TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER
SOES019A – OCTOBER 1995 – REVISED JULY 1996
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
ac or dc Signal Coupling
D
Wide Bandwidth ...>200 kHz
D
High Transfer-Gain Stability . . . ±0.05%/°C
D
3500 V Peak Isolation
D
UL Approval Pending
D
Applications
– Power-Supply Feedback
– Medical-Sensor Isolation
– 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 and generates a control signal that can be used 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 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 IP1 assumes a magnitude that satisfies the relationship IP1 = VI/R1. The
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 suf ficient photocurrent to keep
the node voltage Vb equal to node voltage Va.
_
+
+
–
IP2
2VCC+
2VCC–
VO = K3(R2/R1) VI
2VCC+
6
5
TIL300
1
2
3
4
R3
1VCC+
IF
1VCC–
1VCC+
P
R1
+
–
VI
K2
K1
IP1
Va
Vb
P
R2
NOTES: A. K1 is servo current gain, the ratio of the feedback photodiode current (IP1) to the input LED current (IF), i.e. K1 = IP1/IF.
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.
Figure 1. Typical Application Circuit
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
8
7
6
5
LEDK
LEDA
PDK1
PDA1
NC
NC
PDK2
PDA2
P PACKAGE
(TOP VIEW)
NC – No internal connection
TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER
SOES019A – OCTOBER 1995 – REVISED JULY 1996
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O
DESCRIPTION
LEDK 1LED cathode
LEDA 2LED anode
PDK1 3Photodiode 1 cathode
PDA1 4Photodiode 1 anode
PDA2 5Photodiode 2 anode
PDK2 6Photodiode 2 cathode
NC 7No internal connection
NC 8No internal connection
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 width < 10 µs 250 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse voltage, VR 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse current, IR 10 µA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detector
Continuous power dissipation (see Note 2) 50 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse voltage, VR 50 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coupler
Continuous total power dissipation (see Note 3) 210 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature, Tstg –55°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating temperature, 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 or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect 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.
TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER
SOES019A – OCTOBER 1995 – REVISED JULY 1996
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics at TA = 25°C
Emitter
PARAMETER CONDITIONS MIN TYP†MAX UNIT
VFForward voltage IF = 10 mA 1.25 1.50 V
Temperature coefficient of VF–2.2 mV/°C
IRReverse current VR = 5 V 10 µA
trRise time IF = 10 mA, ∆IF = 2 mA 1µs
tfFall time IF = 10 mA, ∆IF = 2 mA 1µs
CjJunction capacitance VF = 0, f = 1 MHz 15 pF
Detector
PARAMETER CONDITIONS MIN TYP†MAX UNIT
IDK†Dark current VR = 15 V, IF = 0 25 nA
Open circuit voltage IF = 10 mA 0.5 V
IOS Short circuit current limit IF = 10 mA 80 µA
CjJunction capacitance VF = 0, f = 1 MHz 12 pF
Coupler
PARAMETER CONDITIONS MIN TYP†MAX UNIT
K1‡
Servo current gain
IF = 1 mA 0.3% 0.7% 1.5%
K1‡
Ser
v
o
c
u
rrent
gain
IF = 10 mA 0.5% 1.25% 2%
K2§
Forward current gain
IF = 1 mA 0.3% 0.7% 1.5%
K2§
For
w
ard
c
u
rrent
gain
Detector bias IF = 10 mA 0.5% 1.25% 2%
¶
TIL300
voltage = –15 V IF = 1 mA 0.75 1 1.25
K3¶
Transfer gain
TIL300
IF = 10 mA 0.75 1 1.25
K3¶
Transfer
gain
TIL300A
IF = 1 mA 0.9 1 1.10
TIL300A
IF = 10 mA 0.9 1 1.10
Gain tem
p
erature coefficient
K1/K2
IF=10mA
–0.5
%/
°
C
Gain
temperat
u
re
coefficient
K3
I
F =
10
mA
±0.005
%/°C
∆K3#
Transfer gain linearity
IF = 1 to 10 mA ±0.25%
∆K3#
Transfer
gain
linearit
yIF = 1 to 10 mA, TA = 0 to 75°C±0.5%
BW Bandwidth IF = 10 mA,
IF(MODULATION) = ±2 mA RL = 1 kΩ,200 kHz
trRise time IF = 10 mA,
IF(MODULATION) = ±2 mA RL = 1 kΩ,1.75 µs
tfFall time IF = 10 mA,
IF(MODULATION) = ±2 mA RL = 1 kΩ,1.75 µs
Viso†Peak Isolation voltage IIO = 10 µA,
time = 1 minute f = 60 Hz 3535 V
†This symbol is not currently listed within EIA or JEDEC standards for semiconductor symbology.
‡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.
¶T ransfer gain (K3) is the ratio of the forward gain to the servo gain, i.e. K3 = K2/K1.
#T ransfer gain linearity (∆K3) is the percent deviation of the transfer gain K3 as a function of LED input current (IF) or the package temperature.
TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER
SOES019A – OCTOBER 1995 – REVISED JULY 1996
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
P (R-PDIP-T8) PLASTIC DUAL-IN-LINE PACKAGE
4040082/B 03/95
0.310 (7,87)
0.290 (7,37)
0.010 (0,25) NOM
0.400 (10,60)
0.355 (9,02)
58
41
0.020 (0,51) MIN
0.070 (1,78) MAX
0.240 (6,10)
0.260 (6,60)
0.200 (5,08) MAX
0.125 (3,18) MIN
0.015 (0,38)
0.021 (0,53)
Seating Plane
M
0.010 (0,25)
0.100 (2,54) 0°–15°
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001
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Copyright 1999, Texas Instruments Incorporated
