FOD2741BSD_技术文档

Is Now Part of

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August 2008

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 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%.

single package

■ 2.5V reference

■ CTR 100% to 200%

■ 5,000V RMS isolation

■ UL approved E90700, Volume 2

CSA approval 1296837

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 iso-

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

VDE approval 40002463

BSI approval 8702, 8703

■ Low temperature coefficient 50ppm/°C max.

■ FOD2741A: tolerance 0.5%

FOD2741B: tolerance 1%

FOD2741C: tolerance 2%

When using the FOD2741, 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 a 8-pin dip white package.

Applications

■ Power supplies regulation

■ DC to DC converters

Functional Bock Diagram

Package Outlines

NC

LED

1

8

1

C

E

FB

2

3

4

7

6

5

COMP

GND

8

NC

1

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

Pin Definitions

Pin Number

Pin Name

Pin 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

V_O

FOD2741

2

3

8

6

7

R1

R2

5

FOD2741A, FOD2741B, FOD2741C 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

°C

STG

T

Operating Temperature

Lead Solder Temperature

Input Voltage

-40 to +85

OPR

T

260 for 10 sec.

°C

SOL

V

37

20

30

7

V

LED

I

Input DC Current

mA

V

Collector-Emitter Voltage

Emitter-Collector Voltage

Collector Current

CEO

V

ECO

I

50

145

85

145

mA

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.

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

3

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

A

Input Characteristics

Symbol

Parameter

Test Conditions

Device Min. Typ. Max. Unit

V

LED Forward Voltage

Reference Voltage

I

= 10mA, V

= V (Fig.1)

All

1.5

V

F

LED

COMP

FB

V

= V

FOD2741A 2.482 2.495 2.508

FOD2741B 2.470 2.495 2.520

FOD2741C 2.450 2.500 2.550

REF

LED

FB

V

(4)

V

Deviation of V

Temperature

Over T = -25°C to +85°C

All

4.5

17

mV

REF (DEV)

REF

A

∆V

/

Ratio of V

to the Output of the

Error Ampliﬁer

Variation

I

= 10mA ∆V

∆V

= 10V to V

REF

All

-1.0

-0.5

-2.7 mV/V

-2.0

REF

LED

COMP

= 36V to 10V

I

Feedback Input

Current

= 10mA, R = 10kΩ (Fig. 3)

All

1.5

0.4

4

µA

REF

1

(4)

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

0.05

1.0

mA

µA

LED (MIN)

COMP

FB

I

Off-state Error

V

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

LED FB

(OFF)

Ampliﬁer Current

|Z

|

Error Ampliﬁer Output

impedance

V

= V , I

= 1mA to 20mA,

All

0.15

0.5

Ω

OUT

COMP

REF LED

(5)

f ≥ 1.0 kHz

Output Characteristics

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

I

Collector Dark Current

V

= 10V (Fig. 5)

50

nA

V

CEO

CE

BV

Emitter-Collector Voltage Breakdown

Collector-Emitter Voltage Breakdown

I = 100µA

7

ECO

CEO

E

I

= 1.0mA

70

V

C

Transfer Characteristics

Parameter

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

CTR

Current Transfer Ratio

I

= 10mA, V

= V ,

FB

100

200

%

LED

COMP

V

= 5V (Fig. 6)

CE

V

Collector-Emitter Saturation

Voltage

I

= 10mA, V

= 2.5mA (Fig. 6)

= V

0.4

V

CE (SAT)

LED

COMP

FB,

C

Notes:

4. 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

5. 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

FOD2741A, FOD2741B, FOD2741C 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

(6)

V

= 3000 VDC

I-O

(6)

V

Withstand Insulation

Voltage

RH ≤ 50%, T = 25°C, t = 1 min.

5000

Vrms

ISO

A

(6)

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

(7)

R = 2.2kΩ (Fig. 8)

L

CML

Common Mode Transient

Immunity at Output LOW

(I

= 1mA, Vcm = 10 V

1.0

kV/µs

LED

PP,

(7)

R = 2.2kΩ (Fig. 8)

L

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.

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

5

Test Circuits

I_(LED)

8

2

3

8

2

3

V_F

6

7

R1

6

7

V

V_COMP

V_REF

R2

V_REF

5

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

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

I_(LED)

I_(OFF)

8

2

3

8

2

I_REF

6

7

6

3

V_(LED)

7

V

R1

5

Figure 4. I_(OFF)Test Circuit

I_(LED)

Figure 3. I_REFTest Circuit

I_CEO

I_C

8

2

V_CE

6

7

6

7

3

V

V_COMP

V_REF

5

Figure 5. I_CEOTest Circuit

Figure 6. CTR, V_CE(sat)Test Circuit

FOD2741A, FOD2741B, FOD2741C 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

FOD2741A, FOD2741B, FOD2741C 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 vs. Ambient Temperature

= 10mA

Fig. 11 – Reference Current vs Ambient Temperature

2.510

2.508

2.506

2.504

2.502

2.500

2.498

2.496

2.494

2.492

2.490

1.30

1.25

1.20

1.15

1.10

1.05

I

= 10mA

LED

R1 = 10kΩ

I

LED

-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

V

CC

10

25°C

0°C

70°C

1

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

– AMBIENT TEMPERATURE (°C)

F

A

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

8

Typical Performance Curves (Continued)

Fig. 14 – Dark Current vs. Ambient Temperature

Fig. 15 – Collector Current vs. Ambient Temperature

10000

30

25

20

15

10

5

V

= 10V

CE

V

CE

= 5V

1000

100

10

I

= 20mA

LED

= 10mA

= 6mA

I

LED

1

= 1mA

50

0.1

0

-40

-20

0

20

40

60

80

100

0

10

20

30

40

60

70

80

90

100

T

A

– AMBIENT TEMPERATURE (°C)

T

– AMBIENT TEMPERATURE (°C)

A

Fig. 16 – Current Transfer Ratio vs. LED Current

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

V

= 5V

CE

140

120

100

80

0°C

25°C

70°C

60

40

-40

-20

0

20

40

60

80

100

0

5

10

15

20

25

30

35

40

45

50

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

35

30

25

20

15

10

5

T

A

= 25°C

-0.34

-0.36

-0.38

-0.40

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

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

9

Typical Performance Curves (Continued)

Fig. 20 – Voltage Gain vs. Frequency

VCC=10V

IF=10mA

0

-5

RL = 100Ω

RL = 500Ω

RL = 1kΩ

-10

-15

0.1

1

10

100

1000

FREQUENCY (kHz)

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

10

The FOD2741

The FOD2741 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 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 typ-

ical 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 pro-

cess may be found in “Practical Design of Power Sup-

plies” 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 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 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 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.

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 FOD2741 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 KA1H0680, which has a 5V ref-

erence. If we select a 10kΩ resistor for the LED, the

maximum 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

(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:

resistance of R

should be:

TOP

V

_OUT– 2.5

---------------------------- > 1040µA

R_TOP

10V – 5V

----------------------------------- < 800 µA or R_COLLECTOR> 6.25kΩ;

R_COLLECTOR

select 12kΩ to allow some margin.

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

11

Ordering Information

Option

Example Part Number

FOD2741A

Description

No Option

Standard Through Hole

S

SD

T

FOD2741AS

Surface Mount Lead Bend

Surface Mount; Tape and Reel

0.4" Lead Spacing

FOD2741ASD

FOD2741AT

V

FOD2741AV

VDE0884

TV

SV

SDV

FOD2741ATV

FOD2741ASV

FOD2741ASDV

VDE0884; 0.4” Lead Spacing

VDE0884; Surface Mount

VDE0884; Surface Mount; Tape and Reel

Marking Information

1

2

2741A

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

FOD2741A, FOD2741B, FOD2741C 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

Reflow Profile

245C, 10–30 s

300

250

200

150

100

50

260C peak

Time above 183C, <160 sec

Ramp up = 2–10C/sec

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Time (Minute)

• Peak reflow temperature: 260C (package surface temperature)

• Time of temperature higher than 183C for 160 seconds or less

• One time soldering reflow is recommended

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

www.fairchildsemi.com

13

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

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

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1


型号：	FOD2741BSD
厂家：	ONSEMI
描述：	8引脚DIP误差放大器光电耦合器放大器输出元件光电
文件：	总18页 (文件大小：502K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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