IRS25091SPBF データシートの表示（PDF） - International Rectifier

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IRS25091SPBF

HALF-BRIDGE DRIVER

International Rectifier 

IRS25091SPbF

V IH

VIL

High

Low

Low

Figure 8: HIN & LIN input thresholds

Undervoltage Lockout Protection

This family of ICs provides undervoltage lockout protection on both the VCC (logic and low-side circuitry) power supply and the VBS

(high-side circuitry) power supply. Figure 9 is used to illustrate this concept; VCC (or VBS) is plotted over time and as the waveform

crosses the UVLO threshold (VCCUV+/- or VBSUV+/-) the undervoltage protection is enabled or disabled.

Upon power-up, should the VCC voltage fail to reach the VCCUV+ threshold, the IC will not turn-on. Additionally, if the VCC voltage

decreases below the VCCUV- 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 VBS voltage fail to reach the VBSUV threshold, the IC will not turn-on. Additionally, if the VBS voltage

decreases below the VBSUV 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 IRS25091 high-voltage IC is equipped with shoot-through protection circuitry (also known as cross-conduction prevention

circuitry).

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