SERIES UWD
UNIVERSAL AC-DC SWITCHING POWER SUPPLIES

Hi Reliability
Industrial Grade
Input Voltage (85 - 265V AC, 47 - 440Hz)
Isolated  1500 VRMS
Fully Regulated -- Up to 50 Watts
Short Circuit Protected

This series of switching AC-DC power supplies are available in 13 different models.  All single and dual outputs are isolated and offer excellent line and load regulation.  These units have continuous short circuit protection and will operate from 0ºC to +85ºC baseplate.  The hi reliability UWD Series, up to 50 Watts, is the design choice for your most stringent industrial applications.

Typical Characteristics:
  • Test Conditions:  25ºC Ambient
  • Input Voltages:  85 - 265V AC, 47 - 440Hz
  • Converter Frequency:  100KHz
  • Operating Temperature:  0ºC to +85ºC baseplate
  • Storage Temperature:  -55ºC to +105ºC baseplate
  • Output Voltage Temperature Coefficient:  0.02% per 0ºC
  • Isolation:  1500VRMS
  • Electrolytic Capacitor: 120µF, 400V or greater required or damage will occur.
 Features:
  • Excellent Line Regulation: ±1% (85 - 265V AC)
  • Excellent Load Regulation: 10% - 100%, ±2%
  • Continuous Short Circuit Protection
  • Encapsulated Semiconductors: Conservatively rated for maximum reliability
  • Wide Input Range:85 - 265V AC, 47 - 440Hz
  • Expanded Operating Temperature:  Consult Factory

SERIES UWD - SINGLE OUTPUT - 50 WATTS MAX.

PICO
PART
NUMBER
OUTPUT
VOLTAGE
(VDC)
MAX.
LOAD
CURRENT
(A)
MAX.
OUTPUT
POWER
(watts)***
EFF. @
FULL
LOAD
TYPICAL
(%)*
OUTPUT
VOLTAGE
Tolerance
(±%)**
LOAD
Regulation
10%-100%
LOAD
(±%)**
LINE
Regulation
@ FULL
LOAD
(±%)
OUTPUT
VOLTAGE
RIPPLE
TYPICAL
(mv p-p)*
PRICE
UWD3.3S
3.3
9.09
30
68
2
2
1
75
166.88
UWD5S
5
8.00
40
74
2
2
1
75
166.88
UWD5.2S
5.2
7.70
40
74
2
2
1
75
166.88
UWD12S
12
4.16
50
80
2
2
1
75
166.88
UWD15S
15
3.33
50
80
2
2
1
75
166.88
UWD24S
24
2.08
50
84
1
1
1
75
166.88
UWD28S
28
1.79
50
85
1
1
1
75
166.88
UWD48S
48
1.04
50
85
1
1
1
75
166.88
*Measurement taken at 115V AC at 60Hz
**10% minimum load required at all times
***Using proper thermal management, maximum baseplate temperature of +85ºC
 
 

SERIES UWD - DUAL OUTPUT - 50 WATTS MAX.

PICO
PART
NUMBER
OUTPUT
VOLTAGE
(VDC)
MAX.
LOAD
CURRENT
PER
OUTPUT
(A)
MAX.
OUTPUT
POWER
PER
OUTPUT
(watts)***
EFF. @
FULL
LOAD
TYPICAL
(±%)*
OUTPUT
VOLTAGE
Tolerance
(±%)**
LOAD
Regulation
10%-100%
LOAD
****
(±%)**
LINE
Regulation
@ FULL
LOAD
(±%)
OUTPUT
VOLTAGE
RIPPLE
TYPICAL
(mv p-p)*
PRICE
UWD5D
±5
4.00
20
75
2
2
1
75
181.44
UWD12D
±12
2.08
25
80
2
2
1
75
181.44
UWD15D
±15
1.66
25
80
2
2
1
75
181.44
UWD24D
±24
1.04
25
84
2
2
1
75
181.44
UWD28D
±28
0.892
25
84
2
2
1
75
181.44
*Measurements taken at 115V AC at 60Hz
**10% minimum load required at all times
***Using proper thermal managment, maximum baseplate temperature of +85ºC
****Balanced loads
 
 
 

SERIES UWD SINGLE OUTPUT

SERIES UWD DUAL OUTPUT
C - External electrolytic 120 uF 400 V DC capacitor or greater must be installed before operation C- External electrolytic 120 uF 400V DC capacitor or greater must be installed before operation

 

THERMAL CONSIDERATIONS FORMULA

Tc - Ta = /\T = Trca Pout (¹/n -1) where,
Trca = Thermal Resistance of case to air
Pout =  Output Power in Watts
n = Efficiency
Tc = Case temperature in ºC
Ta = Ambient Temperature in ºC
 

Table 1
Trca
UWD SERIES
Baseplate
Heatsink LCV
Heatsink LCH
Free Air
7.9
4.2
4.0
200 LFM
4.9
1.6
1.6
400 LFM
2.5
1.6
1.3
600 LFM
2.2
0.9
0.9
800 LFM
1.5
0.7
0.7
1000 LFM
1.2
0.6
0.6

 
 
 
Example 1:
A UWD24S module has an efficiency of 78%.  What is the maximum ambient temperature if 50 Watts of power is needed?

A) In free air.
               From Table 1:  Trca =7.9
               Using relation (2)
           /\T=7.9(50)[¹/.78 -1] = 111.4ºC

               Ta = 85-114.4 = -26.4ºC

B) In free air with heatsink LCV
               Trca=4.2
           /\T=4.2(50)[¹/.78 -1] = 59.2ºC

               Ta = 85-59.23 = 25.8ºC

C) With 400 LFM of air flow.
               Trca = 2.5
           /\T=2.5(50)[¹/.78 -1] = 35.3ºC

               Ta = 85-35.3 = 49.7ºC
 

 Example 2:
What would be the maximum output power for a UWD24S module at an ambient temperature of 50ºC with and efficiency of 78%?

A) If the module is used in free air.
               From Table 1:  Trca = 7.9
               Using relation (2)
               85-50 = 7.9 Pout[¹/.78 -1]
               Pout = 35/7.9(.282) = 16W

B) If the module with heatsink LCV is used with free air.

               Trca = 4.2
               Pout = 35/4.2(.282) = 30W

C)  If the module is used in an area with forced air at 400 LFM with no heatsink.

               Trca = 2.5
               Pout = 35/4.2(.282) = 49.6W


For immediate Engineering Assistance:

Call Toll Free: 800-431-1064



PICO Electronics, Inc.
143 Sparks Avenue
Pelham, N.Y. 10803-1837
Tel: 914-738-1400
Fax: 914-738-8225

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