17431 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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17431

Shunt Regulator

Hitachi -> Renesas Electronics 

HA17431 Series

AC characteristic determination: This refers to the determination of the gain frequency characteristic of

the shunt regulator as an error amplifier. Taking the configuration in figure 2, the error amplifier

characteristic is as shown in figure 3.

G1

f1 fAC

G2 When R5 ≠ 0

When R5 = 0

f2

fOSC Frequency f (Hz)

* fOSC : PWM switching frequency

Figure 3 HA17431 Error Amplification Characteristic

In Figure 3, the following formulas are obtained:

Gain

G1 = G0 ≈ 50 dB to 60 dB (determined by shunt regulator)

G2

=

R5

R3

Corner frequencies

f1 = 1/(2π C1 G0 R3)

f2 = 1/(2π C1 R5)

G0 is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation

∆Vref/∆VKA, and is approximately 50 dB.

Rev.1, Sep. 2002, page 18 of 24

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