irs2609d International Rectifier Corp., irs2609d Datasheet - Page 9

• Manufacturer Part Number: irs2609d
• Description: Half-bridge Driver
• Manufacturer: International Rectifier Corp.

Undervoltage Lockout Protection
This family of ICs provides undervoltage lockout protection on both the V
(high-side circuitry) power supply. Figure 9 is used to illustrate this concept; V
crosses the UVLO threshold (V
Upon power-up, should the V
decreases below the V
shutdown the high- and low-side gate drive outputs, and the FAULT pin will transition to the low state to inform the controller of the
fault condition.
Upon power-up, should the V
decreases below the V
shutdown the high-side gate drive outputs of the IC.
The UVLO protection ensures that the IC drives the external power devices only when the gate supply voltage is sufficient to fully
enhance the power devices. Without this feature, the gates of the external power switch could be driven with a low voltage, resulting
in the power switch conducting current while the channel impedance is high; this could result in very high conduction losses within the
power device and could lead to power device failure.
Shoot-Through Protection
The IRS2609D high-voltage ICs is equipped with shoot-through protection circuitry (also known as cross-conduction prevention
circuitry).
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CCUV-
BSUV
threshold during operation, the undervoltage lockout circuitry will recognize a fault condition, and
CC
threshold during operation, the undervoltage lockout circuitry will recognize a fault condition and
BS
CCUV+/-
voltage fail to reach the V
voltage fail to reach the V
or V
BSUV+/-
Figure 8: HIN & LIN input thresholds
) the undervoltage protection is enabled or disabled.
Low
Figure 9: UVLO protection
V
IH
CCUV+
BSUV
threshold, the IC will not turn-on. Additionally, if the V
threshold, the IC will not turn-on. Additionally, if the V
High
CC
(logic and low-side circuitry) power supply and the V
CC
(or V
V
IL
Low
BS
) is plotted over time and as the waveform
IRS2609DSPbF
CC
BS
voltage
voltage
9
BS