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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 (V DD ) and bootstrap capaci-
tor voltage (V BS1,2,3 ) independently. It can be designed
prevent malfunction when V DD and V BS1,2,3 are lower
than the specified threshold voltage. The UVLO hystere-
sis prevents chattering during power supply transitions.
1.2 Shoot-Through Prevention Function
The FAN7888 has shoot-through prevention circuitry
monitoring 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 27 and 28.
HIN1,2,3/LIN1,2,3
LIN1,2,3/HIN1,2,3
Shoot-Through Prevent
HO1,2,3/LO1,2,3
After DT
LO1,2,3/HO1,2,3
After DT
FAN7888 Rev.00
Figure 27. Waveforms for Shoot-Through Prevention
HIN1,2,3/LIN1,2,3
LIN1,2,3/HIN1,2,3
Shoot-Through Prevent
HO1,2,3/LO1,2,3
After DT
LO1,2,3/HO1,2,3
FAN7888 Rev.00
Figure 28. Waveforms for Shoot-Through Prevention
? 2008 Fairchild Semiconductor Corporation
FAN7888 ? Rev.1.0.1
11
2. Operational Notes
The FAN7888 is a three half-bridge gate driver with
internal, typical 120 ns dead-time for the three-phase
brushless DC (BLDC) motor drive system, as shown in
Figure 1.
Figure 29 shows a switching sequence of 120 ? electrical
commutation for a three-phase BLDC motor drive system.
The waveforms are idealized: they assumed that the
generated back EMF waveforms are trapezoidal with flat
tops of sufficient width to produce constant torque when
the line currents are perfectly rectangular, 120 ? electrical
degrees, with the switching sequence as shown in Figure
29. The operating waveforms of the wye-connection
reveal that repeat every 60 electrical degrees, with each
60 ? segment being “commutated” to another phase, as
shown in Figure 29.
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