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LDL112PU33R Datasheet(PDF) 10 Page - STMicroelectronics |
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LDL112PU33R Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 32 page  Application information LDL112 10/32 DocID026319 Rev 2 6.3 Reverse current protection The device avoids the reverse current to flow from output to input during any operating condition (with enable pin in high or low status).The reverse current protection acts in particular during fast turning on/off operations or when another power supply (with higher voltage than the input one) is connected to the output port. If a power supply with lower voltage than the LDO output voltage is connected to VOUT pin, LDO enters the current protection status, causing high power dissipation. In the application, the LDL112 reverse current protection acts in the following cases: 1. Off-state, EN pin is at GND level, VOUT > [VIN + 100 mV]. In this case the device power pass element (MOSFET) is off, the bulk and gate are switched to VOUT and therefore all possible current paths from VOUT to VIN are interrupted. 2. On-state, EN pin is at high level and VOUT > VOUT(nominal). In this condition, VOUT is higher than the nominal level, so the device op-amp works in open loop and the power element is off. VGS is zero, the bulk and gate are switched to VOUT (where VOUT > [VIN + 100 mV]) therefore all possible current paths from VOUT to VIN are interrupted. 3. On-state, EN pin is at high level and VOUT< VOUT(nominal). In this condition VOUT is lower than the nominal level, so the op-amp works in open loop with the power MOSFET on. VGS is maximal so the power channel conducts with very low RDS(on). When VOUT > VIN the current can flow from VOUT to VIN until the condition VOUT > (VIN + 100 mV) is reached. |
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Similar Description - LDL112PU33R |
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