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PDF AS1003 Data sheet ( Hoja de datos )
| Número de pieza | AS1003 | |
| Descripción | PWM Buck Converter | |
| Fabricantes | Anisem | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS1003 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AS1003
FEATURES
Precision feedback reference voltage: 0.5V (2%)
Wide supply voltage operating range: 3.6 to 20V
Low current consumption: 3.0mA
Internal fixed oscillator frequency: Typ. 360KHz
Programmable Soft-Start function (SS)
Short Circuit Shutdown and Auto Re-start
function(ARSCP)
Built-in P-MOSFET for 3A loading capability
Package: SOP8
360KHz, 3A PWM Buck Converter
GENERAL DESCRIPTION
The AS1003 is a buck topology of switching regulator
for wide operating voltage applications field. The
AS1003 includes a high current P-MOSFET, high
precision reference (0.5V) for comparing output voltage
with feedback amplifier, an internal dead-time control
and oscillator for controlling the maximum duty cycle
and PWM frequency, and has power-on programmable
soft start time and short circuit PMOS turn-off and auto
re-start protection functions.
APPLICATIONS
PC Monitors
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators
TYPICAL APPLICATION
Figure1. 12V to 3.3V/2A Typical Application Circuit
EFFICIENCY
100
VOUT=5.0V
95
90
85
80
75
70
0.5
VOUT=3.3V
VIN=12V
TA=25℃
1 1.5 2 2.5
LOAD CURRENT(A)
3
AS1003 Preliminary _08/03/08
www.anisem.com
1
1 page  
TIMING WAVEFORM
3.6V
VCC
AS1003
360KHz, 3A PWM Buck Converter
S.S/ARSCP
VSST
ARSCP
Charge
Current
VARSCP
Soft Start Stage
COMP
Tre
OSC
LX
~~
Restart Timing
~~
Hold Stage
~~
Restart Timing
~~
Soft Start Stage
0.8V
ARSCP Charge Current
ARSCP
VARSCP
OSC
LX
Tre
Hold Stage
AS1003 Preliminary _08/03/08
www.anisem.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AS1003.PDF ] | |
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