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IRS26310DJPbF
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 8 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 8: UVLO protection
Shoot-Through Protection
The IRS26310D is equipped with shoot-through protection circuitry (also known as cross-conduction prevention
circuitry). Figure 9 shows how this protection circuitry prevents both the high- and low-side switches from conducting
at the same time. Table 1 illustrates the input/output relationship of the devices in the form of a truth table. Note that
the IRS26310D has non-inverting inputs (the output is in-phase with its respective input).
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? 2008 International Rectifier
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