MP38 * MP38A MP38 * MP38A MP38, MP38A Power Operational Amplifier FEATURES * * * * * HIGH INTERNAL DISSIPATION -- 125 Watts HIGH VOLTAGE, HIGH CURRENT -- 200V, 10A HIGH SLEW RATE -- 10V/s 4 WIRE CURRENT LIMIT SENSING OPTIONAL BOOST VOLTAGE INPUTS APPLICATIONS * * * * * LINEAR AND ROTARY MOTOR DRIVES YOKE/MAGNETIC FIELD EXCITATION PROGRAMMABLE POWER SUPPLIES TO 95V INDUSTRIAL AUDIO PACKAGE OPTION - DIP10 - DUAL-IN-LINE DESCRIPTION The MP38 is a cost-effective high voltage MOSFET power operational amplifier constructed with surface mount components on a thermally conductive but electrically isolated substrate. While the cost is low the MP38 offers many of the same features and performance specifications found in much more expensive hybrid power amplifiers. The metal substrate allows the MP38 to dissipate power up to 125 watts and its power supply voltages can range up to 100 Volts (200V total). Optional boost voltage inputs allow the small signal portion of the amplifier to operate at higher supply voltages than the high current output stage. The amplifier is then biased to achieve close linear swings to the supply rails at high current for extra efficient operation. External compensation tailors performance to the user needs. A four-wire sense technique allows current limiting without the need to consider internal or external mili-ohm parasitic resistance in the output line. An Iq pin is available which can be used to shut off the quiescent current in the output stage. The output stage then operates class C and lowers quiescent power dissipation. This is useful in applications where output crossover distortion is not important. EQUIVALENT SCHEMATIC 12 +Vs +Vb 1 C1 GND 2 13 +Vs C2 Q1A 14 +Vs Q1B Q4 Q2 D1 Q3 Cc2 4 Q7 Cc1 6 Q6 Q5 -IN 30 24 +Ilim 23 -Ilim 15 OUT Q10 Q11B 16 OUT Q11A 17 OUT +IN 29 Q12 Iq 25 GND 28 Q14 Q15 Q13 18 -Vs C3 19 -Vs -Vb 26 20 -Vs www.apexanalog.com MP38U Copyright (c) Apex Microtechnology, Inc. 2012 (All Rights Reserved) SEP 2012 MP38U REVJ1 MP38 * MP38A ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min SUPPLY VOLTAGE, +VS to -VS BOOST VOLTAGE Max Units 200 V VS 20 V OUTPUT CURRENT, within SOA 25 A POWER DISSIPATION, internal 125 W INPUT VOLTAGE, differential -20 +20 V INPUT VOLTAGE, common mode -VB +VB V 200 C 175 C TEMPERATURE, pin solder - 10s TEMPERATURE, junction (Note 2) TEMPERATURE, storage -40 +105 C OPERATING TEMPERATURE RANGE, case -40 +85 C SPECIFICATIONS Parameter Test Conditions (Note 1) MP38 Min MP38A Typ Max 5 10 Min Typ Max Units * 3 mV INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature Full temp range OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. power Full temp range 50 * V/C 15 * V/V 30 * V/W BIAS CURRENT, initial 10 BIAS CURRENT, vs. supply .01 OFFSET CURRENT, initial 10 INPUT IMPEDANCE, DC INPUT CAPACITANCE 200 * 100 * 50 * pA pA/V 30 pA 1010 * 20 * pF COMMON MODE VOLTAGE RANGE Full temp range VB+15 VB+12 * * V COMMON MODE REJECTION, DC Full temp, range, VCM= 20V 86 98 * * dB INPUT NOISE 100kHz BW, RS = 1K * Vrms * dB 2 * MHz 10 GAIN OPEN LOOP, @ 15Hz Full temp range, CC = 100pF GAIN BANDWIDTH PRODUCT I O = 10A 94 113 * POWER BANDWIDTH RL = 20, VO = 180VP-P CC = 100pF 20 * kHz PHASE MARGIN Full temp range 60 * 2 MP38U MP38 * MP38A Test Conditions (Note 1) Parameter MP38 Min Typ MP38A Max Min Typ Max Units OUTPUT VOLTAGE SWING I O = 10A VS+8.8 VS+6.6 * * V VOLTAGE SWING VB = VS 10V, I O = 10A VS+6.8 * * V SETTLING TIME to .1% A V = +1,10V step, R L = 4 * S SLEW RATE A V = -10, CC = 100pF 10 * V/S CAPACITIVE LOAD Full temp range, A V = +1 10 * nF VS+4 2.5 RESISTANCE 4 CURRENT, CONTINUOUS * 10 11 A * V POWER SUPPLY VOLTAGE Full temp range 15 75 100 * * CURRENT, quiescent, boost supply 22 * mA CURRENT, quiescent, total 26 * mA Full temp range, F>60Hz .9 * C/W RESISTANCE, DC, junction to case Full temp range, F<60Hz 1.2 * C/W RESISTANCE, junction to air Full temp range THERMAL RESISTANCE, AC, junction to case (Note 3) (Note 4) TEMPERATURE RANGE, case Meets full range specification 12 -40 * +85 * C/W * C NOTES: * The specification of MP38A is identical to the specification for MP38 in applicable column to the left. 1. Unless otherwise noted: TC = 25C, RC = 100, CC = 470pF. DC input specifications are value given. Power supply voltage is typical rating. VB = VS. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. For guidance, refer to the heatsink data sheet. 3. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 4. The MP38 must be used with a heat sink or the quiescent power may drive the unit to junction temperatures higher than 175C. CAUTION MP38U The MP38 is constructed from MOSFET transistors. ESD handling procedures must be observed. 3 MP38 * MP38A 80 60 40 20 0 0 20 40 60 80 100 CASE TEMPERATURE, TC (C) 100pF 80 60 40 20 0 -20 1 220pF 470pF 100 10K 1M FREQUENCY, F (Hz) 100M SLEW RATE vs. COMP. SLEW RATE (V/s) 60 50 40 30 20 10 0 0 100 200 300 400 500 COMPENSATION CAPACITOR, (pF) PULSE RESPONSE 4 0.1 150W 0.5W 50W 5W 0.01 0.001 100 1K 10K FREQUENCY, F(Hz) -40 220pF -60 470pF -80 -100 470pF -120 220pF -140 100pF -160 -180 -200 1 10 47pF 100 10K 1M FREQUENCY, F (Hz) 100M 1ms 100s 10s 1 85C 25C 5 10 100 200 SUPPLY TO OUTPUT DIFFERENTIAL, VS-VO (V) 1K 47pF 100pF -20 10ms 10 0.2 100K SMALL SIGNAL PHASE 0 OPEN LOOP PHASE, O () 47pF 100 70 1 SMALL SIGNAL RESPONSE 120 AV = 10 VS = 96V RL = 24 SOA 20 OUTPUT CURRENT, IO (A) 100 HARMONIC DISTORTION 10 OUTPUT VOLTAGE, VO (VP-P) PERCENT DISTORTION + NOISE 120 140 OPEN LOOP GAIN, A (dB) POWER DERATING 140 OUTPUT VOLTAGE DROP FROM SUPPLY, VS-VO (V) INTERNAL POWER DISSIPATION, P(W) TYPICAL PERFORMANCE GRAPHS POWER RESPONSE 47pF 100 100pF 470pF 10 220pF 1 10 100 FREQUENCY (KHz) 1K OUTPUT VOLTAGE SWING 9 8 7 -V B = 6 5 -V S +VB = +VS 4 3 V 2 -V B 1 0 0 = -V S -10 10V V + +V B= + S 2 4 6 8 OUTPUT CURRENT, IO (A) 10 PULSE RESPONSE MP38U MP38 * MP38A EXTERNAL CONNECTIONS * * 3 2 1 4 5 6 7 8 10 9 +Vs +Vs +Vs NC NC NC NC NC Cc1 NC Cc2 NC GND +Vb Cc 11 12 13 14 COMPONENT SIDE VIEW * OUT OUT OUT -Vs 19 18 17 16 15 -Vs 20 -Vs NC NC -llim +Ilim Iq -Vb 27 26 25 24 23 22 21 NC GND +IN -IN 30 29 28 * * SEE "BYPASSING" PARAGRAPH Phase Compensation Gain Cc Rc 1 470pF 100 3 220pF Short 10 100pF Short 30-pin DIP PACKAGE STYLE CL TYPICAL APPLICATION RF Ref: Application Note 25 The high power bandwidth and high voltage output of the MP38 allows driving ultra-sonic transducers via a resonant circuit including the transducer and a matching transformer. The load circuit appears resistive to the MP38. +50V 1 ULTRASONIC DRIVE RI 12-14 +VS +VB 30 23 MP38 +IN GENERAL Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www. apexanalog.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; Apex's complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. MP38U 24 +ILIM OUT 15-17 CC2 CC1 4 IQ 6 25 CC NC -ILIM -IN 29 -VB -VS 26 18-20 -50V ULTRA-SONIC AMPLIFIER RCL TUNED TRANSFORMER 5 MP38 * MP38A CURRENT LIMIT The two current limit sense lines are to be connected directly across the current limit sense resistor. For the current limit to work correctly pin 24 must be connected to the amplifier output side and pin 23 connected to the load side of the current limit resistor, RCL, as shown in Figure 1. This connection will bypass any parasitic resistances, Rp, formed by sockets and solder joints as well as internal amplifier losses. The current limiting resistor may not be placed anywhere in the output circuit except where shown in Figure 1. The value of the current limit resistor can be calculated as follows: .7 R = CL I RF RI 30 INPUT 29 23 24 MP38 RP RCL 15-17 RL FIGURE 1. CURRENT LIMIT LIMIT BOOST OPERATION With the VB feature the small signal stages of the amplifier are operated at higher supply voltages than the amplifier's high current output stage. +VS (pins 12-14) and -VS (pins 18-20) are connected to the high current output stage. An additional 10V on the VB pins is sufficient to allow the small signal stages to drive the output transistors into saturation and improve the output voltage swing for extra efficient operation when required. When close swing to the supply rails is not required the +VB and +VS pins must be strapped together as well as the -VB and -VS pins. The boost voltage pins must not be at a voltage lower than the VS pins. BYPASSING Proper bypassing of the power supply pins is crucial for proper operation. Bypass the VS pins with a aluminum electrolytic capacitor with a value of at least 10F per amp of expected output current. In addition a .47F to 1F ceramic capacitor should be placed in parallel with each aluminum electrolytic capacitor. Both of these capacitors have to be placed as close to the power supply pins as physically possible. If not connected to the VS pins (See BOOST OPERATION) the VB pins should also be bypassed with a .47F to 1F ceramic capacitor. USING THE Iq PIN FUNCTION Pin 25 (Iq) can be tied to pin 6 (Cc1) to eliminate the class AB biasing current from the output stage. Typically this would remove 1-4 mA of quiescent current. The resulting decrease in quiescent power dissipation may be important in some applications. Note that implementing this option will raise the output impedance of the amplifier and increase crossover distortion as well. COMPENSATION The external compensation components CC and RC are connected to pins 4 and 6. Unity gain stability can be achieved at any compensation capacitance greater than 470 pF with at least 60 degrees of phase margin. At higher gains more phase shift can be tolerated in most designs and the compensation capacitance can accordingly be reduced, resulting in higher bandwidth and slew rate. APPLICATION REFERENCES For additional technical information please refer to the following application notes. AN 1 General Operating Considerations AN 11 Thermal Techniques AN 38 Loop Stability with Reactive Loads 6 MP38U MP38 * MP38A NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. 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PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER'S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks of their respective holders. www.apexanalog.com MP38U Copyright (c) Apex Microtechnology, Inc. 2012 (All Rights Reserved) SEP 2012 7 MP38U REVJ