AUIRS2336S【PDF 22/37 页】IC GATE DRIVER HV 3PHASE 28SOIC

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AUIRS2336S

Figure 15: Programming over-temperature

protection

Figure 16: Using over-current protection and over-

temperature protection

Truth Table: Undervoltage lockout, ITRIP, and ENABLE

Table 4 provides the truth table for the AUIRS2336S. The first line shows that the UVLO for V CC has been tripped;

the FAULT output has gone low and the gate drive outputs have been disabled. V CCUV is not latched in this case and

when V CC is greater than V CCUV , the FAULT output returns to the high impedance state.

The second case shows that the UVLO for V BS has been tripped and that the high-side gate drive outputs have been

disabled. After V BS exceeds the V BSUV threshold, HO will stay low until the HVIC input receives a new falling

transition of HIN. The third case shows the normal operation of the HVIC. The fourth case illustrates that the ITRIP

trip threshold has been reached and that the gate drive outputs have been disabled and a fault has been reported

through the fault pin. In the last case, the HVIC has received a command through the EN input to shutdown; as a

result, the gate drive outputs have been disabled.

VCC

VBS

ITRIP

EN

RCIN

FAULT

LO

HO

UVLO V CC

UVLO V BS

Normal operation

ITRIP fault

EN command

<V CCUV

15 V

15 V

15 V

15 V

—

<V BSUV

15 V

15 V

15 V

—

0V

0V

>V ITRIP

0V

—

5V

5V

5V

0V

High

High

High

Low

High

0

High impedance

High impedance

0

High impedance

0

LIN

LIN

0

0

0

0

HIN

0

0

Table 4: UVLO, ITRIP, EN, RCIN, & FAULT truth table

Advanced Input Filter

The advanced input filter allows an improvement in the input/output pulse symmetry of the HVIC and helps to reject

noise spikes and short pulses. This input filter has been applied to the HIN, LIN, and EN inputs. The working

principle of the new filter is shown in Figures 17 and 18.

Figure 17 shows a typical input filter and the asymmetry of the input and output. The upper pair of waveforms

(Example 1) show an input signal with a duration much longer then t FIL,IN ; the resulting output is approximately the

difference between the input signal and t FIL,IN . The lower pair of waveforms (Example 2) show an input signal with a

duration slightly longer then t FIL,IN ; the resulting output is approximately the difference between the input signal and

t FIL,IN .

Figure 18 shows the advanced input filter and the symmetry between the input and output. The upper pair of

waveforms (Example 1) show an input signal with a duration much longer then t FIL,IN ; the resulting output is

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? 2009 International Rectifier

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