MP38CLA Apex Microtechnology

MP38 MP38A RoHS Power Operational Amplifier COMPLIANT FEATURES High Internal Dissipation 125W 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 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 125W and its power supply voltages can range up to 100V (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 compen- sation 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. Apex Microtechnology Inc. Mar 2016 www.apexanalog.com All rights reserved MP38U Rev LMP38 MP38A Figure 1: Equiv Schematic 1 +Vs +Vb 12 13 +Vs C1 C2 14 Q1A +Vs Q1B GND 2 Q4 Q2 D1 Q3 Cc2 4 Cc1 6 Q7 24 +Ilim Q6 -Ilim Q5 23 15 OUT Q10 Q11B 30 -IN 16 OUT Q11A 17 OUT 29 +IN Q12 Iq 25 Q13 28 GND Q14 -Vs Q15 18 C3 -Vs 19 -Vb 26 20 -Vs TYPICAL CONNECTION Figure 2: Typical Connection R F +V +V S B 1F 10F 1F R +V I S +V B V -CL OUT -IN R CL +CL OUT MP38 R C +IN R C L C I Q -V B C C -V R S C NC 10F 1F 1F -V -V S B 2 MP38U Rev L