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VNH2SP30-E Datasheet(PDF) 22 Page - STMicroelectronics |
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VNH2SP30-E Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 35 page ![]() Application information VNH2SP30-E 22/35 DocID10832 Rev 10 In any case, when a fault is detected, the faulty leg of the bridge is latched off. To turn on the respective output (OUTX) again, the input signal must rise from low to high level. Figure 33. Behavior in fault condition (how a fault can be cleared) Note: In case of the fault condition is not removed, the procedure for unlatching and sending the device into Stby mode is: - Clear the fault in the device (toggle : INA if ENA=0 or INB if ENB=0) - Pull low all inputs, PWM and Diag/EN pins within tDEL. If the Diag/En pins are already low, PWM=0, the fault can be cleared simply toggling the input. The device will enter Stby mode as soon as the fault is cleared. 3.1 Reverse battery protection Three possible solutions can be considered: 1. a Schottky diode D connected to VCC pin 2. an N-channel MOSFET connected to the GND pin (see Figure 32: Typical application circuit for DC to 20 kHz PWM operation short-circuit protection on page 21) 3. a P-channel MOSFET connected to the VCC pin IN A IN B DIAG A EN A DIAG B EN B Iout A outB FAULT A (Internal Signal) FAULT B (Internal Signal) Normal Operation OUT B shorted to V CC t DEL Fault Cleared Stby (*) Normal Operation OUT B shorted to GND t DEL Fault Cleared Normal Operation Device Latched Device Latched Device Unlatched IN A IN B DIAG A EN A DIAG B EN B Iout A outB FAULT A (Internal Signal) FAULT B (Internal Signal) Normal Operation OUT B shorted to V CC t DEL Fault Cleared Stby (*) Normal Operation OUT B shorted to GND t DEL Fault Cleared Normal Operation Device Latched Device Latched Device Unlatched |
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