FOD2711A Optically Isolated Error Amplifier Features Description Optocoupler, precision reference and error amplifier in The FOD2711A Optically Isolated Amplifier consists of the popular AZ431L 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%. single package 1.240V 1% reference CTR 100% to 200% 5,000V RMS isolation UL approval E90700, Volume 2 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. Applications Power supplies regulation DC to DC converters When using the FOD2711A, 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. Functional Bock Diagram NC 1 8 LED C 2 7 FB E 3 6 COMP Package Outlines 8 1 8 NC 4 (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 5 GND 8 1 1 www.fairchildsemi.com FOD2711A -- Optically Isolated Error Amplifier June 2010 Pin Number Pin Name Pin Description 1 NC 2 C Phototransistor Collector 3 E Phototransistor Emitter 4 NC 5 GND 6 COMP 7 FB 8 LED Not connected Not connected Ground 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 FOD2711A 2 8 6 3 7 5 (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 R1 R2 www.fairchildsemi.com 2 FOD2711A -- Optically Isolated Error Amplifier Pin Definitions 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 Parameter Value Units TSTG Storage Temperature -40 to +125 C TOPR Operating Temperature -40 to +85 C 260 for 10 sec. C 13.2 V TSOL Lead Solder Temperature VLED Input Voltage ILED Input DC Current 20 mA VCEO Collector-Emitter Voltage 30 V VECO Emitter-Collector Voltage 7 V Collector Current 50 mA PD1 IC Input Power Dissipation(1) 145 mW PD2 Transistor Power Dissipation(2) 85 mW 145 mW PD3 Total Power Dissipation(3) Notes: 1. Derate linearly from 25C at a rate of 2.42mW/C 2. Derate linearly from 25C at a rate of 1.42mW/C. 3. Derate linearly from 25C at a rate of 2.42mW/C. (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 3 FOD2711A -- Optically Isolated Error Amplifier Absolute Maximum Ratings (TA = 25C unless otherwise specified) Input Characteristics Symbol VF VREF Parameter Test Conditions LED Forward Voltage ILED = 10mA, VCOMP = VFB (Fig. 1) Reference Voltage VCOMP = VFB, ILED = 10mA (Fig.1) Min. Typ.* Max. -40C to +85C 1.221 25C 1.228 VREF (DEV) Deviation of VREF Over Temperature(4) VREF / VCOMP Unit 1.5 V 1.259 V 1.240 1.252 4 12 mV TA = -40 to +85C Ratio of Vref Variation to the Output of the Error Amplifier ILED = 10 mA, VCOMP = VREF to 12V (Fig. 2) -1.5 -2.7 mV/V Feedback Input Current ILED = 10mA, R1 = 10k (Fig. 3) 0.15 0.5 A IREF (DEV) Deviation of IREF Over Temperature(4) TA = -40C to +85C 0.15 0.3 A ILED (MIN) Minimum Drive Current VCOMP = VFB (Fig. 1) 55 80 A I(OFF) Off-State Error Amplifier Current VLED = 6V, VFB = 0 (Fig. 4) 0.001 0.1 A Error Amplifier Output Impedance(5) VCOMP = VFB, ILED = 0.1mA to 15mA, f<1 kHZ) 0.25 IREF | ZOUT | Output Characteristics Symbol ICEO Parameter Test Conditions Min. Typ. Max. Unit 50 nA Collector Dark Current VCE = 10V (Fig. 5) BVECO Emitter-Collector Voltage Breakdown IE = 100A 7 V BVCEO Collector-Emitter Voltage Breakdown IC = 1.0mA 70 V Transfer Characteristics Symbol Parameter CTR Current Transfer Ratio VCE (SAT) Collector-Emitter Saturation Voltage Test Conditions ILED = 10mA, VCOMP = VFB, VCE = 5V (Fig. 6) ILED = 10mA, VCOMP = VFB, IC = 2.5mA (Fig. 6) Min. 100 Typ. Max. Unit 200 % 0.4 V Notes: 4. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage, VREF, is defined as: 6 { V REF ( DEV ) /V REF ( T A = 25C ) } x 10 V REF ( ppm/C ) = ---------------------------------------------------------------------------------------------------T A where TA is the rated operating free-air temperature range of the device. 5. The dynamic impedance is defined as |ZOUT| = VCOMP / ILED. When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: V R1 Z OUT, TOT = -------- Z OUT x 1 + -------I R2 (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 4 FOD2711A -- Optically Isolated Error Amplifier Electrical Characteristics (TA = 25C unless otherwise specified) Isolation Characteristics Symbol II-O Parameter Test Conditions Input-Output Insulation Leakage Current RH = 45%, TA = 25C, t = 5s, VI-O = 3000 VDC(6) VISO Withstand Insulation Voltage RH 50%, TA = 25C, t = 1 min.(6) RI-O Resistance (Input to Output) VI-O = 500 VDC(6) Min. Typ. Max. Unit 1.0 A 5000 Vrms 1012 Switching Characteristics Symbol BW Parameter Test Conditions Min. Typ. Max. Unit Bandwidth (Fig. 7) 10 kHZ CMH Common Mode Transient Immunity at Output HIGH ILED = 0mA, Vcm = 10 VPP, RL = 2.2k(7) (Fig. 8) 1.0 kV/s CML Common Mode Transient Immunity at Output LOW ILED = 1mA, Vcm = 10 VPP, RL = 2.2k(7) (Fig. 8) 1.0 kV/s Notes: 6. Device is considered as a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together. 7. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will remain high. Common mode transient immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will remain low. (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 5 FOD2711A -- Optically Isolated Error Amplifier Electrical Characteristics (Continued) (TA = 25C unless otherwise specified) I(LED) I(LED) 8 2 2 8 VF 6 6 V 7 V R1 3 3 7 VCOMP VREF VREF R2 5 5 Figure 2. VREF / VCOMP Test Circuit Figure 1. VREF, VF, ILED (min.) Test Circuit I(LED) I(OFF) 8 2 8 2 IREF 6 6 3 7 V 3 V(LED) 7 V R1 5 5 Figure 3. IREF Test Circuit 8 Figure 4. I(OFF) Test Circuit I(LED) ICEO 8 2 VCE 6 IC 2 VCE 6 3 7 V 3 7 VCOMP VREF 5 5 Figure 5. ICEO Test Circuit (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 Figure 6. CTR, VCE(sat) Test Circuit www.fairchildsemi.com 6 FOD2711A -- Optically Isolated Error Amplifier Test Circuits FOD2711A -- Optically Isolated Error Amplifier Test Circuits (Continued) VCC = +5V DC IF = 10mA RL 47 8 1 1f VOUT 7 2 VIN 0.47V 0.1 VPP 3 6 4 5 Figure 7. Frequency Response Test Circuit VCC = +5V DC IF = 0mA (A) IF = 10mA (B) R1 2.2k VOUT 1 8 2 7 3 6 4 5 _ A B VCM + 10VP-P Figure 8. CMH and CML Test Circuit (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 7 Fig. 9a LED Current vs. Cathode Voltage Fig. 9b LED Current vs. Cathode Voltage 15 150 TA = 25C VCOMP = VFB TA = 25C VCOMP = VFB ILED - SUPPLY CURRENT (mA) ILED - SUPPLY CURRENT (mA) 10 5 0 -5 -10 -15 -1.0 100 50 0 -50 -100 -150 -0.5 0.0 0.5 1.0 1.5 -1 0 1 VCOMP - CATHODE VOLTAGE (V) VCOMP - CATHODE VOLTAGE (V) Fig. 10 Reference Voltage vs. Ambient Temperature 2 Fig. 11 Reference Current vs. Ambient Temperature 280 ILED = 10mA IREF - REFERENCE CURRENT (nA) VREF - REFERENCE VOLTAGE (V) 1.244 1.242 1.240 1.238 1.236 1.234 1.232 1.230 -40 -20 0 20 40 60 80 260 240 220 200 180 160 140 120 -40 100 ILED = 10mA R1 = 10 k -20 0 TA - AMBIENT TEMPERATURE (C) 60 80 100 20 VCC = 13.2V IF - FORWARD CURRENT (mA) IOFF - OFF-STATE CURRENT (NA) 40 Fig. 13 Forward Current vs. Forward Voltage Fig. 12 Off-State Current vs. Ambient Temperature 1000 20 TA - AMBIENT TEMPERATURE (C) 100 10 1 15 25C 10 70C 0C 5 0.1 -40 -20 0 20 40 60 80 0.9 100 TA - AMBIENT TEMPERATURE (C) (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 1.0 1.1 1.2 1.3 1.4 VF - FORWARD VOLTAGE (V) www.fairchildsemi.com 8 FOD2711A -- Optically Isolated Error Amplifier Typical Performance Curves Fig. 15 Collector Current vs. Ambient Temperature Fig. 14 Dark Current vs. Ambient Temperature 10000 30 VCE = 5V IC - COLLECTOR CURRENT (mA) ICEO - DARK CURRENT (nA) VCE = 10V 1000 100 10 1 25 ILED = 20mA 20 15 ILED = 10mA 10 ILED = 5mA 5 ILED = 1mA 0.1 -40 -20 0 20 40 60 80 0 100 0 10 20 TA - AMBIENT TEMPERATURE (C) 30 40 50 60 70 80 90 100 TA - AMBIENT TEMPERATURE (C) Fig. 17 Saturation Voltage vs. Ambient Temperature Fig. 16 Current Transfer Ratio vs. LED Current VCE = 5V VCE(SAT) - SATURATION VOLTAGE (V) (IC/IF) - CURRENT TRANSFER RATIO (%) 0.26 140 120 0C 100 25C 80 70C 60 40 0 5 10 15 20 25 30 35 40 45 0.24 0.22 0.20 0.18 0.16 0.14 0.12 0.10 -40 50 -20 0 20 40 60 80 100 TA - AMBIENT TEMPERATURE (C) ILED - FORWARD CURRENT (mA) Fig. 19 Rate of Change Vref to Vcomp vs. Temperature Fig. 18 Collector Current vs. Collector Voltage 35 DELTA VREF / DELTA VCOMP ( mV/V) IC - COLLECTOR CURRENT (mA) T A = 25C 30 ILED = 20mA 25 20 ILED = 10mA 15 10 ILED = 5mA 5 ILED = 1mA -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -1.6 0 0 1 2 3 4 5 6 7 8 9 -60 10 (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) VCE - COLLECTOR-EMITTER VOLTAGE (V) www.fairchildsemi.com 9 FOD2711A -- Optically Isolated Error Amplifier Typical Performance Curves (Continued) FOD2711A -- Optically Isolated Error Amplifier Typical Performance Curves (Continued) Fig. 20 Voltage Gain vs. Frequency VCC = 10V IF = 10mA VOLTAGE GAIN (dB) 0 RL = 100 -5 -10 RL = 1k RL = 500 -15 0.1 1 10 100 1000 FREQUENCY (kHZ) (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 10 Compensation The FOD2711A is an optically isolated error amplifier. It incorporates three of the most common elements necessary to make an isolated power supply, a reference voltage, an error amplifier, and an optocoupler. It is functionally equivalent to the popular AZ431L shunt voltage regulator plus the CNY17F-3 optocoupler. The compensation pin of the FOD2711A provides the opportunity for the designer to design the frequency response of the converter. A compensation network may be placed between the COMP pin and the FB pin. In typical low-bandwidth systems, a 0.1F capacitor may be used. For converters with more stringent requirements, a network should be designed based on measurements of the system's loop. An excellent reference for this process may be found in "Practical Design of Power Supplies" by Ron Lenk, IEEE Press, 1998. Powering the Secondary Side The LED pin in the FOD2711A powers the secondary side, and in particular provides the current to run the LED. The actual structure of the FOD2711A dictates the minimum voltage that can be applied to the LED pin: The error amplifier output has a minimum of the reference voltage, and the LED is in series with that. Minimum voltage applied to the LED pin is thus 1.24V + 1.5V = 2.74V. This voltage can be generated either directly from the output of the converter, or else from a slaved secondary winding. The secondary winding will not affect regulation, as the input to the FB pin may still be taken from the output winding. Secondary Ground The GND pin should be connected to the secondary ground of the converter. No Connect Pins The NC pins have no internal connection. They should not have any connection to the secondary side, as this may compromise the isolation structure. The LED pin needs to be fed through a current limiting resistor. The value of the resistor sets the amount of current through the LED, and thus must be carefully selected in conjunction with the selection of the primary side resistor. Photo-Transistor Feedback The value of the pull-up resistor, and the current limiting resistor feeding the LED, must be carefully selected to account for voltage range accepted by the PWM IC, and for the variation in current transfer ratio (CTR) of the opto-isolator itself. The Photo-transistor is the output of the FOD2711A. In a normal configuration the collector will be attached to a pull-up resistor and the emitter grounded. There is no base connection necessary. Output voltage of a converter is determined by selecting a resistor divider from the regulated output to the FB pin. The FOD2711A attempts to regulate its FB pin to the reference voltage, 1.24V. The ratio of the two resistors should thus be: Example: The voltage feeding the LED pins is +12V, the voltage feeding the collector pull-up is +10V, and the PWM IC is the Fairchild KA1H0680, which has a 5V reference. If we select a 10K resistor for the LED, the maximum current the LED can see is: R TOP V OUT ------------------------- = --------------1 R BOTTOM V REF The absolute value of the top resistor is set by the input offset current of 0.8A. To achieve 1% accuracy, the resistance of RTOP should be: (12V-2.74V) / 10k = 926A. The CTR of the opto-isolator is a minimum of 100%, and so the minimum collector current of the photo-transistor when the diode is full on is also 926A. The collector resistor must thus be such that: V OUT - 1.24 ------------------------------- > 80A R TOP 10V - 5V ----------------------------------- < 926A or R COLLECTOR > 5.4K; R COLLECTOR select 10k to allow some margin. (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 11 FOD2711A -- Optically Isolated Error Amplifier The FOD2711A Through Hole 0.4" Lead Spacing PIN 1 ID. 4 3 2 PIN 1 ID. 1 4 3 2 1 0.270 (6.86) 0.250 (6.35) 5 6 7 0.270 (6.86) 0.250 (6.35) 8 5 6 0.070 (1.78) 0.045 (1.14) 0.020 (0.51) MIN 0.200 (5.08) 0.140 (3.55) 0.154 (3.90) 0.120 (3.05) 0.022 (0.56) 0.016 (0.41) 7 8 0.390 (9.91) 0.370 (9.40) SEATING PLANE SEATING PLANE 0.390 (9.91) 0.370 (9.40) 0.016 (0.40) 0.008 (0.20) 0.100 (2.54) TYP 0.070 (1.78) 0.045 (1.14) 0.004 (0.10) MIN 0.200 (5.08) 0.140 (3.55) 15 MAX 0.154 (3.90) 0.120 (3.05) 0.300 (7.62) TYP 0.022 (0.56) 0.016 (0.41) 0.016 (0.40) 0.008 (0.20) 0.100 (2.54) TYP Surface Mount 0 to 15 0.400 (10.16) TYP 8-Pin DIP - Land Pattern 0.390 (9.91) 0.370 (9.40) 4 3 2 1 0.070 (1.78) PIN 1 ID. 0.060 (1.52) 0.270 (6.86) 0.250 (6.35) 5 6 7 0.100 (2.54) 8 0.295 (7.49) 0.070 (1.78) 0.045 (1.14) 0.020 (0.51) MIN 0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP Lead Coplanarity : 0.004 (0.10) MAX 0.415 (10.54) 0.300 (7.62) TYP 0.030 (0.76) 0.016 (0.41) 0.008 (0.20) 0.045 (1.14) 0.315 (8.00) MIN 0.405 (10.30) MAX. Note: All dimensions are in inches (millimeters) (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 12 FOD2711A -- Optically Isolated Error Amplifier Package Dimensions Option Example Part Number Description No Option FOD2711A S FOD2711AS SD FOD2711ASD T FOD2711AT 0.4" Lead Spacing V FOD2711AV VDE0884 TV FOD2711ATV VDE0884; 0.4" Lead Spacing SV FOD2711ASV VDE0884; Surface Mount SDV FOD2711ASDV Standard Through Hole Surface Mount Lead Bend Surface Mount; Tape and Reel VDE0884; Surface Mount; Tape and Reel Marking Information 1 V 3 2711A 2 XX YY B 6 4 5 Definitions 1 Fairchild logo 2 Device number 3 VDE mark (Note: Only appears on parts ordered with VDE option - See order entry table) 4 Two digit year code, e.g., `03' 5 Two digit work week ranging from `01' to `53' 6 Assembly package code (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 13 FOD2711A -- Optically Isolated Error Amplifier Ordering Information D0 P0 t K0 P2 E F A0 W1 W B0 P User Direction of Feed d Symbol Description W t D1 Dimension in mm Tape Width 16.0 0.3 Tape Thickness 0.30 0.05 P0 Sprocket Hole Pitch 4.0 0.1 D0 Sprocket Hole Diameter 1.55 0.05 E Sprocket Hole Location 1.75 0.10 F Pocket Location 7.5 0.1 4.0 0.1 P2 P Pocket Pitch 12.0 0.1 A0 Pocket Dimensions 10.30 0.20 B0 10.30 0.20 K0 4.90 0.20 W1 d R Cover Tape Width 1.6 0.1 Cover Tape Thickness 0.1 max Max. Component Rotation or Tilt 10 Min. Bending Radius 30 Reflow Profile 245 C, 10-30 s Temperature (C) 300 260 C peak 250 200 150 Time above 183C, <160 sec 100 50 Ramp up = 2-10C/sec 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 (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 14 FOD2711A -- Optically Isolated Error Amplifier Carrier Tape Specifications AccuPowerTM Auto-SPMTM Build it NowTM CorePLUSTM CorePOWERTM CROSSVOLTTM CTLTM Current Transfer LogicTM DEUXPEED(R) Dual CoolTM EcoSPARK(R) n EfficientMaxTM ESBCTM (R) Fairchild(R) Fairchild Semiconductor(R) FACT Quiet SeriesTM FACT(R) FAST(R) FastvCoreTM FETBenchTM FlashWriter(R)* FPSTM F-PFSTM FRFET(R) SM Global Power Resource Green FPSTM Green FPSTM e-SeriesTM GmaxTM GTOTM IntelliMAXTM ISOPLANARTM MegaBuckTM MICROCOUPLERTM MicroFETTM MicroPakTM MicroPak2TM MillerDriveTM MotionMaxTM Motion-SPMTM OptoHiTTM OPTOLOGIC(R) OPTOPLANAR(R) (R) PDP SPMTM Power-SPMTM PowerTrench(R) PowerXSTM Programmable Active DroopTM QFET(R) QSTM Quiet SeriesTM RapidConfigureTM TM Saving our world, 1mW/W/kW at a timeTM SignalWiseTM SmartMaxTM SMART STARTTM SPM(R) STEALTHTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SupreMOS(R) SyncFETTM Sync-LockTM (R) * The Power Franchise(R) TinyBoostTM TinyBuckTM TinyCalcTM TinyLogic(R) TINYOPTOTM TinyPowerTM TinyPWMTM TinyWireTM TriFault DetectTM TRUECURRENTTM* " SerDesTM UHC(R) Ultra FRFETTM UniFETTM VCXTM VisualMaxTM XSTM * Trademarks of System General Corporation, used under license by Fairchild Semiconductor. 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Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor. The datasheet is for reference information only. Rev. I49 (c)2010 Fairchild Semiconductor Corporation FOD2711A Rev. 1.0.0 www.fairchildsemi.com 15 FOD2711A -- Optically Isolated Error Amplifier TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not intended to be an exhaustive list of all such trademarks.