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부품번호 | FOD2741ATV 기능 |
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기능 | OPTICALLY ISOLATED ERROR AMPLIFIER | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 15 페이지수
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A
FOD2741B
FOD2741C
DESCRIPTION
The FOD2741 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 FOD2741, 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.
FEATURES
• Optocoupler, precision reference and error amplifier in single package
• 2.5V reference
• CTR 100% to 200%
• 5,000V RMS isolation
• UL approved E90700, Volume 2
CSA approval 1296837
VDE approval 40002463
BSI approval 8702, 8703
• Low temperature coefficient 50 ppm/°C max
• FOD2741A: tolerance 0.5%
FOD2741B: tolerance 1%
FOD2741C: tolerance 2%
APPLICATIONS
• Power supplies regulation
• DC to DC converters
8
1
8
1
8
1
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 15
4/14/03
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A
FOD2741B
FOD2741C
OUTPUT CHARACTERISTICS (TA = 25°C Unless otherwise specified.)
Parameter
Test Conditions Symbol
Min
Typ
Max Unit
Collector dark current
Emitter-collector voltage breakdown
Collector-emitter voltage breakdown
(VCE = 10 V) (Fig. 5)
(IE = 100 µA)
(IC = 1.0mA)
ICEO
BVECO
BVCEO
7
70
50 nA
V
V
TRANSFER CHARACTERISTICS (TA = 25°C Unless otherwise specified.)
Parameter
Test Conditions Symbol Min Typ Max Unit
Current transfer ratio
Collector-emitter
saturation voltage
(ILED = 10 mA, VCOMP = VFB,
VCE = 5 V) (Fig. 6)
CTR
(ILED = 10 mA, VCOMP = VFB,
IC = 2.5 mA) (Fig. 6)
VCE (SAT)
100
200 %
0.4 V
ISOLATION CHARACTERISTICS (TA = 25°C Unless otherwise specified.)
Parameter
Test Conditions Symbol Min
Input-output insulation
leakage current
Withstand insulation
voltage
Resistance (input to output)
(RH = 45%, TA = 25°C, t = 5s,
VI-O = 3000 VDC) (note. 1)
(RH <= 50%, TA = 25°C, t = 1 min)
(notes. 1)
VI-O = 500 VDC (note. 1)
II-O
VISO
RI-O
5000
Typ
1012
Max Unit
1.0 µA
Vrms
Ohm
SWITCHING CHARACTERISTICS (TA = 25°C Unless otherwise specified.)
Parameter
Test Conditions Symbol Min
Bandwidth
Common mode transient
immunity at output high
Common mode transient
immunity at output low
(Fig. 7)
(ILED = 0 mA, Vcm = 10 VPP
RL = 2.2 kΩ (Fig. 8) (note. 2)
(ILED = 10 mA, Vcm = 10 VPP
RL = 2.2 kΩ (Fig. 8) (note. 2)
BW
CMH
CML
Typ
10
1.0
1.0
Max Unit
kHZ
kV/µs
kV/µs
Notes
1. Device is considered as a two terminal device: Pins 1,2 3 and 4 are shorted together and Pins 5,6,7 and 8 are shorted together.
2. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the com-
mon mode impulse signal, Vcm, to assure that the output will remain high. Common mode transient immunity at output low is
the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will
remain low.
© 2003 Fairchild Semiconductor Corporation
Page 4 of 15
4/14/03
4페이지 OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A
FOD2741B
FOD2741C
TYPICAL PERFORMANCE CURVES
Fig. 9a – LED Current vs. Cathode Voltage
15
TA = 25°C
VCOMP = VFB
10
5
0
-5
-10
-15
-1
01 2
VCOMP - Cathode Voltage (V)
3
Fig. 9b – LED Current vs. Cathode Voltage
1.0
TA = 25°C
VCOMP = VFB
0.5
0.0
-0.5
-1.0
-1
01 2
VCOMP - Cathode Voltage (V)
3
2.510
2.508
Fig. 10 – Reference Voltage vs. Ambient Temperature
ILED = 10mA
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
2.490
-40
-20
0 20 40 60 80 100
TA - Ambient Temperature (°C)
Fig. 11 – Reference Current vs Ambient Temperature
1.30
ILED = 10mA
R1 = 10kΩ
1.25
1.20
1.15
1.10
1.05
-40
-20
0 20 40 60 80 100
TA - Ambient Temperature (°C)
Fig. 12 – Off-State Current vs. Ambient Temperature
100
VCC = 37V
10
1
-40 -20
0 20 40 60
TA - Ambient Temperature (°C)
80 100
Fig. 13 – Forward Current vs. Forward Voltage
20
15
10 25°C
70°C
0°C
5
0.9 1.0 1.1 1.2 1.3 1.4
VF - Forward Voltage (V)
© 2003 Fairchild Semiconductor Corporation
Page 7 of 15
4/14/03
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부품번호 | 상세설명 및 기능 | 제조사 |
FOD2741ATV | OPTICALLY ISOLATED ERROR AMPLIFIER | Fairchild Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |