MP106FC

MP106 Power Amplifier FEATURES • • • • • • • Optimized Solution to Drive Dynamic Capacitive Loads Drive Capability 0-540nF Short Term Output current >30A (within SOA) High Internal Power Dissipation of 130W Fixed Gain -15V/V or -20V/V Optimized for Achieving a -36V Output Voltage Swing Slew Rate of 50 V/µs APPLICATIONS • Piezoelectric Actuation for Inkjet Printers DESCRIPTION The MP106 is a high output power amplifier for driving capacitive loads such as piezo devices used in inkjet printing applications. The MP106 utilizes Apex proprietary technology with discrete semiconductor and passive elements on a thermally highly conductive, but electrically isolated package, delivering high power in a very compact module. The amplifier gain is fixed at -15V/V or -20V/V. It is optimized to achieve a -36V output voltage swing even at a small output voltage offset with a single 3V DAC. A combination of internal and external compensation provides optimum slew rate and insures stability while reducing the overall number of required components. Auxiliary voltages (+VB and -VB) for the amplifier stage are used to reduce the power loss in the output drivers. Figure 1: Typical Connection CC +VB RC CBP4 CBP3 Print Nozzle Command Voltage 7 5 -IN 4,8 15-18 MP106 OUT 1 23-26 +IN 33, 38, 39 D1 CBP5 CBP2 CBP1 CBP6 VTMP -VS -VB www.apexanalog.com © Apex Microtechnology Inc. All rights reserved Apr 2018 MP106U Rev B MP106 PINOUT AND DESCRIPTION TABLE The package of MP106 is designed to be mounted above the print head if desired. Therefore, the width of the amplifier is less than the width of the Samba print head. Please check the positioning of the connectors and the location of the components carefully to avoid any damage during mounting or any short to ground. All pins except those marked TP, N/C, TEMP or GAIN must be connected externally for proper operation. The diodes between +VS/+VB and -VB/-VS are recommended to prevent damage of the amplifier during power sequencing. Figure 2: External Connections OUT OUT OUT OUT -VS -VS -VS -VS TEMP GND TEMP CBP3 D1 CBP4 GAIN D2 CBP5 CBP6 9 10 11 12 13 14 15 16 17 18 19 20 N/C 8 N/C GND +VB RC CC 7 -VB CC 6 N/C GND 5 N/C BPLT CBP1 CBP2 4 N/C TP 3 N/C GND 2 -VB +IN 1 -VB 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 -IN +VB N/C OUT OUT OUT OUT +VS +VS +VS +VS N/C N/C Riso CN 2 RN MP106U Rev B MP106 Pin Number Name Description 1 TP Do not connect 2 BPLT Backplate. Connect to signal ground 3 GND Signal Ground 4 +VB Positive amplifier operating voltage (“Boost” voltage) 5 CC External compensation capacitor. Connect compensation capacitor and resistor in series between this pin and ground pin. 6 N/C Not connected 7 GND Signal Ground 8 +VB Positive amplifier operating voltage (“Boost” voltage) 9 GAIN Gain. Connect to pin 7 (GND) for a gain of 20. Leave open for a gain of 15. 10 N/C Not connected 11,12,13,14 OUT Amplifier output. Must be connected also to pins 27, 28, 29, 30 15,16,17,18 +VS Positive supply pins. Connect these pins to power ground. 19,20 N/C Not connected 21 TEMP Temperature sensor output 22 TEMP GND Signal Ground 23,24,25,26 -VS Negative amplifier output stage supply voltage 27,28,29,30 OUT Amplifier output. Must be connected also to pins 11, 12, 13, 14 31,32 N/C Not connected 33 -VB Negative amplifier operating voltage (“Boost” voltage) 34,35,36,37 N/C Not connected 38, 39 -VB Negative amplifier operating voltage (“Boost” voltage) 40 GND Signal Ground 41 +IN Non-inverting amplifier input 42 -IN Inverting amplifier input SPECIFICATIONS Unless notes otherwise, the electrical characteristics are based on TC=25°C, +VS=0V, -VS=-48V, +VB=15V, -VB=-60V ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min Max Units Supply Voltage -Vs -60 -15 V Positive Boost Supply +VB +15 V Negative Boost Supply -VB -VS V Output Current, peak Io 32 A Power Dissipation PD 130 W Input Voltage VIN +10 V MP106U Rev B -VS-15 -0.5 3 MP106 Temperature, pin solder, 10s max TS Operating Temperature Range, case TC -25 225 °C +85 °C AMPLIFIER ELECTRICAL CHARACTERISTICS Parameter Test Conditions Input Voltage, VIN1 Offset Voltage, initial Offset Voltage vs. Temperature Full Temp Range Offset Voltage vs. Supply Min Typ Max Units 0 0-3 5 V -7 3 7 mV 7.2 μV/°C 72 μV/V Bias Current, initial 300 Input Resistance, DC 550 nA 160 MΩ Input Capacitance 3 pF Input Noise @ 10 kHz 12 nV/√Hz 1. With │AV│≥15 and the negative supply rail of -40V, a 5V input would drive the amplifier into the rail. The specification only indicates that an accidental 5V input signal does not cause any harm to the amplifier. GAIN Parameter Test Conditions Min Typ Max Units Amplifier Gain, AV, Pin 9 open -14.7 -15 -15.3 V/V Amplifier Gain, AV, Pin 9 connected to pin 7 -19.7 -20 -20.3 V/V Open Loop Gain (@15 Hz) 96 dB Gain Bandwidth Product, 1 MHz 8.5 MHz Power Bandwidth, 40 p-p 280 kHz OUTPUT Parameter1 Test Conditions Min Typ Max Units Voltage Swing, +VS +VB=13V, -VS=-14V, -VB=-27, lo=10A Voltage Swing, -VS +VB=13V, -VS=-14V, -VB=-27, lo=10A -VS+2 V Voltage Swing, -VS +VB=13V, -VB=-VS=-14V, lO=10A -VS+5 V Current, continuous +VS-1 10 Current, peak Slew rate V A 30 AV=-15, CL=540nF, RL=0.1Ω, VOUT = 40V pulse 45 A V/μs 1. -VS and GND are power supply lines that will carry currents of up to 32A peak (540nF load, 50V/µs slew rate). Therefore proper dimensioning of PCB traces and the power supply itself need to be considered. 4 MP106U Rev B MP106 POWER SUPPLY Parameter1 Test Conditions Supply Voltage, -Vs Min Typ Max Units -60 -48 -15 V Positive Boost Supply, +VB 15 V Negative Boost Supply, -VB -60 V Quiescent current, +VB Iq -VS= -48V, -VB= -61V, +VB= +13V 20 24 28 mA Quiescent current, -VB Iq -VS= -48V, -VB= -61V, +VB= +13V 22 30 36 mA 1. -VS and GND are power supply lines that will carry currents of up to 32A peak (540nF load, 50V/µs slew rate). Therefore proper dimensioning of PCB traces and the power supply itself need to be considered. THERMAL Parameter Test Conditions Min Typ Max Units Resistance, AC, Junction to Case 0.5 °C/W Resistance, DC, Junction to Case 2.1 °C/W 13.2 °C/W 85 °C Resistance, Junction to Air Temperature Range, Case 0 TEMPERATURE SENSOR Parameter Temperature Sensor Output, VTEMP Test Conditions TC = 25°C Temperature Sensor Gain Temperature Accuracy MP106U Rev B TC = -40°C to 85°C MP106 Min Typ MP106 Max Min Typ Max Units 2.98 * V 10 * mV/°C ±1 * °C 5 MP106 TYPICAL PERFORMANCE GRAPHS Figure 3: Closed Loop Phase vs. Frequency Figure 4: Closed Loop Gain vs. Frequency 30 -10 25 -60 20 -110 15 -160 Gain, AV (dB) Phase (0) 40 Av=-20 -210 -260 Av=-15 10 5 0 -5 Av=-15 -310 -10 -360 -15 1 1 10 100 1000 10000 Figure 5: +VB Quiescent Current 1000 10000 35 35 30 YƵŝĞƐĐĞŶƚƵƌƌĞŶƚ;ŵͿ YƵŝĞƐĐĞŶƚƵƌƌĞŶƚ;ŵͿ 100 Figure 6: -VB Quiescent Current 40 30 25 20 15 10 25 20 15 10 5 5 -65 -55 -45 -35 EĞŐĂƟǀĞŽŽƐƚsŽůƚĂŐĞ͕Ͳs;sͿ 6 10 Frequency (kHz) Frequency (kHz) 0 -75 Av=-20 -25 0 -75 -65 -55 -45 -35 -25 EĞŐĂƟǀĞŽŽƐƚsŽůƚĂŐĞ͕Ͳs;sͿ MP106U Rev B MP106 Figure 7: Minimum Slew Rate vs. Output Voltage Figure 8: -VS Voltage drop when -VS=-VB 6 90 80 5 70 4 VDROP, (V) Slew Rate (V/us) 60 50 40 Av=-15 30 3 2 20 1 10 0 0 20 25 30 35 40 2 45 4 6 12 14 16 18 Figure 10: Pulse Response for No Load 0 0 -5 -5 -10 -10 Output Voltage (V) Output Voltage (V) Figure 9: Pulse Response for 540nF Load -15 -20 -25 -30 -35 -15 -20 -25 -30 -35 -40 -40 -6 -4 -2 0 Time (us) MP106U Rev B 10 ILOAD (A) Output Voltage (V) -45 -8 8 2 4 6 -45 -8 -6 -4 -2 0 2 4 6 Time (us) 7 MP106 SAFE OPERATING AREA (SOA) KƵƚƉƵƚƵƌƌĞŶƚ;Ϳ The MOSFET output stage of the MP106 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). The output stage is protected against transient fly back by the parasitic body diodes of the output stage MOSFET structure. However, for protection against sustained high energy fly back external fast recovery diodes must be used. Figure 11: Safe Operating Area (SOA) ϭϬ ŵ Ɛ͕ d  10 d  с ϴϱ 0  d  с сϮ ϱ0  Ϯ ϱ0  1 0.1 1 10 100 EĞŐĂƟǀĞ^ƵƉƉůLJƚŽKƵƚƉƵƚ ŝīĞƌĞŶƟĂů;Ͳs^нsKhd) Figure 12: Power Derating 160 WŽǁĞƌ/ƐƐŝƉĂƟŽŶ;tͿ 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 Cast Temperature TC (°C) 8 MP106U Rev B MP106 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 Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and Evaluation Kits. POWER SEQUENCING A diode should be connected between -VS and -VB as shown in typical connections drawing in figure 1 to avoid damage to the MP106. If diode is not connected, the board should be powered on in the following sequence: • • • -VS -VB +VB AMPLIFIER GAIN The amplifier gain is set to an inverting gain of -15. When the gain pin is shorted to ground (pin 7), the amplifier gain increases to a gain of -20. POWER SUPPLY BYPASSING Bypass capacitors to power supply terminal -VS must be connected physically close to the pins to prevent local parasitic oscillation in the output stage of the MP106. Use electrolytic capacitors at least 10μF per output amp required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1μF or greater. A bypass capacitor of 0.1μF or greater is recommended for the +VB and -VB terminals. SNUBBER CIRCUIT When using the amplifier with a capacitive load up to 540nF, an output snubber circuit should be used to stabilize the output signal of the amplifier. A capacitor value of 22nF and a resistor value of 5Ω are recommended for a snubber circuit. COMPENSATION External compensation capacitor Cc and compensation resistor Rc are connected from pin 5 to pin 7 as shown in typical connection drawing in figure 1. For piezo loads up to 540nF, a compensation of 220pF and 750Ω are recommended. MP106U Rev B 9 MP106 SERIES ISOLATION RESISTOR, RS To insure stability with all capacitive loads a series isolation resistor should be included between the output and the load as shown in the external connections drawing. A 0.1Ω resistor works well for capacitive loads up to 540nF. The resistor will affect the rise and fall time of the output pulse at the capacitive load. This can be compensated for on the input signal. BACKPLATE GROUNDING The substrate of the MP106 is an insulated metal substrate. It is required that it be connected to signal ground. This is accomplished when the ground pin (Pin 7) is properly connected to signal ground TEMPERATURE SENSING The MP106 consists of two IC temperature sensors, located near the two output MOSFETs. The scale factor of the sensor is 10mV/°C. The output voltage of the sensor is equal to approximately 2.98 V at room temperature (Tc = 25°C). The sensor has an uncalibrated temperature error of + 1°C. The scale factor of the sensor can be adjusted by connecting an optional resistor “R” (refer Fig 13) to TMP pin using the following equation, where T is case temperature in °C. Figure 13: Temperature Sensor Temperature Sensor IC VT 10KΩ To DVM MP106 Pin 21 R R V T = -------------------------  0.01T + 2.73  10000 + R 10 MP106U Rev B MP106 POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. 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 reversal as well as line regulation. Conditions which can cause open circuits or polarity reversals on either power supply rail should be avoided or protected against. Reversals or opens on the negative supply rail is known to induce input stage failure. Unidirectional TVS diodes prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible. MP106U Rev B 11 MP106 PACKAGE OPTIONS Part Number Apex Package Style Description MP106 FC 42-pin Open Frame PACKAGE STYLE FC Note: Shown components and component location for illustration purposes only. 12 MP106U Rev B MP106 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 Microtechnology, Inc. All other corporate names noted herein may be trademarks of their respective holders. MP106U Rev B 13