FAN7389 Fairchild Semiconductor, FAN7389 Datasheet - Page 15

• Manufacturer Part Number: FAN7389
• Description: The FAN7389 is a monolithic three-phase half-bridge gate-drive IC designed for high-voltage, high-speed driving MOSFETs and IGBTs operating up to +600V
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FAN7389 • Rev. 1.0.1
3.2. Short-Pulsed Input Noise Rejection Method
The input filter circuitry provides protection against
short-pulsed input signals (HINx, LINx, and EN) on the
input signal lines by applied noise signal.
If the input signal duration is less than input filter time
(t
Example A and B of the Figure 44 show the input and
output waveforms with short-pulsed noise spikes with a
duration less than input filter time; the output does not
change states.
FLT,IN
Figure 44. Noise Rejecting Input Filter Definition
), the output does not change states.
15
Figure 45 shows the characteristics of the input filters
while receiving narrow ON and OFF pulses. If input
signal pulse duration, PW
t
is rejected by input filter. Once the input signal pulse
duration, PW
output pulse durations, PW
durations, PW
about 250ns for the high- and low-side outputs.
FLT,IN
Figure 45. Input Filter Characteristic of Narrow ON
; the output pulse, PW
IN
IN
, exceeds input filter time, t
. FAN7389 input filter time, t
IN
, is less than input filter time,
OUT
OUT
, matches the input pulse
, is zero. The input signal
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FLT,IN
FLT,IN,
, the
is