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PDF SC1103 Data sheet ( Hoja de datos )

Número de pieza SC1103
Descripción Asynchronous Voltage Mode PWM Controller
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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No Preview Available ! SC1103 Hoja de datos, Descripción, Manual

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




SC1103 pdf
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

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