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PA79
MICROTECHNOLOGY
FEATURES
* A UNIQUE (Patent Pending) TECHNIQUE FOR VERY LOW QUIESCENT CURRENT < 1 mA * OVER 350 V/S SLEW RATE * WIDE SUPPLY VOLTAGE * Single Supply: 10V to 350V * Split Supplies: +/- 10V to +/- 175V * OUTPUT CURRENT- 150mA cont. ; 200mA Pk * DUAL AMPLIFIER * UP TO TBD WATT DISSIPATION CAPABILITY * OVER 200 kHz POWER BANDWIDTH
TYPICAL APPLICATION
APPLICATIONS
* * * * PIEZOELECTRIC POSITIONING AND ACTUATION ELECTROSTATIC DEFLECTION DEFORMABLE MIRROR ACTUATORS CHEMICAL AND BIOLOGICAL STIMULATORS
DESCRIPTION
The PA79 is a dual high voltage, high speed Precision IC power op amp with performance and unique features not found previously in any commercially available OpAmp. This approach provides a cost-effective, high density solution to applications where multiple amplifiers are required. Novel input stage design of this amplifier provides extremely high slew rates in pulse applications while maintaining low quiescent current of under 1mA. This novel input stage also has the effect of adding variables to the power response and slew rate characteristics of the amplifier. To a lesser degree, there are also input related effects on open loop gain and phase. It is important to note that slew rate for the PA79 is independent of supply current. However the slew rate is a strong function of input voltage amplitude. The output stages are well protected with user defined current limit although the Safe Operating Area (SOA) must be observed for reliable protection. Proper heat sinking is required for maintaining maximum reliability. External phase compensation provides the user with great flexibility in trading gain, stability and bandwidth.
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The typical application diagram shows a bridge connection of the two amplifiers inside a dual PA79 and provides output voltage swing twice that of one amplifier. Two possible situations where there is an advantage would be in applications with low supply voltages, or applications that operate amplifiers near their maximum voltage ratings in which a single amplifier could not provide sufficient drive. The bridge connection also effectively doubles the slew rate, and non-linearity becomes symmetrical reducing second harmonic distortion in comparison to a single amplifier circuit.
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20-PIN PSOP PACKAGE STYLE DK
EXTERNAL CONNECTIONS - DK PACKAGE
NOTES: 1. The package heat slug needs to be connected to a stable reference such as gnd for high slew rates. Please refer to special considerations section for details. 2. Supply bypassing required for -Vs and +Vs. 3. For Cc and Rc values refer to power supply biasing section. 4. Dimple and ESD triangle denotes pin 1.
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA79
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, peak POWER DISSIPATION, internal, DC INPUT VOLTAGE, Differential INPUT VOLTAGE, Common Mode TEMPERATURE, pin solder, 10s TEMPERATURE, junction2 TEMPERATURE RANGE, storage OPERATING TEMPERATURE, case TESTCONDITIONS1 MIN
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
350V 200mA, within SOA TBD 15V Vs TBD 150C. -55 to 125C. -40 to 125C TYP 8 -63 8.5
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, pos. COMMON MODE VOLTAGE RANGE, neg. COMMON MODE REJECTION, DC NOISE GAIN OPEN LOOP @ 15Hz GAIN BANDWIDTH PRODUCT @ 1MHz PHASE MARGIN OUTPUT VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE SETTLING TIME, to 0.1% POWER BANDWIDTH, 300VP-P POWERSUPPLY VOLTAGE CURRENT, quiescent
0 to 125C (CaseTemperature)
1MHz bandwidth, 1kRS
Full temperature range
THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case
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IO = 10mA IO = 100mA IO = 150mA 150V Supply
PackageTabConnectedtoGND 2V Step +VS = 160V, -VS = -160V
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90 89 150 100 10 0.2 -40
12 106
+VS - 2 -VS + 5.5 TBD
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MAX 40 32 200 400 |VS| - 12 175 2.5
UNITS mV V/C V/V pA pA/V pA pF V V dB V RMS dB MHz V V V mA V/S S kHz V mA C/W C/W C/W C
120 1 50
|VS| - 2 TBD |VS| - 10 350 TBD 200 150 0.7
Full temperature range, f 60Hz Full temperature range, f < 60Hz Full temperature range
TBD 85
NOTES: 1. Unless otherwise noted: TC = 25C, DC input specifications are value given, power supply voltage is typical rating. Ratings apply to one amplifier. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve high MTTF. 3. Doubles for every 10oC of temperature increase. 4. +VS and -VS denote the positive and negative supply voltages of the output stage. 5. Rating applies if output current alternates between both output transistors at a rate faster than 60Hz.
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
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TYPICAL PERFORMANCE GRAPHS
PA79
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APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA79
GENERAL
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.apexmicrotech.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.
OPERATING CONSIDERATIONS
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +Vs and -Vs must be connected physically close to the pins to prevent local parasitic oscillation in the output stage of the PA79. Use electrolytic capacitors at least 1F. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1F or greater.
SUPPLY CURRENT
The PA79 features a class A/B driver stage to drive the output MOSFETs and an innovative input stage to achieve very high slew rates. The supply current drawn by the PA79, even with no load, varies with the slew rate of the output signal.
SPECIAL CONSIDERATIONS
Itisveryimportanttorealizethatinordertoachieve highfrequencyperformancetheheatsinktabhastobe tiedtoastable,lowimpedancereference,i.e.powersupplyorGND.AnACconnectionthrougha0.1Fcapacitor isalsosufficient.InternaltothePA79,theheatsinktab iselectricallyisolatedtomorethan350V.Thismayhelp allaysomeelectricalisolationconcernsintyingtheheat sinktoVsorGND.
HEATSINKING
TBD
STABILITY
CURRENT LIMIT
For proper operation, the current limit resistor, Rlim, must be connected as shown in the external connections diagram. For maximum reliability and protection, the resistor should be set as high as possible. The value of the resistor is calculated as follows, with Ilim in A; the maximum practical value is 1500. Rlim = 0.7 / Ilim
SAFE OPERATING AREA
The MOSFET output stage of the PA79 is not limited by second breakdown considerations as in bipolar output stages. However there are still three distinct limitations: 1. Voltage with stand capability of the transistors. 2. Current handling capability of the die metallization. 3. Temperature of the output MOSFETS. These limitations can be seen in the SOA (see Safe Operating Area graphs). Note that each pulse capability line shows a constant power level (unlike second breakdown limitations where power varies with voltage stress). These lines are shown for a case temperature of 25C and correspond to thermal resistances of TBDC/W for the PA79DK. Pulse stress levels for other case temperatures can be calculated in the same manner as DC power levels at different temperatures. The output stage is protected against transient fly back by the parasitic diodes of the output stage MOSFET structure. However, for protection against sustained high energy fly back external fast-recovery diodes must be used.
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The PA79 is externally compensated and performance can be tailored to the application. Use the graphs of small signal response and power response as a guide. Due to the innovative design of the PA79, two compensation networks are required. The values of these components should be the same to provide symmetric slew rate characteristics. The compensation capacitor Cc must be rated at 500V working voltage. NPO capacitors are recommended. The compensation networks CcRc must be mounted closely to the amplifier pins x & y and z & w to avoid spurious oscillation. The PA79 may require an external 33 pF capacitor (minimum breakdown of 350V) between Cc- and -Vs to prevent oscillations in the falling edge of the output. This capacitor is provided with the evaluation kit. Please refer to EK60U datasheet for details.
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This data sheet has been carefully checked and is believed to be reliable, SHANNON ROAD * is assumed ARIZONA 85741 * omissions. All specifications are subject 1 (800) 546-2739 APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH however, no responsibility TUCSON, for possible inaccuracies orUSA * APPLICATIONS HOTLINE: to change without notice.
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PA79U REV 2 FEBRUARY 2006 (c) 2006 Apex Microtechnology Corp.

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