TIL300

 ac or dc Signal Coupling 
 Wide Bandwidth ...>200 kHz 
 High Transfer-Gain Stability...0.005%/ 
 3500 V Peak Isolation
  Typical Applications
    - CPower-Supply Feedbac
    - CMedical-Sensor Isolatio
    - COpto Direct-Access Arrangement (DAA)
    - CIsolated Process-Control Transducer

Emitter
Continuous total power dissipation (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .160 mW
Input LED forward current, I _F. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 mA
Surge current with pulse duration < 10 ms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250 mA
Reverse voltage, V _R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V
Reverse current, I _R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 mA
Detector
Continuous total power dissipation (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mW
Reverse voltage, V _R  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 V
Coupler
Continuous total power dissipation (see Note 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210 mW
Storage temperature range, T_stg  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 150°C
Operating free-air temperature range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

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 TIL300 (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 assumes a magnitude that satisfies the relationship I = V/R1. The operational amplifier. The photocurrent I P1 P1 I magnitude of the current is directly proportional to the LED current through the feedback transfer gain /R1 = K1 I ). The operational amplifier supplies LED current to produce sufficient photocurrent to keep K1(V I F the node voltage V_b  equal to node voltage V_a.