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دیتاشیت - Semtech Corporation - Synchronous Voltage Mode Controller

شماره قطعه SC2602A
شرح مفصل Synchronous Voltage Mode Controller
تولید کننده Semtech Corporation 
آرم Semtech Corporation 


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SC2602A شرح
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SC2602/SC2602A
Synchronous Voltage Mode Controller
for Distributed Power Supply Applications
POWER MANAGEMENT
Description
Features
The SC2602 and SC2602A are low-cost, full featured,
synchronous voltage-mode controllers designed for use
in single ended power supply applications where efficiency
is of primary concern. Synchronous operation allows for
the elimination of heat sinks in many applications. The
SC2602s are ideal for implementing DC/DC converters
needed to power advanced microprocessors in low cost
systems, or in distributed power applications where effi-
ciency is important. Internal level-shift, high-side drive
circuitry, and preset shoot-thru control, allows the use of
inexpensive N-channel power switches.
SC2602s features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling, shut-
down, and over voltage protection are also provided.
‹ Synchronous operation for high efficiency (95%)
‹ RDS(ON) current sensing
‹ On-chip power good and OVP functions
‹ Small size with minimum external components
‹ Soft Start
‹ Enable function
Applications
‹ Microprocessor core supply
‹ Low cost synchronous applications
‹ Voltage Regulator Modules (VRM)
‹ DDR termination supplies
‹ Networking power supplies
‹ Sequenced power supplies
The SC2602 operates at a fixed 200kHz and the
SC2602A at 500kHz, providing a choice for optimum
compromise between efficiency, external component size,
and cost.
Two SC2602s can be used together to sequence power up
of telecom systems. The power good of the first SC2602
connected to the enable of the second SC2602 makes
this possible.
Typical Application Circuit
Typical Distributed Power Supply
+5V
R1 R2
1k
PWRGD
0.1
OVP
C1
0.1 C2
0.1
R3
1k
R4
10 U1
SC2602
1 VCC
GND
2 PWRGD SS/SHDN
3 OVP
COMP
14
C3
13 0.1
4.99K
12
4 OCSET
SENSE
11
5
D1
MBR0520 6
PHASE
DRVH
BST H
BST L
10
9
7 PGND
DRVL
8
820pF
C4
1.0
SHDN
+12V
R5
3.9
R6
2.2
Figure 1.
+
VinC5 C6 C7 C8
10.0 680/6.3V 680/6.3V 680/6.3V
_ 5V
Q1
STP40NE
Q2
STP40NE
R8
124*
R7
127
L2u1H
+
C9
180/4V
C10
180/4V
C11
180/4V
C12
180/4V
C13
180/4V
Vout=2.5V
_*
NOTE:
*) Vout = 1.265 x (1+R8/R7)
Revision: October 13, 2004
1
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