L4964 データシートの表示（PDF） - STMicroelectronics

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L4964

HIGH CURRENT SWITCHING REGULATOR

STMicroelectronics 

L4964

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

Figure 13 : Typical Application Circuit.

current limiter level. MPP nuclei have very soft satu-

ration characteristics.

L

=

(Vi −

Vi

Vo) V0

f ∆IL

,

C

=

(Vi − Vo) V0

8L f2 ∆Vo

∆IL = Inductance current ripple

∆Vo = Output ripple voltage

L 4964

C7, C8 : EKR (ROE)

SUGGESTED INDUCTOR (L1)

Core Type

No

Turns

Wire

Gauge

(mmm)

Magnetics 58930 – A2MPP 43

1.0

Thomson GUP 20 x 16 x 7 50

0.8

Siemens EC 35/17/10

(B6633& – G0500 – X127)

40 2 x 0.8

VOGT 250 µH Toroidal Coil, Part Number

5730501800

Air

Gap

(mm)

–

0.7

–

Resistor Values for Standard Output Volt-

ages

V0

12 V

15 V

18 V

R8

4.7 kΩ

4.7 kΩ

4.7 kΩ

R7

6.2 kΩ

9.1 kΩ

12 kΩ

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

10/13

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