25 to 45 Watt UW Single Series DC/DC Converters
Features
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Ultra Wide Input Voltage Range
Low Noise, Highly Regulated Single Outputs
No Derating to 80擄C Case Temperature
Six-Sided Shielded Low Thermal
Gradient Copper Case
Overvoltage Protected Output
Pulse by Pulse Digital Current Limiting Thermal
Overload Protection
Direct Paralleling of Outputs
5 Year Warranty
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Description
These converters are state-of-the-art 100kHz Bipolar based
designs that provide outstanding efficiency of up to 91% at full
load. The output is regulated with a high loop gain feed
forward control method that provides linear regulator type
performance with a true, high efficiency switching DC/DC
topology. The large amount of loop gain insures excellent
input ripple rejection and line transient response.
Outstanding line and load regulation are achieved over the
full input voltage range and over the specified load current
range by the use of external voltage sensing circuitry. Also
included are a logic shutdown pin to control converter operation
and an output voltage trim pin.
The converters are protected from output shorts to common
by a high speed, pulse by pulse digital, current limit circuit and
a resettable thermal shutdown circuit. The output and the
power switch are overvoltage protected.
Model
12S5.5000UW
24S12.2500UW
24S12.3500UW
24S15.3000UW
Selection Chart
Input Range
VDC
MIN
MAX
7.0
14.0
14.0
17.0
40.0
40.0
40.0
40.0
Output
VDC
5.0
12.0
12.0
15.0
Output
mA
5000
2500
3500
3000
25 to 45 Watt UW Single Series Block Diagram
+ INPUT 1
PI
INPUT
FILTER
- INPUT 2
C1
D1
A
C2
6 + OUTPUT
7 CMN
THERMAL SHUTDOWN
ON/OFF 8
Output
C1
C2
D1
5
12
15
1000碌F
330碌F
330碌F
1000碌F
47碌F
47碌F
6.8V
15V
18V
VOLTAGE
FEED
FORWARD
PWM
SHIELDED COPPER CASE
3 + SENSE
4 TRIM
5 - SENSE
2401 Stanwell Drive 鈥?Concord, California 94520 鈥?Ph: 925/687-4411 or 800/542-3355 鈥?Fax: 925/687-3333 鈥?www.calex.com 鈥?Email: sales@calex.com
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3/2001
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