SC1101
SC1101 is Asynchronous Voltage Mode PWM Controller manufactured by SEMTECH.
POWER MANAGEMENT Description
The SC1101 is a versatile, low-cost, voltage-mode PWM controller designed for low output voltage DC/DC power supply applications. A simple, fixed-voltage buck regulator can be implemented using the SC1101 with a minimum of external ponents. Internal level shift and drive circuitry eliminates the need for an expensive p-channel, high-side switch. The small device footprint allows for pact circuit design.
Asynchronous Voltage Mode PWM Controller
Features
Low cost / small size Switch mode efficiency up to 95% 1% reference voltage accuracy Over current protection 500m A output drive SO-8 package
SC1101 Features include a temperature pensated voltage reference, triangle wave oscillator, current limit parator, frequency shift over-current protection, and an internally pensated 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.
Applications
Pentium® P55 Core Supply Low Cost Microprocessor Supplies Peripheral Card Supplies Industrial Power Supplies High Density DC/DC Conversion
The SC1101 operates at a fixed frequency of 200k Hz, providing an optimum promise between efficiency, external ponent size, and cost.
Typical Application Circuit
+5V
Q1 IRLR3103
L1 R5 4u H 0.05
C1 1.0
C2
C3
150/6.3V 150/6.3V
D2 MBRD1035L
+12V
R1 10
C4 0.1
R2 R3 1k 1k
U1 SC1101
C6
1 VCC
GND 8
C5 0.001
2 CS(-) 3 CS(+) 4 PGND
FB 7 BST 6 DH 5
C7...
