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IRS21867S
Undervoltage Lockout Protection
This IC 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 7 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.
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 7: UVLO protection
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12
? 2010 International Rectifier
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