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FEATURES
* * * * WIDE SUPPLY RANGE -- 10 to 40V HIGH OUTPUT CURRENT -- 10A Peak CLASS "C" OUTPUT -- Low Cost LOW QUIESCENT CURRENT -- 2.6mA
APPLICATIONS
* * * * DC SERVO AMPLIFIER MOTOR/SYNCHRO DRIVER VALVE AND ACTUATOR CONTROL DC OR AC POWER REGULATOR
8-PIN TO-3 PACKAGE STYLE CE TYPICAL APPLICATION
DESCRIPTION
The PA51 and PA51A are high voltage, high output current operational amplifiers designed to drive resistive, inductive and capacitive loads. Their complementary common emitter output stage is the simple class C type optimized for low frequency applications where crossover distortion is not critical. These amplifiers are not recommended for audio, transducer or deflection coil drive circuits. The safe operating area (SOA) is fully specified and can be observed for all operating conditions by selection of user programmable current limiting resistors. Both amplifiers are internally compensated for all gain settings. For continuous operation under load, mounting on a heatsink of proper rating is recommended. Do not use isolation washers! This hybrid integrated circuit utilizes thick film conductors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3 package is electrically isolated and hermetically sealed. The use of compressible thermal washers and/or improper mounting torque will void the product warranty. Please see "General Operating Considerations".

The linear relationship of torque output to current input of the modern torque motor makes this simple control circuit ideal for many material processing and testing applications. The sense resistor develops a feedback voltage proportional to motor current and the small signal properties of the Power Op Amp insure accuracy. With this closed loop operation, temperature induced impedance variations of the motor winding are automatically compensated.
EXTERNAL CONNECTIONS

EQUIVALENT SCHEMATIC

APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
PA51 * PA51A
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, junction1 TEMPERATURE, pin solder -10s TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case PA51 TYP 5 10 35 20 15 .05 .02 12 .05 250 10 3 VS-3 110 115 1 16 45 VS-5 VS-4 2 2.6 80V 10A 97W VS -3V VS 200C 300C -65 to +150C -55 to +125C PA51A TYP 2 * * * * * * 5 * * * * * * * * * * * * * *
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. power BIAS CURRENT, initial BIAS CURRENT, vs. temperature BIAS CURRENT, vs. supply OFFSET CURRENT, initial OFFSET CURRENT, vs. temperature INPUT IMPEDANCE, common mode INPUT IMPEDANCE, differential INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE3 COMMON MODE REJECTION, DC3 GAIN OPEN LOOP GAIN at 10Hz GAIN BANDWIDTH PRODUCT @ 1MHz POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING3 VOLTAGE SWING3 VOLTAGE SWING3 CURRENT SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD, unity gain CAPACITIVE LOAD, gain > 4 POWER SUPPLY VOLTAGE CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case4 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case TEST CONDITIONS 2, 5 TC = 25C Full temperature range TC = 25C TC = 25C TC = 25C Full temperature range TC = 25C TC = 25C Full temperature range TC = 25C TC = 25C TC = 25C Full temperature range TC = 25C, VCM = VS -6V Full temp. range, full load TC = 25C, full load TC = 25C, IO = 8A, VO = 40VPP Full temperature range TC = 25C, IO = 10A Full temp. range, IO = 4A Full temp. range, IO = 68mA TC = 25C TC = 25C, 2V step TC = 25C, RL = 6 Full temperature range Full temperature range Full temperature range TC = 25C F > 60Hz F < 60Hz Meets full range specifications -25 MIN
MAX 10 65 40 30
MIN
MAX 5 40 20 10
UNITS mV V/C V/V V/W nA nA/C nA/V nA nA/C M M pF V dB dB MHz kHz V V V A s V/s nF
VS-6 70 94 10
* 80 * *
VS-8 VS-6 VS-6 10 1.0
* * * * 1.5 SOA 36 10 1.2 1.8 +85 -55 *
* * 40 * * * +125
10
28 2.6 1.0 1.5 30
*
34 * * * *
V mA C/W C/W C/W C
NOTES: * The specification of PA51A is identical to the specification for PA51 in applicable column to the left. 1. Lo achieve high MTTF. 2. The power supply voltage specified under the TYP rating applies unless otherwise noted as a test condition. 3. +VS and -VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to -VS. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Full temperature range specifications are guaranteed but not 100% tested.
CAUTION
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The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, 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
PA51 * PA51A
TYPICAL PERFORMANCE GRAPHS

APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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OPERATING CONSIDERATIONS
PA51 * PA51A
1. Under transient conditions, capacitive and dynamic* inductive loads up to the following maximums are safe: VS 40V 35V 30V 25V 20V 15V CAPACITIVE LOAD ILIM = 5A ILIM = 10A 400F 200F 800F 400F 1,600F 800F 5.0mF 2.5mF 10mF 5.0mF 20mF 10mF INDUCTIVE LOAD ILIM = 5A ILIM = 10A 11mH 4.3mH 20mH 5.0mH 35mH 6.2mH 50mH 15mH 400mH 20mH ** 100mH
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 and heat sink selection. The "Application Notes" and "Technical Seminar" sections contain a wealth of information on specific types of applications. Package outlines, heat sinks, mounting hardware and other accessories are located in the "Packages and Accessories" section. Evaluation Kits are available for most Apex product models, consult the "Evaluation Kit" section for details. For the most current version of all Apex product data sheets, visit www.apexmicrotech.com.
SAFE OPERATING AREA (SOA)
The output stage of most power amplifiers has three distinct limitations: 1. The current handling capability of the transistor geometry and the wire bonds. 2. The second breakdown effect which occurs whenever the simultaneous collector current and collector-emitter voltage exceeds specified limits. 3. The junction temperature of the output transistors.
* If the inductive load is driven near steady state conditions, allowing the output voltage to drop more than 8V below the supply rail with ILIM = 10A or 15V below the supply rail with ILIM = 5A while the amplifier is current limiting, the inductor should be capacitively coupled or the current limit must be lowered to meet SOA criteria. ** Second breakdown effect imposes no limitation but thermal limitations must still be observed. 2. The amplifier can handle any EMF generating or reactive load and short circuits to the supply rail or shorts to common if the current limits are set as follows at TC = 85C. VS 45V 40V 35V 30V 25V 20V 15V SHORT TO VS C, L, OR EMF LOAD 0.1A 0.2A 0.3A 0.5A 1.2A 1.5A 2.0A SHORT TO COMMON 1.3A 1.5A 1.6A 2.0A 2.4A 3.0A 4.0A

The SOA curves combine the effect of of all limits for this Power Op Amp. For a given application, the direction and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is simple for resistive loads but more complex for reactive and EMF generating loads. The following guidelines may save extensive analytical efforts.
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.
These simplified limits may be exceeded with further analysis using the operating conditions for a specific application. 3.The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used.

CURRENT LIMIT
Proper operation requires the use of two current limit resistors, connected as shown in the external connection diagram. The minimum value for RCL is .06 ohm, however for optimum reliability it should be set as high as possible. Refer to the "General Operating Considerations" section of the handbook for current limit adjust details.
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PA51U REV N MARCH 2005 (c) 2005 Apex Microtechnology Corp.

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