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FOD2742A Datasheet

  • FOD2742A

  • OPTICALLY ISOLATED ERROR AMPLIFIER

  • 13頁

  • FAIRCHILD

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OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A
DESCRIPTION
The FOD2742 Optically Isolated Ampli鏗乪r 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 coef鏗乧ient of 50 ppm/擄C. It is primarily intended for use as the error ampli鏗乪r/
reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc con-
verters.
FUNCTIONAL BLOCK DIAGRAM
FOD2742B
FOD2742C
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
鈥?Optocoupler, precision reference and error ampli鏗乪r in single package
鈥?2.5V reference
鈥?CTR 100% to 200%
鈥?2,500V RMS isolation
鈥?UL approval E90700, Volume 2
鈥?VDE approval 136616
鈥?FOD2742A: tolerance 0.5%
FOD2742B: tolerance 1%
FOD2742C: tolerance 2%
鈥?BSI approval 8661, 8662
鈥?CSA approval 1113643
NC
1
8 LED
C
2
7 FB
E
3
6 COMP
NC
4
5 GND
鈥?Low temperature coef鏗乧ient 50 ppm/擄C max
APPLICATIONS
鈥?Power supplies regulation
鈥?DC to DC converters
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 Ampli鏗乪r Compensation. This pin is the output of the error ampli鏗乪r. *
Voltage Feedback. This pin is the inverting input to the error ampli鏗乪r
Anode LED. This pin is the input to the light emitting diode.
* The compensation network must be attached between pins 6 and 7.
漏 2003 Fairchild Semiconductor Corporation
Page 1 of 13
8/27/03

FOD2742A 產(chǎn)品屬性

  • 3,000

  • 隔離器

  • 光隔離器 - 晶體管，光電輸出

  • -

  • 1

  • DC

  • 2500Vrms

  • 100% @ 10mA

  • 200% @ 10mA

  • 70V

  • 50mA

  • -

  • 400mV

  • 晶體管

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 管件

  • FOD2742AFSFOD2742AFS-NDFOD2742A_NLFOD2742A_NL-ND

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