Freescale Semiconductor, Inc.
Recovery Spikes
Load Capacitance and/or
Diode Reverse Recovery Spikes
Diode Reverse
I
OUT
I
I
LOAD
,
OUTPUT CURRENT (A)
OUT
,
,
CURRENT (A)
8.0
6.5
PWM
Active
Current
Current
Limiting
Limiting
(See Figure
6)
(See
Figure
7)
(See
7)
0
or IN2
IN1
OR
IN2
IN2 or IN1
IN1
OR
IN2
I
SCL
Short Circuit Detect Threshold
Typ. Short Ckt. Detect Threshold
for Low-Side FETs
Typical Current
Threshold
Typ. Current Limit
Limiting Threshold
Hard Short Detect and Latch-OFF
Hard Short Detect and Latch-Off
INn, LOGIC IN
Freescale Semiconductor, Inc...
[1]
[0]
IN1 IN2
IN1 IN2
IN2 or IN1
IN2
OR
IN1 or IN2
IN2
OR
IN1
D1, LOGIC IN
D2, LOGIC IN
FS, LOGIC OUT
SF
[1]
[0]
[1]
[0]
[1]
Outputs
Outputs
Tristated
Tri-stated
Outputs Operational
Outputs Operational
(per Input Control Condition)
(per Input Control Condition)
TIME
Outputs
Tristated
Tri-stated
[0]
Figure 6. Active Current Limiting Versus Time
I
LOAD
, OUTPUT CURRENT (A)
I
OUT
,
CURRENT (A)
8.0
IShort Circuit Detect Threshold
Overcurrent Minimum Threshold
SCL
Short Circuit Detect Threshold
t
a
6.5
t
b
t
a
= Tristate Latch-OFF Time
a
= Output Output OFF Time
tt
b
= Current Blanking Time
b
= Output Limit Blank Time
Typical Current
Typical PWM Load
Limiting Waveform
Current Limiting
Waveform
Hard Output
Hard Short Detect
Short Latch-OFF
Latch-Off Prevented During t
b
TIME
Figure 7. Active Current Limiting Detail
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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Go to: www.freescale.com
33886
9