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Key Features
Wide Input Ranges
Typical Efficiency of 81%
Remote On/Off
Overvoltage Protection
Short circuit Protection
Meets FCC Section 15 Sub Part J
Class A Radiated and Conducted
CE (LVD)
Designed to meet UL60950
Applications
Telecommunications Equipment
Digital Circuits
Private Branch Exchange
Product Data Sheet
20 Watt DC/DC Converters
Distributed Power Systems
Analog Systems
Industrial Control Systems
The 20 Watt DC/DC converters operate from a wide input range. This high density, low profile, small footprint
converter is ideal for board mountable applications where space is at a premium.
General Electrical Specifications
(Specifications at Nominal Input and 25 C, nominal input voltage and rated output current unless otherwise noted.)
INPUT SPECIFICATIONS
Input Voltage Range
See Selection Guide
Input Filter
LC
Input Current
See Selection Guide
Input Transient Voltage
100 VDC for 100 ms.
Reverse Voltage Protection
None
Startup & Shutdown Voltage
Remote On/Off
(36) VDC @ 48 Vin; 18VDC @ 24Vin
Enable
Open Circuit
I sink < 0.1ma,
Inhibit,
< 0.5 VDC
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Product Data Sheet
Output Specifications
Voltage Variance/Regulation
3.3 ± 0.1 VDC
5.0 ± 0.15 VDC
12.0 ± 0.24 VDC
Output Adjustable
Yes
Ripple & Noise
100 mv P-P (Max)
20 MHz Bandwidth
Transient Response
< 0.3 ms.
± 25% from 10% to 100% of rated load
± 5% voltage deviation
Load Current
Maximum
6.0 Amps @ 3.3 VDC
4.0 Amps @ 5 VDC
1.8 Amps @ 12 VDC
Minimum
0 Amps
Short Circuit Protection
Continuous
Power Output
20 Watts
Overvoltage Protection
4.3 VDC, 3.3 VDC Output
6.2 VDC, 5.0 VDC Output
15.0 VDC, 12.0 VDC Output
GENERAL SPECIFICATIONS
Isolation
1500 VDC
Operating Temperature (Ambient Air)
-25 to + 71°C
Thermal Resistance (ca) Case to Ambient
11.5°C/W Typical
Storage Temperature
-25 to +100°C
Thermal Shutdown (TS Models Only)
+95°C
SELECTION GUIDE
Device
Type
20B24R5S
20B48R3.3S
20B48R3.3TS
20B48R5S
20B48R12LP
Input Volts
18 - 36
36 - 72
36 - 72
36 - 75
18 - 72
Input Current
A (Max)
1.068
0.520
0.520
0.534
0.536
Output
Voltage
4.85 - 5.15
3.20 - 3.40
3.20 - 3.40
4.85 - 5.15
11.76 - 12.24
Output Current
A (Max)
4.0
6.0
6.0
4.0
1.8
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Pin Connections
Pin Connection
1 + V Input
2 – V Input
3 No pin
4 Enable
5 No Pin
6 + V Output
7 V Return
8 Adjust
Notes:
1. All dimensions in
parentheses are
metric
2. Tolerances unless
otherwise specified:
.xx ± .03 (.76)
.xxx ± .015 (.38)
3. Height of the
20B48R12LP is .400"
(10.16)
Product Data Sheet
Mechanical Specification (dimensions in inches)
(see note 3)
Reliability Power Locations
HEADQUARTERS & CUSTOMER SERVICE SALES
Reliability Power, Incorporated
Reliability Power, Incorporated
33 Musick
Attention: SALES
Irvine, CA 92618 USA
Tel: (949) 305-6700
Tel: (805) 449-1667
Fax: (949) 305-6701
Fax: (805) 557-4530
www.reliabilitypower.com
sales@reliabilitypower.com
Copyright© 2000-2006, Reliability Power Inc. Reliability Power Inc. reserves the right to make changes in the product at any time, without notification.
20 Watt.doc 10 May 2006
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