AP3101

Document number: DS37418 Rev. 2 - 2

8 of 12

www.diodes.com

July 2014

© Diodes Incorporated

AP3101

A Product Line of

Diodes Incorporated

Leading Edge Blanking

A narrow spike on the leading edge of the current waveform can usually be observed when the power MOSFET is turned on. A 270ns leading-

edge blank is built-in to prevent the false-triggering caused by the turn-on spike; so the RC filter on the current sense input can be removed.

During this period, the current limit comparator is disabled and the gate driver cannot be switched off.

Built-in Slope Compensation

It is well known that a continuous current mode SMPS may become unstable when the duty cycle exceeds 50%. The built-in slope compensation

can improve the stability, so there is no need for design engineer to spend much time on that.

Short Circuit Protection

Built-in short circuit protection can protect a SMPS from being damaged when short circuit of output or over load conditions happen. The

feedback voltage will keep its value above its upper limit of 4.2V as long as short circuit exists, and then gate driver will be turned off after fixed

restart. The SMPS will not recover its normal operation until the short circuit or over load is removed.

Green Mode Operation

ADJ pin is the non-inverting input of skip cycle comparator. The voltage at FB pin minus 0.9V is compared with the voltage at ADJ pin. If the

and operate intermittently. The threshold is adjustable by changing the value of the resistor connected from pin ADJ to the ground.