ACT4455
Rev 2, 21-Nov-12
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified.)
PARAMETER
Feedback Voltage
Error Amplifier Voltage Gain
Error Amplifier Transconductance
Over Voltage Protection Threshold
Max E/A Source Current
Max E/A Sink Current
High-Side Switch ON-Resistance
Low-Side Switch ON-Resistance
Maximum Duty Cycle
Switching Frequency
Upper Switch Current Limit
COMP to Current Limit
Transconductance
Minimum on Time
Input Under Voltage Lockout Thresh-
old
Input Under Voltage Lockout Hystere-
sis
Internal Soft Startup Time
CS1 reference voltage
CS2 reference voltage
Frequency Foldback Threshold
Cord Compensation
Thermal Shutdown
SYMBOL
V
FB
A
EA
G
EA
V
OVP
I
SRCMAX
I
SINKMAX
R
DS(ON)1
R
DS(ON)2
D
MAX
F
SW
I
LIM
G
COMP
T
ON_MIN
V
IN_Rise
V
IN_Falling
T
SS
V
CS1
V
CS2
V
FB_Foldback
TEST CONDITIONS
7.5V
≤
V
IN
≤
40V
MIN
798
TYP
808
4000
MAX
818
UNIT
mV
V/V
µA/V
V
µA
µA
mΩ
Ω
%
∆I
COMP
= ± 10µA
650
41
V
FB
= 0.5V
V
FB
= 1.0V
At 25°C
120
120
38
5
80
180
200
6.5
5
250
220
kHz
A
A/V
ns
Duty Cycle = 65%
V
IN
Rising
V
IN
Falling
6.75
7
650
3.0
7.25
V
mV
ms
113
113
116
116
0.65
119
119
mV
mV
V
V
°C
V
IN
= 12V, R
FB1
=200k, I
OUT
=
5A
0.35
150
Innovative Power
TM
-4-
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ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
