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ST L6375 0.5A INDUSTRIAL INTELLIGENT POWER SWITCH handbook

1. ON At this point in time two con 6 12 TTA L6375 ditions may occur A the overload is still present and then the output power MOS is again driven in linear mode limiting the output current to Isc for another Ton starting a new cycle or B the overload condition is removed and the output power MOS is no longer driven in linear mode All these occurrences are presented on the DIAG2 pin see fig 2 We call this unique feature Non Dissipative Short Circuit Protection and itensures a very safe operation even in permanent overload conditions Note that choosing the most appropriate value for the Ton interval i e the value of the Cdon capacitor a delay the Ton itself will prevent that a misleading Short Circuit information is presented on the DIAG2 output when driving capacitive loads that acts like short circuit in the very beginning or Incandescent Lamp a cold filament has a very low resistive value The Non Dissipative Short Circuit Pro tection can be disabled keeping Ton 0 but with the output current still limited to Isc and Diagnostic dis abled simply shorting to ground the the ON DELAY pin Figure 2 Non Dissipative Short Circuit Protection Operation OUTPUT CURRENT t lt ton 1 1 ee Short Circuit l i LI L torr ton Short Circuit DIAG active low D94IN105 DIAGNOSTIC LOGIC The operating conditions of the device are permanently monitored and the following occurrences are signalled via
2. the DIAG1 DIAG2 open drain output pins see diagnostic Truth Table Short Circuit versus ground Short Circuit versus Vs Under Voltage UV Over Temperature OVT Open Load if the output current is less than 3mA typical value DEMAGNETIZATION OF INDUCTIVE LOADS An internal zener diode limiting the voltage across the Power MOS to between 50 and 60V Vei provides safe and fast demagnetization of inductive loads without external clamping devices The maximum energy that can be absorbed from an inductive load is specified as 200mJ at Tj 85 C ky 7 12 L6375 DIAGNOSTIC TRUTH TABLE Diagnostic Conditions DIAG1 DIAG2 Normal Operation Open Load Condition lo lt lola Short to Vs Short Circuit to Ground lo Isc pin ON DELAY grounded Output DMOS Open Overtemperature Sumplay Undervoltage Vs lt Vstn2 Figure 3 Inductive Load Equivalent Circuit D95IN215 Figure 4 External Demagnetisation Circuit versus ground o Vs Jes CURRENT LIMIT DRIVER m SHORT CIRCUIT CONTROL Vz lt Vg min Vs max D94IN112 3 8 12 L6375 Figure 5 External Demagnetisation Circuit versus W o Vs Jos CURRENT LIMIT DRIVER SHORT CIRCUIT CONTROL Vs max lt Vz lt Vg min D94IN111A Figure 6 Application Schematic Transil ST1 5KExx IEC801 5 UNDER 2 2uF electrolytic VOLTAGE L DRIVER NON DISSIPATIVE CURRENT T SHORT CIRCUIT LIMIT
3. ATION 10nF ceramic IEC801 4 IEC801 4 OPEN LOAD DETECTION EN OUTSTATUS L a DIAGNOSTIG THERMAL PROTECTION O OUTPUT STATUS g 9 12 L6375 lt x lt O56 a zo az r lt a oo LL vt N e N SO20MEC l 10 12 vr c m Tre Tu OUTLINE AND MECHANICAL DATA L6375 11 12 L6375 Information furnished is believed to be accurate and reliable However STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics Specifications mentioned in this publication are subject to change without notice This publication supersedes and replaces all information previously supplied STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics The ST logo is a registered trademark of STMicroelectronics 1999 STMicroelectronics All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia Brazil China Finland France Germany Hong Kong India Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom U S A http www st com 12 12 ky
4. O 0 163750 0 0 kJ e L6375 0 5A INDUSTRIAL INTELLIGENT POWER SWITCH PRELIMINARY DATA MULTIPOWER BCD TECHNOLOGY e m 0 5A OUTPUT CURRENT m 8V TO 35V SUPPLY VOLTAGE RANGE m NON DISSIPATIVE SHORT CIRCUIT PROTECTION m THERMAL SHUTDOWN m OPEN GROUND PROTECTION m NEGATIVE VOLTAGE CLAMPING FOR FAST DEMAGNETIZATION m UNDERVOLTAGE LOCKOUT WITH HYSTERESIS m OPEN LOAD DETECTION m TWO DIAGNOSTIC OUTPUTS m OUTPUT STATUS LED DRIVER m IMMUNITY AGAINST BURST TRANSIENT IEC 801 4 see application schematic m ESD PROTECTION HUMAN BODY MODEL 2KV BLOCK DIAGRAM 020 MINIDIP ORDERING NUMBERS L6375D L6375 DESCRIPTION The L6375 is a monolithic fully protected full diag nostic 0 5A Intelligent Power Switch it is designed to drive any kind of R L C load with controlled output voltage slew rate and non dissipative short circuit protection An internal Clamping Diode enables the fast demagnetization of inductive loads Diagnostic for CPU feedback and extensive use of electrical pro tections make this device extremely rugged and spe cially suitable for industrial automation applications UNDER CHARGE VOLTAGE PUMP DRIVER NON DISSIPATIVE u CURRENT LIMITATION SHORT CIRCUIT OPEN LOAD DETECTION OUTSTATUS m E DIAGNOSTIC THERMAL PROTECTION OUTPUT STATUS D951N208B February 2000 1 12 This is preliminary information on a new product now in development or undergoing evaluation Details a
5. V 2 3 4 12 L6375 ELECTRICAL CHARACTERISTCS Continued mem mem me m 5 6 Active Output Status Driver Vs Vos los 2mA Drop Voltage Tamb 0 to 85 C 5 6 Output Status Driver Leakage Vout lt Voth2 Vos OV yp 5 Current Vs 18 to 35V 40 50 20 1 Vagl 5 6 Diagnostic Drop Voltage D1 D2 L Igiag 0 5mA D1 D2 L lgiag 3mA 250 lagik 5 6 Diagnostic Leakage Current D1 D2 H 0 lt Vag lt Vs Vs 15 6 to 35V Over Temperature Upper 1 Threshold Over Temperature Hysteresis AC OPERATION pin numbering referred to Minidip package 2 Rise or Fall Time Vs 24V Rj 70Q R to ground 20 us 3 V 25 uA mV mV Lis Delay Time Vs 24V RI 70Q Rp to ground us Slew Rate Rise and Fall Edge 50pF lt Cpon lt 2nF V us On time during Short Circuit us pF Condition Off time during Short Circuit us pF Condition fm Maximum Operating Freguency KHz prom peer S T T Reverse Recovery Time If 625mA di dt 25A us Forward Recovery Time 4 5 12 L6375 Figure 1 Switching Waveforms t D941N127A INPUT SECTION An Single ended Input TTL CMOS compatible with wide voltage range and high noise immunity thanks to a built in hysteresis is available OVER TEMPERATURE PROTECTION OVT An on chip Over Temperature Protection provides an excellent protection of the device in extreme conditions Whenever the temperatur
6. e measured on a central portion of the chip exceeds Tmax 150 C typical value the device is shut off and the DIAG2 output goes LOW Normal operation is resumed as the chip temperature normally after few seconds falls below Tmax Thys 130 C typical value The hysteresis avoid thats an inter mittent behaviour take place UNDER VOLTAGE PROTECTION UV The supply voltage is expected to range from 8 to 35 V In this range the device operates correctly To avoid any misfunctioning the supply voltage is continuously monitored to provide an under voltage protection As Vs falls below Vsth Vshys typically 7 5 V see fig 1 the output power MOS is switched off and DIAG1 and DIAG2 see Diagnostic truth table Normal operation is resumed as soon as Vs exceeds Vsth The hysteretic behaviour prevents intermittent operation at low supply voltage OVER CURRENT OPERATION In order to implement a short circuit protection the output power MOS is driven in linear mode to limit the output current to the Isc 1 1A typical value This condition current limited to the Isc value lasts for a Ton time interval that can be set by means of a capacitor Cdon connected to the ON DELAY pin according to the following for mula Ton 1 28 msec pF for 50pF lt Cdon lt 2nF After the Ton interval has expired the output power MOS is switched off for the Toff time interval with Toff 64 Ton When also the Toff interval has expired the out put power MOS is switched
7. esistance Junction to Case Max Thermal Resistance Junction to Ambient ky 3 12 L6375 ELECTRICAL CHARACTERISTCS Vs 24V Tj 25 to 125 C unless otherwise specified pin numbering referred to Minidip package Parameter Test Condition Supply Voltage for Valid Diagnostic Idiag 20 5mA Vdiag 1 5V Operative Supply Voltage Undervoltage Threshold 1 See fig 2 Undervoltage Threshold 2 See fig 2 Under Voltage Hysteresis Quiescent Current Output Open Quiescent Current Output On go e 00 o E 3 lt Input High Level Voltage Vs lt 18V Input High Level Voltage Vs 18V Input Bias Current Idch 5 Delay Capacitor Charging Current Output Voltage Drop Output Leakage Current RUNE Output Low State Voltage Internal Voltage Clamp Vs Vout Vi 7 to 15V ON DELAY pin shorted to Ground lout 500mA Tj Tj 125 C lou 625mA Tj Tj 125 C 25 C 25 C Vi LOW Vout 0 HIGH pin floating lo 200mA single pulsed 300us Short Circuit Output Current Vs 810 35V R 20 2 5 1 6 280 T gt mV gt Open Load Detection Current Vi Vin Tamb Oto 85 C 5 6 Output Status Threshold 1 Voltage See fig 1 Voth2 5 6 Output Status Threshold 2 See fig 1 4 Voltage Vohys 5 6 Output Status Threshold See fig 1 300 Hysteresis Output Status Source Current Vout gt Votht Vos 2 5
8. re subject to change without notice L6375 PIN FUNCTION Pin numbering referred to Minidip package Description Ground High side output Controlled output with current limitation Vs Supply voltage input Range with under voltage monitoring OUTPUT STATUS Led driver to signal the status of the output pin The pin is active sources current when the output is considered high See fig 1 DIAG1 Diagnostic 1 output This open drain reports the IC working conditions See Diagnostic truth table DIAG2 Diagnostic 2 output This open drain reports the IC working conditions See Diagnostic truth table IN Comparator non inverting input ON DELAY Delay setting for overcurrent diagnostic PIN CONNECTION Top view GND ON DELAY OUTPUT ze INPUT Vs DIAG1 OUTPUT STATUS DIAG2 N C GND N C OUTPUT N C Vs N C N C N C OUTPUT STATUS k N C ON DELAY N C INPUT N C DIAG1 DIAG2 N C N C N C O ON O Ga A CO PD 2 12 ky L6375 ABSOLUTE MAXIMUM RATINGS Pin numbering referred to Minidip package ws or o e s DX 3 mene 9 Vs Vout 3 vs 2 Supply to Output Differential voltage Externally Forced Voltage Externally Forced Current Output Current see also Isc External voltage 0 3 to 40 Externally forced current Er mem R E see Overtemperature Protection Fe p 11105 C THERMAL DATA Thermal R

ST L6375 0.5A INDUSTRIAL INTELLIGENT POWER SWITCH handbook

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