F72814 参数 Datasheet PDF下载

F72814

3V

1.5V

VOUT

0V

t0

tss

2tss

3tss

4tss

TIME

Figure 4 : Under voltage event occur

But UV_FB has some differences from OC, it always trigger VIN power sensing after 4 times hiccup.

7.6 Shutdown

It can shut down the F72814 PWM controller to pull low the OCSET pin under 0.15V.

7.7 VIN Sense

The F72814 Vin power is sensed by OCSET voltage at first soft start event, when soft start event occurs. UGATE pulse will be

enabled, and the F72814 detects the first ten UGATE high pulse. If there are four PH_M pulse during the ten pulse period, it means

Vin ready, If Vin is ready, VOUT will be ramped up in next soft start event. Otherwise, we will check Vin voltage at the next soft start

event.

5V

VCC

PWOK

VOUT

0V

1

UGATE

Figure 5 :

2

3

4

5

6

7

TIME (ms

F72814

-7-

V0.23P