FOD2741BSD Fairchild Semiconductor, FOD2741BSD Datasheet

ISOLATED ERROR AMPLIFIER

FOD2741BSD

Manufacturer Part Number
FOD2741BSD
Description
ISOLATED ERROR AMPLIFIER
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of FOD2741BSD

No. Of Channels
1
Isolation Voltage
5kV
Input Current
10mA
Output Voltage
70V
Opto Case Style
SMD
No. Of Pins
8
Svhc
No SVHC (15-Dec-2010)
Approval Bodies
BSI, CSA, VDE
Approval Category
UL
Optocoupler Output Type
Phototransistor
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
FOD2741BSD
Manufacturer:
FAIRCHILD/仙童
Quantity:
20 000
Part Number:
FOD2741BSDV
Manufacturer:
FAIRCHILD/仙童
Quantity:
20 000
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
• Low temperature coefficient 50 ppm/°C max
• FOD2741A: tolerance 0.5%
APPLICATIONS
• Power supplies regulation
• DC to DC converters
* The compensation network must be attached between pins 6 and 7.
© 2003 Fairchild Semiconductor Corporation
FOD2741A
PIN DEFINITIONS
CSA approval 1296837
VDE approval 40002463
BSI approval 8702, 8703
FOD2741C: tolerance 2%
FOD2741B: tolerance 1%
Pin Number
1
2
3
4
5
6
7
8
Pin Name
COMP
GND
LED
NC
NC
FB
C
E
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.
Pin function description
FOD2741B
Page 1 of 15
OPTICALLY ISOLATED
ERROR AMPLIFIER
8
NC
NC
C
FUNCTIONAL BLOCK DIAGRAM
E
4
1
2
3
8
1
FOD2741C
1
8
8 LED
7
6
5
FB
COMP
GND
1
12/9/04

Related parts for FOD2741BSD

FOD2741BSD Summary of contents

Page 1

... GND 6 COMP LED * The compensation network must be attached between pins 6 and 7. © 2003 Fairchild Semiconductor Corporation FOD2741B 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 amplifi ...

Page 2

... Derate linearly from 25° rate of 1.42 mW/ °C. 3. Derate linearly from 25° rate of 2.42 mW/ °C. 4. Functional operation under these conditions is not implied. Permanent damage may occur if the device is subjected to conditions outside these ratings. © 2003 Fairchild Semiconductor Corporation OPTICALLY ISOLATED FOD2741B FOD2741 ...

Page 3

... A 2. The dynamic impedance is defined as |Z Figure 2), the total dynamic impedance of the circuit is given by: ∆V R1 ≈ × ------- - ------- - ∆I OUT, TOT OUT R2 © 2003 Fairchild Semiconductor Corporation FOD2741B (T = 25°C Unless otherwise specified.) A Test Conditions ( mA (fig.1) LED COMP mA LED COMP ...

Page 4

... 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 FOD2741B (T = 25° ...

Page 5

... REF 5 FIG (min) TEST CIRCUIT REF F, LED I (LED REF FIG TEST CIRCUIT REF FIG TEST CIRCUIT CEO © 2003 Fairchild Semiconductor Corporation FOD2741B FIG. 2. ∆ (LED) I CEO Page OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741C I (LED COMP R2 V REF 5 ∆V TEST CIRCUIT REF/ ...

Page 6

... FOD2741A OUT 2.2kΩ V OUT © 2003 Fairchild Semiconductor Corporation FOD2741B 0 Fig. 7 Frequency Response Test Circuit VCM _ + 10V P-P Fig. 8 CMH and CML Test Circuit Page OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741C 47Ω 1µ 0.47V = 12/9/04 ...

Page 7

... T - Ambient Temperature (°C) A Fig. 12 – Off-State Current vs. Ambient Temperature 100 V = 37V -40 - Ambient Temperature (°C) A © 2003 Fairchild Semiconductor Corporation FOD2741B 1.0 0.5 0.0 -0.5 -1 1.30 1.25 1.20 1.15 1.10 1. 100 100 Page OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741C Fig. 9b – ...

Page 8

... I - Forward Current (mA) LED Fig. 18 – Collector Current vs. Collector Voltage 25° VCE - Collector-Emitter Voltage (V) © 2003 Fairchild Semiconductor Corporation FOD2741B 100 0.26 0.24 0.22 0.20 0.18 0.16 0.14 0.12 0. -0.32 -0. 20mA LED -0.36 -0.38 -0. 10mA LED -0 ...

Page 9

... FOD2741A © 2003 Fairchild Semiconductor Corporation FOD2741B Fig. 20 – Voltage Gain vs. Frequency VCC=10V IF=10mA 500Ω 1kΩ -10 -15 0 100 Frequency - kHz Page OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741C RL = 100Ω 1000 12/9/04 ...

Page 10

... OUT > ---------------------------- - 1040µA R TOP © 2003 Fairchild Semiconductor Corporation OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741B Compensation The compensation pin of the FOD2741 provides the opportu- nity for the designer to design the frequency response of the converter. A compensation network may be placed between the COMP pin and the FB pin. In typical low-bandwidth systems, a 0.1µ ...

Page 11

... TYP NOTE All dimensions are in inches (millimeters) © 2003 Fairchild Semiconductor Corporation OPTICALLY ISOLATED FOD2741B Package Dimensions (Surface Mount) 0.390 (9.91) 0.370 (9.40 15° MAX ...

Page 12

... VDE mark (Note: Only appears on parts ordered with VDE 3 option – See order entry table) 4 Two digit year code, e.g., ‘03’ 5 Two digit work week ranging from ‘01’ to ‘53’ 6 Assembly package code © 2003 Fairchild Semiconductor Corporation FOD2741B VDE tested 2741A V XX ...

Page 13

... Tape Width Tape Thickness Sprocket Hole Pitch Sprocket Hole Diameter Sprocket Hole Location Pocket Location Pocket Pitch Pocket Dimensions Cover Tape Width Cover Tape Thickness Max. Component Rotation or Tilt Min. Bending Radius © 2003 Fairchild Semiconductor Corporation FOD2741B User Direction of Feed Symbol ...

Page 14

... FOD2741A Reflow Profile © 2003 Fairchild Semiconductor Corporation FOD2741B 245 C, 10–30 s 300 260 C peak 250 200 150 Time above 183 C, <160 sec 100 50 Ramp up = 2–10 C/sec 0 0 0.5 1 1.5 2 2.5 3 Time (Minute) • Peak reflow temperature: 260 C (package surface temperature) • ...

Page 15

... NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems ...

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