Fairchild FOD2741CV Optically isolated error amplifier Datasheet

FOD2741A, FOD2741B, FOD2741C
Optically Isolated Error Amplifier
Features
Description
■ Optocoupler, precision reference and error amplifier in
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%.
■
■
■
■
■
■
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%
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 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.
■ DC to DC converters
Functional Bock Diagram
NC
Package Outlines
1
8 LED
C
2
7 FB
E
3
6 COMP
8
1
8
NC
4
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
5 GND
8
1
1
www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
August 2008
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.
Typical Application
V1
FAN4803
PWM
Control
VO
FOD2741
2
8
6
3
7
5
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
R1
R2
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2
FOD2741A, FOD2741B, FOD2741C — 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
30
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.
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
3
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Absolute Maximum Ratings (TA = 25°C unless otherwise specified)
Input Characteristics
Symbol
VF
VREF
Parameter
Test Conditions
LED Forward Voltage
ILED = 10mA, VCOMP = VFB (Fig.1)
Reference Voltage
ILED = 10mA, VCOMP = VFB
Device
IREF
IREF (DEV)(4) Deviation of IREF Over
Temperature
ILED (MIN)
1.5
V
FOD2741A
2.482
2.495
2.508
V
FOD2741B
2.470
2.495
2.520
V
FOD2741C 2.450
2.500
2.550
V
4.5
17
mV
mV/V
All
Ratio of VREF Variation ILED = 10mA ∆VCOMP = 10V to VREF
to the Output of the
∆VCOMP = 36V to 10V
Error Amplifier
Feedback Input
Current
Typ. Max. Unit
All
VREF (DEV)(4) Deviation of VREF Over TA = -25°C to +85°C
Temperature
∆VREF/
∆VCOMP
Min.
All
-1.0
-2.7
-0.5
-2.0
ILED = 10mA, R1 = 10kΩ (Fig. 3)
All
1.5
4
µA
TA = -25°C to +85°C
All
0.4
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
0.05
1.0
µA
|ZOUT|
Error Amplifier Output
impedance(5)
VCOMP = VREF, ILED = 1mA to 20mA,
f ≥ 1.0 kHz
All
0.15
0.5
Ω
Output Characteristics
Symbol
ICEO
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
50
nA
Collector Dark Current
VCE = 10V (Fig. 5)
BVECO
Emitter-Collector Voltage Breakdown
IE = 100µA
7
V
BVCEO
Collector-Emitter Voltage Breakdown
IC = 1.0mA
70
V
Transfer Characteristics
Symbol Parameter
CTR
Current Transfer Ratio
VCE (SAT) Collector-Emitter Saturation
Voltage
Test Conditions
ILED = 10mA, VCOMP = VFB,
VCE = 5V (Fig. 6)
ILED = 10mA, VCOMP = VFB,
IC = 2.5mA (Fig. 6)
Min.
100
Typ.
Max.
Unit
200
%
0.4
V
Notes:
4. 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.
5. 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
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
4
FOD2741A, FOD2741B, FOD2741C — 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(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. 7)
50
kHZ
CMH
Common Mode Transient
Immunity at Output HIGH
ILED = 0mA, Vcm = 10 VPP,
RL = 2.2kΩ(7) (Fig. 8)
1.0
kV/µs
CML
Common Mode Transient
Immunity at Output LOW
(ILED = 1mA, Vcm = 10 VPP,
RL = 2.2kΩ(7) (Fig. 8)
1.0
kV/µs
Notes:
6. 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.
7. 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
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
5
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Electrical Characteristics (Continued) (TA = 25°C unless otherwise specified)
I(LED)
I(LED)
8
8
2
2
VF
6
6
V
7
V
R1
3
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
IC
2
VCE
6
3
7
V
3
7
VCOMP
VREF
5
5
Figure 5. ICEO Test Circuit
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
Figure 6. CTR, VCE(sat) Test Circuit
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6
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Test Circuits
FOD2741A, FOD2741B, FOD2741C — 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
FOD2741A, FOD2741B, FOD2741C 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
VCOMP – CATHODE VOLTAGE (V)
Fig. 10 – Reference Voltage vs. Ambient Temperature
2
3
Fig. 11 – Reference Current vs Ambient Temperature
2.510
1.30
ILED = 10mA
2.508
IREF – REFERENCE CURRENT (µA)
VREF – REFERENCE VOLTAGE (V)
1
VCOMP – CATHODE VOLTAGE (V)
2.506
2.504
2.502
2.500
2.498
2.496
2.494
ILED = 10mA
R1 = 10kΩ
1.25
1.20
1.15
1.10
2.492
2.490
-40
-20
0
20
40
60
80
1.05
-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
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
1.0
1.1
1.2
1.3
1.4
VF – FORWARD VOLTAGE (V)
TA – AMBIENT TEMPERATURE (°C)
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FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 14 – Dark Current vs. Ambient Temperature
Fig. 15 – Collector Current vs. Ambient Temperature
30
VCE = 10V
IC – COLLECTOR CURRENT (mA)
ICEO – DARK CURRENT (nA)
10000
1000
100
10
1
VCE = 5V
25
ILED = 20mA
20
15
ILED = 10mA
10
ILED = 6mA
5
ILED = 1mA
0.1
-40
-20
0
20
40
60
80
0
100
0
10
20
30
TA – AMBIENT TEMPERATURE (°C)
40
50
60
70
80
90
100
TA – AMBIENT TEMPERATURE (°C)
Fig. 16 – Current Transfer Ratio vs. LED Current
Fig. 17 – Saturation Voltage vs. Ambient Temperature
VCE = 5V
140
VCE(sat) – SATURATION VOLTAGE (V)
(IC/IF) – CURRENT TRANSFER RATIO (%)
0.26
120
0°C
100
25°C
80
70°C
60
5
10
15
20
25
30
35
40
45
0.22
0.20
0.18
0.16
0.14
0.12
0.10
-40
40
0
0.24
50
-20
ILED – FORWARD CURRENT (mA)
0
20
60
40
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
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
VCE – COLLECTOR-EMITTER VOLTAGE (V)
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FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
FOD2741A, FOD2741B, FOD2741C — 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
RL = 500Ω
RL = 1kΩ
-10
-15
0.1
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
1
10
FREQUENCY (kHz)
100
1000
www.fairchildsemi.com
10
Compensation
The FOD2741 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 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 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 FOD2741 powers the secondary
side, and in particular provides the current to run the
LED. The actual structure of the FOD2741 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
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 FOD2741. 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 FOD2741 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 KA1H0680, 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 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:
V OUT – 2.5
----------------------------- > 1040µA
R TOP
10V – 5V
----------------------------------- < 800µA or R COLLECTOR > 6.25kΩ;
R COLLECTOR
select 12kΩ to allow some margin.
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
11
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
The FOD2741
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 (3.05)
0.300 (7.62)
TYP
0.022 (0.56)
0.016 (0.41)
0.016 (0.40)
0.008 (0.20)
0.100 (2.54) TYP
Surface Mount
0° to 15°
0.400 (10.16)
TYP
8-Pin DIP – Land Pattern
0.390 (9.91)
0.370 (9.40)
4
3
2
1
0.070 (1.78)
PIN 1
ID.
0.060 (1.52)
0.270 (6.86)
0.250 (6.35)
5
6
7
0.100 (2.54)
8
0.295 (7.49)
0.070 (1.78)
0.045 (1.14)
0.020 (0.51)
MIN
0.022 (0.56)
0.016 (0.41)
0.100 (2.54)
TYP
Lead Coplanarity : 0.004 (0.10) MAX
0.415 (10.54)
0.300 (7.62)
TYP
0.030 (0.76)
0.016 (0.41)
0.008 (0.20)
0.045 (1.14)
0.315 (8.00)
MIN
0.405 (10.30)
MAX.
Note:
All dimensions are in inches (millimeters)
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
12
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Package Dimensions
Option
Example Part Number
Description
No Option
FOD2741A
S
FOD2741AS
SD
FOD2741ASD
T
FOD2741AT
0.4" Lead Spacing
V
FOD2741AV
VDE0884
TV
FOD2741ATV
VDE0884; 0.4” Lead Spacing
SV
FOD2741ASV
VDE0884; Surface Mount
SDV
FOD2741ASDV
Standard Through Hole
Surface Mount Lead Bend
Surface Mount; Tape and Reel
VDE0884; Surface Mount; Tape and Reel
Marking Information
1
V
3
2741A
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
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
13
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Ordering Information
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. Component Rotation or Tilt
10°
Min. Bending Radius
30
Reflow Profile
245 C, 10–30 s
Temperature (°C)
300
260 C peak
250
200
150
Time above 183C, <160 sec
100
50
Ramp up = 2–10C/sec
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time (Minute)
• Peak reflow temperature: 260 C (package surface temperature)
• Time of temperature higher than 183 C for 160 seconds or less
• One time soldering reflow is recommended
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
14
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Carrier Tape Specifications
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PRODUCT STATUS DEFINITIONS
Definition of Terms
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Definition
Datasheet contains the design specifications for product development. Specifications may change in
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Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
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Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor. The
datasheet is for reference information only.
Rev. I35
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
15
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
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