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CS5101-CS5101EDW16
Secondary Side Post Regulator for AC/DC and DC/DC Multiple Output Converters
CS5101AN/D
Secondary Side Post
Regulator (SSPR) for
Switching Power Supplies
with Mulitple Outputs
This application note describes the common post regulation methods used in power supply design and introduces the CS5101
Secondary Side Post Regulator Control IC. It also shows a detailed design example of a dual output, current mode control,
forward converter using the CS3842A and CS5101 controllers.
IntroductionIn Switch Mode Power Supplies (SMPS) a transformer
provides isolation between the primary source and the
secondary load(s). If the SMPS controller is located on the
primary side of the transformer, the feedback voltage from
the secondary is fed back to the primary side through another
isolation barrier, usually an opto coupler.
Tight output regulation is more difficult in multiple output
power supplies. The following are the most popular
techniques.
1.The Linear Regulator, Figure 1, is the simplest and the
most popular for low current (3.0 A) applications.
The major disadvantage of the linear regulator is its
poor efficiency.
2.A Step–Down Buck Regulator, Figure 2, can be used as
a post regulator. Efficiencies up to 90% can be
achieved by using this method. This solution looks
very attractive in the low and medium power range
(3.0 A to 8.0 A). However, several additional high
cost components are required, including, a power
switch, inductor and capacitors.
3.A Magnetic Amplifier Post Regulator, Figure 3, offers
high efficiency and tight regulation for
currents greater than 5.0 A .
Its drawbacks include: the difficulty in
implementing overcurrent protection, poor regulation
characteristics at light or no load conditions and the
cost of
amplifier inductor.
4.A Secondary Side Post Regulator (SSPR), Figure 4, uses
a semiconductor switch with either leading edge
(delayed turn–on) or trailing edge (delayed turn–off)
modulation.
An SSPR provides excellent regulation, high
efficiency,
overcurrent protection and remote ON/OFF control.
VIN
VSY
LO1
LO2
Figure 1. Linear Regulator
