NATIONAL SEMICONDUCTOR LM150/LM350A/LM350 Manual
Contents
1. Vout 10V Tj 25C 10 100 tk 10k 100k 1M FREQUENCY Hz DS009061 40 Line Transient Response OUTPUT VOLTAGE DEVIATION V INPUT VOLTAGE CHANGE V 1 5 1 TIME us DS009061 43 Ripple Rejection RIPPLE REJECTION dB 0 01 0 1 1 10 OUTPUT CURRENT A DS009061 41 Load Transient Response QUTPUT VOLTAGE LOAD CURRENT A DEVIATION V Your 10V PRELOAD 50 mA j 25 C TIME us DS009061 44 Application Hints In operation the LM150 develops a nominal 1 25V reference voltage Vre between the output and adjustment terminal The reference voltage is impressed across program resistor R1 and since the voltage is constant a constant current l then flows through the output set resistor R2 giving an out put voltage of R2 Vout VREF 1 2 lap R2 LM150 DS009061 7 FIGURE 1 Since the 50 pA current from the adjustment terminal repre sents an error term the LM150 was designed to minimize lapy and make it very constant with line and load changes To do this all quiescent operating current is returned to the output establishing a minimum load current requirement If there is insufficient load on the output the output will rise EXTERNAL CAPACITORS An input bypass capacitor is recommended A 0 1 uF disc or 1 pF solid tantalum on the input is suitable input bypassing2. May 1998 National Semiconductor LM150 LM350A LM350 3 Amp Adjustable Regulators General Description The LM150 series of adjustable 3 terminal positive voltage regulators is capable of supplying in excess of 3A over a 1 2V to 33V output range They are exceptionally easy to use and require only 2 external resistors to set the output voltage Further both line and load regulation are compa rable to discrete designs Also the LM150 is packaged in standard transistor packages which are easily mounted and handled In addition to higher performance than fixed regulators the LM150 series offers full overload protection available only in IC s Included on the chip are current limit thermal overload protection and safe area protection All overload protection circuitry remains fully functional even if the adjustment termi nal is accidentally disconnected Normally no capacitors are needed unless the device is situ ated more than 6 inches from the input filter capacitors in which case an input bypass is needed An output capacitor can be added to improve transient response while bypass ing the adjustment pin will increase the regulator s ripple re jection Besides replacing fixed regulators or discrete designs the LM150 is useful in a wide variety of other applications Since the regulator is floating and sees only the input to output differential voltage supplies of several hundred volts can be regulated as long as the ma
3. for almost all applications The device is more sensitive to the absence of input bypassing when adjustment or output capacitors are used but the above values will eliminate the possibility of problems The adjustment terminal can be bypassed to ground on the LM150 to improve ripple rejection This bypass capacitor prevents ripple from being amplified as the output voltage is increased With a 10 uF bypass capacitor 86 dB ripple rejec tion is obtainable at any output level Increases over 10 uF do not appreciably improve the ripple rejection at frequen cies above 120 Hz If the bypass capacitor is used it is sometimes necessary to include protection diodes to prevent the capacitor from discharging through internal low current paths and damaging the device In general the best type of capacitors to use is solid tanta lum Solid tantalum capacitors have low impedance even at high frequencies Depending upon capacitor construction it takes about 25 uF in aluminum electrolytic to equal 1 pF solid tantalum at high frequencies Ceramic capacitors are also good at high frequencies but some types have a large decrease in capacitance at frequencies around 0 5 MHz For this reason 0 01 uF disc may seem to work better than a 0 1 LF disc as a bypass Although the LM150 is stable with no output capacitors like any feedback circuit certain values of external capacitance can cause excessive ringing This occurs with values be tween 500 pF and 500
4. 0 pF A 1 uF solid tantalum or 25 uF aluminum electrolytic on the output swamps this effect and insures stability LOAD REGULATION The LM150 is capable of providing extremely good load regulation but a few precautions are needed to obtain maxi mum performance The current set resistor connected be tween the adjustment terminal and the output terminal usu ally 2400 should be tied directly to the output case of the regulator rather than near the load This eliminates line drops from appearing effectively in series with the reference and degrading regulation For example a 15V regulator with 0 050 resistance between the regulator and load will have a load regulation due to line resistance of 0 050 x lour If the set resistor is connected near the load the effective line re sistance will be 0 050 1 R2 R1 or in this case 11 5 times worse Figure 2 shows the effect of resistance between the regula tor and 2400 set resistor LM150 DS009061 8 FIGURE 2 Regulator with Line Resistance in Output Lead With the TO 3 package it is easy to minimize the resistance from the case to the set resistor by using two separate leads to the case The ground of R2 can be returned near the ground of the load to provide remote ground sensing and im prove load regulation PROTECTION DIODES When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharg
5. 16 76 17 02 g 0 880 0 915 22 35 23 24 g 0 760 0 775 19 30 19 69 1 1777 1 197 lieu 29 90 30 40 l l 2X 5 05 0 038 0 043 2X o 97 1 09 UNCONTROLLED 0 210 0 220 i 0 168 0 178 ATA 210 0 168 0 0 030 0 085 5 33 5 59 2X R 4 27 4 52 0 76 MAX 2 16 X 0 425 0 435 SEATING PLANE ke 8 10 80 11 05 2 Lead TO 3 Metal Can Package K Mil Aero Product Order Number LM150K 883 NS Package Number K02C 13 www national com LM150 LM350A LM350 3 Amp Adjustable Regulators Physical Dimensions inches millimeters unless otherwise noted Continued 0 240 0 260 0 330 0 350 6 10 6 60 8 38 8 89 0 100 0 120 0 149 0 153 2 54 3 05 3 78 3 89 0 090 0 110 onn 2 29 2 79 0 400 0 005 0 38 19 167595 0 190 0 210 4 83 5 33 0 048 0 055 1 22 1 40 TYP 0 130 0 160 3 30 4 06 PIN 1 ID 0 027 0 037 0 69 0 94 TYP ae m 2 325 0 555 y 0 015 saj 03820551 13 34 14 10 0 175 0 185 4 45 4 70 09 69 0 010 0 25 0 105 ois 2 67 5558 SEATING PLANE TAPERED SIDES 19 TO3B REV L 3 Lead Molded TO 220 T Order Number LM350AT or LM350T NS Package Number TO3B 1 005 1 035 25 53 26 29 0 048 0 052 1 22 1 32 LIFE SUPPORT POLICY NATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI CON
6. DUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or sys 2 A critical component is any component of a life support tems which a are intended for surgical implant into the body or b support or sustain life and whose fail ure to perform when properly used in accordance device or system whose failure to perform can be rea sonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Asia Pacific Customer Japan Ltd Americas Fax 49 0 1 80 530 85 86 Response Group Tel 81 3 5639 7560 Tel 1 800 272 9959 Email europe support nsc com Tel 65 2544466 Fax 81 3 5639 7507 Fax 65 2504466 Email sea support nsc com Fax 1 800 737 7018 Email support nsc com Deutsch Tel 49 0 1 80 530 85 85 English Tel 49 0 1 80 532 78 32 Francais Tel 49 0 1 80 532 93 58 0 www national com Italiano Tel 49 0 1 80 534 16 80 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications
7. Limit Vin Vour lt 10V 3 0 4 5 A Ripple Rejection Ratio Vour 10V f 120 Hz Cap 0 pF p 6 a Vour 10V f 120 Hz Caps 10 UF 66 86 Long Term Stability Ty 125 C 1000 hrs le Rea ee Ye Thermal Resistance Junction K Package 1 2 1 5 CAN Thermal Resistance Junction K Package 35 CAN Electrical Characteristics Specifications with standard type face are for T 25 C and those with boldface type apply over full Operating Tempera ture Range Unless otherwise specified Vin Vour 5V and lour 10 mA Note 2 Parameter Conditions LM350 Units Min Typ Max Min Typ Max Reference Voltage Flours t0mA T 250 se pae fase V 3V lt Vin Youn 35V 1 270 V 10 mA lt lour 3A P lt 30W Line Regulation 3V lt Vin Vour lt 35V Note 3 lo o05 0 01 o005 0 03 YN Load Regulation 10 MA lt lour lt 3A Note 3 ie RO Gerd SOU OSI os os fas Thermal Regulation Rama ez oo pone oos uw 10 50 100 pa Adjustment Pin Current 10 mA lt lour 3A 3V x Vin Vour LA Change 35 www national com 2 Electrical Characteristics continued Specifications with standard type face are for T 25 C and those with boldface type apply over full Operating Tempera ture Range Unless otherwise specified Vin Vou 5V and lour 10 mA Note 2 Tye War uis Tio sr Minimum Load Current Vin Vout 35V Current Li
8. ations of the LM150K Typical Performance Characteristics Load Regulation Current Limit Adjustment Current B 65 ES z q 60 z z 2 E 4 z 55 Z g E ul 2 50 E E E 5 5 ul 45 eo a gt 2 5 S Bou a a z o 35 0 30 75 25 25 75 125 D 5 10 15 20 25 30 35 75 25 25 75 125 TEMPERATURE C INPUT OUTPUT DIFFERENTIAL V TEMPERATURE C DS009061 33 DS009061 34 DS009061 35 Dropout Voltage Temperature Stability Minimum Operating Current a AV s OUT 100 mV z 25 S E i ui 2 z wu 2 5 tr E i ES 6 z 3 E S 15 9 z ul e 2 c a F i E ES e 8 a z 0 5 75 75 25 25 75 125 TEMPERATURE C TEMPERATURE C INPUT OUTPUT DIFFERENTIAL V DS009061 36 DS009061 37 DS009061 38 3 www national com Typical Performance Characteristics Continued Ripple Rejection Cap 0 1 120 He 100 88 ta 5 60 e ul a ul c 40 4 Li z Vin g L uT 0 0 5 t Vout 5V 500 mA 25 C 10 15 20 25 OUTPUT VOLTAGE V 30 35 DS009061 39 Output Impedance 101 100 OUTPUT IMPEDANCE 0 3 www national com 100 1k 10k 100k FREQUENCY Hz DS009061 42 Ripple Rejection 100 RIPPLE REJECTION dB
9. continued 5V Logic Regulator with 0 to 30V Regulator Electronic Shutdown LM150 LM150 Vin 7V 35V TTL DS009061 19 Min output 1 2V 10V DS009061 20 Full output current not available at high input output voltages 5A Constant Voltage Constant Current Regulator MJ4502 CURRENT ADJUST OUTPUT 1 2 y DS009061 21 tSolid tantalum Lights in constant current mode 9 www national com Typical Applications Continued 12V Battery Charger Vin gt 18V O Q1 2N2905 Adjustable Current Regulator LM150 R1 IOUT 0 TO 3A LM117 Ta V 5V TO 10V DS009061 23 Precision Current Limiter LM150 VREF V VREF IN lout RI DS009061 24 0 4 lt R4 1200 www national com TO 12V BATTERY DS009061 22 1 2V 20V Regulator with Minimum Program Current LM150 DS009061 25 Minimum output current 4 mA 3A Current Regulator LM150 DS009061 26 10 Typical Applications continued Tracking Preregulator R2 720 R1 240 LM150 VIN DS009061 27 Adjusting Multiple On Card Regulators with Single Control LM150 DS009061 28 tMinimum load 10 mA All outputs within 100 mV AC Voltage Regulator Simple 12V Battery Charger LM350 LM350 Rg VIN 24 Vp p 1000 LF DS009061 30 R2 Rs sets output impedance of charger Zout Rs a LM350 DS009061 48 DS009061 29 Use of Rg allows low charging
10. ing through low current points into the regulator Most 10 uF capacitors have low enough internal series resistance to deliver 20A spikes when shorted Although the surge is short there is enough energy to damage parts of the IC When an output capacitor is connected to a regulator and the input is shorted the output capacitor will discharge into the output of the regulator The discharge current depends on the value of the capacitor the output voltage of the regu lator and the rate of decrease of Vin In the LM150 this dis charge path is through a large junction that is able to sustain 25A surge with no problem This is not true of other types of positive regulators For output capacitors of 25 pF or less there is no need to use diodes The bypass capacitor on the adjustment terminal can dis charge through a low current junction Discharge occurs when either the input or output is shorted Internal to the LM150 is a 509 resistor which limits the peak discharge cur rent No protection is needed for output voltages of 25V or www national com Application Hints continued less and 10 uF capacitance Figure 3 shows an LM150 with protection diodes included for use with outputs greater than 25V and high values of output capacitance DS009061 9 D1 protects against C1 D2 protects against C2 R2 Vout 1 25V lapyR2 FIGURE 3 Regulator with Protection Diodes Schematic Diagram 500 DS009061 10 www nati
11. mit Vin Vour lt 10V Vin Vour 30V RMS Output Noise of 10 Hz lt f lt 10 kHz Vout Ripple Rejection Ratio Vout 10V f 120 Hz Cap 0 pF Long Term Stability Ty 125 C 1000 hrs Thermal Resistance Junction K Package to Case T Package Thermal Resistance Junction K Package to Ambient No Heat Sink T Package 4 5 1 C W C W C W C W oo w o eo o 5 o o 5 aS Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is in tended to be functional but do not guarantee specific performance limits For guaranteed specifications and test conditions see the Electrical Characteristics Note 2 These specifications are applicable for power dissipations up to 30W for the TO 3 K package and 25W for the TO 220 T package Power dissipation is guaranteed at these values up to 15V input output differential Above 15V differential power dissipation will be limited by internal protection circuitry All limits i e the numbers in the Min and Max columns are guaranteed to National s AOQL Average Outgoing Quality Level Note 3 Regulation is measured at a constant junction temperature using pulse testing with a low duty cycle Changes in output voltage due to heating effects are covered under the specifications for thermal regulation Note 4 Refer to RETS150K drawing for military specific
12. onal com 6 Typical Applications 1 2V 25V Adjustable Regulator LM150 Vin 2 28V Vouttt cat 1uF DS009061 1 Full output current not available at high input output voltages tOptional improves transient response Output capacitors in the range of 1 uF to 1000 uF of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients Needed if device is more than 6 inches from filter capacitors R2 TTVouT 1 25V 1 m lapy R2 Note Usually R1 240Q for LM150 and R1 1202 for LM350 Precision Power Regulator with Low Temperature Coefficient LM350 Vgur 24V OUTPUT ADJUST DS009061 13 Adjust for 3 75V across R1 Slow Turn ON 15V Regulator LM150 VOUT v IN 15V 1N4002 DS009061 14 Adjustable Regulator with Improved Ripple Rejection LM150 Vin D1 1N4002 1uFt DS009061 15 tSolid tantalum Discharges C1 if output is shorted to ground High Stability 10V Regulator LM150 LM129A DS009061 16 www national com Typical Applications Continued Digitally Selected Outputs LM150 Regulator and Voltage Reference LM150 Vout VIN Vout 15V R1 240 240 R2 1 4k VREF 6 95V D1 LM129 DS009061 3 INPUTS DS009061 17 Sets maximum VouT 10A Regulator LM350 Vout 22 uF DS009061 18 Minimum load current 50 mA www national com 8 Typical Applications
13. rates with fully charged battery 1000 UF is recommended to filter out any input transients 11 www national com Typical Applications Continued Adjustable 10A Regulator Temperature Controller LM350 VIN VoyT 4 5V TO 25V HEATER 100k GAIN DS009061 11 Light Controller LM350 DS009061 31 Current Limited 6V Charger LM350 DS009061 12 1000 uF 2N2222 DS009061 32 Sets peak current 2A for 0 30 1000 UF is recommended to filter out any input transients 6A Regulator VIN OUTPUT DS009061 2 www national com 12 Physical Dimensions inches millimeters unless otherwise noted 0 325 0 352 0 420 0 500 8 26 8 94 10 67 12 70 0 060 0 070 1 52 1 78 0 980 1 020 24 89 25 91 0 151 0 161 2X Br 8424 08 0 495 0 510 12 57 12 95 0 660 0 670 16 76 17 02 0 880 0 915 2 22 35 23 24 g 0 760 0 775 X 19 30 19 69 1 177 1 197 29 90 30 40 0 038 0 043 2X o o7 1 09 UNCONTROLLED 0 210 0 220 QURE 178 60025 0 116 ere IE 4 27 4 52 5 33 5 59 0 64 MAX 2 95 MAX 0 425 0 435 SEATING PLANE KOUA UNE E 10 80 11 05 2 Lead TO 3 Metal Can Package K Order Number LM150K STEEL or LM350K STEEL NS Package Number K02A 0 420 0 500 0 285 0 305 10 67 12 70 7 24 7 75 0 980 1 020 a 2X g 0 151 0 161 24 89 25 91 0 060 0 070 3 84 4 09 1 52 1 78 R 0 495 0 510 12 57 12 95 0 660 0 670
14. t regulators m Battery chargers TO 220 Plastic Package Vout gt VOUT ko OO ADJ DS009061 5 Front View Order Number LM350AT or LM350T See NS Package Number TO3B www national com siojejnbay ejqeisn py dwy OSSIN1 VOSEINT 0SLINT Absolute Maximum Ratings Note 1 Lead Temperature e Metal Package Soldering 10 sec 300 C If Military Aerospace specified devices are required Plastic Package Soldering 4 sec 260 C please contact the National Semiconductor Sales Office pe ELE dora ESD Tolerance TBD Distributors for availability and specifications m ting T nid Note 4 perating Temperature Range P Dissipati R II Limited LM150 55 C lt T 150 C I EO in Differential e oe EA eS Lid ut Outpu i i LM350 O C lt Ty lt 125 C Storage Temperature 65 C to 150 C ce Electrical Characteristics Specifications with standard type face are for T 25 C and those with boldface type apply over full Operating Tempera ture Range Unless otherwise specified Vin Vour 5V and lour 10 mA Note 2 Parameter Conditions LM150 Units Wi Tw Wax Reference Voltage 3V lt Vin Vout 35V V Line Regulation 3V lt Vin Vour 35V Note 3 000 001 YN 90 005 N Load Regulation 10 mA lt lour 3A Note 3 rn ea ee 96 o3 1 Adjustment Pin Current Grange 10 mA four 5 A VE Vn Vou S38V 02 5 m Minimum Load Current Vin Vour 35V 35 5 mA Current
15. ximum input to output differential is not exceeded i e avoid short circuiting the output By connecting a fixed resistor between the adjustment pin and output the LM150 can be used as a precision current Connection Diagrams TO 3 STEEL Metal Can Package ADJUSTMENT VIN DS009061 4 Case is Output Bottom View Order Number LM150K STEEL or LM350K STEEL See NS Package Number K02A Order Number LM150K 883 See NS Package Number K02C 1999 National Semiconductor Corporation DS009061 regulator Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1 2V where most loads draw little current The part numbers in the LM150 series which have a K suffix are packaged in a standard Steel TO 3 package while those with a T suffix are packaged in a TO 220 plastic package The LM150 is rated for 55 C lt T lt 150 C while the LM350A is rated for 40 C lt T lt 4125 C and the LM350 is rated for 0 C lt T 125 C Features Adjustable output down to 1 2V Guaranteed 3A output current Guaranteed thermal regulation Output is short circuit protected Current limit constant with temperature P Product Enhancement tested 86 dB ripple rejection Guaranteed 196 output voltage tolerance LM350A Guaranteed max 0 01 V line regulation LM350A Guaranteed max 0 3 load regulation LM350A Applications m Adjustable power supplies m Constant curren
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NATIONAL SEMICONDUCTOR LM150/LM350A/LM350 Manual