pa15fl ? pa15fla pa15flu 1 pa15fl, pa15fla typical application low power, piezoelectric positioning piezo positioning may be applied to the focusing of segment - ed mirror systems. the composite mirror may be composed of hundreds of elements, each requiring focusing under computer control. in such complex systems the pa15fl reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increasing circuit density with the sip package. external connections phase compensation gain c c r c 1 33pf 1k 10 open open .6 r cl ? i cl features ? high voltage 450v (225v) ? low cost ? low quiescent current 3.0ma max ? high output current 200ma ? programmable current limit applications ? piezoelectric positioning ? high voltage instrumentation ? electrostatic transducers ? programmable power supplies up to 440v description the pa15fl is a high voltage, low quiescent current mosfet operational amplifer designed as a low cost solution for driving continuous output currents up to 200ma and pulse currents up to 350ma into capacitive loads. the safe operating area (soa) has no second breakdown limitations and can be observed for all type loads by choosing an appropriate current limiting resistor. the mosfet input stage has integrated static and differential mode protection. the mosfet output stage is biased ab for linear operation. external compensation provides fexibility in choosing bandwidth and slew rate for the application. the 10-pin power sip package is electrically isolated. equivalent schematic q1 q2 6 1 2 5 9 8 10 7 r1 r2 c1 r3 q3 cc1 cc2 q6 q5 r5 r8 r9 q15 r11 r12 q16 q12 q8 r4 r7 q4 ilim out q14 r10 q13 q11 +v s Cin +in Cv s r6 computer focus command voltage r f r in +v s -v s 1 2 5 7 6 10 pa15fl v out piezo drive r cl r cl c c 1 2 3 4 5 6 7 8 9 10 Cin +in nc Cv +v c c1 i lim c c2 r c out nc s s 10-pin sip package style fl formed leads available see package style fu high voltage power operational amplifiers pa15fl ? pa15fla p r o d u c t i n n o v a t i o n f r o m copyright ? cirrus logic, inc. 2010 (all rights reserved) www.cirrus.com mar 2010 apex ? pa15flureve p r o d u c t i n n o v a t i o n f r o m ?
pa15fl ? pa15fla 2 pa15flu absolute maximum ratings supply voltage, +v s to Cv s 450v output current, source, sink see soa power dissipation, continuous @ t c = 25c 30w input voltage, differential 25v input voltage, common mode v s temperature, pin solder - 10s max 260c temperature, junction 2 150c temperature range, storage C40 to +85c operating temperature range, case C25 to +85c specifications pa15fl pa15fla parameter test conditions 1 min typ max min typ max units input offset voltage, initial 2 10 .5 3 mv offset voltage, vs. temperature full temperature range 15 50 5 20 v/c offset voltage, vs. supply 10 50 * * v/v offset voltage, vs. time 75 * v/kh bias current, initial 200 2000 * * pa bias current, vs. supply 4 * pa/v offset current, initial 50 500 30 200 pa input impedance, dc 10 11 * input capacitance 4 * pf common mode voltage range 3 v s C15 * v common mode rejection, dc v cm = 90v 80 98 * * db noise 10khz bw, r s = 1k, c c = open 2 * vrms gain open loop, @ 15hz r l = 2k, c c = open 94 111 * * db gain bandwidth product at 1mhz r l = 2k, c c = open 5.8 * mhz power bandwidth r l = 2k, c c = open 24 * khz phase margin full temperature range 60 * output voltage swing 3 i o = 200ma v s C15 v s C10 * * v current, continuous 200 * ma slew rate, a v = 100 c c = open 20 20 30 v/s capacitive load, a v = +1 full temperature range 100 * pf settling time to .1% c c = open, 2v step 2 * s resistance, no load 50 * power supply voltage 5 see note 5 50 150 225 * * * v current, quiescent, 2.0 3.0 * * ma thermal resistance, ac, junction to case 4 full temperature range, f > 60hz 2.5 * c/w resistance, dc, junction to case full temperature range, f < 60hz 4.2 * c/w resistance, junction to air full temperature range 30 * c/w temperature range , case meets full range specifcations C25 +85 * * c notes: * the specifcation of pa15fla is identical to the specifcation for pa15fl in applicable column to the left. 1. unless otherwise noted: t c = 25c, compensation = c c = 33pf, r c = 1k, r cl = 0. dc input specifcations are value given. power supply voltage is typical rating. 2. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dissipation to achieve high mttf. 3. +v s and Cv s denote the positive and negative power supply rail respectively. 4. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 5. derate max supply rating .625 v/c below 25c case. no derating needed above 25c case. caution the pa15fl is constructed from mosfet transistors. esd handling procedures must be observed. the exposed substrate contains beryllia (beo). do not crush, machine, or subject to temperatures in excess of 850c to avoid generating toxic fumes. p r o d u c t i n n o v a t i o n f r o m ?
pa15fl ? pa15fla pa15flu 3 100k 1m frequency, f (hz) 270 45 phase response phase, () 100k 10m frequency, f (hz) C10 0 30 small signal response open loop gain, a (db) 10 20 40 50 10 1m frequency, f (hz) 20 80 common mode rejection common mode rejection, cmr (db) 40 60 100 1 1m frequency, f (hz) 0 20 120 power supply rejection power supply rejection, psr (db) 40 80 output impedance, r () 3m 10k 100k frequency, f (hz) harmonic distortion distortion, (%) .1 .3 30k 100 1k 10k 100 300 total supply voltage, v s (v) 2.0 open loop output impedance quiescent current, i q (ma) 2.4 1k 10k voltage drop from supply, +v s C v o (v) 10 100 1k 10k .1m 60 2.2 .001 1m 225 180 450 2.6 2.8 1m .01 100 135 100 .1m 10m 200 400 t c = 85c t c = 25c t c = 125c c c = open quiescent current 0 50 100 150 200 250 300 350 400 10m swing from Cv s 0 40 200 load current, i (ma) 80 120 160 0 16 24 8 20 4 12 125c 85c 25c C55c 125c 85c C55c 25c swing from +v s 0 40 160 200 load current, i (ma) 80 120 r l = 1k c c = open a = 30 5 watt 50 mw 2k 100k frequency, f (hz) 20 500 output voltage, v o (v p-p ) power response 10k 100 c c = open c c = 15pf 2 10 4 8 6 voltage drop from supply, +v s C v o (v) 200k 30 frequency, f (hz) c c = open c c = 33pf c c = open 10 10m frequency, f (hz) C20 0 60 small signal response open loop gain, a (db) 20 40 80 120 10k 100 c c = 33pf c c = open c c = 33pf c c = open 90 100 1k .1m 1m c c = 33pf 0 25 50 75 100 125 150 case temperature, t c (c) 0 8 24 32 power derating output stage internal power dissipation, p (w) 16 40 t c = -55c p r o d u c t i n n o v a t i o n f r o m ?
pa15fl ? pa15fla 4 pa15flu general please read application note 1 "general operating con - siderations" which covers stability, supplies, heat sinking, mounting, current limit, soa interpretation, and specifcation interpretation. visit www.cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; apex precision powers complete application notes library; technical seminar workbook; and evaluation kits. current limit for proper operation, the current limit resistor (r cl ) must be connected as shown in the external connection diagram. the minimum value is 2 ohm, however for optimum reliability the resistor value should be set as high as possible. the value is calculated as follows; with the maximum practical value of 150 ohms. .6 r cl = i lim safe operating area (soa) the mosfet output stage of this power operational ampli - fer has two distinct limitations: 1. the current handling capability of the mosfet geometry and the wire bonds. 2. the junction temperature of the output mosfets. input protection although the pa15fl can withstand differential input voltages up to 25v, additional external protection is recommended. in most applications 1n4148 or 1n914 signal diodes are sufficient (d1-d4 in figure 2a). in more demanding applications where low leakage or low capacitance are of concern 2n4416 or 2n5457-2n5459 jfets connected as diodes will be required (q1-q4 in figure 2b). in either case the input differential voltage will be clamped to 1.4v. this is sufficient overdrive to produce maximum power bandwidth. power supply protection unidirectional zener diode transient suppressors are recom - mended as protection on the supply pins. the zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. whether the zeners are used or not, the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as line regulation. conditions which can cause open circuits or polarity reversals on either power supply rail should be avoided or protected against. reversals or opens on the negative supply rail are known to induce input stage failure. unidirectional transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifer as possible. stability the pa15fl has sufficient phase margin to be stable with most capacitive loads at a gain of 10 or more, using the recom - mended phase compensation. the pa15fl is externally compensated and performance can be tailored to the application. use the graphs of small signal response and power response as a guide. the compensation capacitor c c must be rated at 500v working voltage. an npo capacitor is recommended. the compensation network c c r c must be mounted closely to the amplifer pins 8 and 9 to avoid spurious oscillation. figure 2. overvoltage protection pa15fl +v s Cin +in z1 z2 d4 d3 6 5 1 2 +v s z1 z2 6 5 pa15fl a. b. Cv s Cv s d2 d1 Cin +in 1 2 q1 q2 q3 q4 soa supply to output differential, v s Cv o (v) 25 50 75 100 250 500 output current from +v s or Cv s , (ma) 10 20 30 50 100 200 300 500 dc, t c = 125c dc, t c = 85c 200ms pulse curves @ 10% duty cycle max dc, t c = 25c 100ms 125 p r o d u c t i n n o v a t i o n f r o m ?
pa15fl ? pa15fla pa15flu 5 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 ?
|
