RD7 Просмотр технического описания (PDF) - Power Integrations, Inc

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RD7

TOPSwitch-II® PC Standby Reference Design Board 90 to 375 VDC Input, 3.5 W Output

Power Integrations, Inc 

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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