Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
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
Feedback
4
PL2576
+Vin
1
Fixed Output
Vout
L1
Output
2
μ
100
H
Vin
Cin
100
Unregulated
DC Input
+
+
Cout
1000
GND
3
ON / OFF
5
L
μ
F
D1
MBR360
μ
F
O
A
D
μ
Cin--100 F, 75V, Aluminum Electrolytic
μ
Cout--1000 F, 25V, Aluminum Electrolytic
D1--Schottky, MBR360
μ
L1--100 H, Pulse Eng, PE92108
R1--2k, 0.1%
R2--6.12k, 0.1%
Adjustable Output Voltage Version
Feedback
4
+Vin
PL2576-ADJ
Vout
1
L1
Output
2
5.00V
μ
100
H
7V-40V
R2
R1
Unregulated
DC Input
+
+
Cin
100
Cout
1000
GND
3
ON / OFF
5
L
D1
MBR360
μ
F
μ
F
O
A
D
R2
R1
Vout=VREF(1+
Vout
)
-1)
R2=R1(
VREF
where VREF=1.23V, R1 between 1k and 5k
Figure 2
PL2576-XXXF5
CYStek Product Specification
CYSTEKEC [ CYSTECH ELECTONICS CORP. ]
