TL1451A

DUAL PULSEWIDTHMODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

21

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APPLICATION INFORMATION

R7

R6

C4

470

Ω

1

µF

220

Ω

C2

R4

R3

33 k

Ω

33 k

Ω

470

Ω

150

Ω

220 k

Ω

0.47

µF

50 k

Ω

R1

500 pF

pF

C5

R5

500

C1

8

7

6

5

4

3

2

1

9

10

11

12

13

14

15

16

330 pF

L1

R2

33 k

Ω

33 k

Ω

Vref

33 k

Ω

33 k

Ω

470

Ω

470

Ω

L2

VCC

Step-Up

Output

Step-Down

Output

TL1451A

NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.

Figure 28. High-Speed Dual Switching Regulator