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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： | 9/13页 |
| 文件大小： | 300K |
| 代理商： | GM1431BS8R |
GM1431
9
Design Guide for AC-DCSMPS
(Switching Mode Power Supply)
Use of Shunt Regulator in Transformer Secondary Side Control
This example is applicable to both forward transformers and flyback transformers. A shunt regulator is used on the secondary
side as an error amplifier, and feedback to the primary side is provided via a photocoupler.
Dc characteristic determination:
In figure 16, R
1
and R are protection resistor for the light emitting
2
diode in the photocoupler, and R is a bypass
2
resistor to feed I Minimum, and these are
K
determined as shown below. The photocoupler
specification should be obtained separately from the
manufacturer. Using the parameters in figure 16, the
following formulas are obtained:
V Is the GM1431 operating voltage, and is set at
K
around 3V, taking into account a margin for
fluctuation. R is the current shunt resistance for the
2
light emitting diode, in which a bias current I of
B
around 1/5 I
flows.
F
Next, the output voltage can be determined by R
3
and R , and the following formula is obtained:
4
The absolute values of R and R are determined by
3
4
the GM1431 reference input current I
and the AC
ref
characteristics described in the next section. The I
ref
value is around 1.3μA Typ.
Determination of External Costants for the Shunt Regulator
R1 = , R2 =
V - V - V
O
F
K
I +I
F
B
V
F
I
B
V = X V
, V
=2.5V Typ
O
ref
erf
R3 +R4
R4
GM384X
GM38C4X
Transformer
Phototransistor
Photocoupler
Light
emitting diode
V
F
R
1
R
2
R
3
R
4
R
5
C
1
V
K
I
F
I
B
REF
GND
V
O
(+)
(-)
Output
Vref
Figure 16. Typical Shunt Regulator/ Error Amplifier
SBD
GM1431
A
A
MICROELECTRONICS
GM1431
Adjustable Shunt Regulator
ADJUSTABLE SHUNT REGULATOR
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相关代理商/技术参数 |
参数描述 |
|---|---|
| GM1431BS8RL | 制造商:GAMMA 制造商全称:GAMMA 功能描述:ADJUSTABLE SHUNT REGULATOR |
| GM1431BS8T | 制造商:GAMMA 制造商全称:GAMMA 功能描述:ADJUSTABLE SHUNT REGULATOR |
| GM1431BST23B | 制造商:GAMMA 制造商全称:GAMMA 功能描述:ADJUSTABLE SHUNT REGULATOR |
| GM1431BST23R | 制造商:GAMMA 制造商全称:GAMMA 功能描述:ADJUSTABLE SHUNT REGULATOR |
| GM1431BST23RL | 制造商:GAMMA 制造商全称:GAMMA 功能描述:ADJUSTABLE SHUNT REGULATOR |
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