Diodes AP3436/A - Manual (Page 11)

AP3436/A
Document number: DS37212 Rev. 2 - 2
11 of 15
www.diodes.com
April 2014
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AP3436/A
A Product Line of
Diodes Incorporated
Application Information
(Cont.)
7. Over Voltage Protection (OVP)
The output voltage is continuously monitored for Over Voltage Protection by FB pin. When it is larger than 1.67 times as setting, the OVP function
is triggered. The Over Voltage Protection has 65µs triggered delay.
When OVP is triggered, both high side and low side are shutdown immediately and the output voltage is discharged by an internal 1k Ω resistor.
8. Power Good
The PGOOD pin output connects an open drain MOSFET. The output is pulled low when the FB voltage enters the fault condition by falling below
75% or rising above 125% of the nominal internal reference voltage. There is a 7% hysteresis on the threshold voltage, so when the FB voltage
rises to the good condition above 82% or falls below 118% of the internal voltage reference the PGOOD output MOSFET is turned off. It is
recommended to use a pull-up resistor between the values of 3k Ω and 100kΩ to a voltage source that is 5V or less.
9. Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds +160°C. Switching is stopped when the
junction temperature exceeds the thermal trip threshold. Once the die temperature decreases below +140°C, the device reinitiates the soft start
operation. The thermal shutdown hysteresis is +20°C.