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| 型號(hào)： | SYNCHRONOUS |
| 英文描述： | Synchronous DC/DC Controller for Distributed Power Applications (131k) |
| 中文描述： | 同步DC / DC對(duì)于分布式電源應(yīng)用（131k控制器） |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 131K |
| 代理商： | SYNCHRONOUS |
AN99-7
Synchronous DC/DC Controller for
Distributed Power Supply Applications
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
January 4, 2000
1
BLOCK DIAGRAM
APPLICATION NOTE FOR SC1102
INTRODUCTION
DESCRIPTION
The SC1102 is a low-cost, full featured, syn-
chronous voltage-mode controller designed
for use in single ended power supply applica-
tions where efficiency is of primary concern.
Synchronous operation allows for the elimi-
nation of heat sinks in many applications.
The SC1102 is ideal for implementing DC/DC
converters needed to power advanced micro-
processors in low cost systems, or in dis-
tributed power applications where efficiency
is important. Internal level-shift, high-side
drive circuitry, and preset shoot-thru control,
allows the use of inexpensive N-channel
power switches.
SC1102 features include temperature com-
pensated voltage reference, triangle wave os-
cillator and current sense comparator cir-
cuitry. Power good signaling, shutdown, and
over voltage protection are also provided.
The SC1102 operates at a fixed 200kHz, pro-
viding an optimum compromise between effi-
ciency, external component size, and cost.
The SC1102’s manufacturing process has
been optimized for 12V operation and is
capable of handling up to 26V at it’s BST
pin.
APPLICATIONS
Microprocessor core supply
Low cost synchronous applications
Voltage Regulator Modules (VRM)
FEATURES
1.265V Reference available
Synchronous operation
Over current fault monitor
On-chip power good and OVP functions
Small size with minimum external compo-
nents
Soft Start
R
DS(ON)
Current sensing
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