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GM431SAST23MRG Datasheet(PDF) 7 Page - Gamma Microelectronics Inc.

Part # GM431SAST23MRG
Description  2.5V ADJUSTABLE SHUNT REGULATOR
Download  11 Pages
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Manufacturer  GAMMA [Gamma Microelectronics Inc.]
Direct Link  http://www.gammamicro.com.tw/
Logo GAMMA - Gamma Microelectronics Inc.

GM431SAST23MRG Datasheet(HTML) 7 Page - Gamma Microelectronics Inc.

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GM431S
2.5V ADJUSTABLE
SHUNT REGULATOR
7
G1
* fOSC: PWM Switching frequency
G2
F1
F2
FAC
AC Characteristic Determination:
This refers to the determination of the gain frequency characteristic of the Shunt regulator as an error
amp1ifier. Taking the configuration in Figure 10, the error amp1ifier characteristic is as Shown in Figure
10.
In Figure 17, the following formulas are obtained:
Gain
G1 = G0
 50 dB to 60 dB (determined by shunt regulator)
Corner frequencies
f1 = 1/
pC1G0R3)
f2 = 1/
pC1R5)
G0 iS the Shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage
fluctuation:
V
REF/VKA, and is approximately 50 dB.
Practical Example
Consider the example of a photocoupler, with an internal light emitting diode VF = 1.05 V and IF = 2.5mA,
power supply output vo1tage V2 = 5V, and bias resistance R2 current of approximately 1/5 IF at 0.5mA.
If the Shunt regulator VK = 3V, the following values are found.
Next, assume that R3 = R4 = 10k. This gives a 5V output. If R5 = 3.3 k, and C1 = 0.022 pF, the
following values are found.
G2 = 3.3k
Ω / 10kΩ = 0.33 times (-10 dB)
f1 = 1 / (2    0.022µF  316  10 k) = 2.3 (Hz)
f1 = 1 / (2    0.022µF  3.3k) = 2.2 (kHz) 2
Figure 10. GM431S Error Amplification Characteristic
When R5= 0
When R5= 0
fOSC Frequency f (Hz)
G2 =
R3
R5
1.05V
R2 =
0.54mA
= 2.1k
R1 =
2.5mA + 0.54mA
5V
– 1.05V – 3V
= 316


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