IRS2336 Datasheet, PDF(22/47 Page) International Rectifier

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

IRS2336 Datasheet, PDF (22/47 Pages) International Rectifier – HIGH VOLTAGE 3 PHASE GATE DRIVER IC

◁

IRS2336x(D) Family

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 IRS2336xD family of high-voltage ICs is equipped with shoot-through protection circuitry (also known as cross-

conduction prevention circuitry). Figure 10 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 IRS2336(D) has inverting inputs (the output is out-of-phase with its respective input)

while the IRS23364D has non-inverting inputs (the output is in-phase with its respective input).

www.irf.com

▷