參數(shù)資料
型號： LT4430
廠商： Linear Technology Corporation
英文描述： Secondary-Side Optocoupler Driver
中文描述： 二次側驅動光電耦合器
文件頁數(shù)： 13/20頁
文件大?。?/td> 2118K
代理商： LT4430
LT4430
13
4430f
S U
APPLICATIO
side error amplifier’s output is:
W
U
U
V
V
A
R
+
1
R
R
s R C
s R
C
s A R
C
C
s R
C
C
(
C
C
s R
R
R
K
(
C
)
s
R
R
C
OUT
K
K
K
D
D
1
=
+
+
+
+
+
+
(
+
+
–
(
)(
1
)
(
)]
3
(
)
)
(
)
2
2
1
1
1
3
3
1
2
1
3
2
2
3
3
6
1
1
C
CTR R
R
K
(
R
s r
CTR R
R
K
(
R
C
C
s R
C
K
C
D
C
D
CB
BE
C
C
)
)
(
)
)
+
+
+
+
+
(
)
π
1
1
1
where:
A = LT4430 open loop DC Gain
R
D
= Optocoupler diode equivalent small-signal
resistance
CTR = Optocoupler AC current transfer ratio
C
CB
= Optocoupler non-linear collector-to-base
capacitor
C
BE
= Optocoupler non-linear base-to-emitter
capacitor
r
π
= Optocoupler small-signal base-to-emitter
resistor
Figure 6a and its transfer function illustrate most of the
possible poles and zeroes that can be set and are shown
for the sake of completeness. In a practical application, the
transfer function simplifies considerably because not all
the poles and zeroes are used. Also, different combinations
of poles and zeroes can result in the same small signal
gain-phase characteristics but demonstrate dramatically
different large-signal behavior.
The common-collector configuration eliminates the miller
effect of the output transistor’s collector-to-base capaci-
tance and generally increases achievable loop bandwidth.
Figure 6b illustrates the common-collector design with the
output transistor’s emitter connected to the inverting input
of the primary-side controller’s error amplifier.
In this example, the error amplifier is typically a voltage
error amplifier configured as a transimpedance amplifier.
The optocoupler transistor’s emitter provides feedback
information directly to the FB pin and the resistor R
E
from
FB to GND sets the DC bias condition for the optocoupler.
The open loop transfer function from the output voltage
to the primary-side error amplifier’s output is:
V
V
A
R
+
1
R
R
s R C
s R
C
s A R
C
C
s R
C
C
(
C
C
s R
R
R
K
(
C
)
s
R
R
C
OUT
K
K
K
D
D
=
+
+
+
+
+
+
(
+
+
–
(
)(
1
)
(
)]
3
(
)
)
(
)
2
2
1
1
1
3
3
1
2
1
3
2
2
3
3
6
1
1
C
CTR R
R
K
(
R
s r
C
s R
C
K
C
D
BE
C
C
)
)
1
+
+
(
)
+
(
)
π
1
1
1
Figure 6b and its transfer function illustrate most of the
possible poles and zeroes that can be set and are shown
for the sake of completeness. In a practical application,
the transfer function simplifies considerably because not
all the poles and zeroes are used.
Figure 6b. Frequency Compensation with Optocoupler Common-Collector Configuration
–
+
–
+
V
CC
V
REF
V
C
R
E
R
K
C
K
PRIMARY-SIDE
ERROR AMP
OPTO
DRIVER
OPTO
OPTO
LT4430
COMP
1.1V
0.6V
FB
–
+
ERROR
AMP
R3
R4
15k
R5
90k
4430 F06b
ISOLATION
BARRIER
V
OUT
FB
C3
R1
R2
C1
C2
R
C
C
C
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相關代理商/技術參數(shù)
參數(shù)描述
LT4430_1 制造商:LINER 制造商全稱:Linear Technology 功能描述:Secondary-Side Opto-Coupler Driver Ground-Referenced Opto-Coupler Drive
LT4430ES6 制造商:Linear Technology 功能描述:
LT4430ES6#PBF 制造商:Linear Technology 功能描述:Secondary Side Optocoupler Driver 6-Pin TSOT-23 制造商:Linear Technology 功能描述:OPTO-COUPLER DRIVER 20V TSOT 制造商:Linear Technology 功能描述:OPTO-COUPLER DRIVER, 20V, TSOT-23-6; IC Function:Optocoupler Driver; Supply Voltage Min:3V; Supply Voltage Max:20V; Operating Temperature Min:-40C; Operating Temperature Max:125C; Digital IC Case Style:TSOT-23; No. of Pins:6 ;RoHS Compliant: Yes
LT4430ES6#TR 制造商:Linear Technology 功能描述:Secondary Side Optocoupler Driver 6-Pin TSOT-23 T/R
LT4430ES6#TRM 制造商:Linear Technology 功能描述:Secondary Side Optocoupler Driver 6-Pin TSOT-23 T/R
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