pa162 pa162u 1 pa162 features ? 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 quiescent current ? very low distortion applications ? half and full bridge motor drivers ? audio power amplifier stereo - 11.3w rms per amplifer bridge - 22.6w rms per two amplifers 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) description the amplifer design is a dual power op amp on a single monolithic die. the quad output pa162 com - bines two dual op amp die in a single psop pack - age. this approach provides a cost-effective solu - tion to applications where multiple amplifers are required or a bridge confguration is needed. four independent amplifers coupled with low quiescent current and very low thd makes this an ideal low- distortion 4-channel audio amplifer for applications such as laptops and computer speakers. 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 self- protect against thermal overloads. care must be ex - ercised to observe the safe operating area (soa) curve and proper heatsinking will ensure maximum reliability. 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 amplifer with ground acting as the second or bottom supply of the amplifer. power operational amplifiers pa162 p r o d u c t i n n o v a t i o n f r o m out +vs -in +in -vs i bias monitor thermal protect figure 1. equivalent schematic (one channel) copyright ? cirrus logic, inc. 2009 (all rights reserved) www.cirrus.com aug 2010 apex - pa162urevc p r o d u c t i n n o v a t i o n f r o m
pa162 2 pa162u parameter test conditions 2,3 min typ max units input offset voltage, initial 1 15 mv offset voltage, vs. temperature full temp range 20 v/c bias current, initial 100 500 na common mode range full temp range -vs +vs v common mode rejection, dc 60 90 db power supply rejection full temp range 60 90 db channel separation i out = 500ma, ? = 1khz 50 68 db input noise voltage r s = 100, ? = 1 to 100khz 22 nv/hz gain open loop gain v o = 10v, r l = 2.0k 89 100 db gain bandwidth product ? = 100khz, c l = 100pf, r l = 2.0k 0.9 1.4 mhz phase margin full temp range 65 c power bandwidth v o (p-p) = 28v 13.6 khz output current, peak 1.5 a current, continuous 1 a slew rate 1.0 1.4 v/s voltage swing full temp range, i o = 100ma |vs| -1.1 |vs| -0.8 v voltage swing full temp range, i o = 1a |vs| -1.8 |vs| -1.4 v harmonic distortion a v = 1, r l = 50, v o = .5vrms, ? = 1khz .02 % parameter symbol min max units supply voltage, total 5 40 v output current soa power dissipation, internal (1 amplifer) 15 w power dissipation, internal (2 amplifers) 5 24 w power dissipation, internal (3 amplifers) 5 36 w power dissipation, internal (4 amplifers) 5 45 w input voltage, differential -vs +vs input voltage, common mode +vs -vs-.5v junction temperature, max 2 150 c temperature, pin solder - 10 secs max. 220 c temp range storage -55 150 c operating temp range, case 2 -40 125 c 1. characteristics and specifications absolute maximum ratings specifications (per amplifier) p r o d u c t i n n o v a t i o n f r o m
pa162 pa162u 3 parameter test conditions 2,3 min typ max units power supply voltage, vss 4 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 thermal resistance, junction to case dc, 1 amplifer 7.16 7.87 c/w dc, 2 amplifers 5 4.69 5.16 c/w dc, 3 amplifers 5 3.08 3.39 c/w dc, 4 amplifers 5 2.51 2.77 c/w ac, 1 amplifer 5.37 5.90 c/w ac, 2 amplifers 5 3.52 3.87 c/w ac, 3 amplifers 5 2.31 2.54 c/w ac, 4 amplifers 5 1.89 2.07 c/w resistance, junction to air 7 25 c/w notes: 1. (all min/max characteristics and specifcations are guaranteed over the specifed operating condi - tions. typical performance characteristics and specifcations are derived from measurements taken at typical supply voltages and t c = 25c). 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: v s = 15v, t c =25c. 4. +v s and -v s denote the positive and negative rail respectively. v ss denotes total rail-to-rail supply. 5. rating applies when power dissipation is equal in each of the amplifers. power and thermal ratings are based on two separate dual monolithic power op-amps on one integrated copper heatslug. amplifers a and b are combined on one monolithic die while amplifers c and d are on the other. 6. if -v s is disconnected before +v s , a diode between -v s and ground is recommended to avoid dam - age. 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. 20-pin psop package style dk nc -in(a) +in(a) +in(b) -in(b) -in(c) +in(c) +in(d) -in(d) nc -vs out(a) +vs(a/b) out(b) -vs -vs out(c) +vs(c/d) out(d) -vs a + - 1 10 20 11 b + - - + + - c d figure 2. external connections. p r o d u c t i n n o v a t i o n f r o m
pa162 4 pa162u -40 0 40 80 120 45 55 65 75 case temperature, t c (c) average bias current, i b (ma) bias current -40 0 40 80 120 0 1 2 3 case temperature, t c (c) average offset voltage, v os (mv) vos 00 04 08 12 16 35 45 55 65 output load capacitance, c l (nf) phase margin, () phase margin vs. output load capacitance 20 25 0 -20 20 40 60 1 10 100 1k 10k 90 100 110 120 130 voltage gain & phase vs. frequency frequency, ? (khz) gain, a (db) phase, () pulse response time, t (s) output voltage, v o (v) 0 10 20 30 40 50 -4 8 4 0 -8 -2 10 6 2 -6 -10 60 70 +v s = +15v a v = +1 v in = 10vp -v s = -15v r l = 20? f in = 20khz pulse response time, t (s) output voltage, v o (v) 0 200 400 600 800 1000 0 1200 1400 +v s = +15v a v = +1 v in = 10vp -v s = -15v f in = 1khz quiescent current 2 4 6 8 10 average quiescent current, i q (ma) total supply voltage, v s (v) 20 16 12 0 4 8 -80 -40 0 40 80 120 case temperature, t c (c) output voltage swing output current, i o (a) voltage drop from supply, (v) 0.1 0.2 0.3 0.4 0.5 0.6 0.6 1.8 1.4 1 0.2 0.8 2 1.6 1.2 0.4 0 0.7 1.0 0.9 0.8 -4 8 4 -8 -2 10 6 2 -6 -10 typical application r1 and r2 set up amplifer a as non-inverting. ampli - fer b is set up as a unity gain inverter driven from the output of amplifer a. note that amplifer b inverts the signals about the reference node, which is set at mid- supply by r5 and r6. when the command input is midrange, so is the output of amplifer a. since this is also equivalent to the reference node voltage, the out - put of amplifer b is the same resulting in 0v across the motor. inputs more positive than 5v result in motor current fow from left to right (see figure 3). inputs less than 5v drive the motor in the opposite direction. input 0-10v a m b r2 r3 r4 r5 r6 r1 1/4 pa162 1/4 pa162 +28v + _ + _ figure 3. bi-directional speed control from a single supply. typical performance graphs p r o d u c t i n n o v a t i o n f r o m
pa162 pa162u 5 typical application (cont) the amplifers 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 amplifer confguration for a three phase inverter or motor as shown in figure 4. general please read application note 1 "general operating con - siderations" which covers stability, supplies, heatsinking, mounting, soa interpretation, and specifcation interpre - tation. 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 semi - nar workbook; and evaluation kits. stability considerations all monolithic power op amps use output stage topologies that present special sta - bility 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 diffcult for the op amp manufacturer to optimize compensation for all operating conditions. for applications with load current exceeding 300ma, oscillation may appear. the oscillation may occur only with the output voltage swing 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 network are, r sn = 10 and c sn = 0.01f. please refer to application note 1 for further details. 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. supply to output differential voltage, v s - v o (v) output current from +v s or -v s , (a) soa 4 amplifiers loaded 1 amplifier loaded 2 amplifiers loaded 3 amplifiers loaded dc, t c = 25c dc, t c = 85c 1 50 10 0.1 10 1 n o s pa162 quad using 3 amplifiers from pa162 as 3 phase motor driver. figure 4. 3 phase inverter C + c sn 0 . 01 f r sn 1 0? figure 5. r-c snubber p r o d u c t i n n o v a t i o n f r o m
pa162 6 pa162u thermal considerations the pa162dk has a large exposed integrated copper heat - slug to which the monolithic is directly attached. the solder connection of the heatslug to a minimum of 1 square inch foil area of the printed circuit board will result in thermal per - formance of 25c/w junction to air rating of the pa162dk. solder connection to an area of 1 to 2 square inches of foil is required for minimal power applications. where the pa162dk is used in higher power applications, it is necessary to use surface mount techniques of heatsink - ing. surface mount techniques include the use of a surface mount fan in combination with a surface mount heatsink on the backside of the fr4/ pc board with through hole ther - mal vias. other highly thermal conductive substrate board materials are available for maximum heat sinking. the power derating graph assumes that the power dissipa - tion is equal in each of the amplifers. 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 confgura - tion provides superior thermal performance by isolating each of the dual amplifers. when loading either of the dual amplifers it is possible to achieve better thermal performance by loading any combination of amplifers (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. power derating junction temperature, t j (c) internal power dissipation, p (w) 0 25 50 75 100 125 20 50 10 40 0 30 (a) amplifier loaded (a+b) amplifiers loaded (a+b+c+d) amplifiers loaded (a+b+c) amplifiers loaded 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 apex.support@cirrus.com. international customers can also request support by contacting their local cirrus logic sales representative. to fnd 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, indemnifcation, 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. this document is the property of cirrus and by furnishing this information, cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. cirrus owns the copyrights associated with the information contained herein and gives con - sent for copies to be made of the information only for use within your organization with respect to cirrus integrated circuits or other products of cirrus. this consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe prop - erty or environmental damage (critical applications). cirrus products are not designed, authorized or warranted to be suitable for use in products surgically implanted into the body, automotive safety or security devices, life support prod - ucts or other critical applications. inclusion of cirrus products in such applications is understood to be fully at the cus - tomers risk and cirrus disclaims and makes no warranty, express, statutory or implied, including the implied warranties of merchantability and fitness for particular purpose, with regard to any cirrus product that is used in such a manner. if the customer or customers customer uses or permits the use of cirrus products in critical applications, customer agrees, by such use, to fully indemnify cirrus, its officers, directors, employees, distributors and other agents from any and all liability, including attorneys fees and costs, that may result from or arise in connection with these uses. cirrus logic, cirrus, and the cirrus logic logo designs, apex precision power, apex and the apex precision power logo designs are trademarks of cirrus logic, inc. all other brand and product names in this document may be trademarks or service marks of their respective owners. p r o d u c t i n n o v a t i o n f r o m
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