MP230 MP230 P r o dMP230 u c t IInnnnoovvaa t i o n FFr roomm Power Operational Amplifier FEATURES GENERAL DESCRIPTION The MP230 operational amplifier is a surface mount constructed component that provides a cost effective solution in many industrial applications. The MP230 offers outstanding performance that rivals many much more expensive hybrid components yet has a footprint of only 4.7 sq in. The MP230 has many optional features such as four-wire current limit sensing, a shutdown control and external compensation. In addition, the class A/B output stage biasing can be turned off for lower quiescent current with class C operation in applications where crossover distortion is less important such as when driving motors, for example. A boost voltage feature biases the output stage for close linear swings to the supply rail for extra efficient operation. The MP230 is built on a thermally conductive but electrically insulating substrate that can be mounted to a heat sink. ♦ LOW COST ♦ HIGH VOLTAGE - 100 VOLTS ♦ HIGH OUTPUT CURRENT - 30 AMPS ♦ 210 WATT DISSIPATION CAPABILITY APPLICATIONS ♦ MOTOR DRIVE ♦ MAGNETIC DEFLECTION ♦ PROGRAMMABLE POWER SUPPLIES ♦ INDUSTRIAL AUDIO AMPLIFIER EQUIVALENT CIRCUIT DIAGRAM HSD 8 LSD 7 +Vb 1 +Vs R1 C1 GND R2 Q1A 2 Q1B R3 C2 Q17 Cc2 R13 3.9k Q6 Q20 R7 Q11A R15 Q10 Q11B R8 R10 R9 R16 35 -ILIM Q21 Q19 OUT 24-26 OUT R11 5 R12 30-32 Q13 Q13A R12A Q14 GND 40 C3 R13 Q15 R14 21-23 -Vs 27-29 -Vs -Vb 38 http://www.cirrus.com OUT 36 +ILIM Q18 D2 15-17 OUT 9-11 D3 R6 MP230U Q3A R4 Q5 Iq Q3 R5A Cc1 6 +IN 41 R5 Q4 4 -IN 42 +Vs 18-20 Q16 Q2 D1 12-14 LEVEL SHIFT Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) SEP 2009 1 APEX − MP230UREVH MP230 P r o d u c t I n n o v a t i o nF r o m CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min Max Units SUPPLY VOLTAGE, +VS to -VS 100 V SUPPLY VOLTAGE, +VB (BOOST) (Note 6) +VS + 15 V SUPPLY VOLTAGE, -VB (BOOST) (Note 6) -VS – 15V V OUTPUT CURRENT, peak, within SOA 40 A POWER DISSIPATION, internal, DC 210 W INPUT VOLTAGE +VB to -VB V 225 °C 175 °C TEMPERATURE, pin solder, 10s TEMPERATURE, junction (Note 2) TEMPERATURE RANGE, storage −40 105 °C OPERATING TEMPERATURE, case −40 85 °C SPECIFICATIONS Parameter Test Conditions Min Typ Max Units 1 5 mV 20 50 µV/°C 20 µV/V 100 pA BIAS CURRENT vs. supply 0.1 pA/V OFFSET CURRENT, initial 50 pA INPUT OFFSET VOLTAGE OFFSET VOLTAGE vs. temperature Full temperature range OFFSET VOLTAGE vs. supply BIAS CURRENT, initial (Note 3) INPUT IMPEDANCE, DC 100 INPUT CAPACITANCE GΩ 4 pF COMMON MODE VOLTAGE RANGE +VS - 13 V COMMON MODE VOLTAGE RANGE -VS + 13 V COMMON MODE REJECTION, DC 92 dB NOISE 100kHz bandwidth, 1kΩ RS 5 µV RMS SHUTDOWN, active HSD - LSD 4.5 5 5.5 V SHUTDOWN, inactive HSD - LSD -0.5 0 0.25 V GAIN OPEN LOOP @ 15Hz RL = 1KΩ, CC = 100pF GAIN BANDWIDTH PRODUCT @ 1MHz CC = 100pF PHASE MARGIN Full temperature range 96 dB 2 60 MHz ° OUTPUT VOLTAGE SWING IO = 30A +VS - 10 +VS - 7 V VOLTAGE SWING IO = -30A -VS + 10 -VS + 8 V VOLTAGE SWING IO = 30A, +VB = +VS +10V +VS - 1.5 V VOLTAGE SWING IO = -30A, -VB = -VS -10V -VS + 3.0 V CURRENT, continuous, DC SLEW RATE, A V = -10 2 30 CC = 100pF 12 A 15 V/µS MP230U MP230 P r o d u c t I n n o v a t i o nF r o m Parameter Test Conditions Min Typ Max Units SETTLING TIME, to 0.1% A V = -1, 10V Step, CC = 470pF 2.5 µS RESISTANCE, open loop DC, 10A Load 0.1 Ω POWER SUPPLY VOLTAGE ±15 ±45 ±50 V CURRENT, quiescent, total 27 35 mA CURRENT, boost supply 17 mA CURRENT, shutdown or class C quiescent 17 mA THERMAL RESISTANCE, AC, junction to case (Note 5) Full temp range, f ≥ 60Hz 0.6 °C/W RESISTANCE, DC, junction to case Full temp range, f < 60Hz 0.7 °C/W RESISTANCE, junction to air Full temp range 14 °C/W 85 °C TEMPERATURE RANGE, case -40 NOTES: 1. Unless otherwise noted: TC = 25°C, compensation CC = 470pF, DC input specifications are ± value given, power supply voltage is typical rating. Amplifier operated without boost feature. 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 + and - output stage supply voltages. +VB and -VB denote the + and - input stage supply voltages (boost voltages). 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. EXTERNAL CONNECTIONS C1 + C2 Cc 1 2 3 +Vb GND NC -IN 42 +IN GND NC 41 40 39 -Vb 38 4 5 Rs1 6 7 8 9 10 12 13 14 15 16 17 18 19 20 Iq Cc1 LSD HSD OUT OUT OUT +Vs +Vs +Vs OUT OUT OUT +Vs +Vs +Vs VIEW FROM COMPONENT SIDE NC +ILIM -ILIM NC NC OUT OUT OUT -Vs -Vs -Vs OUT OUT OUT -Vs -Vs -Vs 34 32 30 27 25 23 33 29 26 22 21 35 31 28 24 37 36 Cc2 RLIM LOAD & FEEDBACK Rs4 Rs3 C3 + C4 NOTES: CC IS NPO (COG) RATED FOR FULL SUPPLY VOLTAGE +VS TO -VS. BOTH PINS 2 AND 40 REQUIRED CONNECTED TO SIGNAL GROUND. C2 AND C3 ELECTROLYTIC ≤10µF PER AMP OUTPUT CURRENT. C1 AND C4 HIGH QUALITY CERAMIC ≤0.1µF. SEE TEXT FOR SELECTION OF VALUES FOR Rs1 - Rs4. MP230U 11 Rs2 PHASE COMPENSATION CC GAIN W/O BOOST GAIN W/BOOST TYP. SLEW RATE ≤1 ≤8 8V/µS 470pF ≤4 ≤15 12V/µS 220pF 100pF ≤10 ≤30 42-Pin DIP Package Style FC 15V/µS 3 POWER DERATING 150 100 CC = 220pF CC = 100pF 150 120 CC = 220pF 150 RL = 2.5½ 180 100K 1M FREQUENCY, F(Hz) AV = 10 CC = 100pF +/-VS = 50V RL = 4Ω PO = 1W PO = 10W 0.01 PO = 200W 0.001 30 10K 30K 1K 100 FREQUENCY, F (Hz) VOLTAGE DROP FROM SUPPLY, (V) 0.1 HARMONIC DISTORTION TC = 97 TC = OUTPUT VOLTAGE, VO(VP-P) °C 85 96 20 40 60 80 100 TOTAL SUPPLY VOLTAGE, VS (V) ROM W/O 6 TF OOS -V S B ST FROM W/O BOO +V S 4 2 OST BO WITH 0 M -V S FRO M +V S OST FRO WITH BO 5 10 15 20 25 30 OUTPUT CURRENT, IO (A) 100K FREQUENCY, F(Hz) 500K QUIESCENT CURRENT vs TEMPERATURE 116 112 108 104 100 OUTPUT VOLTAGE SWING 8 0 NORMALIZED QUIESCENT CURRENT, IQ (%) TC pF 70 -50 -25 0 25 50 75 100 CASE TEMPERATURE. TC (°C) 98 5°C °C -40 =2 00 80 100 =1 90 QUIESCENT CURRENT VS SUPPLY 101 99 pF 100 10 10K 1M 2M pF 110 1K 10K 100K 100 FREQUENCY, F(Hz) 70 120 1 0 10 1M 2M CURRENT LIMIT 20 1 - CC = 100pF 2 - CC = 220pF 3 - CC = 470pF RL = 2.5Ω 20 130 1K 10K 100K 100 FREQUENCY, F(Hz) 40 =4 20 1 - CC = 100pF 2 - CC = 220pF 3 - CC = 470pF RL = 2.5Ω 60 =2 40 3 POWER RESPONSE CC 3 60 2 80 OUTPUT CURRENT FROM +VS OR -VS, (A) 2 1 100 2M CC 80 100 120 OPEN LOOP GAIN, A (dB) 1 2M SMALL SIGNAL RESPONSE W/O BOOST NORMALIZED QUIESCENT CURRENT, IQ (%) 100 RL = 2.5½ 180 100K 1M FREQUENCY, F(Hz) CC OPEN LOOP GAIN, A (dB) 120 CC = 100pF 0 -40 -20 0 20 40 60 80 100 CASE TEMPERATURE. TC (°C) 0 10 NORMALIZED CURRENT LIMIT, (%) CC = 470pF 50 120 DISTORTION, THD (%) 90 CC = 470pF 200 SMALL SIGNAL RESPONSE W/ BOOST 4 PHASE RESPONSE W/O BOOST PHASE RESPONSE W/BOOST 90 PHASE Ф, (°) 250 P r o d u c t I n n o v a t i o nF r o m PHASE Ф, (°) INTERNAL POWER DISSIPATION, P(W) MP230 96 -40 -20 0 20 40 60 80 100 CASE TEMPERATURE, (°C) 40 SAFE OPERATING AREA 10 10mS, T = 25°C C 5 100mS, TC = 25°C 200mS, TC = 25°C DC, TC = 25°C DC, TC = 85°C 1 1 10 100 SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V) MP230U MP230 P r o d u c t I n n o v a t i o nF r o m TYPICAL APPLICATION +Vs MOTOR POSITION CONTROL The MOSFET output stage of the MP230 provides superior SOA performance compared to bipolar output stages where secondary breakdown is a concern. The extended SOA is ideal in motor drive applications where the back EMF of the motor may impose simultaneously both high voltage and high current across the output stage transistors. In the figure above a mechanical to electrical feedback position converter allows the MP230 to drive the motor in either direction to a set point determined by the DAC voltage. 12-14 18-20 +Vs 42 DAC OUTPUT POSITION COMMAND GENERAL 1 +Vb 2 Rs1 Rs2 Rs3 Rs4 35 -ILIM * 36 OUT Cc1 +ILIM RLIM Cc2 41 GND 4 6 MOTOR *OUT -Vb DRIVE 40 9-11 -Vs 38 15-17 Cc 24-26 21-23 30-32 27-29 GND -Vs POSITION FEEDBACK 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 MP230 has two ground pins (pins 2, 40). These pins provide a return for the internal capacitive bypassing of the small signal stages of the MP230. 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. BALANCING RESISTOR SELECTION (RS1-RS4) The MP230 uses parallel sets of output transistors. To ensure that the load current is evenly shared among the transistors external balancing resistors RS1-RS4 are required. To calculate the required value for each of the resistors use: R = 4.5 / I2 ,where I is the maximum expected output current. For example, with a maximum output current of 10A each balancing resistor should be 0.045 ohms. Each resistor dissipates 1.125W at the maximum current. Use a non-inductive 2W rated resistor. A ready source for such resistors is the IRC resistor series LR available from Mouser Electronics. SAFE OPERATING AREA The MOSFET output stage of the MP230 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 diodes of the output stage MOSFET structure. However, for protection against sustained high energy flyback external fast-recovery diodes must be used. COMPENSATION The external compensation capacitor CC is connected to pins 4 and 6. Unity gain stability can be achieved with CC = 470pF for a minimum phase margin of 60 degrees. At higher gains more phase shift can usually be tolerated and CC can be reduced resulting in higher bandwidth and slew rate. Use the typical operating curves as a guide to select CC. A 100V NPO (COG) type capacitor is required. Boost operation requires more compensation or higher gains than with normal operation due to the increased capacitance of the output transistors when the output signal swings close to the supply rails. OVERVOLTAGE PROTECTION Although the MP230 can withstand differential input voltages up to ±25V, in some applications additional external protection may be needed. 1N4148 signal diodes connected anti-parallel across the input pins is usually sufficient. In more demanding applications where bias current is important diode connected JFETs such as 2N4416 will be MP230U 5 MP230 P r o d u c t I n n o v a t i o nF r o m required. See Q1 and Q2 in Figure 1. In either case the differential input voltage will be clamped to ±0.7V. This is 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 -IN 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 Q1 power-on overshoot and power-off polarity reversals as well as line regulation. See Z1 and Z2 in Figure 1. POWER SUPPLY BYPASSING +IN +Vs +Vs 42 Z1 1 +Vb 2 GND OUT Q2 41 GND -Vb 40 -Vs Bypass capacitors to power supply terminals +VS and -VS must 38 be connected physically close to the pins to prevent local parasitic oscillation in the output stage of the MP230. Use electrolytic capacitors at least 10µF per output amp required. Bypass the Z2 electrolytic capacitors with high quality ceramic capacitors 0.1µF -Vs or greater. In most applications power supply terminals +VB and FIGURE 1: OVERVOLTAGE PROTECTION -VB will be connected to +VS and -VS respectively. Although +VB and -VB are bypassed internally it is recommended to bypass +VB and -VB with 0.1µF externally. Additionally, ground pins 2 and 40 must be connected to the system signal ground. CURRENT LIMIT R F The two current limit sense lines are to be connected directly across the current limit sense resistor. For the current limit to work 35 correctly pin 36 must be connected to the amplifier output side and IN RIN 42 36 pin 35 connected to the load side of the current limit resistor RLIM -ILIM +I OUT LIM as shown in Figure 2. This connection will bypass any parasitic reRP sistances RP, formed by socket and solder joints as well as internal 41 amplifi er 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: FIGURE 2: 4 WIRE CURRENT LIMIT RLIM = .65/ILIMIT RLIM RL BOOST OPERATION With the boost feature the small signal stages of the amplifier are operated at a higher supply voltages than the amplifier’s high current output stage. +VB (pin 1) and -VB (pin 38) are connected to the small signal stages. An additional 10V on the +VB and -VB pin 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 +VB and -VB respectively. +VB and -VB must not be operated at supply voltages less than +VS and -VS respectively. SHUTDOWN The output stage is turned off by applying a 5V level to HSD (pin 8) relative to LSD (pin 7). This is a non-latching circuit. As long as HSD remains high relative to LSD the output stage will be turned off. LSD will normally be tied to signal ground but LSD may float from -VB to +VB - 15V. Shutdown can be used to lower quiescent current for standby operation or as part of a load protection circuit. BIAS CLASS OPTION Normally pin 5 (Iq) is left open. But when pin 5 is connected to pin 6 (Cc1) the quiescent current in the output stage is disabled. This results in lower quiescent power, but also class C operation of the output stage and the resulting crossover distortion. In many applications, such as driving motors, the distortion may be unimportant and lower standby power dissipation is an advantage. 6 MP230U P r o d u c t I n n o v a t i o nF r o m MP230 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 [email protected]. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. 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Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. MP230U 7