Datasheet FOD2712A Datasheet (Fairchild)

FOD2712A — Optically Isolated Error Ampliﬁer

December 2010

FOD2712A Optically Isolated Error Amplifier

Features

■

Optocoupler, precision reference and error amplifier in single package

■

1.240V ± 1% reference

■

CTR 100% to 200% 2,500V RMS isolation

■

UL approval E90700

Applications

Power system for workstations

■

Telecom central office supply

■

Telecom bricks

Description

The FOD2712A Optically Isolated Amplifier consists of the popular AZ431L precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. The reference voltage tolerance is 1%. The current transfer ratio (CTR) ranges from 100% to 200%.

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 FOD2712A, 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 compact 8-pin small outline package.

Schematic Package Outline

1

NC

C

2

3

E

NC

4 5

8

7

6

LED

FB

COMP

GND

Pin Deﬁnitions

Pin Number Pin Name Functional Description

1NCNot connected

2CPhototransistor Collector

3EPhototransistor Emitter

4NCNot connected

5 GND Ground

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

7FBVoltage Feedback. This pin is the inverting input to the error ampliﬁer

8 LED 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

FOD2712A — Optically Isolated Error Ampliﬁer

FAN4803

V

1

PWM

Control

FOD2712A

2

3

8

6

7

5

R1

R2

V

O

FOD2712A — Optically Isolated Error Ampliﬁer

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

STG

T

OPR

V

LED

I

LED

V

CEO

V

ECO

I

C

PD1 Input Power Dissipation

PD2 Transistor Power Dissipation

PD3 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.

Storage Temperature -40 to +125 °C

Operating Temperature -40 to +85 °C

Reﬂow Temperature Proﬁle (refer to 15)

Input Voltage 13.2 V

Input DC Current 20 mA

Collector-Emitter Voltage 30 V

Emitter-Collector Voltage 7 V

Collector Current 50 mA

(1)

(2)

(3)

145 mW

85 mW

145 mW

/ ∆

∆

FOD2712A — Optically Isolated Error Ampliﬁer

Electrical Characteristics

(V

= 12V, T

CC

= 25°C unless otherwise speciﬁed)

A

Input Characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

LED Forward Voltage I

F

= 10mA, V

LED

COMP

= V

FB

(Fig.1)

V

REF

V

REF (DEV)

Reference Voltage

-40°C to +85°C 25°C

Deviation of V

REF

over temperature

V

= V

, I

COMP

(Fig.1)

FB

LED

= 10mA

1.221 1.259 V

1.228 1.240 1.252

T

= -40 to +85°C 4 12 mV

A

See Note 1

V

COMP

I

REF

Ratio of Vref Variation to the Output of the Error Ampliﬁer

Feedback Input Current I

I

= 10 mA,

LED

V

= V

COMP

REF

(Fig. 2)

= 10mA, R1 = 10k Ω

LED

-1.5 -2.7 mV/V

to 12V

0.15 0.5 µA

(Fig. 3)

I

REF (DEV)

Deviation of I

Over Temperature

REF

T

= -40 to +85°C 0.15 0.3 µA

A

See Note 1

I

LED (MIN)

I

(OFF)

|Z

OUT

Minimum Drive Current V

Off-state Error Ampliﬁer Current V

| Error Ampliﬁer Output Impedance

See Note 2

= V

COMP

= 6V, V

LED

V

COMP

I

= 0.1mA to 15mA,

LED

(Fig.1) 55 80 µA

FB

= V

,

FB

= 0 (Fig.4) 0.001 0.1 µA

0.25

f < 1kHZ

Notes:

1. The deviation parameters V

REF(DEV)

and I

REF(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, ∆V

∆V

REF

where ∆ T

ppm/°C()

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

A

V

-----------------------------------------------------------------------------------------------------=

2. The dynamic impedance is defined as |Z

, is defined as:

REF

REF DEV()/VREFTA

∆T

A

OUT

25°C=(){}106×

| = ∆ V

COMP

I

. When the device is operating with two external

LED

resistors (see Figure 2), the total dynamic impedance of the circuit is given by:

1.5 V

Ω

Z

OUT, TOT

∆V

=

--------Z

∆I

OUT

R1

1

--------+×≈ R2

FOD2712A — Optically Isolated Error Ampliﬁer

Electrical Characteristics

(V

= 12V, T

CC

= 25°C unless otherwise speciﬁed) (Continued)

A

Output Characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

BV

I

CEO

ECO

Collector Dark Current V

Collector-Emitter Voltage Breakdown

Emitter-Collector Voltage Breakdown

= 10V (Fig. 5) 50 nA

CE

I

= 1.0mA 70 V

C

I

= 100µA 7 V

E

Transfer Characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

CTR Current Transfer Ratio I

V

CE

Collector-Emitter

(SAT)

Saturation Voltage

= 10mA, V

LED

V

= 5V (Fig. 6)

CE

I

= 10mA, V

LED

I

= 2.5mA (Fig. 6)

C

COMP

= V

FB

,

100 200 %

0.4 V

Isolation Characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

I-O

V

ISO

R

I-O

Input-Output Insulation Leakage Current

RH = 45%, T V

= 3000 VDC (Note 1)

I-O

Withstand Insulation Voltage RH ≤ 50%, T

t = 1 min. (Note 1)

Resistance (Input to Output) V

= 500 VDC (Note 1) 10

I-O

= 25°C, t = 5s,

A

= 25°C,

A

1.0 µA

2500 Vrms

12

Ω

Switching Characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

B

W

CMH Common Mode Transient

CML Common Mode Transient

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.

Bandwidth Fig. 7 10 kHz

= 0mA, Vcm = 10 V

Immunity at Output HIGH

Immunity at Output LOW

I

LED

RL = 2.2kΩ (Fig. 8) (Note 2)

= 10mA, Vcm = 10 V

I

LED

RL = 2.2kΩ (Fig. 8) (Note 2)

PP

1.0 kV/µs

Test Circuits

I

(LED)

V

82

V

F

6

3

7

V

REF

5

FOD2712A — Optically Isolated Error Ampliﬁer

I

(LED)

8

6R1

V

R2

7

V

COMP

V

REF

5

2

3

Figure 1. V

V

Figure 3. I

REF

, VF, I

I

REF

(min) Test Circuit

LED

(LED)

8

6

7

2

3

Figure 2. ∆V

I

(OFF)

V

REF/∆VCOMP

V

(LED)

Test Circuit

8

6

7

2

3

R1

5

I

(LED)

Figure 4. I

V

REF

Test Circuit

REF

I

8

6

7

CEO

2

V

CE

3

V

5

(OFF)

8

6

7

5

Test Circuit

V

COMP

I

(C)

2

V

CE

3

Figure 5. I

Test Circuit Figure 6. CTR, V

CEO

CE(sat)

Test Circuit

Test Circuits (Continued)

VCC = +5V DC

FOD2712A — Optically Isolated Error Ampliﬁer

IF = 10 mA

R

L

1

8

47Ω

1µf

V

OUT

2

3

4

7

0.1 V

PP

6

5

V

IN

0.47V

Figure 7. Frequency Response Test Circuit

V

= +5V DC

CC

IF = 0 mA (A)

= 10 mA (B)

I

F

R1

2.2kΩ

1

8

V

OUT

2

3

4

VCM

_

10V

+

P-P

7

6

5

A

B

Figure 8. CMH and CML Test Circuit

Typical Performance Curves

FOD2712A — Optically Isolated Error Ampliﬁer

Fig. 9a LED Current vs. Cathode Voltage

15

TA = 25°C

= V

V

COMP

10

FB

5

0

-5

– SUPPLY CURRENT (mA)

LED

-10

I

-15

-1.0 -0.5 0.0 0.5 1.0 1.5

V

– CATHODE VOLTAGE (V) V

COMP

Fig. 10 Reference Voltage vs. Ambient Temperature

1.254 I

= 10mA

LED

GE (V)

1.248

1.242

Fig. 9b LED Current vs. Cathode Voltage

150

TA = 25°C

120

90

V

COMP

= V

FB

60

30

0

-30

-60

– SUPPLY CURRENT (µA)

-90

LED

I

-120

-150

-1.0 -0.5 0.0 0.5 1.0 1.5

– CATHODE VOLTAGE (V)

COMP

Fig. 11 Reference Current vs. Ambient Temperature

350

I

= 10mA

LED

R

= 10kΩ

1

300

T (nA)

250

200

REFERENCE VOLTA

1.236

–

REF

V

1.230

-40 -20 0 20 40 60 80

TA – AMBIENT TEMPERATURE (°C) TA – AMBIENT TEMPERATURE (°C)

Fig. 12 Off Current vs. Ambient Temperature

100

V

LED

V

= 0

FB

10

– OFF CURRENT (nA)

1

(OFF)

I

0.1

-40 -20 0 20 40 60 80 100

= 13.2V

150

REFERENCE CURREN –

100

REF

I

50

-40 -20 0 20 40 60 80 100

– AMBIENT TEMPERATURE (°C)

T

A

Typical Performance Curves (Continued)

FOD2712A — Optically Isolated Error Ampliﬁer

Fig.13 LED Forward Current vs. Forward Voltage

20

15

70°C

10

25°C

0°C

FORWARD CURRENT (mA)

5

–

LED

I

0

0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35

VF – FORWARD VOLTAGE (V)

Fig. 15 Collector Current vs. Ambient Temperature

30

VCE = 5V

25

20

15

10

5

– COLLECTOR CURRENT (mA)

C

0

I

-40 -20 0 20 40 60 80 100

TA – AMBIENT TEMPERATURE (°C)

= 20mA

I

LED

= 10mA

I

LED

= 5mA

I

LED

I

= 1mA

LED

Fig.14 Dark Current vs. Temperature

VCE = 10V

1000

100

10

– DARK CURRENT (nA)

1

CEO

I

0.1

-40 -20 0 20 40 60 80 100

TA – AMBIENT TEMPERATURE (°C)

Fig. 16 Current Transfer Ratio vs. LED Current

160

V

= 5V

CE

140

120

100

80

TRANSFER RATIO (%)

60

70°C

40

20

) – CURRENT

F

0

/I

C

(I

01020304050

I

– FORWARD CURRENT (mA)

LED

0°C

25°C

Fig. 17 Saturation Voltage vs. Ambient Temperature

0.22

0.20

0.18

0.16

0.14

– SATURATION VOLTAGE (V)

0.12

CE (sat)

V

0.10

-40 -20 0 20 40 60 80 100

TA – AMBIENT TEMPERATURE (°C)

Typical Performance Curves (Continued)

FOD2712A — Optically Isolated Error Ampliﬁer

Fig. 18 Collector Current vs. Collector Voltage

45

TA = 25°C

40

35

= 20 mA

I

30

25

20

15

10

– COLLECTOR CURRENT (mA)

C

I

5

0

012345678910

VCE – COLLECTOR-EMITTER VOLTAGE (V)

LED

I

LED

I

LED

I

LED

= 10 mA

= 5 mA

= 1 mA

Fig. 20 Voltage Gain vs. Frequency

0

) dB

in

/V

o

-5

Fig. 19 Delta V

1

(mV/V)

0

COMP

/DELTA V

REF

-1

DELTA V

-2

-40 -20 0 20 40 60 80 100

100Ω

500Ω

/Delta V

REF

TA – AMBIENT TEMPERATURE (°C)

vs. Ambient Temperature

COMP

-10

VOLTAGE GAIN, A(V

-15 10 100 1000

RL=1kΩ

FREQUENCY kHz

FOD2712A — Optically Isolated Error Ampliﬁer

The FOD2712A

The FOD2712A 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 AZ431L shunt voltage regulator plus the CNY17F-3 optocoupler.

Powering the Secondary Side

The LED pin in the FOD2712A powers the secondary side, and in particular provides the current to run the LED. The actual structure of the FOD2712A 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 1.24V + 1.5V = 2.74V. 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.

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.

Feedback

Output voltage of a converter is determined by selecting a resistor divider from the regulated output to the FB pin. The FOD2712A attempts to regulate its FB pin to the reference voltage, 1.24V. The ratio of the two resistors should thus be:

R

TOP

-------------------------R

BOTTOM

The absolute value of the top resistor is set by the input offset current of 0.8µA. To achieve 1% accuracy, the resistance of R

V

OUT

-------------------------------- 8 0 µA>

R

TOP

1.24–

V

OUT

-------------- 1–= V

REF

should be:

Compensation

The compensation pin of the FOD2712A 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.

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.

Photo-Transistor

The Photo-transistor is the output of the FOD2712A. In a normal configuration the collector will be attached to a pull-up resistor and the emitter grounded. There is no base connection necessary.

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.

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:

(12V–2.74V) /10KΩ = 926µA.

The CTR of the opto-isolator is a minimum of 100%, and so the minimum collector current of the photo-transistor when the diode is full on is also 926µA. The collector resistor must thus be such that:

10V 5V–

----------------------------------- 9 2 6 µA or R R

COLLECTOR

select 10KΩ to allow some margin.

COLLECTOR

5.4KΩ;><

Package Dimensions

8-pin SOIC Surface Mount

FOD2712A — Optically Isolated Error Ampliﬁer

8

0.164 (4.16)

0.144 (3.66)

1

0.202 (5.13)

0.182 (4.63)

0.143 (3.63)

0.123 (3.13)

SEATING PLANE

0.021 (0.53)

0.011 (0.28)

0.050 (1.27) Typ.

Lead Coplanarity: 0.004 (0.10) MAX

0.008 (0.20)

0.003 (0.08)

Recommended Pad Layout

0.024 (0.61)

0.275 (6.99)

0.155 (3.94)

0.010 (0.25)

0.006 (0.16)

0.244 (6.19)

0.224 (5.69)

0.060 (1.52)

0.050 (1.27)

Dimensions in inches (mm).

Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package speciﬁcations do not expand the terms of Fairchild’s worldwide terms and conditions, speciﬁcally the warranty therein, which covers Fairchild products.

Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:

http://www

.fairchildsemi.com/packaging/

Ordering Information

Option Example Part Number Description

V FOD2712AV VDE 0884

R2 FOD2712AR2 Tape and reel (2500 units per reel)

R2V FOD2712AR2V VDE 0884, Tape and reel (2500 units per reel)

Marking Information

1

FOD2712A — Optically Isolated Error Ampliﬁer

2

6

43

2712A

SYYXV

5

Deﬁnitions

1Fairchild logo

2Device 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’

5Two digit work week ranging from ‘01’ to ‘53’

6 Assembly package code

Carrier Tape Specifications

FOD2712A — Optically Isolated Error Ampliﬁer

8.0 ± 0.10

3.50 ± 0.20

0.30 MAX

8.3 ± 0.10

0.1 MAX

Dimensions in mm

4.0 ± 0.10

User Direction of Feed

2.0 ± 0.05

6.40 ± 0.20

Ø1.5 MIN

1.75 ± 0.10

5.5 ± 0.05

12.0 ± 0.3

5.20 ± 0.20

Ø1.5 ± 0.1

Reﬂow Proﬁle

FOD2712A — Optically Isolated Error Ampliﬁer

Max. Ramp-up Rate = 3°C/S

Max. Ramp-down Rate = 6°C/S

Ts ma x

Preheat Area

Ts mi n

t

L

t

s

260 240 220 200 180 160 140 120

T

P

T

L

100

80 60

Temperature (°C)

40 20

0

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 (t

Ramp-up Rate (t

Liquidous Temperature (T

Time (t

Peak Body Package Temperature 260°C +0°C / –5°C

Time (t

Ramp-down Rate (T

Time 25°C to Peak Temperature 8 minutes max.

) from (Tsmin to Tsmax) 60–120 seconds

S

to tP) 3°C/second max.

L

) 217°C

L

) Maintained Above (TL) 60–150 seconds

L

) within 5°C of 260°C 30 seconds

P

to TL) 6°C/second max.

P

t

P

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®

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®

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F-PFS™

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SM

Programmable Active Droop™

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Saving our world,1mW/W/kWatatime™ SignalWise™ SmartMax™ SMART START™

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FOD2712A — Optically Isolated Error Ampliﬁer

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Advance Information Formative / In Design

Preliminary First Production

No Identification Needed Full Production

Obsolete Not In Production

Datasheet contains the design specifications for product development. Specifications may change in any manner without notice.

Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design.

Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve the design.

Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor. The datasheet is for reference information only.

Rev. I51