 12 mV Cross Regulation ARe amp cross To min lt Io lt Igmax Io 1 A AVo1 10 nV To min lt Io lt Iomax Io 1 A AVo2 10 Efficiency n Tou Io2 Iomax 82 Vo Ripple pk pk V 20 MHz bandwidth Ve 20 50 o Ripple pk pk i andwi m E a af mVpp Transient Response r 1 A ps load step 50 to 100 I max 30 ps AVr Vo1 Voz over undershoot 2 0 Vo Over Current Threshold I trip Vi 36V Telos 24 A reset followed by auto recovery 1 g Output Voltage Adjust Range Vadj Vo only 20 10 Vo Switching Frequency fs Over Vj and I ranges 500 550 600 kHz Under Voltage Lockout Viron Vy increasing 34 V Vi off Vi decreasing 32 On Off Enable pin 3 Referenced to Vj pin 5 Input High Voltage Vin 43 6 75 Q v Input Low Voltage Vit 0 2 0 8 Input Low Current I a mA Standby Input Current Ir standby pins 3 amp 5 connected 2 mA Internal Input Capacitance Cy 2 pF External Output Capacitance Co 0 6 5 000 iF Co 0 8 5 000 p Reliability MTBF Per Telcordia SR 332 15 _ 106 Hrs 50 stress Ta 40 C ground benign Notes 1 See Safe Operating Area curves or contact the factory for the appropriate der
15. alanced pair of complementary supply voltages that is required for the xDSL transceiver ICs When used together in these types of applications the PTB4850x and PTB4851x may be configured for power up sequencing and also synchronized to a common switch conversion frequency Figure 2 1 shows the required cross connects between the two converters to enable these two features Switching Frequency Synchronization Unsynchronized the difference in switch frequency introduces a beat frequency into the input and output AC ripple components from the converters The beat frequency can vary considerably with any slight variation in either converter s switch frequency This results in a variable and undefined frequency spectrum for the ripple waveforms which would normally require separate filters at the input of each converter When the switch frequency of the converters are synchronized the ripple components are constrained to the fundamental and higher This simplifies the design of the output filters and allows a common filter to be specified for the treatment of input ripple Power Up Sequencing The desired power up sequence for the AC7 supply volt ages requires that the two logic level voltages from the PTB4850x converter rise to regulation prior to the two complementary voltages that power the transceiver ICs This sequence cannot be guaranteed if the PTB4850x and PTB4851x are allowed to power up independently especially if the 48 V inp
16. apply to modules soldered directly to a 4 in x 4 in double sided PCB with 1 oz copper wy TEXAS INSTRUMENTS For technical support and further information visit http power ti com Application Notes PTB48500 PTB48501 amp PTB48502 Adjusting the Lower Output Voltage of the PTB4850x Series of DC DC Converters The PTB4850x series of DC DC converters are de signed to produce two logic level supply voltages for use with the AC 7 ADSL chipset The magnitude of lowest output voltage Vo gt can be adjusted higher or lower by up to 10 or 20 of the nominal The adjust ment method uses a single external resistor 1 The value of the resistor determines the amount of adjustment and its placement determines whether the voltage is increased or decreased The resistor values can be calcu lated using the appropriate formula see below or simply selected from the range of values given in Table 1 2 The placement of each resistor is as follows Adjust Up To increase the magnitude of both output volt ages place a resistor R between Voz Adj pin 9 and the Voz pin 6 voltage rail see Figure 1 1 a Figure 1 la PTB4850x Vo Voz 6 Oo Ri Adjust Up Voz Adj 2 7 COM Vv Adjust Down To decrease the magnitude of both output voltages add a resistor R2 between Voz Adj pin 9 and the COM pin 7 voltage rail see Figure 1 1 b Figure 1 1b A eee PTB4850x Voz Vo Vos Adj Re Adj D
17. ating 2 The On Off Enable pin 3 has an internal pull up and may be controlled with an open collector or open drain transistor The input is diode protected and may be connected to Vq The maximum open circuit voltage is 7 V If it is left open circuit the converter will operate when input power is applied 3 An output capacitor is not required For technical support and further information visit http powerti com 4i TEXAS INSTRUMENTS PTB48502 Dual Output 48 V Input Isolated DC DC Converter for xDSL PTB48502A Characteristic Data See Note A loz 10 A loz 10 A represents 100 load Efficiency vs Load Current See Note B Typical Characteristics SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 PTB48502A Characteristic Data See Note A lo1 8 A loz 13 A represents 100 load Efficiency vs Load Current See Note B 100 90 90 Vi Vi x x a 80 36V gt eo 36V 5 48V 5 48V E v 75V E a 11 75V wW wW 60 60 50 50 0 20 40 60 80 100 0 20 40 60 80 100 Output Load Output Load Power Dissipation vs Load Current See Note B Power Dissipation vs Load Current See Note B 12 12 10 10 Power Dissipation W Output Load Cross Regulation AV vs AVy lo 1 A amp V 48 V
18. e Note B 10 8 4 Vin 26 a 4 24 0 0 2 4 6 8 10 12 lo lo A Cross Regulation AVo vs loy lo 1 A amp Vin 48 V 6 4 gt E gt 2 lt 5 D b a Vo vs lo Voz vs lo D oe 2 oO o 6 4 6 0 al 2 3 4 5 6 7 lo lo A Note A Characteristic data has been developed from actual products tested at 25 C This data is considered typical data for the converter Note B Load current is increased proportionally from both outputs up to the respective maximum value of each output Note C SOA curves represent the conditions at which internal components are at or below the manufacturer s maximum operating temperatures Derating limits apply to modules soldered directly to a 4 in x 4 in double sided PCB with 1 oz copper sip TEXAS INSTRUMENTS For technical support and further information visit http power ti com PTB48501 Dual Output 48 V Input Isolated DC DC Converter for xDSL SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 Specifications Unless otherwise stated Ta 25 C Vy 48 V Cj 0 pF Co 0 pF and Io 50 Io max PTB48501A Characteristic Symbol Conditions Min Typ Max Units Output Power Po Po2 Vo 3 3 V 19 8 w Voz 1 2 V 12 6 Po total Both outputs 324 W Output Current To Io2 Over Vj range Voi 3 3 V 0 60 A
19. ed at the time of order acknowledgment Tl warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty Except where mandated by government requirements testing of all parameters of each product is not necessarily performed TI assumes no liability for applications assistance or customer product design Customers are responsible for their products and applications using TI components To minimize the risks associated with customer products and applications customers should provide adequate design and operating safeguards TI does not warrant or represent that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in which TI products or services are used Information published by TI regarding third party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in TI data books or data sheets is permissible only if re
20. en defined Pb Free RoHS TI s terms Lead Free or Pb Free mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances including the requirement that lead not exceed 0 1 by weight in homogeneous materials Where designed to be soldered at high temperatures TI Pb Free products are suitable for use in specified lead free processes Green RoHS amp no Sb Br TI defines Green to mean Pb Free ROHS compatible and free of Bromine Br and Antimony Sb based flame retardants Br or Sb do not exceed 0 1 by weight in homogeneous material 3 MSL Peak Temp The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications and peak solder temperature Important Information and Disclaimer The information provided on this page represents TI s knowledge and belief as of the date that it is provided Tl bases its knowledge and belief on information provided by third parties and makes no representation or warranty as to the accuracy of such information Efforts are underway to better integrate information from third parties TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals TI and TI suppliers consider certain information to be proprietary and thus CAS numbers and other limited information may not be available for release
21. mp Vin 48 V 6 4 S E o 2 gt c 2 30 gt Ln Vo vs lo 3 Vo vs lo a a oO ao o 2 oO 0 2 4 6 8 10 12 lo lo A Note A Characteristic data has been developed from actual products tested at 25 C This data is considered typical data for the converter Note B Load current is increased proportionally from both outputs up to the respective maximum value of each output Note C SOA curves represent the conditions at which internal components are at or below the manufacturer s maximum operating temperatures Derating limits apply to modules soldered directly to a 4 in x 4 in double sided PCB with 1 oz copper sip TEXAS INSTRUMENTS For technical support and further information visit http power ti com PTB48502 Dual Output 48 V Input Isolated DC DC Converter for xDSL SLTS218B SEPTEMBER 2003 REVISED NOVEMBER 2004 Specifications Unless otherwise stated Ta 25 C Vr 48 V Cr 0 pF Co 0 pF and Io 50 Io max PTB48502A Characteristic Symbol Conditions Min Typ Max Units Output Power Po Po Vo 3 3 V 33 Ww Vo 1 2 V 15 6 Po total Both outputs 45 W Output Current To Io2 Over Vin range Voi 3 3 V 0 10 A Vo 12V e 130 Io Io Total both outputs 0 21 A Output Voltage Voi Tnlcudes set point line load 32 3 3 3 4 V Voz 40 lt T
22. own COM l For technical support and further information visit http power ti com Calculation of Resistor Adjust Values The value of the adjust resistor is calculated using one of the following equations Use the equation for R to adjust up or R3 to adjust down k Va R Adjust Up Rp AA R kQ R Adj Down Ra T R ka Where V Magitude of the original output voltage V Magnitude of the adjusted voltage R Adjust up constant from Table 1 1 Rn Adjust down constant from Table 1 1 R Internal series resistor from Table 1 1 os Table 1 1 ADJUSTMENT RANGE AND FORMULA PARAMETERS Part No PTB48500 1 A PTB48502A V nom 12V 12V Valmin 0 96 V 0 84 V Va lmax 132V 1 32 V R kQ 1 648 1 196 R kQ 4 624 3 598 R kQ 18 2 13 0 Notes 1 A 0 05 W rated resistor may be used The tolerance should be 1 with a temperature stability of 100 ppm C or better Place the resistor in either the R or R2 location as close to the converter as possible 2 Never connect capacitors to the M2 Adj pin Capacitance added to this pin can affect the stability of the regulated output wy TEXAS INSTRUMENTS Application Notes continued PTB48500 PTB48501 amp PTB48502 Table 1 2 ADJUST RESISTOR VALUES Part No PTB4850xA PTB48502A Adjust V V R1 Ro Ry
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24. s Output Power Po Po Vo 3 3 V 19 8 Ww Vo 1 2 V 8 4 PO total Both outputs 28 W Output Current To Io2 Over Vj range Vo 3 3 V 0 6 1 A Voz 1 2 V 0 70 To Io Total both outputs 0 13 A Output Voltage Voi Inlcudes set point line load 32 3 3 3 4 y Vo2 40 lt Tas 485 C 1 16 12 1 24 Temperature Variation ARegtemp 40 lt T 4 lt 85 C Io Io min Voi 0 5 V Voz 0 8 9 Line Regulation ARegline Over Vj range Vo Voz 1 10 mV Load Regulation ARegioad Over Io range Vo Voz 3 12 mV Cross Regulation ARegcross To min lt Io lt Iomax Io 1 A AVo1 10 mV To min lt Io lt Igmax Io 1 A AVo2 10 Efficiency n To Io2 Iomax 82 Vo Ripple pk pk M 20 MHz bandwidth V 20 50 o Ripple pk pk r z bandwi Vor 50 50 mVpp Transient Response itp 1 Ais load step 50 to 100 Imax 30 ps AVir Vo Vo over undershoot 2 0 Vo Over Current Threshold I trip Vi 36 V ies Bs 16 ar A reset followed by auto recovery 1 j i Output Voltage Adjust Range Vadj Vo only 10 20 Vo Switching Frequency fs Over Vy and Io ranges 500 550 600 kHz Under Voltage Lockout Vion Vy increasing 34 v Vi off Vi decreasing 32 On Off Enable pin 3 Referenced to V1 pin 5 Input High Voltage Vint 43 6 75 2 v Input Low Voltage Vit 0 2 0 8 Input Low Current Tn 1 mA Standby Input Current Ir standby pins 3 amp 5 connected
25. ut voltage rises relatively slowly To ensure the desired power up sequence the EN Out pin of the PTB4850x is directly connected to the active low Enable input of the PTB4851x see Figure 2 1 This allows the PTB4850x to momentarily hold off the outputs from the PTB4851x until the logic level voltages have risen first Figure 2 2 shows the power up wave forms of all four supply voltages from the schematic of Figure 2 1 Figure 2 2 Power Up Sequencing Waveforms Vecio 1 V Div Veore 1 V Div Vrovr 5 V Div Vioyp 5 V Div HORIZ SCALE 10 ms Div Figure 2 1 Example of PTB4850x amp PTB4851x Modules Configured for DSL Applications 48 V RTN o V Input Filter Enable 48 V O Vi EN Out Sync Out Vo Adj Vo ________ _ gt Vecio PTB4850xA vo SV COM a V V L______ Enable Sync In V Adj Vo gt Vicvr PTB4851xA COM Vo gt Vicvr Ki Texas INSTRUMENTS For technical support and further information visit http power ti com K Texas PACKAGE OPTION ADDENDUM INSTRUMENTS www ti com 11 Oct 2005 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead Ball Finish MSL Peak Temp Type Drawing Qty PTB48500AAH ACTIVE DIP M
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FAIRCHILD SLTS218B handbook