PL2576-XXXF5 Datasheet, PDF (9/10 Pages) Cystech Electonics Corp. – Simple Switcher 3A Step- Down Voltage Regulator

Spec. No. : C543F5
CYStech Electronics Corp. Issued Date : 2004.02.27
Revised Date :
Page No. : 9/10
Test Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring
inductance generate voltage transients which can cause problems. For minimal inductance and ground
loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point
grounding (as indicated) or ground plane construction should be used for best results. When using the
Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive
feedback wiring short.
Fixed Output Voltage Versions
+Vin
PL2576
1
Fixed Output
Vin
Unregulated
DC Input
+ ^Cin
100μF
GND 3 ON / OFF 5
Feedback
4
Output
2
L1
100μH
D1
MBR360
Vout
+ _Cout
1000μF
L
O
A
D
Cin--100μF, 75V, Aluminum Electrolytic
Cout--1000μF, 25V, Aluminum Electrolytic
D1--Schottky, MBR360
L1--100μH, Pulse Eng, PE92108
R1--2k, 0.1%
R2--6.12k, 0.1%
Adjustable Output Voltage Version
+Vin
PL2576-ADJ
1
7V-40V
Unregulated
DC Input
+ Cin
100μF
GND 3 ON / OFF ₅
Feedback
4
Output
2
L1
100μH
D1
MBR360
+ _Cout
1000μF
Vout
5.00V
R2
L
O
A
R1 _D
R2
Vout=VREF(1+ )
R1
Vout
R2=R1(
-1)
VREF
where VREF=1.23V, R1 between 1k and 5k
Figure 2
PL2576-XXXF5
CYStek Product Specification