A
30 Watt XW Dual Series DC/DC Converters
Manufacturing Company, Inc. Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
1
DOUBLE SHIELDED
ISOLATION
TRANSFORMER
THERMAL SHUTDOWN
PI
INPUT
FILTER
VOLTAGE
FEED
FORWARD
PWM
ISOLATED
FEEDBACK
LOW TC
BAND GAP
REFERENCS
SIX-SIDED SHIELDED COPPER CASE
100F
47F
100F
47F
1 MEG || 0.01 F
3
4
5
1
2
8
+ INPUT
- INPUT
ON/OFF
+ OUTPUT
CMN
- OUTPUT
Features
!
30 Watts of Output Power from Either
or Both Outputs
!
2:1 Extra Wide Input Range
!
High, Nearly Constant Efficiency (81-88%)
!
500 VDC Minimum Input To Output Isolation
!
Short Circuit Protection
!
Resettable Thermal Overload Circuit
!
Overvoltage Protection for Input and Outputs
!
No Derating to 80°C Case Temperature
!
5 Year Warranty
30 Watt XW Dual Series Block Diagram
Description
These dual output converters are designed for wide input
range, low noise telecommunications, industrial control and
instrument applications. The extra wide input range (2:1) is
ideal for battery or unregulated input applications.
These converters are state-of-the-art 80 kHz MOSFET
based designs that provide outstanding line and load
regulation.
The dual outputs are regulated with a high loop gain
feedback 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.
Also included is a logic (open collector TTL / CMOS
compatible) shutdown pin to control converter operation.
The XW Dual Series is protected from output shorts to
common by a high speed pulse by pulse digital current limit
circuit and a resettable thermal shut down circuit.
The outputs and input are overvoltage protected.
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