HF01B00/01/02/03/04

–OFF LINE HIGH VOLTAGE QUASI RESONANT REGULATOR

HF01B00/01/02/03/04 Rev. 1.2

www.MonolithicPower.com

13

4/9/2013

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Start

Vcc>11.8V

Vcc<8.5V?

and

OLP=Logic

High

Internal High Voltage

Current Source ON

Toff<

7.8uS

Y

N

Soft Start

Monitor Vcc

Burst Mode

Operation

QR mode Operation

Constraint

Toff_min≥7.8uS

Y

N

N

Y

OLP=Logic High

Y

Thermal

Monitor

Y

Vcc Decrease

to 5.5V

Shut Down

Internal High Voltage

Current Source

Latch off the

Switching Pulse

N

Continuous

Fault Monitor

Vcc<8V

Y

N

OVP=

Logic

High?

N

Y

OTP=

Logic

High?

Y

N

UVLO, OTP & OLP are auto restart , OVP

is latch

Release from the latch condition , need to

unplug from the main input .

Pin Demag

Monitor

Vcc<3V?

Y

N

Shut off the

Switching

Pulse

Y

Figure 12

—Control Flow Chart