FOD2711TV ON Semiconductor

OPTICALLY ISOLATED ERROR AMPLIFIER FOD2711 DESCRIPTION The FOD2711 Optically Isolated Amplier consists of the popular RC431A precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide 8 (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%. 1 It is primarily intended for use as the error amplier/reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc converters. When using the FOD2711, power supply designers can reduce the component count and save space in tightly packaged designs. The tight tolerance reference eliminates the need 8 for adjustments in many applications. 8 The device comes in a 8-pin dip white package. 1 1 FUNCTIONAL BLOCK DIAGRAM FEATURES Optocoupler, precision reference and error amplier in single package NC LED 1 8 1.240V 1% reference CTR 100% to 200% 5,000V RMS isolation C FB 2 7 UL approval E90700, Volume 2 CSA approval 1296837 VDE approval 40002463 E 3 6 COMP BSI approval 8702, 8703 NC GND 4 5 APPLICATIONS Power supplies regulation DC to DC converters PIN DEFINITIONS Pin Number Pin Name Pin function description 1NC Not connected 2C Phototransistor Collector 3E Phototransistor Emitter 4NC Not connected 5 GND Ground 6 COMP Error Amplier Compensation. This pin is the output of the error amplier. * 7FBVoltage Feedback. This pin is the inverting input to the error amplier 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. 2003 Fairchild Semiconductor Corporation Page 1 of 15 4/14/03 OPTICALLY ISOLATED ERROR AMPLIFIER FOD2711 TYPICAL APPLICATION FAN4803 PWM V V 1 O Control FOD2711 2 8 6 R1 3 7 R2 5 ABSOLUTE MAXIMUM RATINGS (T = 25C Unless otherwise specied.) A Parameter Symbol Value Units Storage Temperature T -55 to +125 C STG Operating Temperature T -40 to +85 C OPR Lead Solder Temperature T 260 for 10 sec. C SOL Input Voltage V 13.2 V LED Input DC Current I 20 mA LED Collector-Emitter Voltage V 30 V CEO Emitter-Collector Voltage V 7V ECO Collector Current I 50 mA C Input Power Dissipation (note 1) PD1 145 mW Transistor Power Dissipation (note 2) PD2 85 mW Total Power Dissipation (note 3) PD3 145 mW Notes 1. Derate linearly from 25C at a rate of 2.42 mW/ C 2. Derate linearly from 25C at a rate of 1.42 mW/ C. 3. Derate linearly from 25C at a rate of 2.42 mW/ C. 4. Functional operation under these conditions is not implied. Permanent damage may occur if the device is subjected to conditions outside these ratings. 2003 Fairchild Semiconductor Corporation Page 2 of 15 4/14/03