STOD13AS datasheet(19/25 Pages) STMICROELECTRONICS

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STOD13AS

Detailed description

Doc ID 022733 Rev 1

19/25

normal functionality (assuming that the short condition is removed), it is necessary to restart

the converter through an enable transient.

8.1.11

Short-circuit protection (SCP)

When short-circuit occurs, the device is able to detect the voltage difference between VIN

and VOUT. Overshoots are limited, decreasing the inductor current. After that, the output

stages of the device are turned off. This status is maintained, avoiding current flowing to the

load. A new ENABLE transition is needed to restart the device. During startup the short-

circuit protection is active.

8.1.12

Fast discharge

When ENABLE turns from high to low level, the device goes into shutdown mode LX1 and

LX2 stop switching. If the FD pin is low, a resistor of about 400

Ω is connected between

VMID and VO2 to discharge quickly CMID and CO2 capacitors, lowering in about 10 ms the

differential output voltage (VMID-VO2) below 10% of nominal value. When the output

voltages are discharged to 0 V, the switches turn off and the outputs are high impedance.

When the FD pin is high, the fast discharge after shutdown is off.

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