Active-Semi
ELECTRICAL CHARACTERISTICS
(V
IN
= 20V, T
A
= 25°C, unless otherwise specified.)
ACT4523
Rev 4, 21-Jul-11
PARAMETER
Input Voltage
Input Voltage Surge
V
IN
UVLO Turn-On Voltage
V
IN
UVLO Hysteresis
Standby Supply Current
Shutdown Supply Current
Feedback Voltage
Internal Soft-Start Time
Error Amplifier Transconductance
Error Amplifier DC Gain
Switching Frequency
Foldback Switching Frequency
Maximum Duty Cycle
Minimum On-Time
COMP to Current Limit Transconductance
Secondary Cycle-by-Cycle Current Limit
Slope Compensation
ISET Voltage
ISET to IOUT DC Room Temp Current Gain
CC Controller DC Accuracy
EN Threshold Voltage
EN Hysteresis
EN Internal Pull-up Current
High-Side Switch ON-Resistance
SW Off Leakage Current
Thermal Shutdown Temperature
Thermal Shutdown Temperature Hysteresis
TEST CONDITIONS
MIN
10
TYP
MAX
38
40
UNIT
V
V
V
V
Input Voltage Rising
Input Voltage Falling
V
EN
= 3V, V
FB
= 1V
V
EN
= 3V, V
OUT
= 5V, No load
V
EN
= 0V
9.0
9.4
1.1
0.9
3.0
75
9.7
1.4
mA
mA
115
824
µA
mV
µs
µA/V
V/V
792
808
400
V
FB
= V
COMP
= 0.8V,
∆I
COMP
= ± 10µA
650
4000
V
FB
= 0.808V
V
FB
= 0V
200
225
30
250
kHz
kHz
85
88
200
91
%
ns
A/V
A
A
V
A/A
V
COMP
= 1.2V
Duty = D
MAX
Duty = D
MAX
5.25
4.5
1.2
1
IOUT / ISET, R
ISET
= 19.6kΩ
R
ISET
= 19.6kΩ, V
OUT
= 3.5V
Open-Loop DC Test
EN Pin Rising
EN Pin Falling
1175
1.47
25000
1190
1.6
125
4
0.16
1205
1.73
mA
V
mV
µA
Ω
V
EN
= V
SW
= 0V
Temperature Rising
Temperature Falling
1
150
20
10
µA
°C
°C
Innovative Power
TM
-4-
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