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ACT4455 Datasheet(PDF) 4 Page - Active-Semi, Inc

Part # ACT4455
Description  36V/5A Step Down DC/DC Converter
PDF  16 Pages
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Manufacturer  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT4455 Datasheet(HTML) 4 Page - Active-Semi, Inc

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ACT4455
Rev 2, 21-Nov-12
Innovative Power
TM
- 4 -
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Feedback Voltage
VFB
7.5V ≤ VIN ≤ 40V
798
808
818
mV
Error Amplifier Voltage Gain
AEA
4000
V/V
Error Amplifier Transconductance
GEA
∆ICOMP = ± 10µA
650
µA/V
Over Voltage Protection Threshold
VOVP
41
V
Max E/A Source Current
ISRCMAX
VFB = 0.5V
120
µA
Max E/A Sink Current
ISINKMAX
VFB = 1.0V
120
µA
High-Side Switch ON-Resistance
RDS(ON)1
At 25°C
38
mΩ
Low-Side Switch ON-Resistance
RDS(ON)2
5
Ω
Maximum Duty Cycle
DMAX
80
%
Switching Frequency
FSW
180
200
220
kHz
Upper Switch Current Limit
ILIM
Duty Cycle = 65%
6.5
A
COMP to Current Limit
Transconductance
GCOMP
5
A/V
Minimum on Time
TON_MIN
250
ns
Input Under Voltage Lockout Thresh-
old
VIN_Rise
VIN Rising
6.75
7
7.25
V
Input Under Voltage Lockout Hystere-
sis
VIN_Falling
VIN Falling
650
mV
Internal Soft Startup Time
TSS
3.0
ms
CS1 reference voltage
VCS1
113
116
119
mV
CS2 reference voltage
VCS2
113
116
119
mV
Frequency Foldback Threshold
VFB_Foldback
0.65
V
Cord Compensation
VIN = 12V, RFB1=200k, IOUT =
5A
0.35
V
Thermal Shutdown
150
°C
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)



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