FOD2741A Fairchild Semiconductor, FOD2741A Datasheet

Transistor Output Optocouplers Error amplifier Optocoupler

FOD2741A

Manufacturer Part Number
FOD2741A
Description
Transistor Output Optocouplers Error amplifier Optocoupler
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of FOD2741A

Maximum Input Diode Current
20 mA
Output Device
Transistor
Output Type
DC
Configuration
1
Input Type
DC
Maximum Collector Emitter Voltage
30 V
Maximum Collector Emitter Saturation Voltage
400 mV
Isolation Voltage
5000 Vrms
Current Transfer Ratio
200 %
Maximum Forward Diode Voltage
1.5 V
Maximum Collector Current
50 mA
Maximum Power Dissipation
145 mW
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Package / Case
PDIP W
Number Of Elements
1
Forward Voltage
1.5V
Forward Current
20mA
Collector-emitter Voltage
30V
Package Type
PDIP W
Collector Current (dc) (max)
50mA
Power Dissipation
145mW
Collector-emitter Saturation Voltage
0.4V
Pin Count
8
Mounting
Through Hole
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
FOD2741A_NL

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©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
FOD2741A, FOD2741B, FOD2741C
Optically Isolated Error Amplifier
Features
Applications
Functional Bock Diagram
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 50ppm/°C max.
FOD2741A: tolerance 0.5%
FOD2741B: tolerance 1%
FOD2741C: tolerance 2%
Power supplies regulation
DC to DC converters
NC
NC
C
E
4
1
2
3
8 LED
7
6
5
FB
COMP
GND
Package Outlines
Description
The FOD2741 Optically Isolated Amplifier consists of the
popular KA431 precision programmable shunt reference
and an optocoupler. The optocoupler is a gallium ars-
enide (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 iso-
lated AC to DC power supplies and DC/DC converters.
When using the FOD2741, 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.
8
1
8
1
8
1
www.fairchildsemi.com
August 2008

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FOD2741A Summary of contents

Page 1

... ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 Description The FOD2741 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. The optocoupler is a gallium ars- enide (GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3 grades of reference voltage tolerance = 2%, 1%, and 0 ...

Page 2

... Typical Application FAN4803 PWM V 1 Control ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 Pin 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 3

... Total Power Dissipation Notes: 1. Derate linearly from 25° rate of 2.42mW/°C 2. Derate linearly from 25° rate of 1.42mW/°C. 3. Derate linearly from 25° rate of 2.42mW/°C. ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0 25°C unless otherwise specified) A Parameter (1) (2) ...

Page 4

... A 5. The dynamic impedance is defined as |Z resistors (see Figure 2), the total dynamic impedance of the circuit is given by ------- - Z 1 OUT, TOT OUT I ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0 25°C unless otherwise specified) A Test Conditions I = 10mA (Fig.1) LED COMP 10mA, V ...

Page 5

... 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. ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 (Continued 25°C unless otherwise specified) A ...

Page 6

... REF 5 Figure (min.) Test Circuit REF F, LED I (LED REF Figure 3. I Test Circuit REF Figure 5. I Test Circuit CEO ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0 Figure (LED) I CEO (LED COMP R2 V REF Test Circuit REF / COMP I (OFF) 8 ...

Page 7

... Test Circuits (Continued + OUT 2.2k V OUT ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0 1mA 0 Figure 7. Frequency Response Test Circuit 0mA ( 1mA ( VCM _ + 10V P-P Figure 8. CMH and CML Test Circuit 0.47V A B www.fairchildsemi.com ...

Page 8

... T – AMBIENT TEMPERATURE ( C) A Fig. 12 – Off–State Current vs. Ambient Temperature 100 V = 37V -40 - – AMBIENT TEMPERATURE ( C) A ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 1.0 0.5 0.0 -0.5 -1.0 – 1.30 1.25 1.20 1.15 1.10 1. 100 0.9 ...

Page 9

... – FORWARD CURRENT (mA) LED Fig. 18 – Collector Current vs. Collector Voltage – COLLECTOR-EMITTER VOLTAGE (V) CE ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 (Continued 100 0 0.26 0.24 0.22 0. 0.18 0.16 0.14 0.12 0.10 - -0.32 -0. 20mA LED -0.36 -0.38 -0.40 ...

Page 10

... Typical Performance Curves ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 (Continued) Fig. 20 – Voltage Gain vs. Frequency VCC=10V IF=10mA 500 -10 -15 0 100 FREQUENCY (kHz 100 1000 www.fairchildsemi.com ...

Page 11

... A R TOP ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 Compensation The compensation pin of the FOD2741 provides the opportunity 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 typ- ical low-bandwidth systems, a 0.1µ ...

Page 12

... TYP Lead Coplanarity : 0.004 (0.10) MAX Note: All dimensions are in inches (millimeters) ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 0.4" Lead Spacing 0.200 (5.08) 0.140 (3.55) 15 MAX 0.300 (7.62) TYP 0.022 (0.56) 0.016 (0.41) 8-Pin DIP – ...

Page 13

... SDV Marking Information Definitions ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 Example Part Number FOD2741A Standard Through Hole FOD2741AS Surface Mount Lead Bend FOD2741ASD Surface Mount; Tape and Reel FOD2741AT 0.4" Lead Spacing FOD2741AV VDE0884 FOD2741ATV VDE0884; 0.4” Lead Spacing FOD2741ASV VDE0884 ...

Page 14

... Reflow Profile 300 250 200 150 100 50 0 ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0 User Direction of Feed Description 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 ...

Page 15

... Product Status Advance Information Formative / In Design Preliminary First Production No Identification Needed Full Production Obsolete Not In Production ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 PDP SPM™ FPS™ F-PFS™ Power-SPM™ ® FRFET PowerTrench SM Programmable Active Droop™ ...

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