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| BD7679G Datasheet, PDF (5/20 Pages) Rohm – PWM current mode method | |||
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BD7679G
Datasheet
( 2 ) VCC Pin Protection
BD7679G includes UVLO (Under Voltage Locked Out) and OVP (Over Voltage Protection) functions to monitor VCC pin
voltage (see Figure 6 for OVP auto-restart operation).
The UVLO function prevents damage to MOSFET by stopping switching operations when the VCC pin voltage drops to VCC
< VUVLO2 (= 7.5V Typ).
The VCC OVP function prevents damage to MOSFET by stopping switching operations when the VCC pin voltage exceeds
VOVP1 (= 27.5V Typ). Once the switching is stopped, IC stops switching until VCC < VOVP2(=22.5V Typ).
A blanking time of TSTOP(=100us.Typ) is prepared for protecting mal-function.
VCC
27.5V
22.5V
13.5V
7 .5 V
Time
SW
ON
ON
OFF
OFF
ON
Time
Figure 6, VCC UVLO/OVP Operation (Auto-restart)
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© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0F2F0A200160-1-2
2015.6.24 Rev.002
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