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參數(shù)資料
| 型號： | GM431CST23RL |
| 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)： | 14/14頁 |
| 文件大小： | 184K |
| 代理商： | GM431CST23RL |
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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, R1
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 GM431 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 R3
and R , and the following formula is obtained:
4
The absolute values of R and R are determined by
34
the GM431 reference input current I
and the AC
ref
characteristics described in the next section. The Iref
value is around 0.7A Typ.
Determination of External Costants for the Shunt Regulator
R1 =
, R 2 =
V
- V - V
OF
K
I +I
FB
VF
IB
V
=
X V
, V
=2 .5 V Typ
O
ref
erf
R3 +R4
R4
GM384X
GM38C4X
Transformer
Phototransistor
Photocoupler
Light
emitting diode
VF
R1
R2
R3
R4
R5
C1
VK
IF
IB
REF
GND
VO
(+)
(-)
Output
Vref
Figure 16. Typical Shunt Regulator/ Error Amplifier
GM431
SBD
A
MICROELECTRONICS
GM431
2.5V ADJUSTABLE SHUNT REGULATOR
Power Management
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PDF描述 |
|---|---|
| GM431CST23R | 2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST23T | 2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89B | 2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89RL | 2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89R | 2.5V ADJUSTABLE SHUNT REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GM431CST23T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89B | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89RL | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:2.5V ADJUSTABLE SHUNT REGULATOR |
| GM431CST89T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:2.5V ADJUSTABLE SHUNT REGULATOR |
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