MP108

Produ P r o d u t I n n o v a tt ii o n m MP108,cc tMP108Ao n FFrroom MP108 • MP108A MP108 • MP108A Power Operational Amplifier FEATURES • LOW COST • HIGH VOLTAGE - 200 VOLTS • HIGH OUTPUT CURRENT - 10 AMPS • 100 WATT DISSIPATION CAPABILITY • 300kHz POWER BANDWIDTH APPLICATIONS • INKJET PRINTER HEAD DRIVE • PIEZO TRANSDUCER DRIVE • INDUSTRIAL INSTRUMENTATION • REFLECTOMETERS • ULTRA-SOUND TRANSDUCER DRIVE 34-PIN DIP PACKAGE STYLE FD TYPICAL APPLICATION +VS RF DESCRIPTION The MP108 operational amplifier is a surface mount constructed component that provides a cost effective solution in many industrial applications. The MP108 offers outstanding performance that rivals much more expensive hybrid components yet has a footprint of only 4 sq in. The MP108 has many optional features such as four-wire current limit sensing and external compensation. The 300 kHz power bandwidth and 10 amp output of the MP108 makes it a good choice for piezo transducer drive applications. The MP108 is built on a thermally conductive but electrically insulating substrate that can be mounted to a heat sink. RI PRINT NOZZLE COMMAND VOLTAGE +VS +VB GND -ILIM OUT CC1 +ILIM RLIM CC2 GND -VS -VB PIEZO TRANSDUCER CC EQUIVALENT CIRCUIT DIAGRAM +Vb +Vb GND BACK PLATE TP 8 4 C1 3 2 1 SUBSTRATE BACKPLATE Cc1 Cc2 5 R15 6 Q12 Q13 R9 -IN 34 R7 Q14 Q15A R10 R12 +IN 33 Q19 R17 GND 32 C3 -Vb 30 -Vb 25 Q23 R19 Q24 R20 Q20 Q21 17 -Vs 18 -Vs 19 -Vs LOAD & FEEDBACK NOTES: CC IS NPO (COG) RATED FOR FULL SUPPLY VOLTAGE +VS TO -VS BOTH PINS 3 AND 32 REQUIRED CONNECTED TO SIGNAL GROUND C2 AND C3 ELECTROLYTIC 10µF PER AMP OUTPUT CURRENT C1,C4,C5-8 HIGH QUALITY CERAMIC 0.1µF ALL OUTPUT PINS MUST BE TIED TOGETHER -VS R1 Q1A C5 D1 Q4 R2 Q1B Q2 Q7 Q8 Q9 D2 Q11 Q17 R3 14 +Vs 15 +Vs 16 +Vs Q6 R5 Q3 11 OUT 12 OUT 13 OUT 28 +Ilim 27 -Ilim Q16 Q18 20 OUT 21 OUT 22 OUT Q22 -IN 34 +IN 33 1 TP GND 32 2 3 4 +VB 5 CC1 C5 C6 CC 6 CC2 7 NC 8 +VB 9 NC 10 NC NC 23 22 21 20 OUT OUT OUT C7 RLIM C8 OUT 11 OUT OUT 12 13 14 +VS -VS 19 15 +VS -VS 18 16 +VS -VS 17 INKJET NOZZLE DRIVE The MP108's fast slew rate and wide power bandwith make it an ideal nozzle driver for industrial inkjet printers. The 10 amp output capability can drive hundreds of nozzles simultaneously. EXTERNAL CONNECTIONS C1 + C2 Q15B R11 IC1 R8 BACK GND PLT NC 31 -VB 30 VIEW FROM COMPONENT SIDE NC NC +ILIM -ILIM NC -VB 29 28 27 26 25 24 + C3 C4 CC 100pF 33pF 10pF CC 470pF 220pF 33pF PHASE COMPENSATION GAIN W/O BOOST TYP. SLEW RATE 1 55 V/µS 4 135 V/µS 10 170 V/µS TYP. SLEW RATE GAIN W BOOST 12 V/µS 1 35 V/µS 3 135 V/µS 10 MP108U http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 2009 1 APEX − MP108UREVD MP108 • MP108A ABSOLUTE MAXIMUM RATINGS P r o d u c t I n n o v a t i o nF r o m SUPPLY VOLTAGE, +VS to -VS SUPPLY VOLTAGE, +VB SUPPLY VOLTAGE, -VB OUTPUT CURRENT, peak POWER DISSIPATION, internal, DC INPUT VOLTAGE TEMPERATURE, pin solder, 10s TEMPERATURE, junction2 TEMPERATURE RANGE, storage OPERATING TEMPERATURE, case 200V +VS + 15V6 -VS – 15V6 12A, within SOA 100W +VB to -VB 225°C. 150°C. -40 to 105°C. -40 to 85°C. SPECIFICATIONS PARAMETER INPUT OFFSET VOLTAGE OFFSET VOLTAGE vs. temperature OFFSET VOLTAGE vs. supply BIAS CURRENT, initial3 BIAS CURRENT vs. supply OFFSET CURRENT, initial INPUT RESISTANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, DC NOISE TEST CONDITIONS1 MIN MP108 TYP 1 20 MAX 5 50 20 100 0.1 50 +VB - 15 -VB + 15 MIN MP108A TYP MAX * * 3 * * 70 * 30 * * UNITS mV µV/°C µV/V pA pA/V pA Ω pF V V dB µV RMS dB MHz degrees V V V V A V/µS µS Ω kHz * * * * * * V mA °C/W °C/W °C/W °C Full temperature range 1011 4 92 * * * 1MHz bandwidth, 1kΩ RS 10 * GAIN OPEN LOOP @ 15Hz RL = 10KΩ, CC = 10pF GAIN BANDWIDTH PRODUCT @ 1MHz CC = 10pF PHASE MARGIN Full temperature range OUTPUT VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE, AV = -20 SETTLING TIME, to 0.1% RESISTANCE POWER BANDWIDTH 180VP-P POWER SUPPLY VOLTAGE CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case Full temperature range, f ≤ 60Hz Full temperature range, f < 60Hz Full temperature range IO = 10A IO = -10A IO = 10A, +VB = +VS +10V IO = -10A, -VB = -VS -10V 96 45 10 * * * * * * 11 * * +VS - 10 +VS - 8.6 -VS + 10 -VS + 7 +VS - 1.6 -VS + 5.1 10 CC = 10pF 150 170 2V Step 1 No load, DC 5 CC = 10pF, +VS = 100V, -VS = -100V 300 ±15 ±75 50 ±100 65 1 1.25 13 85 * * * * * * * * * -40 * NOTES: 1. Unless otherwise noted: TC=25°C, compensation CC=100pF, DC input specifications are value given, power supply voltage is typical rating. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10°C of case temperature increase. 4. +VS and -VS denote the positive and negative supply voltages to the output stage. +VB and -VB denote the positive and negative supply voltages to the input stages. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 6. Power supply voltages +VB and -VB must not be less than +VS and -VS respectively. 2 MP108U P r o d u c t I n n o v a t i o nF r o m MP108 • MP108A INTERNAL POWER DISSIPATION, P(W) 100 80 60 40 20 POWER DERATING 90 PHASE RESPONSE W/ BOOST 2 3 1 2 1 CC = 10pF 2 CC = 33pF 3 CC = 100pF RL = 4Ω IO = 1A 1M FREQUENCY, F (Hz) PHASE RESPONSE W/O BOOST 90 2 3 PHASE, Ф (°) 120 2 1 120 PHASE, Ф (°) 150 180 1 150 0 -40 -20 0 20 40 60 80 100 CASE TEMPERATURE, TC (°C) 210 100K 5M 180 300K 1 CC = 10pF 2 CC = 33pF 3 CC = 100pF RL = 4Ω IO = 1A 1 1M FREQUENCY, F (Hz) 10M SMALL SIGNAL RESPONSE W/ BOOST 120 100 80 60 40 20 0 1 RL = 4Ω IO = 1A 10 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz) OPEN LOOP GAIN, A (dB) CC = 33pF CC = 220pF CC = 470pF SMALL SIGNAL RESPONSE W/O BOOST 120 100 80 60 40 20 0 10 NORMALIZED QUIESCENT CURRENT, IO (%) RL = 4Ω IO = 1A DC 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz) NORMALIZED QUIESCENT CURRENT, IO (%) OUTPUT VOLTAGE, VO (VP-P) OPEN LOOP GAIN, A (dB) CC = 10pF CC = 33pF CC = 100pF 200 POWER RESPONSE C C= 10p C C= 100 33p F F C C= 470 pF 20 10K 100K 1M FREQUENCY, F (Hz) NORMALIZED CURRENT LIMIT, (%) 130 120 110 100 90 80 70 -50 CURRENT LIMIT 120 QUIESCENT CURRENT vs. SUPPLY QUIESCENT CURRENT vs. TEMPERATURE 115 110 105 100 95 90 -40 -20 0 20 40 60 80 100 CASE TEMPERATURE, (°C) 20 10 C C= 220 pF C C= 100 pF 5M 100 TC = 85°C 80 TC = 25°C 60 TC = -40°C -25 0 25 50 75 100 CASE TEMPERATURE, TC (°C) 40 0 40 80 120 160 200 TOTAL SUPPLY VOLTAGE, VS (V) 9 8 7 6 5 4 3 2 1 0 0 DISTORTION, THD (%) 0.1 AV = 20 CC = 10pF VS = 52V RL = 4Ω W/O BOOST FROM +V S T FRO M -V S OUTPUT CURRENT FROM +VS OR -VS (A) 1 VOLTAGE DROP FROM SUPPLY, (V) HARMONIC DISTORTION OUTPUT VOLTAGE SWING SAFE OPERATING AREA C 5° C =2 5° T C =2 S, , T C 5°C m =2 5°C 10 0mS C , T =8 10 DC , T C DC PO 0.01 P = 10W O P = 20 0W 0W OOS W/O B TC = 25°C 50mS PULSE O = 10 T WI ROM +V S OOST F WITH B 2 4 6 8 10 OUTPUT CURRENT, IO (A) O HB OS R TF OM -V S 1 0.001 30 100 1K 10K 30K FREQUENCY, F (Hz) 1 10 100 200 SUPPLY TO OUTPUT DIFFERENTIAL, VS-VO (V) 0.2 MP108U 3 MP108 • MP108A GENERAL P r o d u c t I n n o v a t i o nF r o m Please read Application Note 1 "General Operating Considerations" which covers stability, power supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink selection, Apex Precision Power's complete Application Notes library, Technical Seminar Workbook and Evaluation Kits. GROUND PINS The MP108 has two ground pins (pins 3, 32). These pins provide a return for the internal capacitive bypassing of the small signal portions of the MP108. The two ground pins are not connected together on the substrate. Both of these pins are required to be connected to the system signal ground. parasitic oscillation in the output stage of the MP108. Use electrolytic capacitors at least 10µF per output amp required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1µF or greater. In most applications power supply terminals +VB and -VB will be connected to +VS and -VS respectively. Supply voltages +VB and -VB are bypassed internally but both ground pins 3 and 32 must be connected to the system signal ground to be effective. In all cases power to the buffer amplifier stage of the MP108 at pins 8 and 25 must be connected to +VB and -VB at pins 4 and 30 respectively. Provide local bypass capacitors at pins 8 and 25. See the external connections diagram on page 1. +Vs Z1 RF +Vs -IN 34 +Vb 3 GND OUT SAFE OPERATING AREA The MOSFET output stage of the MP108 is not limited by second breakdown considerations as in bipolar output stages. Only thermal considerations and current handling capabilities limit the SOA (see Safe Operating Area graph on previous page). The output stage is protected against transient flyback by the parasitic body diodes of the output stage MOSFET structure. However, for protection against sustained high energy flyback external fast-recovery diodes must be used. RIN IN 34 Q2 Q1 33 +IN -Vs -Vb GND 32 27 ILIM28 ILIM+ RP OUT 11-13 20-22 RLIM 33 RL -Vs Z2 FIGURE 1 OVERVOLTAGE PROTECTION FIGURE 2 4 WIRE CURRENT LIMIT COMPENSATION The external compensation capacitor CC is connected between pins 5 and 6. Unity gain stability can be achieved with any capacitor value larger than 100pF for a minimum phase margin of 45 degrees. At higher gains more phase shift can usually be tolerated in most designs and the compensation capacitor value can be reduced resulting in higher bandwidth and slew rate. Use the typical operating curves as a guide to select CC for the application. An NPO (COG) type capacitor is required rated for the full supply voltage (200V). 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 28 must be connected to the amplifier output side and pin 27 connected to the load side of the current limit resistor RLIM as shown in Figure 2. This connection will bypass any parasitic resistances RP, formed by socket 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 2. The value of the current limit resistor can be calculated as follows: RLIM = .65/ILIMIT OVERVOLTAGE PROTECTION Although the MP108 can withstand differential input voltages up to ±25V, additional external protection is recommended. In most applications 1N4148 signal diodes connected anti-parallel across the input pins is sufficient. In more demanding applications where bias current is important diode connected JFETs such as 2N4416 will be required. See Q1 and Q2 in Figure 1. In either case the differential input voltage will be clamped to ±0.7V. This is usually sufficient overdrive to produce the maximum power bandwidth. Some applications will also need over voltage protection devices connected to the power supply rails. Unidirectional zener diode transient suppressors are recommended. The zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. Whether the zeners are used or not the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as line regulation. See Z1 and Z2 in Figure 1. BOOST OPERATION With the boost feature the small signal stages of the amplifier are operated at a higher supply voltages than the amplifierís high current output stage. +VB (pins 4,8) and -VB (pins 25,30) are connected to the small signal stages and +VS (pins 14-16) and -VS (pins 17-19) are connected to the high current output stage. An additional 10V on the +VB and -VB pins is sufficient to allow the small signal stages to drive the output stage into the triode region and improve the output voltage swing for extra efficient operation when required. When the boost feature is not needed +VS and -VS are connected to the +VB and -VB pins respectively. The +VB and -VB pins must not be operated at supply voltages less than +VS and -VS respectively. BACKPLATE GROUNDING The substrate of the MP108 is an insulated metal substrate. It is required that it be connected to signal ground. Connect pin 2 (back plate) to signal ground. The back plate will then be AC grounded to signal ground through a 1µF capacitor. POWER SUPPLY BYPASSING Bypass capacitors to power supply terminals +VS and -VS must be connected physically close to the pins to prevent local 4 MP108U P r o d u c t I n n o v a t i o nF r o m MP108 • MP108A ContACting CiRRUs LogiC sUPPoRt For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@cirrus.com. International customers can also request support by contacting their local Cirrus Logic Sales Representative. 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