apex microtechnology corporation telephone (520) 690-8600 fax (520) 888-3329 orders (520) 690-8601 email prodlit@apexmi crotech.com features lo w 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 a udio power amplifier ideal for single supply systems 5v ? peripherals 12v ? automotive 28v ? avionic description the PA35 consists of a monolithic power op amp with a unity gain buffer in a 7-pin to220 package. the 7-pin to220 ? at 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 -v s . combining the power amp and the unity gain buffer in a parallel connection yields a single 3.4a ampli er. the wide common mode input range includes the negative r ail, facilitating single supply applications. it is possible to have a "ground based" input driving a single supply ampli er with ground acting as the "second" or "bottom" supply of the ampli er. 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. external connections pa3 5 http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology dual power operational amplifiers PA35 123456 7 a b - - + + out amp a -in amp a +in amp a in amp b -vs +vs out amp b parallel connection yields a single 3.4a amplifier r i r f r s r s .2 ? .1 f 1/2 p a35 1/2 p a35 a b 1 ? .1 f 1 ? .2 ? v in v o +v s ? s i 2i i load typical circuit equivalent schematic ?in +in ?v s out +v s sub channel a channel b note: internal bonding represented by dashed line
apex microtechnology corporation 5980 north shannon road tucson, arizona 85741 usa applications hotline: 1 (800) 546-2739 absolute maximum ratings specifications absolute maximum ratings PA35 specifications p arameter test conditions 2 min typ max units input offset voltage, initial 1.5 10 mv offset voltage, vs. temperature full temperature range 15 ?/? bias current, initial 35 1000 na common mode range full temperature range ? s ?3 +v s ? db common mode rejection, dc full temperature range 60 85 db power supply rejection full temperature range 60 80 db gain open loop gain full temperature range 80 100 db gain bandwidth product a v = 40db 600 khz phase margin full temperature range 6 5 ? power bandwidth v o(p-p) = 28v 13.6 khz output current, peak 1.7 a slew rate .5 1.2 v/? capacitive load drive a v = 1 .22 ? vo lt a ge swing full temp. range, i o = 100ma |v s | ?.0 |v s | ?.8 v power supply vo lt a ge, v ss 3 5 4 30 40 v current, quiescent, total 45 90 ma thermal resistance, dc junction to case (single) 5.44 6.80 ?/w resistance, ac junction to case (single) 4.07 5.10 ?/w resistance, dc junction to case (both) 3.64 4.55 resistance, ac junction to case (both) 2.73 3.41 resistance, junction to air 60 ?/w temperature range, case meets full range speci cations ?5 85 ? supply voltage, total 5v to 40v output current 1.7a power dissipation, internal, (per ampli er) 18.5w power dissipation, internal (both ampli ers) 27.5w input voltage, differential ? s input voltage, common mode +v s , -v s ?5v junction temperature, max 1 150? temperature, pin solder?0 sec max 300? temperature range, storage ?5? to 150? operating temperature range, case ?5? to 125? p a35 notes: 1. long term operation at the maximum junction temperature will result in reduced product life. derate inter nal power dissipation to achieve high mttf. 2. unless otherwise noted, the following conditions apply: ? s = ?5v, t c = 25?. 3. +v s and ? s denote the positive and negative supply rail respectively. v ss denotes the total rail-to-rail supply voltage. 4. current limit may not function properly below v ss = 6v, however soa violations are unlikely in this area.
apex microtechnology corporation telephone (520) 690-8600 fax (520) 888-3329 orders (520) 690-8601 email prodlit@apexmi crotech.com typical performance graphs PA35 junction temperature, tj ( c) power derating internal power dissipation, p(w) ?0 0 100 .25 .75 1.5 1.75 bias current 1.0 .5 ?0 0 75 125 case temperature, t ( c) normalized current limit, i (a) 1 100 1m frequency, f (hz) ?0 0 60 small signal response open loop gain, a (db) 20 40 80 100 0 100 .1m ?10 ?50 ?0 0 phase response ?0 ?0 1k 100k frequency, f (hz) 5 output voltage, v (v ) o 100 1k 40k frequency, f (hz) .001 3 harmonic distortion total harmonic distortion, thd (%) .1 1 .7 1.4 normalized quiescent current, i (x) 5 10 40 quiescent current total supply voltage, v (v) 15 35 01.5 2.5 output current, i (a) .5 3 output voltage swing voltage drop from supply, (v) 1.5 2.5 0 10k frequency, f (hz) 60 power supply rejection power supply rejection, psr (db) 69 77 89 100k 10 100 0 time, t ( s) pulse response output voltage, v (v) 10k o .5 3.5 0 current limit 50 .4 .8 1.0 lim 1k ?5 25 50 75 1.25 power response pp 10k .8 .9 1 1.1 1.2 30 10 1k 10k 100k 10 10k 1m frequency, f (hz) phase, ( ) ? normalized bias current, i (x) b 1k 1m 63 74 83 200 400 600 800 1k ?0 ? 0 5 10 o 10 15 20 25 40 50 .01 3 q 20 ss 125 case temperature, t ( c) c ?80 ?20 1.2 1.4 1.6 2 30 |+v | + |? | = 40v s s 66 71 80 86 a v = 1 r =10 l ? ?5 25 100 .6 c a v = ?0 v = 16v r = 8 out l ? 10 1.3 ?0 ?5 0 25 50 75 100 125 case temperature, t ( c) c 1 3.5 12 25 pp 30 25 20 15 10 5 0 025 50 7 5 125 100 both amplifiers each amplifier
apex microtechnology corporation 5980 north shannon road tucson, arizona 85741 usa applications hotline: 1 (800) 546-2739 operating considerations PA35 general please read application note 1 "general operating considerations" which covers stability, supplies, heat sinking, mounting, current limit, soa interpretation, and speci cation 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 speci c 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 current limit is internal to the ampli er, the typical value is shown in the current limit speci cation. s afe 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 e xtensive analytical efforts. under transient conditions, capacitive and dynamic* inductive loads up to the following maximum are safe: vs capacitive load inductive load 20v 200? 7.5mh 15v 500? 25mh 10v 5mf 35mh 5v 50mf 150mh * if the inductive load is driven near steady state conditions, allowing the output voltage to drop more than 6v below the supply rail while the ampli er 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 yback, ex ternal 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 dif cult for the op amp manufacturer to optimize compensation for all operating conditions. the recommended r-c network of 1 ohm in series with 0.1? from output to ac common (ground or a supply rail, with adequate bypass capacitors) will prevent local output stage oscillations. the ampli ers are internally compensated for unity gain stability, no additional compensation is required. thermal considerations the PA35 may require a thermal washer which is electrically insulating since the tab is tied to ? s . this can result in thermal impedances for r cs of up to 1?/w or greater. v bias should be set midway between +v s and -v s , vref is usually ground in dual supply systems or used for level translation in single supply systems. mounting precautions 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 xed terminals. 4. strain relief must be provided if there is any probability of axial stress to the leads. 4 3 2 1 .1 12345789 610 2030 supply to output differential voltage v ? (v) so output current from +v or ? (a) ss 40 5 t = 85 c c dc, t = 25 c c dc, this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible i n accuracies or omissions. all speci? cations are subject to change without notice. p a35u rev. a march 2001 ? 2001 apex microtechnology corp.
|
