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| 型号： | GM1431BS8R |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Three Terminal adjustable shunt regulator with thermal Stability Guaranteed over temperature. |
| 中文描述： | 三端温度与热稳定性保证可调并联稳压器。 |
| 文件页数： | 10/13页 |
| 文件大小： | 300K |
| 代理商： | GM1431BS8R |
GM1431
10
This refers to the determination of the gain frequency characteristic of the shunt regulator as an error amplifier.
Taking the configuration in figure 16, the error amplifier characteristic is as shown in figure 17.
AC Characteristic Determination:
Figure 17. GM1431 Error Amplification Characteristic
G1
G2
When R = 0
5
Gain G (dB)
f1
f
AC
f2
When R = 0
5
In Figure 17, the following formulas are obtained:
Gain
G
= G
50 dB to 60 dB (determined by shunt regulator)
1
0
G
=
2
Corner frequencies
f
= 1/(2
p
C
G
R )
1
1
0
3
f = 1/(2
p
C
R )
2
1
5
G
is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation
0
D
Vref/
D
V
, and is approximately 50 dB.
KA
R
5
R
3
Practical Example
Consider the example of a photocoupler, with an internal light emitting diode V = 1.05 V and I = 2.5 mA,
F
F
power supply output voltage V = 5 V, and bias resistance R current of approximately 1/5 I at 0.5 mA. If
2
2
F
the shunt regulator V = 3 V, the following values are found.
K
Next, assume that R = R = 10 k
W
. This gives a 5 V output. If R = 3.3 k
W
and C = 0.022 μF, the
3
4
5
1
following values are found.
G = 3.3 k
W
/ 10 k
W
= 0.33 times (–10 dB)
2
f = 1 / (2 x
p
x 0.022 μF x 316 x 10 k
W
) = 2.3 (Hz)
1
f = 1 / (2 x
p
x 0.022 μF x 3.3 k
W
) = 2.2 (kHz)
2
R = =316
W
1
5V - 1.05V - 3V
2.5mA + 0.54mA
R = =2.1 k
W
2
1.05V
0.54mA
f
Frequency f (Hz)
osc
*
: PWM switching frequency
f
osc
A
A
MICROELECTRONICS
GM1431
Adjustable Shunt Regulator
ADJUSTABLE SHUNT REGULATOR
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