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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 * UP TO 23 WATT DISSIPATION CAPABILITY * OVER 200 kHz POWER BANDWIDTH
APPLICATIONS
* * * * PIEZOELECTRIC POSITIONING AND ACTUATION ELECTROSTATIC DEFLECTION DEFORMABLE MIRROR ACTUATORS CHEMICAL AND BIOLOGICAL STIMULATORS
20-PIN PSOP PACkAGE STYLE Dk TYPICAL APPLICATION
DESCRIPTION
The PA78 is a high voltage, high speed Precision IC power op amp with performance and unique features not found previously in any commercially available OpAmp . 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 PA78 is independent of supply current. However the slew rate is a strong function of input voltage amplitude. It should be noted that the package tab needs to be connected to a stable reference such as GND for high slew rates. Please refer to special considerations section for details. The output stages are well protected with user defined current limit although the Safe Operating Area (SOA) must be observed for reliable protection. Proper heatsinking is required for maintaining maximum reliability. External phase compensation provides the user with great flexibility in trading gain, stability and bandwidth.
EXTERNAL CONNECTIONS - Dk PACkAGE
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12-PIN SIP PACkAGE STYLE EU LEAD FORM EW
The PA78 is ideally suited to driving continuous drop ink jet systems, in both piezo actuation and deflection applications. The deflection amplifier shown above achieves accurate droplet displacement at high speeds to deposit crisp, clear lot code information on product containers. The external compensation networks have been optimized to match the gain of the circuit and the complex impedance of the load. The combination of high voltage and high speed allow repeatable low cost deflection of droplets for high production environments.
EXTERNAL CONNECTIONS - EU PACkAGE
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA78
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 TEST CONDITIONS1 MIN
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
350V 200mA, within SOA 23W 15V Vs 300 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 POWER SUPPLY 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
Package Tab Connected to GND 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 25 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
5.5 85
NOTES: 1. Unless otherwise noted: TC = 25C, 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 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
PA78
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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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PA78
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 PA78. Use electrolytic capacitors at least 1F. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1F or greater.
SUPPLY CURRENT
The PA78 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 PA78, even with no load, varies with the slew rate of the output signal.
SPECIAL CONSIDERATIONS
It is very important to realize that in order to achieve high frequency performance the heat sink tab has to be tied to a stable, low impedance reference, i.e. power supply or GND. An AC connection through a 0.1F capacitor is also sufficient. Internal to the PA78, the heatsink tab is electrically isolated to more than 350V . This may help allay some electrical isolation concerns in tying the heat sink to Vs or GND.
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 PA78 is not limited by second breakdown considerations as in bipolar output stages. Only thermal considerations and current handling capabilities limit the SOA. 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.
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The PA78 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 PA78, 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 PA78 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. PA78U REV 4 FEBRUARY 2006 (c) 2006 Apex Microtechnology Corp.

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