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FOD2743A, FOD2743B, FOD2743C
Optically Isolated Error Amplifier
Features
Description
■ Optocoupler, precision reference and error amplifier in
The FOD2743 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%.
■
■
■
■
■
■
a single package
2.5V reference
CTR 50% to 100% at 1mA
5,000V RMS isolation
UL approval E90700, Vol. 2
CSA approval 1296837
VDE approval pending
BSI approval pending
Low temperature coefficient 50ppm/°C max
FOD2743A: tolerance 0.5%
FOD2743B: tolerance 1%
FOD2743C: tolerance 2%
Applications
■ Power supplies regulation
The Current Transfer Ratio (CTR) ranges from 50% to
100%. 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 converters.
When using the FOD2743, 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 an 8-pin dip white package.
■ DC to DC converters
Functional Bock Diagram
LED
1
Package Outlines
8 NC
8
COMP
2
7 C
GND
3
6 E
1
8
FB
4
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
5 NC
8
1
1
www.fairchildsemi.com
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
August 2008
Pin Number
Pin Name
Pin Description
1
LED
2
COMP
3
GND
4
FB
Voltage Feedback. This pin is the inverting input to the error amplifier
5
NC
Not connected
6
E
Phototransistor Emitter
7
C
Phototransistor Collector
8
NC
Anode LED. This pin is the input to the light emitting diode.
Error Amplifier Compensation. This pin is the output of the error amplifier. *
Ground
Not connected
*The compensation network must be attached between pins 2 and 4.
Typical Application
V1
FAN4803
PWM
Control
VO
FOD2743
7
1
2
6
4
3
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
R1
R2
www.fairchildsemi.com
2
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Pin Definitions
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.
Symbol
Parameter
Value
Units
TSTG
Storage Temperature
-40 to +125
°C
TOPR
Operating Temperature
-40 to +85
°C
TSOL
Lead Solder Temperature
260 for 10 sec.
°C
VLED
Input Voltage
37
V
ILED
Input DC Current
20
mA
VCEO
Collector-Emitter Voltage
70
V
VECO
Emitter-Collector Voltage
7
V
Collector Current
50
mA
PD1
Input Power Dissipation
145
mW
PD2
Transistor Power Dissipation
85
mW
145
mW
IC
PD3
Total Power Dissipation
(1)
Note:
1. See derating graph, Figure 21.
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
3
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Absolute Maximum Ratings (TA = 25°C unless otherwise specified)
Input Characteristics
Symbol
Parameter
VF
VREF
Test Conditions
LED Forward Voltage
ILED = 1mA, VCOMP = VFB (Fig.1)
Reference Voltage
ILED = 1mA, VCOMP = VFB
Device
Min. Typ. Max.
Unit
All
1.07
V
1.2
FOD2743A 2.482 2.495 2.508
V
FOD2743B 2.470 2.495 2.520
V
FOD2743C 2.450 2.500 2.550
VREF (DEV)(2) Deviation of VREF Over
Temperature(2)
∆VREF /
∆VCOMP
Ratio of VREF Variation
to the Output of the
Error Amplifier
TA = -25°C to +85°C
All
ILED = 1mA ∆VCOMP = 10V to VREF
All
4.5
∆VCOMP = 36V to 10V
V
17
mV
mV/V
-0.4
-2.7
-0.3
-2.0
Feedback Input Current ILED = 1mA, R1 = 10kΩ (Fig. 3)
All
2
4
µA
Deviation of IREF Over
Temperature
TA = -25°C to +85°C
All
1
1.2
µA
Minimum Drive Current VCOMP = VFB (Fig.1)
All
0.45
1.0
mA
I(OFF)
Off-State Error
Amplifier Current
VLED = 37V, VFB = 0 (Fig. 4)
All
0.001
1.0
µA
|ZOUT|
Error Amplifier Output
Impedance(3)
VCOMP = VREF, ILED = 1mA to 20mA,
f ≥ 1.0 kHz
All
0.15
0.5
Ω
IREF
IREF (DEV)(2)
ILED (MIN)
Output Characteristics
Symbol
ICEO
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
1
50
nA
Collector Dark Current
VCE = 10V (Fig. 5)
BVECO
Emitter-Collector Voltage Breakdown
IE = 100µA
7
10
V
BVCEO
Collector-Emitter Voltage Breakdown
IC = 1.0mA
70
100
V
Transfer Characteristics
Symbol Parameter
CTR
Current Transfer Ratio
VCE (SAT) Collector-Emitter Saturation
Voltage
Test Conditions
ILED = 1mA, VCOMP = VFB,
VCE = 5V (Fig. 6)
ILED = 1mA, VCOMP = VFB,
IC = 0.1mA (Fig. 6)
Min.
50
Typ.
Max.
Unit
100
%
0.4
V
Notes:
2. 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:
6
∆V REF
{ V REF ( DEV ) /V REF ( T A = 25°C ) } × 10
( ppm/°C ) = ---------------------------------------------------------------------------------------------------∆T A
where ∆TA is the rated operating free-air temperature range of the device.
3. 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:
∆V
R1
Z OUT, TOT = -------- ≈ Z OUT × 1 + -------∆I
R2
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
4
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Electrical Characteristics (TA = 25°C unless otherwise specified)
Isolation Characteristics
Symbol
II-O
Parameter
Test Conditions
Input-Output Insulation
Leakage Current
RH = 45%, TA = 25°C, t = 5s,
VI-O = 3000 VDC(4)
VISO
Withstand Insulation
Voltage
RH ≤ 50%, TA = 25°C, t = 1 min.(4)
RI-O
Resistance (Input to Output)
VI-O = 500 VDC(4)
Min.
Typ.
Max.
Unit
1.0
µA
5000
Vrms
Ω
1012
Switching Characteristics
Symbol
BW
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Bandwidth
(Fig. 7)
50
kHZ
CMH
Common Mode Transient
Immunity at Output HIGH
ILED = 0mA, Vcm = 10 VPP,
RL = 2.2kΩ(5) (Fig. 8)
1.0
kV/µs
CML
Common Mode Transient
Immunity at Output LOW
(ILED = 1 mA, Vcm = 10 VPP,
RL = 2.2 kΩ(5) (Fig. 8)
1.0
kV/µs
Notes:
4. 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.
5. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge
of the common 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.
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
5
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Electrical Characteristics (Continued) (TA = 25°C unless otherwise specified)
I(LED)
I(LED)
1
1
7
7
VF
2
2
V
4
V
R1
6
6
4
VCOMP
R2
VREF
VREF
3
3
Figure 2. ∆VREF / ∆VCOMP Test Circuit
Figure 1. VREF, VF, ILED (min.) Test Circuit
I(LED)
I(OFF)
1
7
1
7
IREF
2
2
6
4
V
6
V(LED)
4
V
R1
3
3
Figure 4. I(OFF) Test Circuit
Figure 3. IREF Test Circuit
1
I(LED)
ICEO
1
7
VCE
2
IC
7
VCE
2
6
4
V
6
4
VCOMP
VREF
3
3
Figure 5. ICEO Test Circuit
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
Figure 6. CTR, VCE(sat) Test Circuit
www.fairchildsemi.com
6
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Test Circuits
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Test Circuits (Continued)
VCC = +5V DC
IF = 1mA
RL
47Ω
1
8
1µF
VOUT
4
7
VIN
0.47V
0.1 VPP
6
2
5
3
Figure 7. Frequency Response Test Circuit.
VCC = +5V DC
IF = 0mA (A)
IF = 1mA (B)
R1
2.2kΩ
VOUT
8
1
7
4
6
2
5
3
_
A B
VCM
+
10VP-P
Figure 8. CMH and CML Test Circuit
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
7
Fig. 9a – LED Current vs. Cathode Voltage
Fig. 9b – LED Current vs. Cathode Voltage
1.0
TA = 25°C
VCOMP = VFB
ILED – SUPPLY CURRENT (mA)
ILED – SUPPLY CURRENT (mA)
15
10
5
0
-5
TA = 25°C
VCOMP = VFB
0.5
0.0
-0.5
-10
-15
-1
0
1
2
-1.0
–1
3
0
1
2
3
VCOMP – CATHODE VOLTAGE (V)
Fig. 10 – Reference Voltage Variation vs. Ambient Temperature
Fig. 11 – Reference Current vs Ambient Temperature
1.0
4.0
ILED = 1mA, 10mA
Normalized to TA = 25°C
0.8
IREF – REFERENCE CURRENT (µA)
∆VREF – REFERENCE VOLTAGE VARIATION (%)
VCOMP – CATHODE VOLTAGE (V)
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
ILED = 1mA, 10mA
R1 = 10kΩ
3.5
3.0
2.5
2.0
1.5
-0.8
-1.0
-40
-20
0
20
40
60
80
1.0
-40
100
-20
0
20
40
60
80
100
TA – AMBIENT TEMPERATURE (°C)
TA – AMBIENT TEMPERATURE (°C)
Fig. 12 – Off–State Current vs. Ambient Temperature
Fig. 13 – Forward Current vs. Forward Voltage
20
100
IF – FORWARD CURRENT (mA)
IOFF – OFF–STATE CURRENT (nA)
VCC = 37V
10
15
25°C
10
0°C
70°C
5
1
-40
-20
0
20
40
60
80
0.9
100
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
1.0
1.1
1.2
1.3
1.4
VF – FORWARD VOLTAGE (V)
TA – AMBIENT TEMPERATURE (°C)
www.fairchildsemi.com
8
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 15 – Collector Current vs. Ambient Temperature
Fig. 14 – Dark Current vs. Ambient Temperature
32
VCE = 10V
1.6
VCE = 5V
IC – COLLECTOR CURRENT (mA)
ILED = 5, 10, 20mA
ICEO – DARK CURRENT (nA)
28
1000
100
10
1
0.1
-40
-20
0
20
40
60
80
1.4
ILED = 20mA
24
20
16
0.8
ILED = 10mA
12
0.6
ILED = 5mA
8
0.4
4
0.2
-20
TA – AMBIENT TEMPERATURE (°C)
Fig. 16 – Current Transfer Ratio vs. LED Current
0
20
40
60
TA – AMBIENT TEMPERATURE (°C)
0.0
100
80
Fig. 17 – Saturation Voltage vs. Ambient Temperature
0.26
160
VCE = 5V
VCE(sat) – SATURATION VOLTAGE (V)
(IC/IF) – CURRENT TRANSFER RATIO (%)
1.0
ILED = 1mA
0
-40
100
1.2
IC – COLLECTOR CURRENT (mA)
ILED = 1mA
10000
140
120
25°C
100
0°C
80
-40°C
60
70°C
40
100°C
20
0
0.1
0.24
0.22
0.20
ILED = 10mA
IC = 2.5mA
0.18
0.16
ILED = 1mA
IC = 0.1mA
0.14
0.12
0.10
0.08
0.06
-40
1
10
ILED – FORWARD CURRENT (mA)
-20
0
20
40
60
80
100
TA – AMBIENT TEMPERATURE (°C)
Fig. 19 – Rate of Change Vref to Vout vs. Temperature
Fig. 18 – Collector Current vs. Collector Voltage
-0.32
35
-0.34
DELTA Vref / DELTA Vout ( mV/V)
IC – COLLECTOR CURRENT (mA)
TA = 25°C
30
ILED = 20mA
25
20
15
ILED = 10mA
10
ILED = 5mA
5
-0.36
-0.38
-0.40
-0.42
-0.44
ILED = 1mA
0
0
1
2
3
4
5
6
7
8
9
-0.46
-60
10
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
VCE – COLLECTOR-EMITTER VOLTAGE (V)
www.fairchildsemi.com
9
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
Fig. 20 – Voltage Gain vs. Frequency
5
VOLTAGE GAIN (dB)
VCC = 10V
0
IF = 10mA
R L = 500 Ω
IF = 1mA
RL = 2.4k Ω
-5
IF = 10mA
RL = 100 Ω
IF = 10mA
R L = 1k Ω
-10
-15
1
10
100
FREQUENCY (kHz)
1000
Fig. 21 – Package Power Dissipation
vs Ambient Temperature
PACKAGE POWER DISSIPATION (mW)
200
150
100
50
0
-40
-20
0
20
40
60
80
100
Ta – AMBIENT TEMPERATURE (°C)
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
10
Compensation
The FOD2743 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 KA431 shunt voltage regulator plus the CNY17F-X optocoupler.
The compensation pin of the FOD2743 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 typical low-bandwidth systems, a 0.1µF capacitor
may be used. For converters with more stringent
requirements, a network should be designed based on
measurements of the system’s loop. An excellent reference for this process may be found in “Practical Design
of Power Supplies” by Ron Lenk, IEEE Press, 1998.
Powering the Secondary Side
The LED pin in the FOD2743 powers the secondary
side, and in particular provides the current to run the
LED. The actual structure of the FOD2743 dictates the
minimum voltage that can be applied to the LED pin: The
error amplifier output has a minimum of the reference
voltage, and the LED is in series with that. Minimum voltage applied to the LED pin is thus 2.5V + 1.2V = 3.7V.
This voltage can be generated either directly from the
output of the converter, or else from a slaved secondary
winding. The secondary winding will not affect regulation, as the input to the FB pin may still be taken from the
output winding.
Secondary Ground
The GND pin should be connected to the secondary
ground of the converter.
No Connect Pins
The NC pins have no internal connection. They should
not have any connection to the secondary side, as this
may compromise the isolation structure.
The LED pin needs to be fed through a current limiting
resistor. The value of the resistor sets the amount of current through the LED, and thus must be carefully
selected in conjunction with the selection of the primary
side resistor.
Photo-Transistor
Feedback
The value of the pull-up resistor, and the current limiting
resistor feeding the LED, must be carefully selected to
account for voltage range accepted by the PWM IC, and
for the variation in current transfer ratio (CTR) of the
opto-isolator itself.
The Photo-transistor is the output of the FOD2743. In a
normal configuration the collector will be attached to a
pull-up resistor and the emitter grounded. There is no
base connection necessary.
Output voltage of a converter is determined by selecting
a resistor divider from the regulated output to the FB pin.
The FOD2743 attempts to regulate its FB pin to the reference voltage, 2.5V. The ratio of the two resistors
should thus be:
Example: The voltage feeding the LED pins is +12V, the
voltage feeding the collector pull-up is +10V, and the
PWM IC is the Fairchild FAN4803, which has a 5V reference. If we select a 10kΩ resistor for the LED, the maximum current the LED can see is:
R TOP
V OUT
------------------------- = -------------–1
R BOTTOM
V REF
The absolute value of the top resistor is set by the input
offset current of 5.2µA. To achieve 0.5% accuracy, the
resistance of RTOP should be:
(12V – 4V) / 10kΩ = 800µA.
The CTR of the opto-isolator is a minimum of 50%, so
the minimum collector current of the photo-transistor
when the diode is full on is 400µA. The collector resistor
must thus be such that:
V OUT – 2.5
----------------------------- > 1040µA
R TOP
10V – 5V
----------------------------------- < 400µA or R COLLECTOR > 12.5kΩ;
R COLLECTOR
select 20kΩ to allow some margin.
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
11
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
The FOD2743
Option
Example Part Number
Description
No Option
FOD2743A
S
FOD2743AS
SD
FOD2743ASD
T
FOD2743AT
0.4" Lead Spacing
V
FOD2743AV
VDE0884
TV
FOD2743ATV
VDE0884; 0.4” Lead Spacing
SV
FOD2743ASV
VDE0884; Surface Mount
SDV
FOD2743ASDV
Standard Through Hole
Surface Mount Lead Bend
Surface Mount; Tape and Reel
VDE0884; Surface Mount; Tape and Reel
Marking Information
1
V
3
2743A
2
XX YY B
6
4
5
Definitions
1
Fairchild logo
2
Device number
3
VDE mark (Note: Only appears on parts ordered with VDE
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
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
12
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Ordering Information
D0
P0
t
K0
P2
E
F
A0
W1
d
t
P
User Direction of Feed
Symbol
W
W
B0
Description
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
A0
Pocket Dimensions
12.0 ± 0.1
10.30 ±0.20
B0
10.30 ±0.20
K0
4.90 ±0.20
W1
d
R
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
Cover Tape Width
1.6 ± 0.1
Cover Tape Thickness
0.1 max
Max. Component Rotation or Tilt
10°
Min. Bending Radius
30
www.fairchildsemi.com
13
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Carrier Tape Specifications
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Reflow Profile
• Peak reflow temperature
• Time of temperature higher than 245°C
• Number of reflows
260°C (package surface temperature)
40 seconds or less
Three
10 s
300
260°
245°
Temperature (°C)
250
200
150
40 s
100
50
50
100
150
Time (s)
200
250
300
Figure 22. Recommended IR Reflow Profile
©2004 Fairchild Semiconductor Corporation
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1
www.fairchildsemi.com
14
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