FOD2711

FOD2711 — Optically Isolated Error Amplifier August 2008 FOD2711 Optically Isolated Error Amplifier Features ■ Optocoupler, precision reference and error amplifier in ■ ■ ■ ■ Description The FOD2711 Optically Isolated Amplifier consists of the popular RC431A 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 FOD2711, 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 8-pin dip white package. single package 1.240V ± 1% reference CTR 100% to 200% 5,000V RMS isolation UL approval E90700, Volume 2 CSA approval 1296837 VDE approval 40002463 BSI approval 8702, 8703 Applications ■ Power supplies regulation ■ DC to DC converters Functional Bock Diagram Package Outlines NC 1 8 LED 8 1 C 2 7 FB E 3 6 COMP 8 8 1 1 NC 4 5 GND ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com FOD2711 — Optically Isolated Error Amplifier Pin Definitions Pin Number 1 2 3 4 5 6 7 8 Pin Name NC C E NC GND COMP FB LED Not connected Phototransistor Collector Phototransistor Emitter Not connected Ground Pin Description Error Amplifier Compensation. This pin is the output of the error amplifier.* Voltage Feedback. This pin is the inverting input to the error amplifier 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 V1 FAN4803 PWM Control VO FOD2711 2 8 6 R1 3 7 R2 5 ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 2 FOD2711 — Optically Isolated Error Amplifier Absolute Maximum Ratings (TA = 25°C unless otherwise specified) 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 TSTG TOPR TSOL VLED ILED VCEO VECO IC PD1 PD2 PD3 Parameter Storage Temperature Operating Temperature Lead Solder Temperature Input Voltage Input DC Current Collector-Emitter Voltage Emitter-Collector Voltage Collector Current Input Power Dissipation(1) Transistor Power Dissipation(2) Total Power Dissipation(3) Value -40 to +125 -40 to +85 260 for 10 sec. 13.2 20 30 7 50 145 85 145 Units °C °C °C V mA V V mA mW mW mW 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. ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 3 FOD2711 — Optically Isolated Error Amplifier Electrical Characteristics (TA = 25°C unless otherwise specified) Input Characteristics Symbol VF VREF Parameter LED Forward Voltage Reference Voltage -40°C to +85°C 25°C Test Conditions ILED = 10mA, VCOMP = VFB (Fig. 1) VCOMP = VFB, ILED = 10mA (Fig.1) Min. Typ.* Max. 1.5 1.221 1.228 1.240 4 -1.5 1.259 1.252 12 -2.7 Unit V V mV mV/V VREF (DEV) Deviation of VREF Over Temperature(4) ∆VREF / ∆VCOMP IREF IREF (DEV) ILED (MIN) I(OFF) | ZOUT | Ratio of Vref Variation to the Output of the Error Amplifier Feedback Input Current Deviation of IREF Over Temperature(4) Minimum Drive Current Off-State Error Amplifier Current Error Amplifier Output Impedance(5) TA = -40 to +85°C ILED = 10 mA, VCOMP = VREF to 12V (Fig. 2) ILED = 10mA, R1 = 10kΩ (Fig. 3) TA = -40°C to +85°C VCOMP = VFB (Fig. 1) VLED = 6V, VFB = 0 (Fig. 4) VCOMP = VFB, ILED = 0.1mA to 15mA, f 5.4K Ω ; R COLLECTOR select 10kΩ to allow some margin. Feedback Output voltage of a converter is determined by selecting a resistor divider from the regulated output to the FB pin. The FOD2711 attempts to regulate its FB pin to the reference voltage, 1.24V. The ratio of the two resistors should thus be: R TOP V OUT ------------------------- = -------------- – 1 R BOTTOM V REF The absolute value of the top resistor is set by the input offset current of 0.8µA. To achieve 1% accuracy, the resistance of RTOP should be: V OUT – 1.24 ------------------------------- > 80 µ A R TOP ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 11 FOD2711 — Optically Isolated Error Amplifier Package Dimensions Through Hole PIN 1 ID. 4 3 2 1 4 3 2 1 0.4" Lead Spacing PIN 1 ID. 0.270 (6.86) 0.250 (6.35) 5 6 7 8 0.270 (6.86) 0.250 (6.35) 0.390 (9.91) 0.370 (9.40) 5 6 7 8 SEATING PLANE 0.070 (1.78) 0.045 (1.14) 0.200 (5.08) 0.140 (3.55) 0.020 (0.51) MIN SEATING PLANE 0.390 (9.91) 0.370 (9.40) 0.070 (1.78) 0.045 (1.14) 0.200 (5.08) 0.140 (3.55) 0.004 (0.10) MIN 0.154 (3.90) 0.120 (3.05) 0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP 0.016 (0.40) 0.008 (0.20) 15° MAX 0.300 (7.62) TYP 0.154 (3.90) 0.120 (3.05) 0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP 0.016 (0.40) 0.008 (0.20) 0° to 15° 0.400 (10.16) TYP Surface Mount 0.390 (9.91) 0.370 (9.40) 4 3 2 1 8-Pin DIP – Land Pattern 0.070 (1.78) PIN 1 ID. 0.270 (6.86) 0.250 (6.35) 0.060 (1.52) 5 6 7 8 0.100 (2.54) 0.295 (7.49) 0.415 (10.54) 0.030 (0.76) 0.070 (1.78) 0.045 (1.14) 0.020 (0.51) MIN 0.300 (7.62) TYP 0.016 (0.41) 0.008 (0.20) 0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP Lead Coplanarity : 0.004 (0.10) MAX 0.045 (1.14) 0.315 (8.00) MIN 0.405 (10.30) MAX. Note: All dimensions are in inches (millimeters) ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 12 FOD2711 — Optically Isolated Error Amplifier Ordering Information Option No Option S SD T V TV SV SDV Example Part Number FOD2711A FOD2711AS FOD2711ASD FOD2711AT FOD2711AV FOD2711ATV FOD2711ASV FOD2711ASDV Description Standard Through Hole Surface Mount Lead Bend Surface Mount; Tape and Reel 0.4" Lead Spacing VDE0884 VDE0884; 0.4” Lead Spacing VDE0884; Surface Mount VDE0884; Surface Mount; Tape and Reel Marking Information 1 2711 V 3 4 2 6 XX YY B 5 Definitions 1 2 3 4 5 6 Fairchild logo Device number VDE mark (Note: Only appears on parts ordered with VDE option – See order entry table) Two digit year code, e.g., ‘03’ Two digit work week ranging from ‘01’ to ‘53’ Assembly package code ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 13 FOD2711 — Optically Isolated Error Amplifier Carrier Tape Specifications D0 K0 t P0 P2 E A0 W1 B0 F W d User Direction of Feed P D1 Symbol W t P0 D0 E F P2 P A0 B0 K0 W1 d R Pocket Pitch Tape Width Description Tape Thickness Sprocket Hole Pitch Sprocket Hole Diameter Sprocket Hole Location Pocket Location Dimension in mm 16.0 ± 0.3 0.30 ± 0.05 4.0 ± 0.1 1.55 ± 0.05 1.75 ± 0.10 7.5 ± 0.1 4.0 ± 0.1 12.0 ± 0.1 10.30 ±0.20 10.30 ±0.20 4.90 ±0.20 Pocket Dimensions Cover Tape Width Cover Tape Thickness Max. Component Rotation or Tilt Min. Bending Radius 1.6 ± 0.1 0.1 max 10° 30 Reflow Profile 300 Temperature (°C) 250 200 150 100 50 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Time (Minute) • Peak reflow temperature: 260 C (package surface temperature) • Time of temperature higher than 183 C for 160 seconds or less • One time soldering reflow is recommended ©2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 14 245 C, 10–30 s 260 C peak Time above 183C,