PA98 APEX | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 5

Technical content

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

FEATURES

  • HIGH VOLTAGE — 450V (±225V)
  • HIGH SLEW RATE — 1000V/μS
  • HIGH OUTPUT CURRENT — 200mA

APPLICATIONS

  • HIGH VOLTAGE INSTRUMENTATION
  • PIEZO TRANSDUCER EXCITATION
  • PROGRAMMABLE POWER SUPPLIES UP TO 430V
  • ELECTROSTATIC TRANSDUCERS & DEFLECTION

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 appropri ate 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 reli ability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The Power SIP package is electri- cally isolated. EQUIVALENT SCHEMATIC 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 per haps 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. EXTERNAL CONNECTIONS PHASE COMPENSATION Gain C C R C 1 68pF 100Ω 20 10pF 330Ω 100 3.3pF 0Ω CC RATED FOR FULL SUPPLY VOLTAGE PATENTED 12-PIN SIP PACKAGE STYLE DP Formed leads available Package styles ED & EE

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA98 • PA98A 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 850°C to avoid generating toxic fumes. CAUTION ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 450V OUTPUT CURRENT, continuous within SOA 200mA POWER DISSIPATION, continuous @ TC = 25°C2 30W INPUT VOLTAGE, differential ±25V INPUT VOLTAGE, common mode ±VS TEMPERATURE, pin solder - 10s max. 260°C TEMPERATURE, junction2 150°C TEMPERATURE RANGE, storage –40 to +85°C OPERATING TEMPERATURE RANGE, case –25 to +85°C SPECIFICATIONS PA98 PA98A PARAMETER TEST CONDITIONS 1 MIN TYP MAX MIN TYP MAX UNITS INPUT OFFSET VOLTAGE, initial .5 2 .25 .5 mV OFFSET VOLTAGE, vs. temperature Full temperature range 10 30 5 10 µV/°C OFFSET VOLTAGE, vs. supply 3 10 * * µV/V OFFSET VOLTAGE, vs. time 75 * µV/kh BIAS CURRENT, initial3 5 50 3 10 pA BIAS CURRENT, vs. supply .01 * pA/V OFFSET CURRENT, initial3 10 100 3 30 pA INPUT IMPEDANCE, DC 10 11 * Ω INPUT CAPACITANCE 4 * pF COMMON MODE VOLTAGE RANGE4 ±VS–15 * V COMMON MODE REJECTION, DC V CM = ±90V 90 110 * * dB NOISE 100kHz BW, RS = 1KΩ, CC = 10pf 1 * µVrms GAIN OPEN LOOP, @ 15Hz R L = 2KΩ, CC = OPEN 96 111 * * dB GAIN BANDWIDTH PRODUCT at 1MHz R L = 2KΩ, CC = 3.3pf 100 * MHz POWER BANDWIDTH CC = 10pf 300 * kHz CC = 3.3pf 500 * kHz PHASE MARGIN Full temperature range 60 * ° OUTPUT VOLTAGE SWING4 IO = ±200mA ±Vs–10 ±Vs–6.5 * * V VOLTAGE SWING4 IO = ±75mA ±V–8.5 ±Vs–6.0 * * V VOLTAGE SWING4 IO = ±20mA ±V–8.0 ±Vs–5.5 * * V CURRENT, continuous TC = 85°C ±200 * mA SLEW RATE, AV = 20 CC = 10pf 400 * V/µs SLEW RATE, AV = 100 CC = OPEN 1000 700 * V/µs CAPACITIVE LOAD, AV = +1 Full temperature range 470 * * pf SETTLING TIME to .1% CC = 10pf, 2V step 1 * µs RESISTANCE, no load RCL = 0 50 * Ω POWER SUPPLY VOLTAGE6 Full temperature range ±15 ±150 ±225 * * * V CURRENT, quiescent 21 25 * * mA THERMAL RESISTANCE, AC, junction to case5 Full temperature range, F > 60Hz 2.5 * °C/W RESISTANCE, DC, junction to case Full temperature range, F < 60Hz 4.2 * °C/W RESISTANCE, junction to air Full temperature range 30 * °C/W TEMPERATURE RANGE, case Meets full range specifications –25 +85 * * °C NOTES: * The specification of PA98A is identical to the specification for PA98 in applicable column to the left. 1. Unless otherwise noted: T C = 25°C, compensation = CC = 68pF, RC = 100Ω. 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 10°C of temperature increase. 4. +V S 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 25°C case. No derating needed above 25°C case.

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com TYPICAL PERFORMANCE GRAPHSPA98 • PA98A

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 OPERATING CONSIDERATIONS PA98 • PA98A GENERAL Please read Application Note 1 "General Operating Consider- ations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpreta - tion. 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. 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 R CL = I LIM - .016 SAFE OPERATING AREA (SOA) The MOSFET output stage of this power operational ampli- fier 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 ad - ditional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external 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. 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 capaci tance 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. POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors are recom- mended 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. 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 • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. PA98U REV I DECEMBER 2004 © 2004 Apex Microtechnology Corp. OPERATING CONSIDERATIONSPA98 • 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 Design 1 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 (PD Q) by multiplying 0.025A by V SS (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 85°C or lower. Where: T C = maximum case temperature allowed T A = maximum ambient temperature encountered Calculate a heatsink rating which will maintain output transistor junctions at 150°C or lower. Where: T J = maximum junction temperature allowed. R ØJC = AC or DC thermal resistance from the specifica- tion table. Use the larger heatsink of these two calculations. Power Design is an Excel spreadsheet available free from www.apexmicrotech.com Tc - Ta RØSA = -0.1°C/WPD + PDQ TJ - Ta - (PD + PDQOUT) *RØJC RØSA = -0.1°C/WPD + PDQ