IRS2608DSPBF データシートの表示（PDF） - International Rectifier

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IRS2608DSPBF

HALF-BRIDGE DRIVER

International Rectifier 

IRS2608DSPbF

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 7 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 7: UVLO protection

Shoot-Through Protection

The IRS2608D high-voltage ICs is equipped with shoot-through protection circuitry (also known as cross-conduction

prevention circuitry).

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