FOD2742BR2 [ONSEMI]

8 引脚 SOIC 误差放大器光耦合器;
FOD2742BR2
型号: FOD2742BR2
厂家: ONSEMI    ONSEMI
描述:

8 引脚 SOIC 误差放大器光耦合器

局域网 放大器 输出元件 光电
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April 2009  
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  
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.  
CSA approval 1113643  
Low temperature coefficient 50 ppm/°C max.  
FOD2742A: tolerance 0.5%  
FOD2742B: tolerance 1%  
FOD2742C: tolerance 2%  
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.  
Applications  
Power supplies regulation  
DC to DC converters  
Schematic  
Package Outline  
NC  
LED  
1
8
FB  
2
3
4
7
6
5
C
E
COMP  
GND  
NC  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
Pin Definitions  
Pin Number  
Pin Name  
Functional Description  
1
2
3
4
5
6
7
8
NC  
C
Not connected  
Phototransistor Collector  
Phototransistor Emitter  
Not connected  
E
NC  
GND  
COMP  
FB  
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.  
LED  
*The compensation network must be attached between pins 6 and 7.  
Typical Application  
FAN4803  
PWM  
Control  
V1  
VO  
FOD2742  
2
3
8
6
7
5
R1  
R2  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
2
Absolute Maximum Ratings (T = 25°C unless otherwise specified)  
A
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  
T
Storage Temperature  
-40 to +125  
-25 to +85  
°C  
°C  
STG  
T
Operating Temperature  
Reflow Temperature Profile (refer to 15)  
Input Voltage  
OPR  
V
37  
20  
70  
7
V
LED  
I
Input DC Current  
mA  
V
LED  
V
V
Collector-Emitter Voltage  
Emitter-Collector Voltage  
Collector Current  
CEO  
V
ECO  
I
50  
145  
85  
145  
mA  
mW  
mW  
mW  
C
(1)  
PD1  
PD2  
PD3  
Input Power Dissipation  
(2)  
Transistor Power Dissipation  
(3)  
Total Power Dissipation  
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
Electrical Characteristics (T = 25°C unless otherwise specified)  
A
Input Characteristics  
Symbol  
Parameter  
LED Forward Voltage  
Reference Voltage  
Test Conditions  
Device Min. Typ. Max. Unit  
V
I
I
= 10mA, V  
= 10mA, V  
= V (Fig. 1)  
All  
A
1.20  
1.5  
V
V
F
LED  
COMP  
COMP  
FB  
V
= V (Fig. 1)  
2.482 2.495 2.508  
2.470 2.495 2.520  
2.450 2.500 2.550  
REF  
LED  
FB  
B
V
C
V
V
Deviation of V  
Temperature  
Over  
T = -25°C to +85°C (Fig. 1)  
All  
3.5  
17  
mV  
REF (DEV)  
REF  
A
V  
Ratio of V  
the Output of the Error  
Amplifier  
Variation to  
I
= 10mA V  
= 10V to V  
REF  
All  
-0.5  
-0.3  
-2.7  
-2.0  
mV/  
V
RE  
REF  
LED  
COMP  
COMP  
V  
(Fig. 2)  
COMP  
V  
= 36V to 10V  
I
Feedback Input Current  
I
= 10mA, R = 10K(Fig. 3)  
All  
All  
2.2  
1.0  
4
µA  
µA  
REF  
LED  
1
I
Deviation of I  
Temperature  
Over  
T = -25°C to +85°C (Fig. 3)  
1.2  
REF (DEV)  
REF  
A
I
Minimum Drive Current  
V
V
= V (Fig. 1)  
All  
All  
0.45  
0.01  
1.0  
1.0  
mA  
µA  
LED (MIN)  
COMP  
FB  
I
Off-state Error Amplifier  
Current  
= 37V, V = 0 (Fig. 4)  
LED FB  
(OFF)  
|Z  
|
Error Amplifier Output  
Impedance (see note 2)  
V
= V , I = 1mA to 20mA,  
REF LED  
All  
0.15  
0.5  
OUT  
COMP  
f 1.0kHz  
Notes:  
1. The deviation parameters V  
and I  
are defined as the differences between the maximum and  
REF(DEV)  
REF(DEV)  
minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the  
reference input voltage, V , is defined as:  
REF  
{VREF(DEV)/VREF(TA = 25°C)} × 106  
VREF (ppm/°C) = ----------------------------------------------------------------------------------------------------  
TA  
where T is the rated operating free-air temperature range of the device.  
A
2. The dynamic impedance is defined as |Z  
| = V  
/I  
. When the device is operating with two external  
OUT  
COMP LED  
resistors (see Figure 2), the total dynamic impedance of the circuit is given by:  
V R1  
ZOUT, TOT = ------- ZOUT × 1 + -------  
I  
R2  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
4
Electrical Characteristics (T = 25°C unless otherwise specified) (Continued)  
A
Output Characteristics  
Symbol  
Parameter  
Test Conditions  
Min.  
Typ.  
Max.  
Unit  
I
Collector Dark Current  
V
= 10V (Fig. 5)  
1
50  
nA  
V
CEO  
CE  
BV  
Emitter-Collector Voltage  
Breakdown  
I = 100µA  
7
10  
ECO  
E
BV  
Collector-Emitter Voltage  
Breakdown  
I = 1.0mA  
70  
120  
V
CEO  
C
Transfer Characteristics  
Symbol  
Parameter  
Test Conditions  
Min.  
Typ.  
Max.  
Unit  
CTR  
Current Transfer Ratio  
I
= 10mA, V  
= V ,  
FB  
100  
140  
200  
%
LED  
COMP  
V
= 5V (Fig. 6)  
CE  
V
Collector-Emitter  
Saturation Voltage  
I
= 10mA, V  
= V ,  
FB  
0.16  
0.4  
V
CE (SAT)  
LED  
COMP  
I = 2.5mA (Fig. 6)  
C
Isolation Characteristics  
Symbol Parameter  
Test Conditions  
Min.  
Typ.  
Max.  
Unit  
I
Input-Output Insulation  
Leakage Current  
RH = 45%, T = 25°C, t = 5s,  
1.0  
µA  
I-O  
A
V
= 3000 VDC (Note 1)  
I-O  
V
Withstand Insulation Voltage RH 50%, T = 25°C,  
2500  
Vrms  
ISO  
A
t = 1 min. (Note 1)  
12  
R
Resistance (Input to Output)  
V
= 500 VDC (Note 1)  
10  
I-O  
I-O  
Switching Characteristics  
Symbol Parameter  
Test Conditions  
Min.  
Typ.  
Max.  
Unit  
B
Bandwidth  
Fig. 7  
= 0mA,  
50  
kHz  
W
CMH  
Common Mode Transient  
Immunity at Output HIGH  
I
V
= 10 V  
PP  
1.0  
kV/µs  
LED  
cm  
RL = 2.2k(Fig. 8) (Note 2)  
= 10mA, = 10 V  
PP  
CML  
Common Mode Transient  
Immunity at Output LOW  
I
V
1.0  
kV/µs  
LED  
cm  
RL = 2.2k(Fig. 8) (Note 2)  
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
Test Circuits  
I(LED)  
I(LED)  
8
2
3
8
2
3
VF  
6
7
R1  
6
7
V
V
VCOMP  
VREF  
R2  
VREF  
5
5
Figure 1. VREF, VF, ILED (min) Test Circuit  
Figure 2. VREF/VCOMP Test Circuit  
I(LED)  
I(OFF)  
8
2
3
8
2
IREF  
6
6
3
V(LED)  
7
7
V
V
R1  
5
5
Figure 3. IREF Test Circuit  
Figure 4. I(OFF) Test Circuit  
I(LED)  
ICEO  
I(C)  
8
8
2
2
3
VCE  
VCE  
6
7
6
3
7
V
VCOMP  
VREF  
5
5
Figure 5. ICEO Test Circuit  
Figure 6. CTR, VCE(sat) Test Circuit  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
6
Test Circuits (Continued)  
VCC = +5V DC  
IF = 10 mA  
47Ω  
1
2
3
4
8
7
6
5
RL  
1µf  
VOUT  
VIN  
0.47V  
0.1 VPP  
Figure 7. Frequency Response Test Circuit  
VCC = +5V DC  
IF = 0 mA (A)  
IF = 10 mA (B)  
R1  
2.2kΩ  
1
8
7
6
5
VOUT  
2
3
4
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
Typical Performance Curves  
Fig. 9a LED Current vs. Cathode Voltage  
Fig. 9b LED Current vs. Cathode Voltage  
T = 25°C  
A
1.0  
0.5  
15  
T
V
= 25°C  
A
= V  
V
= V  
COMP FB  
COMP  
FB  
10  
5
0
0.0  
-5  
-0.5  
-1.0  
-10  
-15  
-1  
0
1
2
3
-1  
0
1
2
3
V
– CATHODE VOLTAGE (V)  
V
– CATHODE VOLTAGE (V)  
COMP  
COMP  
Fig. 10 Reference Voltage vs. Ambient Temperature  
= 10mA  
Fig. 11 Reference Current vs Ambient Temperature  
= 10mA  
2.510  
2.508  
2.506  
2.504  
2.502  
2.500  
2.498  
2.496  
2.494  
2.492  
2.490  
I
LED  
R1 = 10kΩ  
I
LED  
3
2
-40  
-20  
0
20  
40  
60  
80  
100  
-40  
-20  
0
20  
40  
60  
80  
100  
T
– AMBIENT TEMPERATURE(°C)  
T
– AMBIENT TEMPERATURE (°C)  
A
A
Fig. 12 Off-State Current vs. Ambient Temperature  
= 37V  
Fig. 13 Forward Current vs. Forward Voltage  
20  
V
LED  
100  
15  
10  
5
25°C  
0°C  
10  
70°C  
1
-40  
0.9  
1.0  
1.1  
1.2  
1.3  
1.4  
-20  
0
20  
40  
60  
80  
100  
V
– FORWARD VOLTAGE (V)  
F
T
– AMBIENT TEMPERATURE (°C)  
A
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
8
Typical Performance Curves (Continued)  
Fig. 15 Collector Current vs. Ambient Temperature  
= 5V  
Fig. 14 Dark Current vs. Ambient Temperature  
30  
25  
20  
15  
10  
5
V
= 10V  
CE  
V
CE  
1000  
100  
I
= 20mA  
LED  
I
= 10mA  
= 5mA  
LED  
10  
1
I
LED  
I
= 1mA  
LED  
0
0.1  
-40  
-20  
0
20  
40  
60  
80  
100  
0
10  
20  
30  
40  
50  
60  
70  
80  
90  
100  
T
A
– AMBIENT TEMPERATURE (°C)  
T
A
– AMBIENT TEMPERATURE (°C)  
Fig. 16 Current Transfer Ratio vs. LED Current  
= 5V  
Fig. 17 Saturation Voltage vs. Ambient Temperature  
0.26  
0.24  
0.22  
0.20  
0.18  
0.16  
0.14  
0.12  
0.10  
160  
140  
120  
100  
80  
I
I
= 10mA  
V
LED  
= 2.5mA  
CE  
C
0°C  
25°C  
70°C  
60  
40  
-40  
-20  
0
20  
40  
60  
80  
100  
1
10  
– FORWARD CURRENT (mA)  
100  
I
T
– AMBIENT TEMPERATURE (°C)  
LED  
A
Fig. 19 Rate of Change Vref to Vout vs. Temperature  
Fig. 18 Collector Current vs. Collector Voltage  
= 25°C  
35  
30  
25  
20  
15  
10  
5
-0.22  
T
A
-0.24  
-0.26  
-0.28  
-0.30  
-0.32  
-0.34  
-0.36  
I
= 20mA  
LED  
I
= 10mA  
= 5mA  
LED  
-0.38  
-0.40  
I
LED  
-0.42  
-0.44  
I
= 1mA  
LED  
7
0
-40  
-20  
0
20  
40  
60  
80  
100  
0
1
2
3
4
5
6
8
9
10  
V
– COLLECTOR-EMITTER VOLTAGE (V)  
CE  
TEMPERATURE (°C)  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
9
Typical Performance Curves (Continued)  
Fig. 20 Voltage Gain vs. Frequency  
5
V
= 10V  
CC  
= 10mA  
I
F
0
RL = 100Ω  
-5  
RL = 500Ω  
RL = 1kΩ  
-10  
-15  
1
10  
100  
1000  
FREQUENCY (kHz)  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
10  
The FOD2742  
Compensation  
The FOD2742 is an optically isolated error amplifier. It  
incorporates three of the most common elements neces-  
sary to make an isolated power supply, a reference volt-  
age, an error amplifier, and an optocoupler. It is  
functionally equivalent to the popular KA431 shunt volt-  
age 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 volt-  
age 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 regula-  
tion, 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  
The LED pin needs to be fed through a current limiting  
resistor. The value of the resistor sets the amount of cur-  
rent through the LED, and thus must be carefully  
selected in conjunction with the selection of the primary  
side resistor.  
compromise the isolation structure.  
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.  
RTOP  
------------------------- = -------------- 1  
RBOTTOM VREF  
VOUT  
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 R  
should be:  
TOP  
(12V-4V) /10K= 800µA.  
V
OUT 2.5  
---------------------------- > 1040µA  
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:  
RTOP  
10V 5V  
----------------------------------- < 800 µA or RCOLLECTOR > 6.25K;  
RCOLLECTOR  
select 12Kto allow some margin.  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
11  
Ordering Information  
Option  
V
Order Entry Identifier  
Description  
V
VDE 0884  
R2  
R2  
Tape and reel (2500 units per reel)  
R2V  
R2V  
VDE 0884, Tape and reel (2500 units per reel)  
Marking Information  
1
2
2742A  
6
V
X YY S  
5
3
4
Definitions  
1
2
3
Fairchild logo  
Device number  
VDE mark (Note: Only appears on parts ordered with VDE  
option – See order entry table)  
4
5
6
One digit year code, e.g., ‘3’  
Two digit work week ranging from ‘01’ to ‘53’  
Assembly package code  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
12  
Carrier Tape Specifications  
8.0 ± 0.10  
2.0 ± 0.05  
3.50 ± 0.20  
Ø1.5 MIN  
1.75 ± 0.10  
0.30 MAX  
4.0 ± 0.10  
5.5 ± 0.05  
12.0 ± 0.3  
8.3 ± 0.10  
5.20 ± 0.20  
Ø1.5 ± 0.1  
0.1 MAX  
6.40 ± 0.20  
User Direction of Feed  
Dimensions in mm  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
13  
Reflow Profile  
Max. Ramp-up Rate = 3°C/S  
Max. Ramp-down Rate = 6°C/S  
T
P
260  
240  
220  
200  
180  
160  
140  
120  
100  
80  
t
P
T
L
Tsmax  
t
L
Preheat Area  
Tsmin  
t
s
60  
40  
20  
0
120  
Time 25°C to Peak  
240  
360  
Time (seconds)  
Profile Freature  
Pb-Free Assembly Profile  
150°C  
Temperature Min. (Tsmin)  
Temperature Max. (Tsmax)  
200°C  
Time (t ) from (Tsmin to Tsmax)  
60–120 seconds  
3°C/second max.  
217°C  
S
Ramp-up Rate (t to t )  
L
P
Liquidous Temperature (T )  
L
Time (t ) Maintained Above (T )  
60–150 seconds  
260°C +0°C / –5°C  
30 seconds  
L
L
Peak Body Package Temperature  
Time (t ) within 5°C of 260°C  
P
Ramp-down Rate (T to T )  
6°C/second max.  
8 minutes max.  
P
L
Time 25°C to Peak Temperature  
©2003 Fairchild Semiconductor Corporation  
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1  
www.fairchildsemi.com  
14  
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coverage may be accessed at www.onsemi.com/site/pdf/PatentMarking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.  
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