FAN73833 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN73833

Half-Bridge Gate-Drive IC

Fairchild Semiconductor 

Application Information

1. Protection Function

1.1 Under-Voltage Lockout (UVLO)

The high- and low-side drivers include under-voltage

lockout (UVLO) protection circuitry for each channel that

monitors the supply voltage (VDD) and bootstrap capaci-

tor voltage (VBS) independently. It can be designed to

prevent malfunction when VDD and VBS are lower than

the specified threshold voltage. The UVLO hysteresis

prevent chattering during power supply transitions.

1.2 Shoot-Through Prevention Function

The shoot-through prevention circuitry monitors the high-

and low-side control inputs. It can be designed to prevent

outputs of high and low side from turning on at same

time, as shown Figure 23 and 24.

HIN

2. Switching Time Diagram

LIN

HIN

LO

50%

More than

dead time

50%

tOFF

90%

tON

HO

10%

50%

More than

dead time

50%

tON

10%

tOFF

90%

50%

tOFF

90%

Figure 25. Switching Time Definition

LIN

Shoot-Through Prevent

HO

After DT

LO

After DT

Figure 23. Waveforms for Shoot-Through Prevention

HIN

LIN

Shoot-Through Prevent

HO

After DT

LO

Figure 24. Waveforms for Shoot-Through Prevention

© 2008 Fairchild Semiconductor Corporation

FAN73833 • Rev. 1.0.0

10

www.fairchildsemi.com

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