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參數(shù)資料
| 型號(hào)： | LT4430 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Secondary-Side Optocoupler Driver |
| 中文描述： | 二次側(cè)驅(qū)動(dòng)光電耦合器 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 2118K |
| 代理商： | LT4430 |
LT4430
7
4430f
S U
APPLICATIO
Block Diagram Operation
A precision voltage reference, a high-bandwidth error
amplifier, an inverting optocoupler driver and an overshoot
control amplifier comprise the LT4430. Referring to the
block diagram, a start-up circuit establishes all internal
current and voltage biasing for the IC. A precision-trimmed
bandgap generates the 600mV reference voltage and a
1.1V bias voltage for the optocoupler driver. Room tem-
perature reference voltage accuracy is specified at ±0.75%
and operating temperature range tolerance is specified at
±1.25%. The 600mV reference ties to the non-inverting
input of the error amplifier.
The LT4430 error amplifier senses the output voltage
through an external resistor divider and regulates the
FB pin to 600mV. The FB pin ties to the inverting input
of the error amplifier. The error amplifier’s open loop DC
gain is 80dB and its unity-gain crossover frequency of
9MHz provides negligible phase shift at typical feedback
loop crossover frequencies. The error amplifier is a true
W
U
U
BLOCK DIAGRA
W
–
+
–
+
+
V
IN
R2
2k
I
8.5μA
V
IN
V
IN
I1
12.5μA
1.1V
0.6V
FB
DFB
V1
0.2V
+
V
48mV
R1
2k
GND
S1
NORMALLY
OPEN
LOGIC
AND
DELAY
UVLO
STARTUP
BIAS AND
REFERENCE
GENERATOR
ERROR
AMP
OC
AMP
OC
Q6
COMP
OUT
+
V2
0.6V
Q7
–
+
OPTO
V
IN
I2
12.5μA
Q4
Q1
Q5
Q2
R3
15k
R4
90k
Q3
4430 BD01
voltage-mode amplifier and frequency compensation con-
nects around the amplifier. Typical LT4430 compensation
schemes use series R-C in parallel with C networks from
the COMP pin to the FB pin.
The optocoupler driver amplifies the voltage difference
between the COMP pin and the 1.1V bias potential applied
to its non-inverting terminal with an inverting gain of 6. This
signal drives the optocoupler referenced to GND. Driving
the optocoupler referenced to GND accommodates low
output voltages and simplifies loop frequency compen-
sation as the secondary feedback path with a traditional
“431” topology is eliminated. A resistor in series with the
optocoupler sets the optocoupler’s DC bias current. The
opto driver amplifier sources a guaranteed maximum of
10mA, sinks 350μA typically and is short-circuit protected.
The optocoupler driver amplifier’s typical –3dB bandwidth
is 600kHz. The optocoupler’s output crosses the galvanic
isolation barrier and closes the feedback loop to the pri-
mary-side controller.
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相關(guān)代理商/技術(shù)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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