0.5A Step-Down Switching Regulator
TC2574
The TC2574–ADJ Step-Down Voltage Regulator with 5.0V @ 0.5A Output Power Capability.
Typical Application with Through-Hole PC Board Layout
Feedback
Unregulated
DC Input
1
+V
IN
L1
330µH
L2
22µH
TC2574–ADJ
Regulated
Output Filtered
5
+V = 7.0 to 40 V
in
Output
V
7
OUT = 5.0 V @ 0.5 A
4
Pwr
GND
2
Sig
GND
3
ON/OFF
R2
6.12 k
W
C3
100µF
C1
22µF
C2
220µF
D1
1N5819
R1
2.0 kW
GND
GND
C1 – 22µF, 63V, Aluminum Electrolytic
C2 – 220µF, 16V, Aluminum Electrolytic
C3 – 100µF, 16V Aluminum Electrolytic
D1 – 1.0A, 40V, Schotty Rectifier, 1N5829
L1 – 330µH, RL–1284–330, Renco Electronics
L2 – 25µH, SFT52501, TDK
Output
Ripple Filter
R1 – 2.0kΩ, 0.1%, 0.25W
R2 – 6.12kΩ, 0.1%, 0.25W
Figure 20. Schematic Diagram of the 5.0V @ 0.5A Step-Down Converter Using the TC2574–ADJ
(An additional LC filter is included to achieve low output ripple voltage)
TC2574
+
C1
+V
IN
C2
C3
GND
U1
+
+
D1
R1 R2
L2
GND
V
OUT
L1
NOTE: Not to scale.
NOTE: Not to scale.
Figure 21. PC Board Layout Component Side
Figure 22. PC Board Layout Copper Side
TC2574-1 1/6/00
20
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
