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Número de pieza | SC1103CS | |
Descripción | Asynchronous Voltage Mode PWM Controller | |
Fabricantes | Semtech Corporation | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de SC1103CS (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
No Preview Available ! POWER MANAGEMENT
Description
The SC1103 is a versatile, low-cost, voltage-mode PWM
controller designed for 12V input DC/DC power supply
applications. A simple, fixed-voltage buck regulator can
be implemented using the SC1103 with a minimum of
external components. Internal level shift and drive
circuitry eliminates the need for an expensive p-channel,
high-side switch. The small device footprint
allows for compact circuit design.
SC1103 features include a temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, frequency shift over-current protection, and
an internally compensated error amplifier. Pulse by pulse
current limiting is implemented by sensing the
differential voltage across an external resistor, or an
appropriately sized PC board trace.
The SC1103 operates at a fixed frequency of 200kHz,
providing an optimum compromise between efficiency,
external component size, and cost.
SC1103
Asynchronous Voltage Mode PWM
Controller for 12V Input
Features
Low cost / small size
Switch mode efficiency up to 95%
1% reference voltage accuracy
Over current protection
500mA output drive
5V to 12V Input power source
Lead free package available. Fully WEEE and RoHS
compliant
Applications
Pentium® P55 Core Supply
Low Cost Microprocessor Supplies
Peripheral Card Supplies
Industrial Power Supplies
High Density DC/DC Conversion
Typical Application Circuit
+12V
Q1
IRLR3103
L1 R5
6uH 0.05
GND
C1
1.0
C2
C3
47/16V 47/16V
D2
MBRD1035L
+20V
R1
10 R2 R3
1k 1k
U1
SC1103
C6 R4
1 VCC
GND 8
0.01
2.2
2 CS(-)
FB 7
C4 C5
0.1
0.001
3 CS(+)
BST 6
4 PGND
DH 5
C7
0.1
* NOTE:
R6 = R7 x (Vout/1.25 - 1) rounded to nearest 1%value
12V to 3.3V @ 10A with “flying capacitor” boost voltage.
Revision: July 28, 2005
1
C8
220/4V
C9
220/4V
C10
220/4V
Vout = 2.5V @ 10A
+
R6
C11 127*see note
1.0
R7
127
GND
www.semtech.com
1 page POWER MANAGEMENT
Applications Information (Cont.)
Layout diagram for the SC1103
VO = VREF (1 + Ra/Rb)
20-24V BST
12VIN
SC1103
10
0.1uF
0.001uF
SC1103CS
1 VCC
8
GND
2 CS(-)
FB 7
3 CS(+) BST 6
4 PGND
DH 5
Heavy lines indicate
high current paths.
Q1 Cin +
Rb
D1
6uH
Ra
Cout
+
Vout
Application Circuit
12V to 2.5V @ 10A (Bootstrapped)
D1
LL4148
+12V
GND
C1
1.0
C2
C3
47/16V 47/16V
C7
0.1
Q1
IRLR3103
L1 R5
6uH 0.05
D2
MBRD1035L
C8
220/4V
C9
220/4V
C10
220/4V
C11
1.0
+
R6
76.8 *see note
Vout = 2.5V @ 10A
R7
127
GND
R1
10 R2 R3
1k 1k
U1
SC1103
C6 R4
1 VCC
GND 8
0.01
2.2
2 CS(-)
FB 7
C4 C5
0.1
0.001
3 CS(+)
BST 6
4 PGND
DH 5
* NOTE:
R6 = R7 x (Vout/1.25 - 1) rounded to nearest 1%value
2005 Semtech Corp.
5
www.semtech.com
5 Page |
Páginas | Total 7 Páginas | |
PDF Descargar | [ Datasheet SC1103CS.PDF ] |
Número de pieza | Descripción | Fabricantes |
SC1103CS | Asynchronous Voltage Mode PWM Controller | Semtech Corporation |
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