SC4525C

7

Recommended Component Parameters in Typical Applications

Table 5 lists the recommended inductance (L

) and compensation network (R7, C5, C8) for common input and output

voltages. The inductance is determined by assuming that the ripple current is 35% of load current I

O. The compensator

parameters are calculated by assuming a 47mF low ESR ceramic output capacitor and a loop gain crossover frequency

of F

SW/0.

Table 5. Recommended inductance (L

1) and compensator (R7, C5, C8)

Vin(V)

Vo(V)

Io(A)

Fsw(kHz)

C2(uF)

L1(uH)

R7(k)

C5(nF)

C8(pF)

Snubber

1.5

500

3.3

5.23

3.9

500

4.7

8.45

3.9

1000

2.2

15.4

0.82

500

6.8

12.1

3.9

1000

3.3

20.5

0.82

500

6.8

15.4

3.9

1000

3.3

36.5

0.82

500

6.8

22.6

3.9

1000

3.3

47.5

0.82

10

500

3.3

36.5

3.9

1.5

300

6.8

3.57

3.9

2.5

500

6.8

6.49

3.9

500

6.8

12.1

3.9

1000

3.3

22.6

0.82

500

8.2

15.4

3.9

1000

4.7

30.9

0.82

500

10

26.1

3.9

1000

4.7

52.3

0.82

10

500

15

30.9

3.9

1 +220pF

3.3

5

no

7.5

7.5

24

3

47

Typical Applications

Recommended Parameters

12

3

47

22

no

2.5

3.3

5