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FOD2741ASDVのメーカーはFairchild Semiconductorです、この部品の機能は「OPTICALLY ISOLATED ERROR AMPLIFIER」です。 |
部品番号 | FOD2741ASDV |
| |
部品説明 | OPTICALLY ISOLATED ERROR AMPLIFIER | ||
メーカ | Fairchild Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとFOD2741ASDVダウンロード(pdfファイル)リンクがあります。 Total 15 pages
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
1 Page OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A
FOD2741B
FOD2741C
ELECTRICAL CHARACTERISTICS (TA = 25°C Unless otherwise specified.)
INPUT CHARACTERISTICS
Parameter
Test Conditions Symbol Device Min. Typ. Max. Unit
LED Forward Voltage
(ILED = 10 mA, VCOMP = VFB) (fig.1)
VF
ALL
1.5 V
A 2.482 2.495 2.508 V
Reference Voltage
ILED = 10 mA, VCOMP = VFB VREF
B 2.470 2.495 2.520 V
C 2.450 2.500 2.550 V
Deviation of VREF over
temperature
TA = -25°C to +85°C VREF (DEV) ALL
4.5 17 mV
Ratio of VREF variation to the
output of the error amplifier
ILED = 10 mA
∆VCOMP = 10V to VREF
∆VCOMP = 36V to 10V
∆VREF/
∆VCOMP
ALL
-1.0 -2.7 mV/
-0.5 -2.0 V
Feedback Input Current
ILED = 10mA, R1 = 10kΩ (fig 3)
IREF
ALL
1.5 4 µA
Deviation of IREF over
temperature
TA = -25°C to +85°C IREF (DEV) ALL
0.4 1.2 µA
Minimum Drive Current
VCOMP = VFB (fig.1) ILED (MIN) ALL
0.45 1.0 mA
Off-state error amplifier current
VLED = 37V, VFB = 0 (fig 4.) I(OFF)
ALL
0.05 1.0 µA
Error amplifier output impedance
(see note 2)
VCOMP = VREF, ILED = 1mA to 20mA,
f ≥ 1.0 kHz
|ZOUT|
ALL
0.15 0.5 Ω
1. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values
obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage, ∆VREF,
is defined as:
∆VREF (ppm/°C) = -{---V----R----E---F---(--D----E----V---)--/--V----R----E---∆F----(T--T--A--A-----=------2---5----°--C-----)--}-----×----1----0---6-
where ∆TA is the rated operating free-air temperature range of the device.
2. The dynamic impedance is defined as |ZOUT| = ∆VCOMP/∆ILED. When the device is operating with two external resistors (see
Figure 2), the total dynamic impedance of the circuit is given by:
ZOUT, TOT = ∆--∆---V-I- ≈ ZOUT × 1 + RR-----12--
© 2003 Fairchild Semiconductor Corporation
Page 3 of 15
4/14/03
3Pages FOD2741A
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741B
FOD2741C
VCC = +5V DC
RL 1
VOUT
2
3
4
IF = 10 mA
8
7
0.1 VPP
47Ω
1µf
6
5
VIN
0.47V
Fig. 7 Frequency Response Test Circuit
VCC = +5V DC
R1
2.2kΩ
VOUT
1
2
3
IF = 0 mA (A)
IF = 10 mA (B)
8
7
AB
6
45
VCM
_+
10VP-P
Fig. 8 CMH and CML Test Circuit
© 2003 Fairchild Semiconductor Corporation
Page 6 of 15
4/14/03
6 Page | |||
ページ | 合計 : 15 ページ | ||
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部品番号 | 部品説明 | メーカ |
FOD2741ASDV | OPTICALLY ISOLATED ERROR AMPLIFIER | Fairchild Semiconductor |