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RD7 Datasheet, PDF (1/12 Pages) Power Integrations, Inc. – PC Standby Reference Design Board 90 to 375 VDC Input, 3.5 W Output
RD7
®
TOPSwitch®-II
PC Standby Reference Design Board
90 to 375 VDC Input, 3.5 W Output
Product Highlights
Low Cost Production Worthy Reference Design
• Up to 3.5 W of output power
• Meets Blue Angel requirements (5 W)
• Single sided board
• Low cost through-hole components
• Fully assembled and tested
• Easy to evaluate and modify
• Extensive performance data
• Light weight - no heat sink required for TOPSwitch-II
• Non-isolated +12 V output option
Fully Protected by TOPSwitch-II
• Primary safety current limit
• Output short circuit protection
• Thermal shutdown protects entire supply
Designed for World Wide Operation
• Designed for IEC/UL safety requirements
• Designed for wide range of input voltage
Typical Applications
• Desktop PC stand-by power supply (PS98, ATX, NLX,
SFX, Micro ATX)
• Consumer stand-by supply (e.g. TV, VCR, DVD)
Description
The RD7 reference design board is an example of a very low
cost production worthy DC input standby power supply design
using the TOPSwitch-II family of Three-terminal Off-line
PWM switchers. The reference design board is intended to help
TOPSwitch-II users quickly develop their products. It provides
a basic design that can be easily modified to fit a particular
application. The RD7 operates from a rectified and filtered AC
mains voltage and provides 3.5 W output at 5 V. Features such
as a 12 V non-isolated output or tighter output voltage tolerance
may be implemented by changing only a few components (See
Figure 4).
1.19 in.
(29 mm)
2 in. (48 mm)
.75 in.
(18 mm)
Figure 1. RD7 Overall Physical Dimensions.
PI-2271-062998
PARAMETER
LIMITS
Input Voltage Range
90 to 375 VDC
Temperature Range
0 to 50° C
Output Voltage (Io = 0.7 A)
5 V ± 5%
Output Power (continuous)
3.5 W
Line Regulation (90-375VDC)
± 1.0%
Load Regulation (10%-100%)
± 1.0%
Efficiency (At full load)
72%
Output Ripple Voltage
± 50 mV
Safety
IEC950/UL1950
Table 1. Table of Key Electrical Parameters.
April 1999
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