TC2574 datasheet(18/25 Pages) TELCOM

18 / 25 page

TC2574

TC2574-1 1/6/00

0.5A Step-Down Switching Regulator

VTH

≈ V

Z1 +

(1.0 +

R2 ) VBE (Q1)

Figure 14. Undervoltage Lockout Circuit for Buck Converter

10k

1N5242B

10k

2N3904

47k

CIN

µF

TC2574

(5V)

and

GNDs

Pins

ON/OFF

+VIN

NOTE: This picture does not show the complete circuit.

Figure 15. Undervoltage Lockout Circuit for Buck-Boost Converter

15 k

1N5242

15 k

2N3904

68 k

Cin

22mF

TC2574

(5V)

and

GNDs

Pins

ON/OFF

+VIN

–VOUT

NOTE: This picture does not show the complete circuit (see Figure 8).

Adjustable Output, Low-Ripple Power Supply

A 0.5 A output current capability power supply that

features an adjustable output voltage is shown in Figure 16.

This regulator delivers 0.5 A into 1.2 to 35 V output. The input

voltage ranges from roughly 3.0 to 40 V. In order to achieve

a 10 or more times reduction of output ripple, an additional

L–C filter is included in this circuit.

Figure 16. 1.2 to 35V Adjustable 500mA Power Supply with Low Output Ripple

1N5819

150

µH

Output

Feedback

50 k

1.1 k

µH

Output

Voltage

1.2 to 35V @ 0.5 A

Optional Output

Ripple Filter

40V Max

Unregulated

DC Input

COUT

1000

µF

100

µF

CIN

µF

TC2574–ADJ

Pwr

GND

+VIN

Sig

GND

ON/OFF

TC2574 Datasheet(PDF) 18 Page - TelCom Semiconductor, Inc

TC2574 Datasheet(HTML) 18 Page - TelCom Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Datasheet Download

Link URL