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The FOD2743 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 50% to 100%. 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 FOD2743, 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 dip white package.
FOD2743B Maximum Ratings
Parameter
Symbol
Value
Units
Storage Temperature
TSTG
-40 to +125
°C
Operating Temperature
TOPR
-25 to +85
°C
Reflow Temperature Profile (refer to fig. 21)
Input Voltage
VLED
37
V
Input DC Current
ILED
20
mA
Collector-Emitter Voltage
VCEO
70
V
Emitter-Collector Voltage
VECO
7
V
Collector Current
IC
20
mA
Input Power Dissipation (note 1)
PD1
145
mW
Transistor Power Dissipation (note 2)
PD2
85
mW
Total Power Dissipation (note 3)
PD3
145
mW
FOD2743B Features
Optocoupler, precision reference and error amplifier in single package 2.5V reference CTR 50% to 100% at 1mA 5,000V RMS isolation UL approval E90700, Vol. 2 CSA approval 1296837 VDE approval pending BSI approval pending Low temperature coefficient 50 ppm/°C max FOD2743A: tolerance 0.5% FOD2743B: tolerance 1% FOD2743C: tolerance 2%
