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ELECTRICAL CHARACTERISTICS
TIMING DIAGRAMS
>8A
6.5
0
Active
Current
Limiting
on Low-Side
MOSFET
Short Circuit Detection Threshold
Typical Current Limit Threshold
High Current Load Being Regulated via Constant-OFF-Time PWM
Hard Short Detect ion and Latch-OFF
Moderate Current Load
[1]
IN1 or IN2
IN1 or IN2
[0]
IN1 IN2
IN2 or IN1
IN2 or IN1
[1]
[0]
[1]
[0]
[1]
Outputs
Outputs Operation
Outputs
[0]
Tri-Stated
(per Input Control Condition)
Tri-Stated
Time
Figure 10. Operating States
8.0
I Short Short Circuit Detection Circuit Detect SCL
Overcurrent Minimum Threshold Threshold
6.5
t on
t a a
t b b
Output Output
I LIM Limit Time Output
t a = = Tristate Constant-OFF Time Time
t b = = Current Blanking Time
Typical PWM Load
Current Limiting
Typical Current
Limiting Waveform
Waveform
5.0
0.0
Hard short occurs.
short Short is Detect ion
Hard Output detected during t b
and output is
Short Latch-OFF latched-off.
TIME
Figure 11. Example Short Circuit Detection Detail on Low-Side MOSFET
33887
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
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