APR343 datasheet(7/12 Pages) DIODES

7 / 12 page

APR343

Document number: DS36884 Rev. 4 - 2

7 of 12

www.diodes.com

December 2014

APR343

A Product Line of

Diodes Incorporated

Output Voltage Detection Function Description

VDET

VCC V

VTRIGGER

VOFF

tOSC

VOVP

VTRIGGER

IVCC

IDIS

UVLO

VDIS

IOVP

tDIS

tOSC

tOVP_LAST

Figure 1. Typical Waveforms 1 of APR343

When VCC is beyond power-on voltage (VON), the APR343 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 APR343 will enable a discharge circuit, the discharge current (IOVP) will last tOVP_LAST time. After the tOVP_LAST time, APR343 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 is below the power-off voltage (VOFF), the APR343 will be shut down.

MOSFET Driver Operation Description

I,V

VDET

VDRISR

VTHON

VTHOFF

0.1VDRISR

0.9VDRISR

0.1VDRISR

0.9VDRISR

tRG

tDON

tFG

tDOFF

Figure 2. Typical Waveforms 2 of APR343

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