JAJSHW4 September 2019 LM74202-Q1
PRODUCTION DATA.
The device incorporates circuitry to protect the system during overvoltage conditions. This device features an overvoltage cut off functionality. A voltage more than V(OVPR) on OVP pin turns off the internal FET and protects the downstream load. To program the OVP threshold, connect a resistor divider from IN supply to OVP terminal to RTN as shown in Figure 21. OVP Overvoltage Cut-off response is shown in Figure 22. OVP pin must not be left floating. If OVP pin could be floating due to dry soldering, an additional zener diode at the output will be required for protection from over voltage.
Programmable overvoltage clamp can also be achieved using LM74202-Q1 by connecting the resistor ladder from Vout to OVP to RTN as shown in Figure 23 . This results in clamping of output voltage close to OVP set-point by resistors R1 and R2. as shown in Figure 24. This scheme will also help in achieving minimal system Iq during off state. For this OVP configurataion, use R1 > 90 kΩ.
If the OVP pin is connected to GND, the device will clamp the output voltage to 37.5 V (typical).