DUAL POWER OPERATIONAL AMPLIFIERS PA35 HTTP://WWW.APEXMICROTECH.COM M I C R O T E C H N O L O G Y (800) 546-APEX (800) 546-2739 FEATURES • LOW COST • WIDE COMMON MODE RANGE — Includes negative supply • WIDE SUPPLY VOLTAGE RANGE Single supply: 5V to 40V Split supplies: ±2.5V to ±20V • HIGH EFFICIENCY — |Vs–1.4V| at 1.0A typ • HIGH OUTPUT CURRENT — 1.7A min • INTERNAL CURRENT LIMIT • LOW DISTORTION APPLICATIONS • HALF & FULL BRIDGE MOTOR DRIVERS • AUDIO POWER AMPLIFIER • IDEAL FOR SINGLE SUPPLY SYSTEMS 5V — Peripherals 12V — Automotive 28V — Avionic EXTERNAL CONNECTIONS PA35 DESCRIPTION B + -IN AMP A 4 5 -VS 3 - IN AMP B 2 +IN AMP A OUT AMP A 1 + 6 7 +VS A - OUT AMP B The PA35 consists of a monolithic power op amp with a unity gain buffer in a 7-pin TO220 package. The 7-pin TO220 flat back heat tab allows for heat sinking with an electrically insulating thermal washer. The tab of the 7-pin TO220 plastic package is tied to -Vs. Combining the power amp and the unity gain buffer in a parallel connection yields a single 3.4A amplifier. The wide common mode input range includes the negative rail, facilitating single supply applications. It is possible to have a "ground based" input driving a single supply amplifier with ground acting as the "second" or "bottom" supply of the amplifier. The Safe Operating Area (SOA) must be observed when determining the effect of all limits for the PA35 power op amp. Proper heat sinking is required for maximum reliability and performance. EQUIVALENT SCHEMATIC TYPICAL CIRCUIT RI RF PARALLEL CONNECTION yields a single 3.4A amplifier +VS 1/2 PA35 A 1Ω +VS RS .2Ω VO 2I I .1µF VIN +IN – IN OUT LOAD 1/2 PA35 B 1Ω –VS RS .2Ω – VS I SUB .1µF CHANNEL A CHANNEL B NOTE: INTERNAL BONDING REPRESENTED BY DASHED LINE APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] PA35 ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, total OUTPUT CURRENT POWER DISSIPATION, internal, (per amplifier) POWER DISSIPATION, internal (both amplifiers) INPUT VOLTAGE, differential INPUT VOLTAGE, common mode JUNCTION TEMPERATURE, max1 TEMPERATURE, pin solder—10 sec max TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case PA35 SPECIFICATIONS TEST CONDITIONS 2 PARAMETER 5V to 40V 1.7A 18.5W 27.5W ±VS +VS, -VS–.5V 150°C 300°C –65°C to 150°C –55°C to 125°C MIN TYP MAX UNITS 1.5 15 1000 10 mV µV/°C INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature BIAS CURRENT, initial COMMON MODE RANGE COMMON MODE REJECTION, DC POWER SUPPLY REJECTION Full temperature range Full temperature range Full temperature range Full temperature range 35 –VS–.3 60 60 nA +VS–2 85 80 dB dB dB 100 600 65 13.6 dB kHz ° kHz 1.2 .22 |VS| –0.8 A V/µs µF V GAIN OPEN LOOP GAIN GAIN BANDWIDTH PRODUCT PHASE MARGIN POWER BANDWIDTH Full temperature range AV = 40dB Full temperature range VO(P-P) = 28V 80 OUTPUT CURRENT, peak SLEW RATE CAPACITIVE LOAD DRIVE VOLTAGE SWING 1.7 .5 AV = 1 Full temp. range, IO = 100mA |VS| –1.0 POWER SUPPLY VOLTAGE, VSS3 CURRENT, quiescent, total 54 30 45 5.44 4.07 3.64 2.73 6.80 5.10 4.55 3.41 40 90 V mA THERMAL RESISTANCE,DC junction to case (single) RESISTANCE,AC junction to case (single) RESISTANCE,DC junction to case (both) RESISTANCE,AC junction to case (both) RESISTANCE,junction to air TEMPERATURE RANGE,case Meets full range specifications –25 °C/W °C/W 60 85 °C/W °C NOTES: 1. 2. 3. 4. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. Unless otherwise noted, the following conditions apply: ±VS = ±15V, TC = 25°C. +VS and –VS denote the positive and negative supply rail respectively. VSS denotes the total rail-to-rail supply voltage. Current limit may not function properly below VSS = 6V, however SOA violations are unlikely in this area. APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 PA35 25 BOTH Amplifiers 20 15 EACH Amplifier 10 5 0 100 0 25 50 75 125 JUNCTION TEMPERATURE, Tj (°C) 1.5 1.25 1.0 .75 .5 .25 –50 –25 0 25 50 75 100 125 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE –60 60 PHASE, ϕ (°) 40 20 0 –90 –120 –150 –180 –20 1 10 100 1K 10K 100K 1M FREQUENCY, F (Hz) –210 0 POWER SUPPLY REJECTION 10 100 1K 10K .1M FREQUENCY, F (Hz) PULSE RESPONSE 89 OUTPUT VOLTAGE, VO (V) 83 80 77 74 71 5 0 –5 69 66 63 60 AV = 1 R L =10 Ω 10 86 1M VOLTAGE DROP FROM SUPPLY, (V) OPEN LOOP GAIN, A (dB) –30 80 –10 0 10 100 1K 10K 100K 1M FREQUENCY, F (Hz) 0 200 400 600 TIME, t (µs) 800 40 30 25 20 15 10 |+VS | + |–VS | = 40V 5 1K PHASE RESPONSE 0 100 POWER SUPPLY REJECTION, PSR (dB) 50 OUTPUT VOLTAGE, VO (VPP ) 30 POWER RESPONSE BIAS CURRENT 1.75 NORMALIZED CURRENT LIMIT, I LIM (A) POWER DERATING NORMALIZED BIAS CURRENT, I B (X) INTERNAL POWER DISSIPATION, P(W) TYPICAL PERFORMANCE GRAPHS 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT 1.6 1.4 1.2 1.0 .8 .6 .4 25 50 75 100 125 –50 –25 0 CASE TEMPERATURE, TC (°C) OUTPUT VOLTAGE SWING 3.5 3 2.5 2 1.5 1 .5 0 0 .5 1 1.5 2 2.5 3 OUTPUT CURRENT, I (A) 3.5 1 AV = –10 V OUT = 16VPP RL = 8Ω .1 .01 .001 10 100 1K 10K 40K FREQUENCY, F (Hz) TOTAL SUPPLY VOLTAGE, VSS (V) 3 QUIESCENT CURRENT 40 125 35 100 30 75 25 50 20 25 15 0 10 –25 CASE TEMPERATURE, TC (°C) TOTAL HARMONIC DISTORTION, THD (%) O HARMONIC DISTORTION 5 –50 .7 .8 .9 1 1.1 1.2 1.3 1.4 NORMALIZED QUIESCENT CURRENT, I Q (X) APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] OPERATING CONSIDERATIONS PA35 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. CURRENT LIMIT OUTPUT CURRENT FROM +V OR –V (A) S S Current limit is internal to the amplifier, the typical value is shown in the current limit specification. 5 4 3 allowing the output voltage to drop more than 6V below the supply rail while the amplifier is current limiting, the inductor should be capacitively coupled or the supply voltage must be lowered to meet SOA criteria. NOTE: For protection against sustained, high energy flyback, external fast-recovery diodes should be used. MONOLITHIC AMPLIFIER STABILITY CONSIDERATIONS All monolithic power op amps use output stage topologies that present special stability problems. This is primarily due to non-complementary (both devices are NPN) output stages with a mismatch in gain and phase response for different polarities of output current. It is difficult for the op amp manufacturer to optimize compensation for all operating conditions. The recommended R-C network of 1 ohm in series with 0.1µF from output to AC common (ground or a supply rail, with adequate bypass capacitors) will prevent local output stage oscillations. The amplifiers are internally compensated for unity gain stability, no additional compensation is required. THERMAL CONSIDERATIONS 2 DC ,TC 1 =2 5°C DC ,TC =8 5°C The PA35 may require a thermal washer which is electrically insulating since the tab is tied to –VS. This can result in thermal impedances for R θCS of up to 1°C/W or greater. VBIAS should be set midway between +Vs and -Vs, Vref is usually ground in dual supply systems or used for level translation in single supply systems. MOUNTING PRECAUTIONS .1 1 2 3 4 5 6 7 8 9 10 20 30 40 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE V S –VO (V) SAFE OPERATING AREA (SOA) The SOA curves combine the effect 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. Under transient conditions, capacitive and dynamic* inductive loads up to the following maximum are safe: ±Vs CAPACITIVE LOAD INDUCTIVE LOAD 20V 15V 10V 5V 200µF 500µF 5mF 50mF 7.5mH 25mH 35mH 150mH 1. Always use a heat sink. Even unloaded, the PA35 can dissipate up to 3.6 watts. An insulating thermal washer should always be used. 2. Avoid bending the leads. Such action can lead to internal damage. 3. Always fasten the tab to the heat sink before the leads are soldered to fixed terminals. 4. Strain relief must be provided if there is any probability of axial stress to the leads. * If the inductive load is driven near steady state conditions, This data sheet has been carefully checked and is believed to be reliable, however, no responsibility assumed forARIZONA possible inaccuracies All specifications are subject to change without notice. APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD •is TUCSON, 85741 or• omissions. USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 PA35U REV. A MARCH 2001 © 2001 Apex Microtechnology Corp.