APR3415 datasheet(8/13 Pages) DIODES

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APR3415

Document number: DS36738 Rev. 7 - 2

8 of 13

www.diodes.com

June 2015

APR3415

A Product Line of

Diodes Incorporated

Output Voltage Detect Function Description

VDET

VCC V

VTRIGGER

VOFF

tOSC

VOVP

VTRIGGER

IVCC

IDIS

UVLO

VDIS

IOVP

tDIS

tOSC

tOVP_LAST

Figure 1. Typical Waveforms of APR3415

When VCC is beyond power-on voltage (VON), the APR3415 starts up. The VDET pin asserts a periodical pulse and the oscillation period is tOSC.

When VCC is beyond the trigger voltage (VTRIGGER), the periodical pulse at VDET pin is discontinued. When VCC is beyond the discharge voltage

(VDIS), the discharge circuit will be enabled, and a 3mA current (IDIS) will flow into VCC pin. When VCC is higher than the overshoot voltage (VOVP),

the APR3415 will enable a discharge circuit, the discharge current (IOVP) will last tOVP_LAST time. After the tOVP_LAST time, APR3415 will stop the

discharge current and detect VCC voltage again. If VCC is still higher than VOVP, the tOVP_LAST time discharge current will be enabled again. Once the

OVP discharge current is asserted, the periodical pulse at VDET pin will be disabled.

When the VCC falls below the power-off voltage (VOFF), the APR3415 will shut down.

Operation Description

MOSFET Driver

The operation of the SR is described with timing diagram shown in Figure 2. APR3415 monitors the MOSFET drain-source voltage. When the

drain voltage is lower than the turn-on threshold voltage VTHON, the IC outputs a positive drive voltage after a turn-on delay time (tDON). The

MOSFET will tu

rn on and the current will transfer from the body diode into the MOSFET’s channel.

In the process of drain current decreasing linearly toward zero, the drain-source voltage rises synchronically. When it rises over the turn off

threshold voltage VTHOFF, APR3415 pulls the drive signal down after a turn off delay (tDOFF).

I,V

VDET

VDRISR

VTHON

VTHOFF

0.1VDRISR

0.9VDRISR

0.1VDRISR

0.9VDRISR

tRG

tDON

tFG

tDOFF

Figure 2. Typical Waveforms of APR3415

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