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Datasheet

Datasheet

BD768xFJ-LB Series

TSZ02201-0F1F0A200050-1-2

17.Apr.2015. Rev.001

© 2015 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

BD768xFJ includes the VCC low voltage protection function VCC UVLO (Under Voltage Protection) and the VCC

over voltage protection function VCC OVP (Over Voltage Protection). These functions prevent abnormal

voltage-related damage in MOSFETs used for switching.

The VCC UVLO function uses an auto recovery type comparator with voltage hysteresis and the VCC OVP

function uses latch mode or auto recovery.

This operation is shown in Figure 3.

This function masks any surges, etc., that occur at the pin.

18.5Vtyp

VCC

OFF

Time

ON

OFF

ON

29.5Vtyp

OUT

Switching

14.0Vtyp

VCC UVLO

ON

OFF

ON

OFF

VCC OVP

OFF

ON

OFF

A

BC

D E

F

OFF

Internal

Latch Signal

L : Normal

H : Latch

VH

G

HI

J

K

L

M

Vlatch=

VCCuvlo2-

3.5Vtyp

N

A

Time

Figure 3.

VCC UVLO / OVP (Latch Mode)

A: VH is applied, VCC voltage rises

E: VCC voltage drops until DC/DC operation starts.

F: VCC rises.

G: When DC/DC operation stops, power supply from the auxiliary coil stops and VCC voltage drops.

current consumption is lowered.

K: Same as H

L: Same as I

M: VH is OPEN (unplugged). VCC drops.