FAN73892 Fairchild Semiconductor, FAN73892 Datasheet - Page 13

• Manufacturer Part Number: FAN73892
• Description: The FAN73892M is a monolithic three-phase half-bridge gate-drive IC designed for high-voltage, high-speed, driving MOSFETs and IGBTs operating up to +600V
• Manufacturer: Fairchild Semiconductor

© 2011 Fairchild Semiconductor Corporation
FAN73892 • Rev.1.0.1
Applications Information
1. Dead Time
Dead time is automatically inserted whenever the dead
time of the external two input signals (between
and
times (DT1 and DT2). Otherwise, external dead times
larger than internal dead times are not modified by the
gate driver and internal dead-time waveform definition is
shown in Figure 37.
2. Protection Function
2.1 Fault Out (
The high- and low-side drivers include under-voltage
lockout (UVLO) protection circuitry that monitors the
supply voltage for V
designed to prevent malfunction when V
lower than the specified threshold voltage. The UVLO
hysteresis prevents chattering during power-supply
transitions. Moreover, the fault signal (power supply
voltage
during power-on events when the power supply (V
below the under-voltage lockout high threshold voltage
for the circuit (during t
otherwise activated; shown Figure 38.
Figure 38. Waveforms for Under-Voltage Lockout
LINx
Figure 37. Internal Dead-Time Definitions
FO
signals) is shorter than internal fixed dead
) goes to LOW state to operate reliably
FO
) and Under-Voltage Lockout
DD
and V
1
~ t
2
BS
). The UVLO circuit is not
independently. It can be
DD
and V
BS
HINx
DD
are
) is
2.2 Shoot-Through Protection
The shoot-through protection circuitry prevents both
high- and low-side switches from conducting at the
same time, as shown Figure 39.
2.3 Enable Input
When the EN pin is in HIGH state, the gate driver
operates normally. When a condition occurs that should
shut down the gate driver, the EN pin should be LOW.
The enable circuitry has an input filter; the minimum
input duration is specified by t
13
Figure 40. Output Enable Timing Waveform
Figure 39. Shoot-Through Protection
FLT,IN
(typically 250ns).
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