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FOD2742A, FOD2742B, FOD2742C
Optically Isolated Error Amplifier
Features
Description
■ Optocoupler, precision reference and error amplifier in
The FOD2742 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%.
■
■
■
■
■
■
■
■
■
single package
2.5V reference
CTR 100% to 200%
2,500V RMS isolation
UL approval E90700, Volume 2
BSI approval 8661, 8662
VDE approval 136616
CSA approval 1113643
Low temperature coefficient 50 ppm/°C max.
FOD2742A: tolerance 0.5%
FOD2742B: tolerance 1%
FOD2742C: tolerance 2%
Applications
■ Power supplies regulation
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 converters.
When using the FOD2742, 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 small outline
package.
■ DC to DC converters
Schematic
NC 1
Package Outline
8 LED
C 2
7 FB
E 3
6 COMP
NC 4
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
5 GND
www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
April 2009
Pin Number
Pin Name
1
NC
2
C
Phototransistor Collector
3
E
Phototransistor Emitter
4
NC
5
GND
6
COMP
7
FB
8
LED
Functional Description
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.
Typical Application
V1
FAN4803
PWM
Control
VO
FOD2742
2
8
6
3
7
5
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
R1
R2
www.fairchildsemi.com
2
FOD2742A, FOD2742B, FOD2742C — 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
-25 to +85
°C
Reflow Temperature Profile (refer to 15)
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
IC
Input Power Dissipation(1)
145
mW
PD2
Transistor Power Dissipation(2)
85
mW
145
mW
PD3
Total Power
Dissipation(3)
Notes:
1. Derate linearly from 25°C at a rate of 2.42mW/°C
2. Derate linearly from 25°C at a rate of 1.42mW/°C.
3. Derate linearly from 25°C at a rate of 2.42mW/°C.
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
3
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Absolute Maximum Ratings (TA = 25°C unless otherwise specified)
Input Characteristics
Symbol
VF
VREF
Parameter
Device Min.
LED Forward Voltage
ILED = 10mA, VCOMP = VFB (Fig. 1)
All
Reference Voltage
ILED = 10mA, VCOMP = VFB (Fig. 1)
A
B
C
VREF (DEV) Deviation of VREF Over
Temperature
∆VRE
∆VCOMP
Test Conditions
TA = -25°C to +85°C (Fig. 1)
Ratio of VREF Variation to
the Output of the Error
Amplifier
ILED = 10mA
(Fig. 2)
∆VCOMP = 10V to VREF
All
All
∆VCOMP = 36V to 10V
Typ.
Max. Unit
1.20
1.5
V
2.482
2.495
2.508
V
2.470
2.495
2.520
V
2.450
2.500
2.550
V
3.5
17
mV
-0.5
-2.7
-0.3
-2.0
mV/
V
Feedback Input Current
ILED = 10mA, R1 = 10KΩ (Fig. 3)
All
2.2
4
µA
IREF (DEV)
Deviation of IREF Over
Temperature
TA = -25°C to +85°C (Fig. 3)
All
1.0
1.2
µA
ILED (MIN)
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
0.01
1.0
µA
|ZOUT|
Error Amplifier Output
Impedance (see note 2)
VCOMP = VREF, ILED = 1mA to 20mA,
f ≥ 1.0kHz
All
0.15
0.5
Ω
IREF
Notes:
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:
6
{ V REF ( DEV ) /V REF ( T A = 25°C ) } × 10
∆V REF ( ppm/°C ) = ---------------------------------------------------------------------------------------------------∆T A
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:
∆V
R1
Z OUT, TOT = -------- ≈ Z OUT × 1 + -------∆I
R2
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
4
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Electrical Characteristics (TA = 25°C unless otherwise specified)
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
120
V
Min.
Typ.
Max.
Unit
100
140
200
%
0.16
0.4
V
Typ.
Max.
Unit
1.0
µA
Transfer Characteristics
Symbol
CTR
VCE (SAT)
Parameter
Test Conditions
Current Transfer Ratio
ILED = 10mA, VCOMP = VFB,
VCE = 5V (Fig. 6)
Collector-Emitter
Saturation Voltage
ILED = 10mA, VCOMP = VFB,
IC = 2.5mA (Fig. 6)
Isolation Characteristics
Symbol
Parameter
Test Conditions
Input-Output Insulation
Leakage Current
RH = 45%, TA = 25°C, t = 5s,
VI-O = 3000 VDC (Note 1)
VISO
Withstand Insulation Voltage
RH ≤ 50%, TA = 25°C,
t = 1 min. (Note 1)
RI-O
Resistance (Input to Output)
VI-O = 500 VDC (Note 1)
II-O
Min.
2500
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 (Fig. 8) (Note 2)
1.0
kV/µs
CML
Common Mode Transient
Immunity at Output LOW
ILED = 10mA, Vcm = 10 VPP
RL = 2.2kΩ (Fig. 8) (Note 2)
1.0
kV/µs
Notes:
1. 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.
2. 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.
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
5
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Electrical Characteristics (TA = 25°C unless otherwise specified) (Continued)
I(LED)
I(LED)
8
8
2
2
VF
6
R1
3
V
7
V
6
3
7
VCOMP
R2
VREF
VREF
5
5
Figure 2. ∆VREF/∆VCOMP Test Circuit
Figure 1. VREF, VF, ILED (min) Test Circuit
I(LED)
I(OFF)
8
8
2
2
IREF
6
6
3
7
V
3
V(LED)
7
V
R1
5
5
Figure 4. I(OFF) Test Circuit
Figure 3. IREF Test Circuit
8
I(LED)
ICEO
8
2
VCE
6
I(C)
2
VCE
6
3
7
V
3
7
VCOMP
VREF
5
5
Figure 5. ICEO Test Circuit
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
Figure 6. CTR, VCE(sat) Test Circuit
www.fairchildsemi.com
6
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Test Circuits
VCC = +5V DC
IF = 10 mA
RL
1
47Ω
8
1µf
VOUT
2
7
VIN
0.47V
0.1 VPP
3
6
4
5
Figure 7. Frequency Response Test Circuit
VCC = +5V DC
IF = 0 mA (A)
IF = 10 mA (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
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
7
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Test Circuits (Continued)
Fig. 9a LED Current vs. Cathode Voltage
Fig. 9b LED Current vs. Cathode Voltage
1.0
TA = 25°C
VCOMP = VFB
10
ILED – SUPPLY CURRENT (mA)
ILED – SUPPLY CURRENT (mA)
15
5
0
-5
-10
-15
0.5
0.0
-0.5
-1.0
-1
0
1
3
2
TA = 25°C
VCOMP = VFB
-1
0
VCOMP – CATHODE VOLTAGE (V)
1
3
2
VCOMP – CATHODE VOLTAGE (V)
Fig. 10 Reference Voltage vs. Ambient Temperature
Fig. 11 Reference Current vs Ambient Temperature
2.510
ILED = 10mA
IREF – REFERENCE CURRENT (µA)
VREF – REFERENCE VOLTAGE (V)
2.508
ILED = 10mA
R1 = 10kΩ
2.506
2.504
2.502
2.500
2.498
2.496
2.494
3
2
2.492
2.490
-40
-20
0
20
40
60
80
-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
IF – FORWARD CURRENT (mA)
IOFF – OFF-STATE CURRENT (nA)
VLED = 37V
100
10
1
-40
-20
0
20
40
60
80
25°C
10
0°C
70°C
5
0.9
100
1.0
1.1
1.2
1.3
1.4
VF – FORWARD VOLTAGE (V)
TA – AMBIENT TEMPERATURE (°C)
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
15
www.fairchildsemi.com
8
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 15 Collector Current vs. Ambient Temperature
Fig. 14 Dark Current vs. Ambient Temperature
30
VCE = 10V
VCE = 5V
IC – COLLECTOR CURRENT (mA)
ICEO – DARK CURRENT (nA)
1000
100
10
1
25
ILED = 20mA
20
ILED = 10mA
15
10
ILED = 5mA
5
ILED = 1mA
0
0.1
-40
-20
0
20
40
60
80
0
100
10
20
Fig. 16 Current Transfer Ratio vs. LED Current
50
60
70
80
90
100
Fig. 17 Saturation Voltage vs. Ambient Temperature
0.26
160
VCE = 5V
VCE(sat) – SATURATION VOLTAGE (V)
(IC/IF) – CURRENT TRANSFER RATIO (%)
40
TA – AMBIENT TEMPERATURE (°C)
TA – AMBIENT TEMPERATURE (°C)
0°C
140
25°C
120
70°C
100
80
60
1
10
ILED – FORWARD CURRENT (mA)
0.24
100
ILED = 10mA
IC = 2.5mA
0.22
0.20
0.18
0.16
0.14
0.12
0.10
-40
40
-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
35
-0.22
TA = 25°C
-0.24
30
ILED = 20mA
-0.26
25
∆Vref /∆Vout ( mV/V)
IC – COLLECTOR CURRENT (mA)
30
20
ILED = 10mA
15
10
ILED = 5mA
-0.28
-0.30
-0.32
-0.34
-0.36
-0.38
-0.40
5
-0.42
ILED = 1mA
0
0
1
2
3
4
5
6
7
8
VCE – COLLECTOR-EMITTER VOLTAGE (V)
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
9
-0.44
-40
10
-20
0
20
40
60
80
100
TEMPERATURE (°C)
www.fairchildsemi.com
9
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
Fig. 20 Voltage Gain vs. Frequency
VOLTAGE GAIN (dB)
5
VCC = 10V
IF = 10mA
0
RL = 100Ω
RL = 500Ω
-5
RL = 1kΩ
-10
-15
1
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
10
100
FREQUENCY (kHz)
1000
www.fairchildsemi.com
10
Compensation
The FOD2742 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 FOD2742 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 FOD2742 powers the secondary
side, and in particular provides the current to run the
LED. The actual structure of the FOD2742 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 + 1.5V = 4.0V.
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
The Photo-transistor is the output of the FOD2742. In a
normal configuration the collector will be attached to a
pull-up resistor and the emitter grounded. There is no
base connection necessary.
Feedback
Output voltage of a converter is determined by selecting
a resistor divider from the regulated output to the FB pin.
The FOD2742 attempts to regulate its FB pin to the
reference voltage, 2.5V. The ratio of the two resistors
should thus be:
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.
R TOP
V OUT
------------------------- = -------------–1
R BOTTOM
V REF
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 KA1H0680, which has a 5V
reference. If we select a 10KV resistor for the LED, the
maximum current the LED can see is:
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.
V OUT – 2.5
----------------------------- > 1040µA
R TOP
The CTR of the opto-isolator is a minimum of 100%, so
the minimum collector current of the photo-transistor
when the diode is full on is also 800µA. The collector
resistor must thus be such that:
10V – 5V
----------------------------------- < 800µA or R COLLECTOR > 6.25KΩ;
R COLLECTOR
select 12KΩ to allow some margin.
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
11
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
The FOD2742
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Ordering Information
Option
Order Entry Identifier
V
V
R2
R2
R2V
R2V
Description
VDE 0884
Tape and reel (2500 units per reel)
VDE 0884, Tape and reel (2500 units per reel)
Marking Information
1
2742A
V
X YY S
3
4
2
6
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
One digit year code, e.g., ‘3’
5
Two digit work week ranging from ‘01’ to ‘53’
6
Assembly package code
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
12
8.0 ± 0.10
2.0 ± 0.05
3.50 ± 0.20
0.30 MAX
Ø1.5 MIN
1.75 ± 0.10
4.0 ± 0.10
5.5 ± 0.05
8.3 ± 0.10
5.20 ± 0.20
0.1 MAX
6.40 ± 0.20
12.0 ± 0.3
Ø1.5 ± 0.1
User Direction of Feed
Dimensions in mm
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
www.fairchildsemi.com
13
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Carrier Tape Specifications
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Reflow Profile
Temperature (°C)
TP
260
240
TL
220
200
180
160
140
120
100
80
60
40
20
0
Max. Ramp-up Rate = 3°C/S
Max. Ramp-down Rate = 6°C/S
tP
Tsmax
tL
Preheat Area
Tsmin
ts
120
240
360
Time 25°C to Peak
Time (seconds)
Profile Freature
Pb-Free Assembly Profile
Temperature Min. (Tsmin)
150°C
Temperature Max. (Tsmax)
200°C
Time (tS) from (Tsmin to Tsmax)
60–120 seconds
Ramp-up Rate (tL to tP)
3°C/second max.
Liquidous Temperature (TL)
217°C
Time (tL) Maintained Above (TL)
60–150 seconds
Peak Body Package Temperature
260°C +0°C / –5°C
Time (tP) within 5°C of 260°C
30 seconds
Ramp-down Rate (TP to TL)
6°C/second max.
Time 25°C to Peak Temperature
©2003 Fairchild Semiconductor Corporation
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
8 minutes max.
www.fairchildsemi.com
14
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