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Datasheet

Datasheet

BM2P0391

TSZ02201-0F1F0A200150-1-2

12.JULY.2016.Rev.001

© 2016 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

( 3 ) VCC pin protection function

BM2P0391 built in VCC low voltage protection function VCCUVLO (Under Voltage Lock Out), over voltage protection

function VCC OVP (Over Voltage Protection) and VCC charge function that operates in case of dropping the VCC

voltage. VCC UVLO and VCC OVP monitor VCC pin and prevent VCC pin from destroying switching MOSFET at

abnormal voltage.

VCC charge function stabilizes the secondary output voltage by charging from the high voltage line by start circuit at

dropping the VCC voltage.

( 3-1 ) VCC UVLO ／ VCC OVP function

VCC UVLO and VCC OVP are auto recovery protections. And they have voltage hysteresis. Refer to the operation

Figure 8. VCC UVLO / OVP Timing Chart

A: When voltage is applied to the DRAIN pin, VCC pin voltage starts rising.

stopped by the VCCOVP function.

G: The high voltage line VH drops.

H: Same as C.

I: Same as D.