TC2575 Datasheet, PDF (20/25 Pages) TelCom Semiconductor, Inc – 1.0A Step-Down Switching Regulator

1.0A Step-Down Switching Regulator
TC2575
Unregulated
DC Input
+VIN
1
TC2575-ADJ
Feedback
4
Output
L1
150µH
L2
20µH
Output
Voltage
CIN
100µF/50V
3 _GND
2
5 _ON/OFF
1.2V to 35V @1.0A
R2
50k
D1
1N5819
COUT
2200µF
R1
C1
100µF
1.1k
Optional Output
Ripple Filter
Figure 16. Adjustable Power Supply with Low Ripple Voltage
The TC2576-ADJ Step-Down Voltage Regulator with 8.0V @ 1.0A Output Power Capability.
Typical Application with Through-Hole PC Board Layout
4 _Feedback
Regulated
Output Filtered
VOUT _{= 8.0V @ 1.0A}
Unregulated
DC Input
+VIN
+VIN = +10V to + 40V 1
TC2575-ADJ
Output
L1
330mH
L2
25µH
Regulated
Output Filtered
C1
100µF
/50V
3 GND
2
5 _ON/OFF
D1
1N5819
R2
10k
C3
100µF/16V
C2
330µF/16V
R1
1.8k
VOUT2 _{= 8.0V @ 1.0A}
( ) ^{1.0 + R2}
VOUT = VREF +
R1
C1 – 100µF, 63V, Aluminum Electrolytic
C2 – 330µF, 16V, Aluminum Electrolytic
VREF = 1.23V
R1 is between 1.0k and 5.0k
C3 – 100µF, 16V, Aluminum Electrolytic
D1 – 1.0A, 40V, Schottky Rectifier, 1N5819
L1 – 330µH, Tech 39: 77 458 BV, Toroid, Through-Hole, Pin 3 = Start, Pin 7 = Finish
L2 – 25µH, TDK: SFT52501, Toroid Core, Through-Hole
R1 – 1.8k
R2 – 10k
Figure 17. Schematic Diagram of the 8.0V at 1.0A Step-Down Converter Using the TC2575-ADJ
TC2575-1 3/13/00
20