OCP2576 Regulator Datasheet

OCP2576 Datasheet, PDF, Equivalent


Part Number

OCP2576

Description

Simple Switch 3A Step-down Voltage Regulator

Manufacture

ORIENT-CHIP

Total Page 9 Pages
Datasheet
Download OCP2576 Datasheet


OCP2576
OCP2576
Simple Switch 3A Step-down Voltage Regulator
„ Features
„ General Description
z Output voltage: 3.3V, 5V, 12V, 15V and adjustable The OCP2576 series of regulators are monolithic IC
output versions
that provide all the active function for a step-down
z Adjustable version output voltage range:1.23V to (buck) switching regulator, capable of driving 3A load
30V±4% max over line and load conditions
with excellent line and load regulation. These
z Guaranteed 3A output current
devices are available in fixed output voltages of
z Input voltage up to 36V
3.3V, 5V, 12V, 15V and an adjustable output version.
z
z
z
z
z
Requires only 4 external components
52KHz fixed frequency internal oscillator
TTL shutdown capability, low power standby mode
High efficiency
Thermal shutdown and current limit protection
Requiring a minimum number of external
components, these regulators are simple to use and
include internal frequency compensation and a fixed
frequency oscillator.
A standard series of inductors optimized for use with
„ Applications
z Simple High-efficiency step-down regulator
z Efficient pre-regulator for linear regulators
z Positive to negative converter(Buck-Boost)
the OCP2576 are available from several different
manufacturers. This feature greatly simplifiers the
design of switch-mode power supplies.
Others features include a guaranteed ±4% tolerance
on output within specified input voltages and output
load conditions, and ±10% on the oscillator
frequency. External shutdown in included, featuring
50μA (typical) standby current. The output switch
includes cycle-by-cycle current limiting, as well as
thermal shutdown for full protection under fault
conditions.
„ Pin Configuration
(1) TO220-5L
(Top View)
Metal Tab Gnd
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
Symbol
1
2
3
4
5
Name
Vin
Output
Gnd
FB
SD
Descriptions
Operating Voltage Input
Switching Output
Ground
Output Voltage Feedback Control
ON/OFF Shutdown
(2) TO263-5L
(Top View)
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
Metal Tab Gnd
Page1-9
Rev. 1.3 Mar. 02, 2006

OCP2576
OCP2576
Simple Switch 3A Step-down Voltage Regulator
„ Block Diagram
UNREGULATED
DC INPUT
VIN
FEED-
CIN + BACK
1
4
INTERNAL
REGULATOR
R2
R1
1.0K
FIXED GAIN
ERROR AMP
+
-
COMPARATOR
+
-
1.23V
BAND-GAP
REFERANCE
52KHz
OSCILLATOR
RESET
ON/OFF
3 AMP
SWITCH
DRIVER
THERMAL
SHUTDOWN
CURRENT
LIMIT
ON/OFF
5
OUTPUT
2
L1
VOUT
GND D1
+
3 COUT
3.3V: R2=1.7K 5V: R2=3.1K 12V: R2=8.4K
15V: R2=11.3K For Adjustable R2=0KR1=open
„ Pin Functions
VIN
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at
this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
Ground
Circuit ground.
Output
Internal switch, the voltage at this pin switches between (VIN – VSAT) and approximately – 0.5V.To minimize
coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept to a minimum.
Feedback
Senses the regulated output voltage to complete the feedback loop.
ON/OFF
Allows the switching regulator circuit to be shut down using logic level signals. Pulling this pin below a threshold
voltage of approximately 1.5V turns the regulator on, and pulling this pin above 1.51V (up to a maximum of 25V)
shuts the regulator down. If this shutdown feature is not needed, the ON/OFF pin can be wired to the ground pin
or it can be left open, in either case the regulator will be in the ON condition.
Page2-9
Rev. 1.3 Mar. 02, 2006


Features OCP2576 Simple Switch 3A Step-down Volta ge Regulator „ Features „ General D escription z Output voltage: 3.3V, 5V, 12V, 15V and adjustable The OCP2576 se ries of regulators are monolithic IC o utput versions that provide all the ac tive function for a step-down z Adjust able version output voltage range:1.23V to (buck) switching regulator, capable of driving 3A load 30V±4% max over l ine and load conditions with excellent line and load regulation. These z Gua ranteed 3A output current devices are available in fixed output voltages of z Input voltage up to 36V 3.3V, 5V, 12 V, 15V and an adjustable output version . z z z z z Requires only 4 external components 52KHz fixed frequency intern al oscillator TTL shutdown capability, low power standby mode High efficiency Thermal shutdown and current limit prot ection Requiring a minimum number of e xternal components, these regulators ar e simple to use and include internal fr equency compensation and a fixed frequency oscillator. A standard .
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