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FOD2711A — Optically Isolated Error Ampliﬁer

FOD2711A Rev. 1.0.0

June 2010

FOD2711A

Optically Isolated Error Amplifier

Features

■

Optocoupler, precision reference and error amplifier in

single package

■

1.240V ± 1% reference

■

CTR 100% to 200%

■

5,000V RMS isolation

■

UL approval E90700, Volume 2

Applications

■

Power supplies regulation

■

DC to DC converters

Description

The FOD2711A Optically Isolated Amplifier consists of

the popular AZ431L precision programmable shunt ref-

erence and an optocoupler. The optocoupler is a gallium

arsenide (GaAs) light emitting diode optically coupled to

a silicon phototransistor. The reference voltage toler-

ance is 1%. The current transfer ratio (CTR) ranges from

100% to 200%.

It is primarily intended for use as the error amplifier/

reference voltage/optocoupler function in isolated AC to

DC power supplies and dc/dc converters.

When using the FOD2711A, power supply designers can

reduce the component count and save space in tightly

packaged designs. The tight tolerance reference elimi-

nates the need for adjustments in many applications.

The device comes in a 8-pin dip white package.

Functional Bock Diagram Package Outlines

4 5

LED

COMP

GND

Summary of content (15 pages)

PAGE 1
FOD2711A Optically Isolated Error Amplifier Features Description ■ Optocoupler, precision reference and error amplifier in The FOD2711A Optically Isolated Amplifier consists of the popular AZ431L precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. The reference voltage tolerance is 1%. The current transfer ratio (CTR) ranges from 100% to 200%. ■ ■ ■ ■ single package 1.
PAGE 2
Pin Number Pin Name Pin Description 1 NC 2 C Phototransistor Collector 3 E Phototransistor Emitter 4 NC 5 GND 6 COMP 7 FB 8 LED Not connected 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.
PAGE 3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
PAGE 4
Input Characteristics Symbol VF VREF Parameter Test Conditions LED Forward Voltage ILED = 10mA, VCOMP = VFB (Fig. 1) Reference Voltage VCOMP = VFB, ILED = 10mA (Fig.1) Min. Typ.* Max. -40°C to +85°C 1.221 25°C 1.228 VREF (DEV) Deviation of VREF Over Temperature(4) ∆VREF / ∆VCOMP Unit 1.5 V 1.259 V 1.240 1.252 4 12 mV TA = -40 to +85°C Ratio of Vref Variation to the Output of the Error Amplifier ILED = 10 mA, VCOMP = VREF to 12V (Fig. 2) -1.5 -2.
PAGE 5
Isolation Characteristics Symbol II-O Parameter Test Conditions Input-Output Insulation Leakage Current RH = 45%, TA = 25°C, t = 5s, VI-O = 3000 VDC(6) VISO Withstand Insulation Voltage RH ≤ 50%, TA = 25°C, t = 1 min.(6) RI-O Resistance (Input to Output) VI-O = 500 VDC(6) Min. Typ. Max. Unit 1.0 µA 5000 Vrms Ω 1012 Switching Characteristics Symbol BW Parameter Test Conditions Min. Typ. Max. Unit Bandwidth (Fig.
PAGE 6
I(LED) I(LED) 8 2 2 8 VF 6 6 V 7 V R1 3 3 7 VCOMP VREF VREF R2 5 5 Figure 2. ∆VREF / ∆VCOMP Test Circuit Figure 1. VREF, VF, ILED (min.) Test Circuit I(LED) I(OFF) 8 2 8 2 IREF 6 6 3 7 V 3 V(LED) 7 V R1 5 5 Figure 3. IREF Test Circuit 8 Figure 4. I(OFF) Test Circuit I(LED) ICEO 8 2 VCE 6 IC 2 VCE 6 3 7 V 3 7 VCOMP VREF 5 5 Figure 5. ICEO Test Circuit ©2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 Figure 6. CTR, VCE(sat) Test Circuit www.
PAGE 7
FOD2711A — Optically Isolated Error Amplifier Test Circuits (Continued) VCC = +5V DC IF = 10mA RL 47Ω 8 1 1µf VOUT 7 2 VIN 0.47V 0.1 VPP 3 6 4 5 Figure 7. Frequency Response Test Circuit VCC = +5V DC IF = 0mA (A) IF = 10mA (B) R1 2.2kΩ VOUT 1 8 2 7 3 6 4 5 _ A B VCM + 10VP-P Figure 8. CMH and CML Test Circuit ©2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.
PAGE 8
Fig. 9a LED Current vs. Cathode Voltage Fig. 9b LED Current vs. Cathode Voltage 15 150 TA = 25°C VCOMP = VFB TA = 25°C VCOMP = VFB ILED – SUPPLY CURRENT (mA) ILED – SUPPLY CURRENT (mA) 10 5 0 -5 -10 -15 -1.0 100 50 0 -50 -100 -150 -0.5 0.0 0.5 1.0 1.5 -1 0 1 VCOMP – CATHODE VOLTAGE (V) VCOMP – CATHODE VOLTAGE (V) Fig. 10 Reference Voltage vs. Ambient Temperature 2 Fig. 11 Reference Current vs.
PAGE 9
Fig. 15 Collector Current vs. Ambient Temperature Fig. 14 Dark Current vs. Ambient Temperature 10000 30 VCE = 5V IC – COLLECTOR CURRENT (mA) ICEO – DARK CURRENT (nA) VCE = 10V 1000 100 10 1 25 ILED = 20mA 20 15 ILED = 10mA 10 ILED = 5mA 5 ILED = 1mA 0.1 -40 -20 0 20 40 60 80 0 100 0 10 20 TA – AMBIENT TEMPERATURE (°C) 30 40 50 60 70 80 90 100 TA – AMBIENT TEMPERATURE (°C) Fig. 17 Saturation Voltage vs. Ambient Temperature Fig. 16 Current Transfer Ratio vs.
PAGE 10
FOD2711A — Optically Isolated Error Amplifier Typical Performance Curves (Continued) Fig. 20 Voltage Gain vs. Frequency VCC = 10V IF = 10mA VOLTAGE GAIN (dB) 0 RL = 100Ω -5 -10 RL = 1kΩ RL = 500Ω -15 0.1 1 10 100 1000 FREQUENCY (kHZ) ©2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.
PAGE 11
Compensation The FOD2711A is an optically isolated error amplifier. It incorporates three of the most common elements necessary to make an isolated power supply, a reference voltage, an error amplifier, and an optocoupler. It is functionally equivalent to the popular AZ431L shunt voltage regulator plus the CNY17F-3 optocoupler. The compensation pin of the FOD2711A provides the opportunity for the designer to design the frequency response of the converter.
PAGE 12
Through Hole 0.4" Lead Spacing PIN 1 ID. 4 3 2 PIN 1 ID. 1 4 3 2 1 0.270 (6.86) 0.250 (6.35) 5 6 7 0.270 (6.86) 0.250 (6.35) 8 5 6 0.070 (1.78) 0.045 (1.14) 0.020 (0.51) MIN 0.200 (5.08) 0.140 (3.55) 0.154 (3.90) 0.120 (3.05) 0.022 (0.56) 0.016 (0.41) 7 8 0.390 (9.91) 0.370 (9.40) SEATING PLANE SEATING PLANE 0.390 (9.91) 0.370 (9.40) 0.016 (0.40) 0.008 (0.20) 0.100 (2.54) TYP 0.070 (1.78) 0.045 (1.14) 0.004 (0.10) MIN 0.200 (5.08) 0.140 (3.55) 15° MAX 0.154 (3.90) 0.120 (3.
PAGE 13
Option Example Part Number Description No Option FOD2711A S FOD2711AS SD FOD2711ASD T FOD2711AT 0.4" Lead Spacing V FOD2711AV VDE0884 TV FOD2711ATV VDE0884; 0.
PAGE 14
D0 P0 t K0 P2 E F A0 W1 W B0 P User Direction of Feed d Symbol Description W t D1 Dimension in mm Tape Width 16.0 ± 0.3 Tape Thickness 0.30 ± 0.05 P0 Sprocket Hole Pitch 4.0 ± 0.1 D0 Sprocket Hole Diameter 1.55 ± 0.05 E Sprocket Hole Location 1.75 ± 0.10 F Pocket Location 7.5 ± 0.1 4.0 ± 0.1 P2 P Pocket Pitch 12.0 ± 0.1 A0 Pocket Dimensions 10.30 ±0.20 B0 10.30 ±0.20 K0 4.90 ±0.20 W1 d R Cover Tape Width 1.6 ± 0.1 Cover Tape Thickness 0.1 max Max.
PAGE 15
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