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PDF ( 数据手册 , 数据表 ) FOD2742A

零件编号 FOD2742A
描述 OPTICALLY ISOLATED ERROR AMPLIFIER
制造商 Fairchild Semiconductor
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FOD2742A 数据手册, 描述, 功能
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A
FOD2742B
FOD2742C
DESCRIPTION
The FOD2742 Optically Isolated Amplifier consists of the popular KA431 precision
programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide
(GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3
grades of reference voltage tolerance = 2%, 1%, and 0.5%.
The Current Transfer Ratio (CTR) ranges from 100% to 200%. It also has an outstanding
temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/
reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc con-
verters.
When using the FOD2742, power supply designers can reduce the component count and
save space in tightly packaged designs. The tight tolerance reference eliminates the need
for adjustments in many applications. The device comes in a 8-pin small outline package.
FEATURES
• Optocoupler, precision reference and error amplifier in single package
• 2.5V reference
• CTR 100% to 200%
• 2,500V RMS isolation
• UL approval E90700, Volume 2 • BSI approval 8661, 8662
• VDE approval 136616
• CSA approval 1113643
• Low temperature coefficient 50 ppm/°C max
• FOD2742A: tolerance 0.5%
FOD2742B: tolerance 1%
FOD2742C: tolerance 2%
APPLICATIONS
• Power supplies regulation
• DC to DC converters
FUNCTIONAL BLOCK DIAGRAM
NC 1
C2
E3
NC 4
8 LED
7 FB
6 COMP
5 GND
PIN DEFINITIONS
Pin Number
1
2
3
4
5
6
7
8
Pin Name
NC
C
E
NC
GND
COMP
FB
LED
Pin function description
Not connected
Phototransistor Collector
Phototransistor Emitter
Not connected
Ground
Error Amplifier Compensation. This pin is the output of the error amplifier. *
Voltage Feedback. This pin is the inverting input to the error amplifier
Anode LED. This pin is the input to the light emitting diode.
* The compensation network must be attached between pins 6 and 7.
© 2003 Fairchild Semiconductor Corporation
Page 1 of 13
8/27/03







FOD2742A pdf, 数据表
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A
FOD2742B
FOD2742C
TYPICAL PERFORMANCE CURVES
Fig. 14 – Dark Current vs. Ambient Temperature
1000 VCE = 10V
100
10
1
0.1
-40
-20
0 20 40 60
TA - Ambient Temperature (°C)
80 100
Fig. 15 – Collector Current vs. Ambient Temperature
30
VCE = 5V
25
ILED = 20mA
20
15 ILED = 10mA
10
5
0
0
ILED = 5mA
ILED = 1mA
10 20 30 40 50 60 70 80 90 100
TA - Ambient Temperature (°C)
Fig. 16 – Current Transfer Ratio vs. LED Current
160
VCE = 5V
140 0°C
25°C
120
70°C
100
80
60
40
1
10
ILED - Forward Current (mA)
100
Fig. 17 – Saturation Voltage vs. Ambient Temperature
0.26
0.24
ILED = 10mA
IC = 2.5mA
0.22
0.20
0.18
0.16
0.14
0.12
0.10
-40
-20
0 20 40 60
TA - Ambient Temperature (°C)
80 100
Fig. 18 – Collector Current vs. Collector Voltage
35
TA = 25°C
30 ILED = 20mA
25
20
ILED = 10mA
15
10
ILED = 5mA
5
ILED = 1mA
0
0 1 2 3 4 5 6 7 8 9 10
VCE - Collector-Emitter Voltage (V)
Fig. 19 – Rate of Change Vref to Vout vs. Temperature
-0.22
-0.24
-0.26
-0.28
-0.30
-0.32
-0.34
-0.36
-0.38
-0.40
-0.42
-0.44
-40
-20
0 20 40 60
Temperature - °C
80 100
© 2003 Fairchild Semiconductor Corporation
Page 8 of 13
8/27/03














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