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FEATURES
* HIGH VOLTAGE -- 450V (225V) * HIGH SLEW RATE -- 1000V/S * HIGH OUTPUT CURRENT -- 200mA
APPLICATIONS
* * * * HIGH VOLTAGE INSTRUMENTATION PIEZO TRANSDUCER EXCITATION PROGRAMMABLE POWER SUPPLIES UP TO 430V ELECTROSTATIC TRANSDUCERS & DEFLECTION
PATENTED
12-PIN SIP PACKAGE STYLE DP
Formed leads available Package styles ED & EE
DESCRIPTION
The PA98 is a high voltage, high power bandwidth MOSFET operational amplifier designed for output currents up to 200mA. Output voltages can swing up to 215V with a dual supply and up to +440 volts with a single supply. The safe operating area (SOA) has no second breakdown limitations and can be observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with a cascode input circuit configuration. All internal biasing is referenced to a bootstrapped zener-MOSFET current source. As a result, the PA98 features an unprecedented supply range and excellent supply rejection. The MOSFET output stage is biased on for linear operation. External compensation provides user flexibility. This hybrid circuit utilizes thick film (cermet) resistors, ceramic capacitors and silicon semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The Power SIP package is electrically isolated.
TYPICAL APPLICATION

DYNAMIC FOCUSING Dynamic focusing is the active correction of focusing voltage as a beam traverses the face of a CRT. This is necessary in high resolution flat face monitors since the distance between cathode and screen varies as the beam moves from the center of the screen to the edges. PA98 lends itself well to this function since it can be connected as a summing amplifier with inputs from the nominal focus potential and the dynamic correction. The nominal might be derived from a potentiometer, or perhaps automatic focusing circuitry might be used to generate this potential. The dynamic correction is generated from the sweep voltages by calculating the distance of the beam from the center of the display.
EQUIVALENT SCHEMATIC

EXTERNAL CONNECTIONS

PHASE COMPENSATION
Gain 1 20 100 CC 68pF 10pF 3.3pF RC 100 330 0
CC RATED FOR FULL SUPPLY VOLTAGE
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ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
PA98 * PA98A
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, continuous within SOA POWER DISSIPATION, continuous @ TC = 25C2 INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max. TEMPERATURE, junction2 TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case TEST CONDITIONS 1 MIN PA98 TYP .5 10 3 75 5 .01 10 1011 4 110 1 111 100 300 500 60 MAX 2 30 10 50 100 * * 450V 200mA 30W 25V VS 260C 150C -40 to +85C -25 to +85C MIN PA98A TYP .25 5 * * 3 * 3 * * * * * * * * * * * * * * * * * * * MAX .5 10 * 10 30 UNITS mV V/C V/V V/kh pA pA/V pA pF V dB Vrms dB MHz kHz kHz V V V mA V/s V/s pf s V mA C/W C/W C/W C
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial3 BIAS CURRENT, vs. supply OFFSET CURRENT, initial3 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE4 COMMON MODE REJECTION, DC NOISE
Full temperature range
VCM = 90V 100kHz BW, RS = 1K, CC = 10pf
VS-15 90
GAIN OPEN LOOP, @ 15Hz RL = 2K, CC = OPEN GAIN BANDWIDTH PRODUCT at 1MHz RL = 2K, CC = 3.3pf POWER BANDWIDTH CC = 10pf CC = 3.3pf PHASE MARGIN Full temperature range OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, continuous SLEW RATE, AV = 20 SLEW RATE, AV = 100 CAPACITIVE LOAD, AV = +1 SETTLING TIME to .1% RESISTANCE, no load POWER SUPPLY VOLTAGE6 CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case IO = 200mA IO = 75mA IO = 20mA TC = 85C CC = 10pf CC = OPEN Full temperature range CC = 10pf, 2V step RCL = 0 Full temperature range
96
*
Vs-10 Vs-6.5 V-8.5 Vs-6.0 V-8.0 Vs-5.5 200 400 1000 470 1 50 15 150 21 225 25 2.5 4.2 +85
* * * 700 *
*
*
* * * * *
Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range specifications
-25
30
*
*
NOTES: * The specification of PA98A is identical to the specification for PA98 in applicable column to the left. 1. Unless otherwise noted: TC = 25C, compensation = CC = 68pF, RC = 100. 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 MTTF. Ratings apply only to output transistors. An additional 10W may be dissipated due to quiescent power. 3. Doubles for every 10C of temperature increase. 4. +VS and -VS denote the positive and negative power supply rail respectively. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 6. Derate max supply rating .625 V/C below 25C case. No derating needed above 25C case.
CAUTION
The PA98 is constructed from MOSFET transistors. ESD handling procedures must be observed. The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
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PA98 * PA98A

TYPICAL PERFORMANCE GRAPHS

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OPERATING CONSIDERATIONS
PA98 * PA98A
load. This is not the same as the absolute maximum internal power dissipation listed elsewhere in the specification since the quiescent power dissipation is significant compared to the total.
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.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.
INPUT PROTECTION
Although the PA98 can withstand differential voltages up to 25V, additional external protection is recommended. Since the PA98 is a high speed amplifier, low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 1). The differential input voltage will be clamped to 1.4V. This is sufficient overdrive to produce maximum power bandwidth.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. The minimum value is 1.4 ohm, however for optimum reliability the resistor value should be set as high as possible. The value is calculated as follows; with the maximum practical value of 30 ohms. .7 RCL = ILIM - .016
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 reversals 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 transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction temperature of the output MOSFETs. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used.
SAFE OPERATING CURVES
The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external
STABILITY
The PA98 is externally compensated and performance can be tailored to the application. Use the graphs of small signal response and power response as a guide. The compensation capacitor CC must be rated at 500V working voltage. An NPO capacitor is recommended. The compensation network CCRC must be mounted closely to the amplifier pins 7 and 8 to avoid spurious oscillation.

APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
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PA98 * PA98A
INTERNAL POWER DISSIPATION AND HEATSINK SELECTION
With the unique combination of high voltage and speed of the PA98, traditional formulas for heatsink selection will falsely lower the apparent power handling capability of this amplifier. To more accurately predict operating temperatures use Power Design1 revision 10 or higher, or use the following procedure: Find internal dissipation (PD) resulting from driving the load. Use Power Design or refer to Apex Applications Note 1, General Operating Considertaions, paragraph 7. Find total quiescent power (PDQ) by multiplying 0.025A by VSS (total supply voltage). Find output stage quiescent power (PDQOUT) by multiplying 0.001 by VSS. Calculate a heatsink rating which will maintain the case at 85C or lower.
Tc - Ta -0.1C/W PD + PDQ
OPERATING CONSIDERATIONS
ROSA =
Where: TC = maximum case temperature allowed TA = maximum ambient temperature encountered Calculate a heatsink rating which will maintain output transistor junctions at 150C or lower.
ROSA = TJ - Ta - (PD + PDQOUT) *ROJC -0.1C/W PD + PDQ
Where: TJ = maximum junction temperature allowed. ROJC= AC or DC thermal resistance from the specification table. Use the larger heatsink of these two calculations. Power Design is an Excel spreadsheet available free from www.apexmicrotech.com
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible ORDERS or omissions. All specifications prodlit@apexmicrotech.com APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 *inaccuracies(520) 690-8601 * EMAILare subject to change without notice. PA98U REV I DECEMBER 2004 (c) 2004 Apex Microtechnology Corp.
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