TPA12/ TPA12A Power Operational Amplifier THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000 FEATURES APPLICATIONS • HIGH OUTPUT CURRENT - ±15A PEAK • MOTOR, VALVE AND ACTUATOR CONTROL • HIGH VOLTAGE RATING - ±50V • MAGNETIC DEFLECTION CIRCUITS UP TO 10A • LOW THERMAL RESISTANCE – 1.4 oC/W • POWER TRANSDUCERS UP TO 100 kHz •CURRENT FOLDOVER PROTECTION • AUDIO AMPLIFIERS UP TO 120W RMS • EXCELLENT LINEARITY - CLASS A/B OUTPUT EQUIVALENT SCHEMATIC DESCRIPTION The TPA12 and TPA12A are designed for high voltage and high current applications. They can deliver up to 600 Watts of power to a load. The safe operating area (SOA) at the output stage can be guaranteed for all operating conditions by properly selecting the external current limiting resistor. The class A/B output stage delivers power with remarkably low distortion (see graph page 3). In order to maintain stable bias current and low distortion over the operating temperature range a resistor/thermistor network in the VBE multiplier is used to closely match the VBE of the output transistors. 3 D1 2 7 4 A1 1 5 8 6 EXTERNAL CONNECTIONS AND PIN CONFIGURATIONS RCL+ +Vs +IN 4 -IN CL+ 2 3 1 OUT OUTPUT TOP VIEW 5 6 -Vs 7 8 CL- RCL- F.O. TPA12/12A Rev. B Oct. 2006 TPA12/TPA12A ABSOLUTE MAXIMUM RATINGS Supply Voltage Output Current, within SOA Power Dissipation, internal Input Voltage, differential Input Voltage, common mode 100V 15A 125W ±VS -3V ±VS Temperature, pin solder – 10s Temperature, junction1 Temperature range, storage Operating temperature range, case Electrical Specifications PARAMETER TPA12 CONDITIONS 2,5 INPUT Offset Voltage, initial Offset Voltage, vs. temp. Offset Voltage, vs. supply Offset Voltage, vs. power Bias Current, initial Bias Current, vs. temp. Bias Current, vs. supply Offset Current, initial Offset Current, vs. temp. Input Impedance, DC Input Capacitance Common Mode Volt. Range3 Common Mode Rejection, DC Tc = 25°C full temperature range Tc = 25°C Tc = 25°C Tc = 25°C full temperature range T c= 25°C T c= 25°C full temperature range Tc = 25°C Tc = 25°C full temperature range full temp. range VCM = ±Vs-5 GAIN Open Loop Gain at 10Hz Open Loop Gain at 10Hz Gain Bandwidth Product (1MHz) Power Bandwidth Phase Margin AV = +4 Tc = 25°C, 1kΩ load Full temp range, 8Ω load Tc = 25°C, 8Ω load T c= 25°C, 8Ω load Full temp range, 8Ω load OUTPUT Voltage Swing3 Voltage Swing3 Voltage Swing3 Current, peak Settling Time to .1%, Slew Rate Capacitive Load Capacitive Load Tc = 25°C, Io = 5A full temp range, Io = 80mA Tc = 25°C T c= 25°C, 2V step Tc = 25°C full temp range, Av = 4 full temp range, Av >10 POWER SUPPLY Voltage Current, quiescent full temp range Tc = 25°C THERMAL Resistance, AC junction to case4 Resistance, DC junction to case Resistance, junction to air Temperature Range, case Tc= -55 to +125°C, F>60Hz Tc= -55 to +125°C Tc= -55 to +125°C Meets full range specifications Notes: 300°C 200°C -65 to +150°C -55 to +125°C T c=25°C,TPA12 =10A, TPA12A=15A TPA12A MIN TYP MAX ±6 ±65 ±200 ±Vs-5 74 ±2 ±10 ±30 ±20 ±12 ±50 ±10 ±12 ±50 200 3 ± Vs-3 100 96 13 TYP MAX UNITS ±4 ±40 * * * ±1 * * * 10 * * ±5 * * * * * mV µV/°C µV/V µV/W nA pA/°C pA/V nA pA/°C MΩ pF V db ± 30 ± 500 ± 30 110 108 4 20 20 * * ±Vs-6 ±Vs-5 ±Vs-5 10 2.5 MIN -25 ±20 * * * * * db db MHz kHz o * * * 15 2 4 * * * 1.5 SOA ±10 20 * ±40 25 ±45 50 0.8 1.25 30 0.9 1.4 +85 * * * -55 V V V A µs V/µs nF * * ±50 * V mA * * * * * °C/W °C/W °C/W °C +125 *Same as previous Model. 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. 2. The power supply voltage for all specifications is ±40V unless otherwise noted as a test condition. 3. +Vs and -Vs denote the positive and negative supply rail respectively. Total Vs is measured from +Vs to -Vs. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Exceeding CMV range can cause the output to latch. Caution: The internal substrate contains beryllia (BeO). Do not crush, break, machine or subject the substrate to temperatures in excess of 850C. TPA12/12A Rev. B Oct. 2006 TYPICAL PERFORMANCE CURVES BIAS CURRENT 100 80 60 TPA12 40 20 17.5 2.2 15.0 1.9 1.6 1.3 1.0 .7 20 40 60 80 -50 -25 100 120 140 RCL = 0.18Ω, RFO = 0 7.5 Vo = 24V Vo = 0V 5.0 0 25 50 Vo = -24V 0 -50 -25 0 25 75 100 125 50 75 100 125 CASE TEMPERATURE oC CASE TEMPERATURE oC SMALL SIGNAL RESPONSE PHASE RESPONSE POWER RESPONSE 100 -30 80 -60 60 -90 40 100 -120 20 -150 0 -180 100 1K 10K 100K 1M 10M 1 10 FREQUENCY (Hz) COMMON MODE REJECTION 100 1K 60 40 20 VIN = ±5V, tr = 100ns 4 2 0 -2 -4 100K 1M 0 2 4 HARMONIC DISTORTION Po W =4 0.03 = Po 12 0W 1K 3K 10K FREQUENCY (Hz) 30 20 10 100 30K 100K 1K 10K 100K FREQUENCY (Hz) OUTPUT VOLTAGE SWING 6 1.2 T c = -2 1.0 5o C oC T c = 25 Tc = 8 0.8 oC 5 Tc = 1 oC 25 0.4 300 40 10 12 0.6 0.003 100 10 VOLTAGE DROP FROM SUPPLY (V) = W 0m 10 Po 0.01 8 1.4 NORMALIZED (X) 0.3 0.1 6 1.6 AV = 10 VS = ±37V RL = 4Ω 50K 70K 100K 50 QUIESCENT CURRENT 3 30K 70 TIME (µs) FREQUENCY (Hz) 1 20K INPUT NOISE -8 10K 10 100 -6 1K abs(+Vs)+abs(-Vs)=30V FREQUENCY (Hz) INPUT NOISE VOLTAGE (nV/√Hz)) OUTPUT VOLTAGE (V) 80 100 15 abs(+Vs)+abs(-Vs)=80V PULSE RESPONSE 6 100 10 22 4.6 10K 10K 100K 1M 10M 8 1 32 FREQUENCY (Hz) 120 0 46 6.8 -210 10 abs(+Vs)+abs(-Vs)=100V 68 OUTPUT VOLTAGE (VP-P) 0 PHASE (o) 120 1 COMMON MODE REJECTION (dB) Vo = 0V 10.0 CASE TEMPERATURE oC -20 DISTORTION (%) RCL = 0.06Ω, RFO = ∞ 12.5 2.5 .4 0 0 OPEN LOOP GAIN (dB) TPA12A CURRENT LIMIT 2.5 CURRENT LIMIT (A) 120 NORMALIZED BIAS CURRENT (X) INTERNAL POWER DISSIPATION (W) POWER DERATING 140 40 50 60 70 80 90 TOTAL SUPPLY VOLTAGE (V) 100 5 4 -Vo 3 +Vo 2 1 0 3 6 9 12 15 OUTPUT CURRENT (A) TPA12/12A Rev. B Oct. 2006 DISCUSSION OF PERFORMANCE SAFE OPERATING AREA (SOA) ±Vs The output stage of most power amplifiers has three distinct limitations: 50V 40V 35V 30V 25V 20V 15V 1) The current handling capability of the transistor geometry and the wire bonds. 2) The second breakdown effect which occurs whenever the simultaneous collector current and collector-emitter voltage exceeds specified limits. 15 2.0 =8 3 oC s 5m C =2 5 oC E AT ST 0.6 0.4 0.3 10 20 30 40 2.4A 2.9A 3.7A 4.1A 4.9A 6.3A 8.0A These simplified limits may be exceeded with further analysis using the operating conditions for a specific application. 50 70 CURRENT LIMIT For fixed current limit, leave pin 7 open and use the equations in 1 and 2. DY EA ST T = C 125 o C 1.0 s C T t= T MA L s 1m ER 4.0 m 0.5 TH 6.0 0.30A 0.58A 0.87A 1.50A 2.40A 2.90A 4.20A Short to Common t= SECOND BREAKDOWN 10 t= OUTPUT CURRENT FROM +Vs OR -Vs (A) 3) The junction temperature of the output resistors. transistors. SOA Short to ±VS C,L or EMF Load 100 RCL = 0.65/LCL (1) ICL = 0.65/RCL (2) Where: ICL is the current limit in amperes. SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V) The SOA curves combine the effect of all limits for this Power Op Amp. For a given application, the direction and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is simple for resistive loads but more complex for reactive and EMF generating loads. The following guidelines may save extensive analytical efforts. RCL is the current limit resistor in ohms. ICL= (0.65+(Vo*0.014)) / RCL (3) 1.Capacitive and dynamic* loads up to the following maximums are safe with the current limits set as specified. RCL =( 0.65 + (Vo * 0.014)) / ICL (4) ±Vs Capacitive Load ILIM = 5A ILIM = 10A 50V 40V 35V 30V 25V 20V 15V 200µF 500µF 2.0mF 7.0mF 25mF 60mF 150mF 125µF 350µF 850µF 2.5mF 10mF 20mF 60mF Inductive Load ILIM = 5A ILIM= 10A 5mH 15mH 50mH 150mH 500mH 1,000mH 2,500mH 2.0mH 3.0mH 5.0mH 10mH 20mH 30mH 50mH 2. The amplifier can handle any EMF generating or reactive load and short circuits to the supply rail or common if the current limits are set as follows at Tc = 25OC. * If the inductive load is driven near steady state conditions, allowing the output voltage to drop more than 8V below the supply rail with ILIM = 15A or 25V below the supply rail with ILIM = 5A while the amplifier is current limiting, the inductor must be capacitively coupled or the current limit must be lowered to meet SOA criteria. For certain applications the foldover current limit adds a slope to the current limit which allows more power to be delivered to the load without violating the SOA. For maximum foldover slope, ground pin 7and use equations 3 and 4. Where Vo is the output voltage in volts. Most designers start with either equation 1 to set RCL for the desired output current at 0V out or with equation 4 set to RCL at the maximum output voltage. Equation 3 should then be used to plot the resulting foldover limits on the SOA graph. If equation 3 results in a negative current limit, foldover slope must be reduced. This can happen when the output voltage is the opposite polarity of the supply conducting the current. In applications where a reduced foldover slope is desired, this can be achieved by adding a resistor (RFO) between pin 7 and ground. Use equations 5 and 6 with this new resistor in the circuit. ICL= ((0.65+(VO*0.014)/(10.14+RFO)) / RCL (5) RCL= ((0.65+(VO*0.014)/(10.14+RFO)) / ICL (6) Where RFO is in K ohms. TPA12/12A Rev. B Oct. 2006 MECHANICAL TO3-8 Package TPA12/12A Rev. B Oct. 2006