TAOS TIL300A, TIL300 Datasheet

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TIL300, TIL300A

PRECISION LINEAR OPTOCOUPLER



TAOS018 – AUGUST 1999

 ac or dc Signal Coupling
 Wide Bandwidth ...>200 kHz
 High Transfer-Gain Stability...±0.005%/°C
 3500 V Peak Isolation
 Typical Applications

– Power-Supply Feedback
– Medical-Sensor Isolation

DCS OR P PACKAGE

(TOP VIEW)

LEDK
LEDA
PDK1
PDA1

NC – No internal connection

1
2
3
4

8
7
6
5

NC
NC
PDK2
PDA2

– Opto Direct-Access Arrangement (DAA)
– Isolated Process-Control Transducers

Description

The TIL300 precision linear optocoupler consists of an infrared LED irradiating an isolated feedback photodiode
and an output photodiode in a bifurcated arrangement. The feedback photodiode captures a percentage of the
flux of the LED that can be used to generate a control signal to regulate the LED drive current. This technique
is used to compensate for the nonlinear time and temperature characteristics of the LED. The output-side
photodiode then produces an output signal that is linearly proportional to the servo-optical flux emitted from the
LED.

A typical application circuit (shown in Figure 1) uses an operational amplifier as the input to drive the LED. The
feedback photodiode sources current through R1, which is connected to the inverting input of the input
operational amplifier. The photocurrent I
magnitude of the current is directly proportional to the LED current through the feedback transfer gain
K1(VI/R1 = K1 × IF). The operational amplifier supplies LED current to produce sufficient photocurrent to keep
the node voltage V

equal to node voltage V

b

assumes a magnitude that satisfies the relationship IP1 = V

P1

a.

/R1. The

I

TIL300

1

1V

CC+

V

a

+

V

b

1V

_

CC–

+

V

I

–

R1

P

NOTES: A. K1 is servo current gain, the ratio of the feedback servo photodiode current (IP1) to the input LED current (IF), i.e. K1 = IP1/I

B. K2 is forward gain, the ratio of the output photodiode current (IP2) to the input LED current (IF), i.e. K2 = IP2/IF.
C. K3 is transfer gain, the ratio of the forward gain to the servo gain, i.e. K3 = K2/K1.

R3

I

P1

I

1V

P

2

F

3

CC+

4

K1

K2

R2

2V

2V

CC+

–
+

CC–

VO = K3(R2/R1) V

I

6

2V

CC+

5

I

P2

Figure 1. Typical Application Circuit

The output photodiode is connected to a noninverting voltage follower; R2 is used to develop a voltage from
the photodiode current. The output of the amplifier is VO = K2IFR2. Overall transfer gain VO/VI becomes
VO/VI = (K2IFR2/K1IFR1). Factoring out the LED forward current IF and remembering that K2/K1 = K3, the
overall transfer gain becomes VO/VI = K3R2/R1. The overall transfer gain, therefore, is shown to be
independent of the LED current.

F.

www.taosinc.com

Texas Advanced Optoelectronic Solutions Inc.

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800 Jupiter Road, Suite 205  Plano, TX 75074  [phone]

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Copyright  2000, TAOS Inc.

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TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER

TAOS018 – AUGUST 1999

Terminal Functions

TERMINAL

NAME NO.

LEDK 1 LED cathode
LEDA 2 LED anode
PDK1 3 Photodiode 1 cathode
PDA1 4 Photodiode 1 anode
PDA2 5 Photodiode 2 anode
PDK2 6 Photodiode 2 cathode
NC 7 No internal connection
NC 8 No internal connection

DESCRIPTION

Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)

Emitter

Continuous total power dissipation (see Note 1) 160 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input LED forward current, IF 60 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Surge current with pulse duration < 10 µs 250 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reverse voltage, VR 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reverse current, IR 10 µA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Detector

Continuous total power dissipation (see Note 2) 50 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reverse voltage, VR 50 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Coupler

Continuous total power dissipation (see Note 3) 210 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

–55°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

Operating free-air temperature range, TA –55°C to 100°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input-to-output voltage 3535 Vpeak. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may
affect device reliability.

NOTES: 1. Derate linearly from 25°C at a rate of 2.66 mW/°C.

2. Derate linearly from 25°C at a rate of 0.66 mW/°C.

3. Derate linearly from 25°C at a rate of 3.33 mW/°C.

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TIL300, TIL300A

PRECISION LINEAR OPTOCOUPLER

TAOS018 – AUGUST 1999

Electrical Characteristics at T

= 25°C (unless otherwise noted)

A

Emitter

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

F

I

R

t

r

t

f

C

j

LED forward voltage I
Temperature coefficient of V

F

Reverse current V
Rise time I
Fall time I
Junction capacitance V

= 10 mA 1.25 1.50 V

F

–2.2 mV/°C

= 5 V 10 µA

R

= 10 mA, ∆IF = 2 mA 1 µs

F

= 10 mA, ∆IF = 2 mA 1 µs

F

= 0, f = 1 MHz 15 pF

F

Detector

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

†

I

DK

I

OS

C

j

Dark current V
Open-circuit voltage I
Short-circuit current limit I
Junction capacitance V

= -15 V, IF = 0 25 nA

R

= 10 mA 0.5 V

F

= 10 mA 80 µA

F

= 0, f = 1 MHz 12 pF

F

Coupler , detector bias voltage, VR = –15 V

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

†

Servo-current gain

K1

‡

Forward current gain

K2

TIL300

§

K3

Transfer gain

TIL300A

Gain temperature coefficient

¶

Transfer gain linearity

∆K3

K1/K2
K3

BW Bandwidth

t

Rise time

r

t

Fall time

f

#

V

Peak isolation voltage

iso

†

Servo-current gain (K1) is the ratio of the feedback photodiode current (IP1) to the input LED current (IF) current (IF), i.e. K1 = IP1/IF.

‡

Forward gain (K2 is the ratio of the output photodiode current (IP2) to the input LED current (IF), i.e. K2 = IP2/IF.

§

Transfer gain (K3) is the ratio of the forward gain to the servo-current gain, i.e. K3 = K2/K1.

¶

Transfer gain linearity (∆K3) is the percent deviation of the transfer gain K3 as a function of LED input current (IF) or the package temperature.

#

This symbol is not currently listed within EIA or JEDEC standards for semiconductor symbology.

IF = 1 mA 0.3% 0.7% 1.5%
IF = 10 mA 0.5% 1.25% 2%
IF = 1 mA 0.3% 0.7% 1.5%
IF = 10 mA 0.5% 1.25% 2%
IF = 1 mA 0.75 1 1.25
IF = 10 mA 0.75 1 1.25
IF = 1 mA 0.9 1 1.10
IF = 10 mA 0.9 1 1.10

IF = 10 mA
I

= 1 to 10 mA ±0.25%

F

I

= 1 to 10 mA, T

F

I

= 10 mA,

F

I

F(MODULATION)

I

= 10 mA,

F

I

F(MODULATION)

I

= 10 mA,

F

I

F(MODULATION)

I

= 10 µA, f = 60 Hz,

IO

= ±2 mA

= ±2 mA

= ±2 mA

time = 1 minute

= 0 to 75°C ±0.5%

A

R

= 1 kΩ,

L

R

= 1 kΩ,

L

R

= 1 kΩ,

L

3535 V

–0.5

±0.005

200 kHz

1.75 µs

1.75 µs

%/°C

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