FOD2743BSDV_技术文档

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August 2008

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 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%.

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

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 iso-

lated AC to DC power supplies and dc/dc converters.

■ Low temperature coefficient 50ppm/°C max

■ FOD2743A: tolerance 0.5%

FOD2743B: tolerance 1%

FOD2743C: tolerance 2%

When using the FOD2743, 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 an 8-pin dip white package.

Applications

■ Power supplies regulation

■ DC to DC converters

Functional Bock Diagram

Package Outlines

1

8

LED

COMP

GND

FB

NC

8

1

2

3

4

7

6

5

C

E

8

NC

1

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

Pin Definitions

Pin Number

Pin Name

Pin Description

Anode LED. This pin is the input to the light emitting diode.

1

2

3

4

5

6

7

8

LED

COMP

GND

FB

Error Ampliﬁer Compensation. This pin is the output of the error ampliﬁer. *

Ground

Voltage Feedback. This pin is the inverting input to the error ampliﬁer

Not connected

NC

Phototransistor Emitter

Phototransistor Collector

Not connected

E

C

NC

*The compensation network must be attached between pins 2 and 4.

Typical Application

FAN4803

PWM

Control

V₁

V_O

FOD2743

7

6

1

2

4

3

R1

R2

FOD2743A, FOD2743B, FOD2743C 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

Storage Temperature

T

-40 to +125

°C

STG

Operating Temperature

Lead Solder Temperature

Input Voltage

T

-40 to +85

OPR

T

260 for 10 sec.

°C

SOL

V

37

20

70

7

V

LED

Input DC Current

I

mA

V

Collector-Emitter Voltage

Emitter-Collector Voltage

Collector Current

V

CEO

V

ECO

I

50

145

85

145

mA

mW

C

Input Power Dissipation

Transistor Power Dissipation

PD1

PD2

PD3

(1)

Total Power Dissipation

Note:

1. See derating graph, Figure 21.

FOD2743A, FOD2743B, FOD2743C 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

= 1mA, V

= V (Fig.1)

All

1.07

1.2

V

F

LED

COMP

FB

V

= V

FOD2743A 2.482 2.495 2.508

FOD2743B 2.470 2.495 2.520

FOD2743C 2.450 2.500 2.550

REF

LED

FB

V

(2)

V

Deviation of V

Temperature

Over T = -25°C to +85°C

All

4.5

17

mV

REF (DEV)

REF

(2)

A

∆V

/

Ratio of V

to the Output of the

Error Ampliﬁer

Variation

I

= 1mA ∆V

∆V

= 10V to V

REF

All

-0.4

-0.3

-2.7

-2.0

mV/V

REF

LED

COMP

= 36V to 10V

I

Feedback Input Current I

= 1mA, R = 10kΩ (Fig. 3)

All

2

1

4

µA

REF

LED

1

(2)

I

Deviation of I

Temperature

Over T = -25°C to +85°C

1.2

REF (DEV)

REF

A

I

Minimum Drive Current

V

= V (Fig.1)

All

0.45

1.0

mA

µA

LED (MIN)

COMP

FB

I

Off-State Error

= 37V, V = 0 (Fig. 4)

0.001

(OFF)

LED

FB

Ampliﬁer Current

|Z

|

Error Ampliﬁer Output

Impedance

V

= V , I = 1mA to 20mA,

REF LED

All

0.15

0.5

Ω

OUT

COMP

(3)

f ≥ 1.0 kHz

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

Collector-Emitter Voltage Breakdown

I = 100µA

7

10

ECO

CEO

E

I = 1.0mA

70

100

V

C

Transfer Characteristics

Parameter

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

CTR

Current Transfer Ratio

I

= 1mA, V

= V ,

FB

50

100

%

LED

COMP

V

= 5V (Fig. 6)

CE

V

Collector-Emitter Saturation

Voltage

I

= 1mA, V

= V

0.4

V

CE (SAT)

LED

COMP

FB,

I = 0.1mA (Fig. 6)

C

Notes:

2. The deviation parameters V

and I

are defined as the differences between the maximum and

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

{V_REF(DEV)/V_REF(T_A= 25°C)} × 10⁶

∆V_REF(ppm/°C) = ----------------------------------------------------------------------------------------------------

∆T_A

where ∆T is the rated operating free-air temperature range of the device.

A

3. 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

Z_{OUT, TOT}= ------- ≈ Z_OUT× 1 + -------

∆I

R2

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

4

Electrical Characteristics ^{(Continued) (T = 25°C unless otherwise speciﬁed)}

A

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

(4)

V

= 3000 VDC

I-O

(4)

V

Withstand Insulation

Voltage

RH ≤ 50%, T = 25°C, t = 1 min.

5000

Vrms

ISO

A

(4)

12

R

Resistance (Input to Output)

V

= 500 VDC

10

Ω

I-O

Switching Characteristics

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

BW

Bandwidth

(Fig. 7)

= 0mA, Vcm = 10 V

50

kHZ

CMH

Common Mode Transient

Immunity at Output HIGH

I

,

PP

1.0

kV/µs

LED

(5)

R = 2.2kΩ (Fig. 8)

L

CML

Common Mode Transient

Immunity at Output LOW

(I

= 1 mA, Vcm = 10 V

1.0

kV/µs

LED

PP,

(5)

R = 2.2 kΩ (Fig. 8)

L

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.

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

5

Test Circuits

I_(LED)

1

7

6

1

7

6

V_F

2

4

R1

2

4

V

V_COMP

V_REF

R2

V_REF

3

Figure 1. V_REF, V_F,I_LED(min.) Test Circuit

Figure 2. ∆V_{REF /}∆V_COMPTest Circuit

I_(LED)

I_(OFF)

1

7

6

1

7

I_REF

2

6

V_(LED)

4

V

R1

3

Figure 3. I_REFTest Circuit

Figure 4. I_(OFF)Test Circuit

I_(LED)

I_CEO

I_C

1

7

6

V_CE

2

4

2

6

4

V_COMP

V_REF

V

3

Figure 5. I_CEOTest Circuit

Figure 6. CTR, V_CE(sat)Test Circuit

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

6

Test Circuits (Continued)

V_CC= +5V DC

I_F= 1mA

47Ω

8

7

6

5

1

4

2

3

R_L

1µF

V_OUT

V_IN

0.47V

0.1 V_PP

Figure 7. Frequency Response Test Circuit.

V_CC= +5V DC

I_F= 0mA (A)

I_F= 1mA (B)

R1

2.2kΩ

8

7

6

5

1

4

V_OUT

A B

2

3

VCM

_

+

10V_P-P

Figure 8. CMH and CML Test Circuit

FOD2743A, FOD2743B, FOD2743C 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

-10

-15

-1.0

–1

0

1

2

3

-1

0

1

2

3

V

– CATHODE VOLTAGE (V)

V

– CATHODE VOLTAGE (V)

COMP

Fig. 10 – Reference Voltage Variation vs. Ambient Temperature

Fig. 11 – Reference Current vs Ambient Temperature

1.0

4.0

3.5

3.0

2.5

2.0

1.5

1.0

I

= 1mA, 10mA

LED

I

= 1mA, 10mA

LED

0.8

0.6

R1 = 10kΩ

Normalized to T = 25°C

A

0.4

0.2

0.0

-0.2

-0.4

-0.6

-0.8

-1.0

-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

Fig. 12 – Off–State Current vs. Ambient Temperature

= 37V

Fig. 13 – Forward Current vs. Forward Voltage

20

15

10

5

100

10

1

V

CC

25°C

0°C

70°C

0.9

1.0

1.1

1.2

1.3

1.4

-40

-20

0

20

40

60

80

100

V

– FORWARD VOLTAGE (V)

T

A

– AMBIENT TEMPERATURE (°C)

F

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

8

Typical Performance Curves (Continued)

Fig. 15 – Collector Current vs. Ambient Temperature

Fig. 14 – Dark Current vs. Ambient Temperature

32

28

24

20

16

12

8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

10000

V

= 10V

V

= 5V

CE

1000

100

10

I

= 20mA

LED

I

= 1mA

LED

I

= 10mA

= 5mA

LED

1

4

0.1

0

-40

-20

0

20

40

60

80

100

-20

0

20

40

60

80

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

0.08

0.06

160

140

120

100

80

V

CE

25°C

0°C

I

= 10mA

LED

= 2.5mA

C

I

= 1mA

-40°C

LED

= 0.1mA

60

C

70°C

40

20

0

100°C

-40

-20

0

20

40

60

80

100

0.1

1

10

I

– FORWARD CURRENT (mA)

T

– AMBIENT TEMPERATURE (°C)

LED

A

Fig. 19 – Rate of Change Vref to Vout vs. Temperature

Fig. 18 – Collector Current vs. Collector Voltage

-0.32

-0.34

-0.36

-0.38

-0.40

35

30

25

20

15

10

5

T

A

= 25°C

I

= 20mA

= 10mA

LED

I

LED

-0.42

-0.44

-0.46

I

= 5mA

LED

I

= 1mA

8

LED

7

0

-60

-40

-20

0

20

40

60

80

100

120

0

1

2

3

4

5

6

9

10

TEMPERATURE (°C)

V

– COLLECTOR-EMITTER VOLTAGE (V)

CE

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

9

Typical Performance Curves (Continued)

Fig. 20 – Voltage Gain vs. Frequency

5

V

= 10V

CC

0

I

= 10mA

F

R

= 500 Ω

L

I

R

= 1mA

F

-5

= 2.4kΩ

L

I

= 10mA

F

R

= 100Ω

L

I

= 10mA

F

R

= 1kΩ

L

-10

-15

1

10

100

FREQUENCY (kHz)

1000

Fig. 21 – Package Power Dissipation

vs Ambient Temperature

200

150

100

50

0

-40

-20

0

20

40

60

80

100

Ta – AMBIENT TEMPERATURE (°C)

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

10

The FOD2743

The FOD2743 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.

Compensation

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 refer-

ence 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 volt-

age 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 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 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 cur-

rent 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 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.

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.

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 ref-

erence 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 refer-

ence. If we select a 10kΩ resistor for the LED, the maxi-

mum current the LED can see is:

R_TOP

------------------------- = -------------- – 1

R_BOTTOMV_REF

V_OUT

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

(12V – 4V) / 10kΩ = 800µA.

should be:

TOP

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

----------------------------------- < 400 µA or R_COLLECTOR> 12.5kΩ;

R_COLLECTOR

select 20kΩ to allow some margin.

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

11

Ordering Information

Option

Example Part Number

FOD2743A

Description

No Option

Standard Through Hole

S

SD

T

FOD2743AS

Surface Mount Lead Bend

Surface Mount; Tape and Reel

0.4" Lead Spacing

FOD2743ASD

FOD2743AT

V

FOD2743AV

VDE0884

TV

SV

SDV

FOD2743ATV

FOD2743ASV

FOD2743ASDV

VDE0884; 0.4” Lead Spacing

VDE0884; Surface Mount

VDE0884; Surface Mount; Tape and Reel

Marking Information

1

2

2743A

6

V XX YY B

5

3

4

Deﬁnitions

Fairchild logo

1

Device number

2

3

VDE mark (Note: Only appears on parts ordered with VDE

option – See order entry table)

Two digit year code, e.g., ‘03’

4

5

6

Two digit work week ranging from ‘01’ to ‘53’

Assembly package code

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

12

Carrier Tape Specifications

D₀

P₀

P₂

t

E

K₀

F

A₀

W

W₁

B₀

P

User Direction of Feed

d

D₁

Symbol

Description

Dimension in mm

16.0 0.3

0.30 0.05

4.0 0.1

W

t

Tape Width

Tape Thickness

P

Sprocket Hole Pitch

Sprocket Hole Diameter

Sprocket Hole Location

Pocket Location

0

D

1.55 0.05

1.75 0.10

7.5 0.1

0

E

F

P

4.0 0.1

2

P

Pocket Pitch

12.0 0.1

10.30 0.20

4.90 0.20

1.6 0.1

A

Pocket Dimensions

0

B

K

W

Cover Tape Width

1

d

Cover Tape Thickness

0.1 max

Max. Component Rotation or Tilt

Min. Bending Radius

10°

R

30

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

13

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°

250

200

150

100

50

40 s

50

100

150

200

250

300

Time (s)

Figure 22. Recommended IR Reflow Profile

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

14

ON Semiconductor and

are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

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型号：	FOD2743BSDV
厂家：	ONSEMI
描述：	8 引脚 DIP 误差放大器光耦合器放大器输出元件光电
文件：	总19页 (文件大小：519K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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