TC2575

1.0A Step-Down Switching Regulator

20

TC2575-1 3/13/00

Figure 17. Schematic Diagram of the 8.0V at 1.0A Step-Down Converter Using the TC2575-ADJ

D1

1N5819

L1

330mH

L2

25

µH

Output

2

4

Feedback

R2

10k

R1

1.8k

Regulated

Output Filtered

VOUT

VOUT

2 = 8.0V @ 1.0A

Regulated

Output Filtered

= 8.0V @ 1.0A

Unregulated

DC Input

C2

330

µF/16V

C3

100

µF/16V

C1

100

µF

/50V

TC2575-ADJ

1

5

ON/OFF

GND

+VIN

3

+VIN = +10V to + 40V

The TC2576-ADJ Step-Down Voltage Regulator with 8.0V @ 1.0A Output Power Capability.

Typical Application with Through-Hole PC Board Layout

C1 – 100

µF, 63V, Aluminum Electrolytic

C2 – 330

µF, 16V, Aluminum Electrolytic

C3 – 100

µF, 16V, Aluminum Electrolytic

D1 – 1.0A, 40V, Schottky Rectifier, 1N5819

L1 – 330

µH, Tech 39: 77 458 BV, Toroid, Through-Hole, Pin 3 = Start, Pin 7 = Finish

L2 – 25

µH, TDK: SFT52501, Toroid Core, Through-Hole

R1 – 1.8k

R2 – 10k

VOUT = VREF +

R1

VREF = 1.23V

R1 is between 1.0k and 5.0k

Figure 16. Adjustable Power Supply with Low Ripple Voltage

D1

1N5819

L1

150

µH

Output

2

4

Feedback

R2

50k

R1

1.1k

L2

20

µH

Output

Voltage

1.2V to 35V @1.0A

Optional Output

Ripple Filter

Unregulated

DC Input

COUT

2200

µF

C1

100

µF

CIN

100

µF/50V

TC2575-ADJ

1

GND

+VIN

5

3

ON/OFF