L6375 0.5A INDUSTRIAL INTELLIGENT POWER SWITCH PRELIMINARY DATA ■ 0.5A OUTPUT CURRENT ■ 8V TO 35V SUPPLY VOLTAGE RANGE ■ NON DISSIPATIVE SHORT CIRCUIT PROTECTION ■ THERMAL SHUTDOWN ■ OPEN GROUND PROTECTION ■ NEGATIVE VOLTAGE CLAMPING FOR FAST DEMAGNETIZATION ■ UNDERVOLTAGE LOCKOUT WITH HYSTERESIS ■ OPEN LOAD DETECTION DESCRIPTION ■ TWO DIAGNOSTIC OUTPUTS ■ OUTPUT STATUS LED DRIVER ■ IMMUNITY AGAINST BURST TRANSIENT (IEC 801-4), see application schematic. ■ ESD PROTECTION (HUMAN BODY MODEL ±2KV) The L6375 is a monolithic fully protected, full diagnostic 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 protections make this device extremely rugged and specially suitable for industrial automation applications. MULTIPOWER BCD TECHNOLOGY SO20 MINIDIP ORDERING NUMBERS: L6375D L6375 BLOCK DIAGRAM VS UNDER VOLTAGE IN+ INPUT IN- CHARGE PUMP + DRIVER 1.4V OUT NON DISSIPATIVE SHORT CIRCUIT Con CURRENT LIMITATION OPEN LOAD DETECTION OSC OUTSTATUS DIAG1 DIAGNOSTIC THERMAL PROTECTION DIAG2 3mA OUTPUT STATUS D95IN208B February 2000 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change with out notice. 1/12 L6375 PIN FUNCTION (Pin numbering referred to Minidip package) N° Pin 1 GND Ground 2 OUT High side output. Controlled output with current limitation 3 Vs 4 Description 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) 5 DIAG1 Diagnostic 1 output. This open drain reports the IC working conditions. (See Diagnostic truth table) 6 DIAG2 Diagnostic 2 output. This open drain reports the IC working conditions. (See Diagnostic truth table) 7 IN+ 8 ON DELAY Comparator non inverting input Delay setting for overcurrent diagnostic PIN CONNECTION (Top view) ON DELAY 7 INPUT + 3 6 DIAG1 4 5 DIAG2 1 OUTPUT 2 VS OUTPUT STATUS MINIDIP N.C. 1 20 N.C. GND 2 19 ON DELAY N.C. 3 18 N.C. OUTPUT 4 17 INPUT+ N.C. 5 16 N.C. VS 6 15 DIAG1 N.C. 7 14 DIAG2 N.C. 8 13 N.C. N.C. 9 12 N.C. 10 11 N.C. OUTPUT STATUS 2/12 8 GND SO20 L6375 ABSOLUTE MAXIMUM RATINGS (Pin numbering referred to Minidip package) Symbol Pin Vs 3 Vs 3 Vs -Vout 3 vs 2 Vod 5 Externally Forced Voltage -0.3 to 7 V Iod 5 Externally Forced Current ±1 mA Iout 2 Output Current (see also Isc) internally limited Vout 2 Output Voltage internally limited Power Dissipation internally limited Ptot Parameter Value Unit Supply Voltage (tw < 10 ms) 50 V Supply Voltage (DC) 40 V Supply to Output Differential voltage internally limited V Vdiag 5.6 External voltage -0.3 to 40 V Idiag 5.6 Externally forced current -10 to 10 mA Ii 7 Input Current 20 mA Vi 7 Input Voltage -10 to Vs +0.3 V Top Ambient temperature, operating range -25 to 85 °C Tj Junction temperature, operating range (see Overtemperature Protection) -25 to 125 °C Storage temperature -55 to 150 °C 200 mJ Tstg EI Energy Induct. Load TJ = 85°C THERMAL DATA Symbol Parameter Minidip R th j-case Thermal Resistance Junction to Case Max. Rth j-amb Thermal Resistance Junction to Ambient Max. SO20 Unit °C/W 100 90 °C/W 3/12 L6375 ELECTRICAL CHARACTERISTCS (VS = 24V; Tj = –25 to +125°C, unless otherwise specified; pin numbering referred to Minidip package) Symbol Pin Parameter Test Condition Vsmin 3 Supply Voltage for Valid Diagnostic Vs 3 Operative Supply Voltage Vsth1 3 Undervoltage Threshold 1 Vsth2 3 Undervoltage Threshold 2 Vshys 3 Under Voltage Hysteresis Iq 3 Quiescent Current Output Open 800 µA Iqo 3 Quiescent Current Output On 1.6 mA Vith 7 Input Threshold Voltage 0.8 Viths 7 Input Threshold Hysteresis Vil 7 Input Low Level Voltage Vih 7 Input High Level Voltage Vih 7 Iib Idch Idiag = >0.5mA;Vdiag = 1.5V; Min. Typ. 4 Max. Unit 35 V 8 24 35 V (See fig. 2) 7 7.5 8 V (See fig. 2) 6.5 7 7.5 V 300 500 700 mV 2 V 50 400 mV -7 0.8 V Vs< 18V 2 Vs -3 V Input High Level Voltage Vs> 18V 2 15 V 7 Input Bias Current Vi = -7 to 15V -250 250 µA 5 Delay Capacitor Charging Current ON DELAY pin shorted to Ground 2.5 Output Voltage Drop Iout = 500mA Tj = 25°C 200 320 250 400 Vdon 1.3 µA 280 440 350 550 mV mV mV mV 100 µA 0.8 1.5 V 48 53 58 V 0.75 1.1 1.5 A 1 3 6 mA Tj = 125°C Iout = 625mA Tj = 25°C Tj = 125°C Iolk 2 Output Leakage Current Vi = LOW; Vout=0 Vol 2 Output Low State Voltage Vi = HIGH; pin floating Vcl 2 Internal Voltage Clamp (Vs-Vout) Io = 200mA single pulsed =300µs Isc 2 Short Circuit Output Current Vs = 8 to 35V; Rl = 2Ω; Iold 2 Open Load Detection Current Vi = Vih; Tamb = 0 to +85°C Voth1 5.6 Output Status Threshold 1 Voltage (See fig. 1) 4.5 5 5.5 V Voth2 5.6 Output Status Threshold 2 Voltage (See fig. 1) 4 4.5 5 V Vohys 5.6 Output Status Threshold Hysteresis (See fig. 1) 300 500 700 mV Iosd 5.6 Output Status Source Current Vout > Voth1 ; Vos = 2.5V 4 mA 4/12 2 L6375 ELECTRICAL CHARACTERISTCS (Continued) Symbol Pin Parameter Test Condition Vosd 5.6 Active Output Status Driver Drop Voltage Vs – Vos ; Ios = 2mA Tamb = 0 to +85°C Ioslk 5.6 Output Status Driver Leakage Current VS = 18 to 35V Min. Typ. Max. Unit 1.5 3 V 25 µA Vout < Voth2 ; Vos = 0V Vdgl 5.6 Diagnostic Drop Voltage D1 / D2 = L ; Idiag = 0.5mA D1 / D2 = L ; Idiag = 3mA Idglk 5.6 Diagnostic Leakage Current D1 / D2 = H ; 0 < Vdg < Vs VS = 15.6 to 35V 40 250 mV mV 5 µA Tmax Over Temperature Upper Threshold 150 °C Thys Over Temperature Hysteresis 20 °C AC OPERATION (pin numbering referred to Minidip package) tr -t f 2 Rise or Fall Time Vs = 24V; R l =70Ω Rl to ground 20 µs td 2 Delay Time Vs = 24V; Rl =70Ω R l to ground 5 µs dV/dt 2 Slew Rate (Rise and Fall Edge) 50pF < CDON < 2nF tON 8 On time during Short Circuit Condition 128 µs/pF tOFF 8 Off time during Short Circuit Condition 64 µs/pF Maximum Operating Frequency 25 KHz fmax 7 1 15 V/µs SOURCE DRAIN NDMOS DIODE Vf Forward On Voltage @ Ifsd = 625mA IfD Forward Peak Voltage t = 10ms; d = 20% trr Reverse Recovery Time If = 625mA di/dt = 25A/µs tfr Forward Recovery Time 1 1.5 V 2 A 200 ns 50 ns 5/12 L6375 Figure 1. Switching Waveforms Vin 50% 50% td t td Vout 90% 90% 50% 50% 10% 10% tr tf D94IN127A t 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 temperature - 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 intermittent 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 formula: Ton = 1.28 msec/pF for 50pF<Cdon< 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 ON. At this point in time two con6/12 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 it ensures 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 Protection can be disabled (keeping Ton = 0 but with the output current still limited to Isc, and Diagnostic disabled)simply shorting to ground the the ON DELAY pin. Figure 2. Non Dissipative Short Circuit Protection Operation OUTPUT CURRENT Isc Iout t<tON DIAG (active low) Short Circuit tON tOFF tON Time tOFF Short Circuit D94IN105 Time DIAGNOSTIC LOGIC The operating conditions of the device are permanently monitored and the following occurrences are signalled via 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 (Vcl), 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) 7/12 L6375 DIAGNOSTIC TRUTH TABLE Diagnostic Conditions Input Output DIAG1 DIAG2 Normal Operation L H L H H H H H Open Load Condition (Io < Iold) L H L H H L H H Short to V S L H H H L L H H Short Circuit to Ground (IO = ISC) (pin ON-DELAY grounded) H H L H H H H Output DMOS Open L H L L H L H H Overtemperature L H L L H H L L Sumplay Undervoltage (VS < Vsth2) L H L L L L L L Figure 3. Inductive Load Equivalent Circuit +VS IS 50V VS OUTPUT IO L RL D95IN215 Figure 4. External Demagnetisation Circuit (versus ground) VS RS CURRENT LIMIT OVC DRIVER OUT UV SHORT CIRCUIT CONTROL VZ < Vcl (min) - VS (max) 8/12 VZ D94IN112 L6375 Figure 5. External Demagnetisation Circuit (versus VS) VS VS RS CURRENT LIMIT VZ OVC DRIVER OUT UV SHORT CIRCUIT CONTROL VS (max) < VZ < Vcl (min) D94IN111A Figure 6. Application Schematic Transil, ST1,5KExx (IEC801-5) VS UNDER VOLTAGE IN+ INPUT + DRIVER 1.4V OUT NON DISSIPATIVE SHORT CIRCUIT Con 2.2µF, electrolytic CHARGE PUMP CURRENT LIMITATION 10nF, ceramic (IEC801-4, IEC801-4) OPEN LOAD DETECTION OSC OUTSTATUS DIAG1 DIAGNOSTIC THERMAL PROTECTION DIAG2 3mA OUTPUT STATUS 9/12 L6375 mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 2.35 2.65 0.093 0.104 A1 0.1 0.3 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.6 13 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 OUTLINE AND MECHANICAL DATA 0.050 H 10 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 SO20 K 0° (min.)8° (max.) L h x 45° A B e A1 K H D 20 11 E 1 1 0 SO20MEC 10/12 C L6375 mm DIM. MIN. A TYP. inch MAX. MIN. 3.32 TYP. MAX. 0.131 a1 0.51 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 0.020 D E 10.92 7.95 9.75 0.430 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 I 5.08 0.200 L Z 3.18 OUTLINE AND MECHANICAL DATA 3.81 1.52 0.125 0.150 Minidip 0.060 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. N o 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. 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