PA162 PA162 P r o d u c t II nnnnoovvaa t i o n FFr roomm Power Operational Amplifiers FEATURES DESCRIPTION ♦ LOW COST ♦ WIDE BANDWIDTH - 1.1 Mhz ♦ HIGH OUTPUT CURRENT - 1.5A PER AMPLIFIER ♦ WIDE COMMON MODE RANGE Includes negative supply ♦ WIDE SUPPLY VOLTAGE RANGE Single supply: 5V to 40V Split supplies: ± 2.5V to ± 20V ♦ LOW QUIESCIENT CURRENT ♦ VERY LOW DISTORTION The amplifier design is a dual power op amp on a single monolithic die. The quad output PA162 combines two dual op amp die in a single PSOP package. This approach provides a cost-effective solution to applications where multiple amplifiers are required or a bridge configuration is needed. Four independent amplifiers coupled with low quiescent current and very low THD makes this an ideal lowdistortion 4-channel audio amplifier for applications such as laptops and computer speakers. APPLICATIONS The quad output PA162DK is available in a surface mount 20-pin PSOP, JEDEC MO-166-AB package. Built-in thermal shutdown allows the devices to selfprotect against thermal overloads. Care must be exercised to observe the Safe Operating Area (SOA) curve and proper heatsinking will ensure maximum reliability. ♦ HALF AND FULL BRIDGE MOTOR DRIVERS ♦ AUDIO POWER AMPLIFIER Stereo - 11.3W RMS per amplifier Bridge - 22.6W RMS per two amplifiers Two Bridges - 45.2W RMS per package ♦ 3 PHASE MOTOR DRIVER 3 Channels - 33.9W RMS per package ♦ IDEAL FOR SINGLE SUPPLY SYSTEMS 5V - Peripherals 12V - Automotive 28V - Avionic ♦ PACKAGING OPTIONS 20-Pin PSOP, JEDEC MO-166-AB (PA162DK) The wide common mode input range includes the negative rail, facilitating single supply applications. This makes it possible to have a ground-based input driving a single supply amplifier with ground acting as the second or bottom supply of the amplifier. +Vs I BIAS MONITOR -IN +IN OUT THERMAL PROTECT -Vs FIGURE 1. Equivalent schematic (one channel) Copyright © Cirrus Logic, Inc. 2009 PA162U (All Rights Reserved) http://www.cirrus.com JUL 2009 1 APEX - PA162UREVB PA162 P r o d u c t I n n o v a t i o nF r o m 1. Characteristics and Specifications Absolute Maximum Ratings Parameter Symbol Min Max Units 5 40 V POWER DISSIPATION, internal (1 amplifier) 15 W POWER DISSIPATION, internal (2 amplifiers)5 24 W POWER DISSIPATION, internal (3 amplifiers) 5 36 W POWER DISSIPATION, internal (4 amplifiers)5 45 W SUPPLY VOLTAGE, total OUTPUT CURRENT SOA INPUT VOLTAGE, differential -Vs +Vs INPUT VOLTAGE, common mode +Vs -Vs-.5V JUNCTION TEMPERATURE, max2 150 °C TEMPERATURE, pin solder - 10 secs max. 220 °C TEMP RANGE STORAGE -55 150 °C OPERATING TEMP RANGE, case2 -40 125 °C SPECIFICATIONS (per amplifier) Parameter Test Conditions2,3 Min Typ Max 1 15 Units INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature Full temp range 20 BIAS CURRENT, initial COMMON MODE RANGE 100 Full temp range COMMON MODE REJECTION, DC -Vs mV µV/°C 500 +Vs nA V 60 90 dB POWER SUPPLY REJECTION Full temp range 60 90 dB CHANNEL SEPARATION IOUT = 500mA, ƒ = 1kHz 50 68 dB INPUT NOISE VOLTAGE RS = 100Ω, ƒ = 1 to 100kHz 22 nV/√Hz 100 dB GAIN OPEN LOOP GAIN VO = ±10V, RL = 2.0KΩ 89 GAIN BANDWIDTH PRODUCT ƒ = 100kHz, CL = 100pF, RL = 2.0KΩ PHASE MARGIN Full temp range 65 °C POWER BANDWIDTH VO(P-P) = 28V 13.6 kHz 0.9 1.4 MHz OUTPUT CURRENT, peak CURRENT, continuous SLEW RATE 1.5 A 1 A 1.0 1.4 V/µS VOLTAGE SWING Full temp range, IO = 100mA |Vs| -1.1 |Vs| -0.8 V VOLTAGE SWING Full temp range, IO = 1A |Vs| -1.8 |Vs| -1.4 V HARMONIC DISTORTION AV = 1, RL = 50Ω, VO = .5VRMS, ƒ = 1kHz .02 % 2 PA162U PA162 P r o d u c t I n n o v a t i o nF r o m Parameter Test Conditions2,3 Min Typ Max Units 5 30 40 V CURRENT, quiescent +Vs (A/B) 8 10 mA CURRENT, quiescent +Vs (C/D) 8 10 mA CURRENT, quiescent total 16 20 mA POWER SUPPLY VOLTAGE, Vss4 THERMAL RESISTANCE, junction to case DC, 1 amplifier 7.16 7.87 °C/W 5 4.69 5.16 °C/W DC, 3 amplifiers5 3.08 3.39 °C/W DC, 4 amplifiers 2.51 2.77 °C/W DC, 2 amplifiers 5 AC, 1 amplifier 5.37 5.90 °C/W AC, 2 amplifiers5 3.52 3.87 °C/W AC, 3 amplifiers 5 2.31 2.54 °C/W AC, 4 amplifiers 5 1.89 2.07 25 RESISTANCE, junction to air7 °C/W °C/W NOTES: 1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken at typical supply voltages and TC = 25°C). 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve high MTTF. 3. Unless otherwise noted, the following conditions apply: ±VS = ±15V, T C =25°C. 4. +VS and -Vs denote the positive and negative rail respectively. VSS denotes total rail-to-rail supply. 5. Rating applies when power dissipation is equal in each of the amplifiers. Power and thermal ratings are based on two separate dual monolithic power op-amps on one integrated copper heatslug. Amplifiers A and B are combined on one monolithic die while amplifiers C and D are on the other. 6. If -Vs is disconnected before +Vs, a diode between -Vs and ground is recommended to avoid damage. 7. Rating applies when the heatslug of the DK package is soldered to a minimum of 1 square inch foil area of a printed circuit board. 1 20 A - + + B - NC -IN(A) +IN(A) +IN(B) -IN(B) -IN(C) +IN(C) +IN(D) -IN(D) NC - C + + D - 10 11 -VS OUT(A) +VS(A/B) OUT(B) -VS -VS OUT(C) +VS(C/D) OUT(D) -VS 20-pin PSOP PACKAGE STYLE DK FIGURE 2. External Connections. PA162U 3 PA162 P r o d u c t I n n o v a t i o nF r o m 40 8 0 4 -40 -80 2 10 8 4 6 AVERAGE QUIESCENT CURRENT, IQ (mA) 0 PHASE MARGIN vs. OUTPUT LOAD CAPACITANCE 55 GAIN, A (dB) PHASE MARGIN, Ф (°) 55 45 0 40 120 -40 80 CASE TEMPERATURE, TC (°C) 90 60 45 35 PULSE RESPONSE 10 40 100 20 110 0 120 -20 25 20 04 08 12 16 00 OUTPUT LOAD CAPACITANCE, CL (nF) 1 100 1K 10 FREQUENCY, ƒ (KHz) 130 10K VOS 3 2 1 0 2 0 40 80 120 -40 CASE TEMPERATURE, TC (°C) OUTPUT VOLTAGE SWING 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT, IO (A) PULSE RESPONSE 10 8 8 OUTPUT VOLTAGE, VO (V) OUTPUT VOLTAGE, VO (V) 65 VOLTAGE GAIN & PHASE vs. FREQUENCY 65 +VS = +15V AV = +1 VIN = 10Vp 6 4 2 0 -2 -VS = -15V RL = 20Ω fIN = 20kHz -4 -6 -8 -10 AVERAGE OFFSET VOLTAGE, VOS (mV) 12 BIAS CURRENT VOLTAGE DROP FROM SUPPLY, (V) 16 80 75 PHASE, Ф (°) 120 AVERAGE BIAS CURRENT, IB (mA) 20 CASE TEMPERATURE, TC (°C) TOTAL SUPPLY VOLTAGE, VS (V) QUIESCENT CURRENT 0 10 20 30 40 TIME, t (s) 50 60 70 +VS = +15V AV = +1 VIN = 10Vp 6 4 2 0 -2 -4 -6 -VS = -15V fIN = 1kHz -8 -10 0 200 400 600 800 1000 1200 1400 TIME, t (s) TYPICAL APPLICATION R1 and R2 set up Amplifier A as non-inverting. Amplifier B is set up as a unity gain inverter driven from the output of Amplifier A. Note that Amplifier B inverts the signals about the reference node, which is set at midsupply by R5 and R6. When the command input is midrange, so is the output of Amplifier A. Since this is also equivalent to the reference node voltage, the output of Amplifier B is the same resulting in 0V across the motor. Inputs more positive than 5V result in motor current flow from left to right (see Figure 3). Inputs less than 5V drive the motor in the opposite direction. R3 R2 R4 R1 INPUT 0-10V _ A 1/4 PA162 + M +28V _ B 1/4 PA162 R5 + R6 FIGURE 3. Bi-directional speed control from a single supply. 4 PA162U PA162 P r o d u c t I n n o v a t i o nF r o m TYPICAL APPLICATION (cont) The amplifiers are especially well-suited for applications such as this. The extended common mode range allows command inputs as low as 0V. The output swing lets it drive within 2V of the supply at an output of 1A. This means that a command input that ranges from 0 to 10V will drive a 24V motor from full scale CCW to full scale CW at ±1A. -Vs (pins 11, 15, 16 and 20) must be tied to the heatslug externally on the PCB. To ease metal routing on the PCB, run a direct trace from the -Vs pin to the center heat slug. The PA162 can be used in a three amplifier configuration for a three phase inverter or motor as shown in Figure 4. N o S PA162 Quad GENERAL Using 3 amplifiers from PA162 as 3 phase motor driver. Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heatsinking, FIGURE 4. 3 Phase Inverter mounting, SOA interpretation, and specification interpretation. Visit www.cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, heatsink selection; Apex Precision Power's complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. STABILITY CONSIDERATIONS 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. OUTPUT CURRENT FROM +VS OR -VS, (A) + 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) – C SN output stages with a mismatch in gain and phase response for different polarities of 0.01µF output current. It is difficult for the op amp manufacturer to optimize compensation for all operating conditions. For applications with load current exceeding 300mA, R SN oscillation may appear. The oscillation may occur only with the output voltage swing 10Ω at the negative or positive half cycle. Under most operating and load conditions acceptable stability can be achieved by providing a series RC snubber network connected from the output to ground (see Figure 5). The recommended component values of the of the network are, RSN = 10Ω and CSN = 0.01µF. Please refer to Ap- FIGURE 5. R-C Snubber plication Note 1 for further details. 10 DC, TC = 25°C DC, TC = 85°C 1 0.1 PA162U SOA 4 AMPLIFIERS LOADED 3 AMPLIFIERS LOADED 2 AMPLIFIERS LOADED 1 AMPLIFIER LOADED 1 10 50 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS - VO (V) 5 PA162 P r o d u c t I n n o v a t i o nF r o m THERMAL CONSIDERATIONS INTERNAL POWER DISSIPATION, P (W) POWER DERATING 50 The PA162DK has a large exposed integrated copper heat(A +B slug to which the monolithic is directly attached. The solder +C +D connection of the heatslug to a minimum of 1 square inch )A ( A 40 +B MP +C LIF foil area of the printed circuit board will result in thermal per)A IE MP RS LIF formance of 25°C/W junction to air rating of the PA162DK. LO IER 30 AD S Solder connection to an area of 1 to 2 square inches of foil LO ED (A+ A D B is required for minimal power applications. ED ) AM PLI FIE Where the PA162DK is used in higher power applications, it RS 20 LOA ( A ) DED A is necessary to use surface mount techniques of heatsinkMPLIF IER L O A ing. Surface mount techniques include the use of a surface DED 10 mount fan in combination with a surface mount heatsink on the backside of the FR4/ PC board with through hole thermal vias. Other highly thermal conductive substrate board 0 125 25 75 100 0 50 materials are available for maximum heat sinking. JUNCTION TEMPERATURE, T (°C) J The Power Derating graph assumes that the power dissipation is equal in each of the amplifiers. Power and thermal ratings are based on two separate dual monolithic power op amps on one integrated copper heat slug. Amps A and B are combined on one monolithic die while amps C and D are combined on the other. This multi chip configuration provides superior thermal performance by isolating each of the dual amplifiers. When loading either of the dual amplifiers it is possible to achieve better thermal performance by loading any combination of amplifiers (A or B) + (C or D). MOUNTING PRECAUTIONS 1. Always use a heat sink. Even unloaded the PA162DK can dissipate up to .8 watts. 2. Avoid bending the leads. Such action can lead to internal damage. Contacting Cirrus Logic Support For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact [email protected]. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. 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