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IRS2509SPbF
V IH
V IL
High
Low
Low
Figure 8: HIN & LIN input thresholds
Undervoltage Lockout Protection
This family of ICs provides undervoltage lockout protection on both the V CC (logic and low-side circuitry) power supply and the V BS
(high-side circuitry) power supply. Figure 9 is used to illustrate this concept; V CC (or V BS ) is plotted over time and as the waveform
crosses the UVLO threshold (V CCUV+/- or V BSUV+/- ) the undervoltage protection is enabled or disabled.
Upon power-up, should the V CC voltage fail to reach the V CCUV+ threshold, the IC will not turn-on. Additionally, if the V CC voltage
decreases below the V CCUV- threshold during operation, the undervoltage lockout circuitry will recognize a fault condition and
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 BS voltage fail to reach the V BSUV threshold, the IC will not turn-on. Additionally, if the V BS voltage
decreases below the V BSUV threshold during operation, the undervoltage lockout circuitry will recognize a fault condition, and
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.
Figure 9: UVLO protection
Shoot-Through Protection
The IRS2509 high-voltage IC is equipped with shoot-through protection circuitry (also known as cross-conduction prevention
circuitry).
www.irf.com
9
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