FSP3123 Datasheet, PDF (1/11 Pages) FOSLINK SEMICONDUCTOR CO.,LTD – 150KHZ 3A PWM BUCK DC/DC CONVERTER

150KHZ 3A PWM BUCK DC/DC CONVERTER
„ FEATURES
z Output voltage: 3.3V, 5.0V, 12V, and adjustable
output version
z Adjustable version output voltage range:1.23V to
18V±4%
z 150KHz±15% fixed switching frequency
z Voltage mode non-synchronous PWM control
z Thermal-shutdown and current-limit protection
z ON/OFF shutdown control input
z Operating voltage can be up to 22V
z Output load current: 3A
z Low power standby mode
z Built-in switching transistor on chip
z TO220-5L，TO263-5L and PDIP8L packages
„ APPLICATIONS
z Simple High-efficiency step-down regulator
z On-card switching regulators
z Positive to negative converter
„ PIN CONFIGURATION
(1) TO220-5L
(Top View)
FSP3123
„ GENERAL DESCRIPTION
The FSP3123 series are monolithic IC that design for
a step-down DC/DC converter, and own the ability of
driving a 3A load without additional transistor
component. Due to reducing the number of external
component, the board space can be saved easily.
The external shutdown function can be controlled by
logic level and then come into standby mode. The
internal compensation makes feedback control have
good line and load regulation without external design.
Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. If current limit function occurred and
V_FB is down to 0.5V below, the switching frequency
will be reduced. The FSP3123 series operates at a
switching frequency of 150 KHz thus allowing smaller
sized filter components than what would be needed
with lower frequency switching regulators. Other
features include a guaranteed ±4% tolerance on
output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 5-lead TO-220 package, a
5-lead TO-263 package or 8-lead PDIP.
(2) TO263-5L
(Top View)
Metal Tab Gnd
(3) PDIP8L
(Top View)
GND GND GND GND
8
7
6
5
1
2
3
4
VIN OUTPUT FB SD
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
Metal Tab Gnd
Symbol
TO220/TO263 PDIP
1
1
2
2
3
5~8
4
3
5
4
Name
Descriptions
Vin
Output
Gnd
FB
SD
Operating Voltage Input
Switching Output
Ground
Output Voltage Feedback Control
ON/OFF Shutdown
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2007-6-12