MP103 Rev. 1.01

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18

1/23/2014

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FLOW CHART

（

Start

VIN<29.55V

Turn On Driver,

N

Y

UVLO, OTP, Vo SCP, OLP Protection are auto restart

VIN>32.75V

VIN>71V

Slowly Turn Off

Driver of BJT

Fast Turn Off Driver

of BJT

VB>15.25V

VB<7.6V

Turn On LDO

IDR=200mA

Turn Off LDO

Turn On Active

Bleeder

Turn Off Active

Bleeder

Slowly Turn On

(13)

Slowly Turn Off

Monitor Output

Current

Monitor VRT

VRT<0.8V

Thermal Monitor

TSD=Logic High

Y

Y

Y

Y

Y

Y

Y

Y

YY

N

N

NN

N

N

N

NN

N

Y

Y

VB<VOUT+7.25V

VB>VOUT+7.95V

Monitor VB and

VOUT

VB>VOUT+9V

VB<VOUT+8.1V

Notes:

12) The parameters in the flow chart refer to the 12V output voltage.

13) The ‘slowly turn on’ only happens when VIN is from high voltage to low voltage through VIN slow turn on threshold while VB is lower than

its turn on threshold.