APPLICATION INFORMATION

CHOOSING THE INDUCTOR AND CAPACITOR

The input and output capacitors of the L4964 must

have a low ESR and low inductance at high current

ripple.

Preferably, the inductor should be a toroidal type or

wound on a Moly-Permalloy nucleus.Saturation

must not occur at current levels below 1.5 times the

current limiter level. MPP nuclei have very soft satu-

ration characteristics.

L=

,C =

8L f

2

Figure 13 : Typical Application Circuit.

SUGGESTED INDUCTOR (L1)

Core Type

No

Turns

Wire

Gauge

(mmm)

Air

Gap

(mm)

Magnetics 58930 – A2MPP

43

1.0

–

Thomson GUP 20 x 16 x 7

50

0.8

0.7

Siemens EC 35/17/10

(B6633& – G0500 – X127)

40

2 x 0.8

–

VOGT 250

µH Toroidal Coil, Part Number

5730501800

Resistor Values for Standard Output Volt-

ages

R8

R7

12 V

15 V

18 V

4.7 k

Ω

4.7 k

Ω

4.7 k

Ω

6.2 k

Ω

9.1 k

Ω

12 k

Ω

L 4964

C7, C8 : EKR (ROE)

Figure 14 : P.C. Board and Component Layout of the Circuit of Fig. 13 (1:1 scale)

L4964

10/13