PA90

PA90 APEX | Alldatasheet

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Technical content

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

FEATURES

• HIGH VOLTAGE — 400V (±200V)
• LOW QUIESCENT CURRENT — 10mA
• HIGH OUTPUT CURRENT — 200mA
• PROGRAMMABLE CURRENT LIMIT
• HIGH SLEW RATE — 300V/µs

APPLICATIONS

• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS
• PROGRAMMABLE POWER SUPPLIES UP TO 390V

DESCRIPTION

The PA90 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 200mA and pulse currents up to 350mA. The safe operating area (SOA) has no second breakdown limitations and can be observed for all type loads by choosing an appropriate current limiting resistor. The MOSFET output stage is biased AB for linear operation. External com- pensation provides flexibility in choosing bandwidth and slew rate for the application. APEX’s Power SIP package uses a minimum of board space allowing for high density circuit boards. The 12-pin PowerSIP package is electrically isolated. EQUIVALENT SCHEMATIC TYPICAL APPLICATION LOW POWER, PIEZOELECTRIC POSITIONING Piezo positioning may be applied to the focusing of segment- ed mirror systems. The composite mirror may be composed of hundreds of elements, each requiring focusing under computer control. In such complex systems the PA90 reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increasing circuit density with the SIP package. PHASE COMPENSATION GAIN C C* R C ≥1 68pF 100Ω ≥5 10pF 100Ω ≥10 4.7pF 0Ω ≥30 NONE 0Ω *CC To be rated for the full supply voltage +V to –Vs. Use NPO ceramic (COG) type. EXTERNAL CONNECTIONS 12-PIN SIP PACKAGE STYLE DP Formed leads available with 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 ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 400V OUTPUT CURRENT, source, sink, peak 350mA, within SOA POWER DISSIPATION, continuous @ TC = 25°C 30W INPUT VOLTAGE, differential ±20V 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 PA90 SPECIFICATIONS PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE, initial .5 2 mV OFFSET VOLTAGE, vs. temperature Full temperature range 15 50 µV/°C OFFSET VOLTAGE, vs. supply 10 25 µV/V OFFSET VOLTAGE, vs. time 75 µV/kh BIAS CURRENT, initial 200 2000 pA BIAS CURRENT, vs. supply 4 pA/V OFFSET CURRENT, initial 50 500 pA INPUT IMPEDANCE, DC 1011 Ω INPUT CAPACITANCE 4 pF COMMON MODE VOLTAGE RANGE3 ±VS 15 V COMMON MODE REJECTION, DC V CM = ±90V 80 98 dB NOISE 100KHz BW, RS = 1KΩ, CC = OPEN 1 µVrms GAIN OPEN LOOP, @ 15Hz R L = 2KΩ, CC = OPEN 94 111 dB GAIN BANDWIDTH PRODUCT at 1MHz R L = 2KΩ, CC = OPEN 100 MHz POWER BANDWIDTH RL = 2KΩ, CC = OPEN 470 kHz PHASE MARGIN Full temperature range 60 ° OUTPUT VOLTAGE SWING3 IO = 200mA ±VS 12 ±V S 10 V CURRENT, continuous 200 mA SLEW RATE, AV = 100 CC = OPEN 240 300 V/µs CAPACITIVE LOAD, AV = +1 Full temperature range 470 pF SETTLING TIME to .1% CC = OPEN, 2V step 1 µs RESISTANCE, no load 50 Ω POWER SUPPLY VOLTAGE5 See note 5 ±40 ±150 ±200 V CURRENT, quiescent, 10 14 mA THERMAL RESISTANCE, AC, junction to case4 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: 1. Unless otherwise noted: T C = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100 CC = 68pF. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. 3. +V S and –VS denote the positive and negative power supply rail respectively. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case. CAUTION The PA90 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. ± ±

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com TYPICAL PERFORMANCE GRAPHSPA90

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 OPERATING CONSIDERATIONS PA90 GENERAL Please read Application Note 1 "General Operating Con - siderations" 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. CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. 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 32 ohms. .65 R CL = I LIM 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 addi- tional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external load. INPUT PROTECTION Although the PA90 can withstand differential voltages up to ±20V, additional external protection is recommended. Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differ ential 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. See Figure 2. 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 sup ply 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 PA90 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 4 and 5 to avoid spurious oscillation. QUIESCENT CURRENT REDUCTION When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of the output stage is disabled. This raises distortion since the output stage is then class C biased, but reduces the quiescent current by 1mA for a power dissipation savings of 0.4W. Pin 3 may be left open if not used. 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. PA90U REV H OCTOBER 2004 © 2004 Apex Microtechnology Corp.