AP3965/66/71

Document number: DS36531 Rev. 3 - 2

8 of 13

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November 2013

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AP3965/66/71

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Diodes Incorporated

Thus the output constant current is given by:

Ipk

N

N

3

1

I

S

P

OUT

⋅

⋅

=

…………(9)

Leading Edge Blanking (LEB)

When the power switch is turned on, a turn-on spike on the output pulse rising edge will occur on the sense-resistor. To avoid false termination of

the switching pulse, a typical 500ns leading edge blanking is built in. During this blanking period, the current sense comparator is disabled and the

gate driver cannot be switched off.

The built-in LEB in AP3965/66/71 has shorter delay time from current sense terminal to output pulse than those IC solutions adopting external RC

filter as LEB.

Built-in Cable Compensation

The AP3965/66/71 has built-in fixed voltage of 0.35V typical to compensate the drop of output cable when the load is changed from zero to full

load. A typical 0.01µF external capacitor connected to the CPC pin is used to smooth voltage signal for cable compensation.

Over Temperature Protection

The AP3965/66/71 has internal thermal sensing circuit to shut down the PFM driver output when the die temperature reaches 160°C typical. When

the die temperature drops about 40°C, the IC will recover automatically to normal operation.