NIKO-SEM
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
FEATURES
N2576
TO-263, TO220
GENERAL DESCRIPTION
The N2576 Series switching voltage
regulators (SVR) are monolithic integrated
circuits that provide all the active functions
for a step-down (buck) switching regulator,
B o t h s e r ie s a re ca p a b l e o f d r i v i n g
3 A load respectively with excellent line and
load regulation.
The N2576 Series SVR include a switching
regulator and compensation network all
within the same package. Just add a choke,
catch diode and two capacitors to obtain an
efficient DC-to-DC converter. The output
switch includes cycle-by-cycle current limit
-ing, as well as thermal shutdown for full
protection under fault conditions.
The N2576 Series SVR offer replacement
for popular 3 terminal linear regulators by
providing higher efficiency with reduced
heat sink size. In many applications a heat
sink will not be required.
Pin compatible with industry products of
LM2576 Series
Adjustable output versions
Wide output voltage range, 1.23V to 27V
for adjustable output version
DC-to-DC buck converter requiring only 4
external parts
52 KHz fixed frequency internal oscillator
TTL shutdown capability, low power stand
-by mode
High efficiency
Uses readily available standard inductors
APPLICATIONS
Simple high-efficiency step-down (buck)
regulator
Positive to negative converter (Inverting
Buck-Boost)
Isolated Fly back Converter using mini-
mum number of external parts
Powering portable instrument, Set-Top
Box, LCD Monitor, Scanner, I.A, Easy PC
SMPS Post-Regulator
TYPICAL APPLICATION
8V - 27V
Unregulated
DC Input
1
+Vin
3
Gnd
Cin
100uF
+
D1
1N5822
4
N2576
2
5
On/Of f
100uH
R1
6.18K
+
Cout
1000uF
R2
2K
Feedback
Output
L1
+5V, 3A
Regulated
Output
* V
OUT
= 1.23V ( 1 + R1 / R2)
Adjustable Regulator in Fixed Output Application
1
MAY-31-2001
DSP and ARM Processors
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EEWORLD
