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參數(shù)資料
| 型號： | GM431CT92T |
| 廠商： | American Power Management Inc. |
| 英文描述： | 2.5V ADJUSTABLE SHUNT REGULATOR |
| 中文描述： | 2.5V的可調(diào)并聯(lián)穩(wěn)壓器 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 184K |
| 代理商： | GM431CT92T |
G
M
4
3
1
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. GM431 Error Amplification Characteristic
G1
G2
When R = 0
5
G
a
in
G
(d
B
)
F1
FAC
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)
10
G =
2
Corner frequencies
f = 1/(2p C G R)
11
0
3
f = 1/(2p 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
DVref/DV
, and is approximately 50 dB.
KA
R5
R3
Practical Example
Consider the example of a photocoupler, with an internal light emitting diode V = 1.05 V and I = 2.5 mA,
F
power supply output voltage V = 5 V, and bias resistance R current of approximately 1/5 I at 0.5 mA. If
22
F
the shunt regulator V = 3 V, the following values are found.
K
Next, assume that R = R = 10 kW. This gives a 5 V output. If R = 3.3 kW and C = 0.022 F, the
34
5
1
following values are found.
G = 3.3 kW / 10 kW = 0.33 times (–10 dB)
2
f = 1 / (2 x p x 0.022 F x 316 x 10 kW) = 2.3 (Hz)
1
f = 1 / (2 x p x 0.022 F x 3.3 kW) = 2.2 (kHz)
2
R =
=316W
1
5V - 1.05V - 3V
2.5mA + 0.5mA
R =
=2.1 kW
2
1.05V
0.5mA
F
Frequency f (Hz)
osc
*
: PWM switching frequency
fosc
A
MICROELECTRONICS
GM431
2.5V ADJUSTABLE SHUNT REGULATOR
Power Management
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