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MP26085 cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 1 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the MP26085 is a voltage and current control ic integrated a precision voltage reference and a current source, which is suitable for battery charger, second controller of switching regulator systems, and other types of application required an accurate voltage and current control systems. this ic compares the dc voltage and the current level at the output of a switching power supply to the voltage reference and current limitation, respectively. it provides a feedback through an opto-coupler to the pwm controller ic at the primary side. the current source is controlled externally, which can be used to modify the level of current limitation by offsetting the information coming from the current sensing resistor. it is available in an 8-pin tsot23 package. features ? constant voltage and constant current control ? 1.223v built-in voltage reference with 1% accuracy ? wide input voltage range: 7v to 20v ? two operational amplifier with ored output and 1mhz bandwidth ? built-in current generator with enable/disable function ? 8-pin tsot23 package applications ? battery chargers ? every types of application required an accurate voltage and current control all mps parts are lead-free, halogen free, and adhere to the rohs directive. for mps green status, please visit mps website under qualit y assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application controller + ++ MP26085 .. . to battery pack comp vref ifb in vfb iref gnd icon gnd 5v r sen rs r1 r2 c1 r3 r4 rif acin r5 r6 c2 c3 c4 c5 c6 c7 c8 r7 opto q1 t1 d1 l1
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 2 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. ordering information part number* package top marking free air temperature range (t a ) MP26085dj tsot23-8 aax -40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP26085dj?z); for rohs, compliant packaging, add suffix ?lf (e.g. MP26085dj?lf?z). package reference tsot23-8 absolute maxi mum ratings (1) in pin .............................................-0.3v to 22v comp pin ......................................-0.3v to 22v all other pins .................................-0.3v to 6.5v continuous power dissipation (t a =25 o c) (2) tsot23-8 ................................................ 0.45w storage temperature range.... -65c to 150c recommended operating conditions (3) supply input voltage ..........................7v to 20v maximum junction temp. (t j ) ................+125c thermal resistance (4) ja jc tsot23-8.............................. 220 .... 110.. c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 3 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. electrical characteristics v in = 15v, t a = 25c, unless otherwise noted. notes: 5) guaranteed by design. 6) line regulation= )min_vcc(source )max_vcc(source i i ? parameter symbol condition min typ max units total supply current i in v in = 15v, icon=5v, no load 0.2 ma operational amplifier input voltage range (5) v i 0 3 v input offset voltage v os t a = 25 o c -5 1 +5 mv input bias current i b t a = 25 o c -700 -300 0 na t a = 25 o c, v _comp =0.5v 15 output sink current i comp_sink -40 o c t a +85 o c 8 ma large signal voltage gain (5) a vo r l =2k ? , 15 v/mv supply voltage rejection ratio (5) svr supply voltage change of 1.0v 65 90 db common mode rejection ratio (5) cmrr 80 db gain bandwidth product (5) gbw v in =15v, v i = 10mv, r l =2k ?, c l =100pf 1 mhz output leakage current i comp_leak age t a = 25 o c 2 a voltage reference reference voltage v ref i out = 1ma, t a = 25c 1.21 1.223 1.236 v temperature coefficient tc v -40 o c t a +85 o c 60 100 ppm/ o c current generator current source i source r3+r4=44k ? 1.25 ma temperature coefficient tc i -40 o c t a +85 o c 100 ppm/ o c line regulation of current source (6) 7v < v in < 20v 0.003 0.03 ma voltage at icon pin to enable v icon_en i source = 1.25ma 0.6 v voltage at icon pin to disable v icon_dis i source = 0ma 2 v input current on the icon pin icon in v icon =6.5v 30 a icon pin source current icon in v icon =0v 30 a
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 4 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. pin functions package pin # name description 1 ifb current feedback. connected to the sense resistor. 2 iref current limitation reference input. an external resistor divider (sum is 44k ? ) from the vref to gnd tapped to the iref pin sets the current reference. 3 gnd ground 4 comp output pin common to the voltage regulation and current limitation loops. this output can drive the primary side (led) of an opto-coupler. 5 vfb voltage feedback. a n external resistor divider from the output to gnd tapped to the fb pin sets the output voltage. 6 vref internal voltage reference output. this voltage is used to generate the voltage and current reference. 7 in power supply input. bypass vin to gnd with a 4.7 f or greater capacitor. 8 icon current source enable input. this current source can be used to offset the voltage measurement on the sense resi stor and therefore to modify the charge current. the current source enabled when the input voltage on icon pin is lower than 0.6v.
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 5 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics t a = 25c, unless otherwise noted. current source vs. ambient temperature icon input bias current vs. ambient temperature supplycurrent vs. ambient temperature v ref vs. amibent temperature 1.2 1.21 1.22 1.23 1.24 1.25 v icon =6.5v 0 1 2 3 4 5 -40 -20 0 25 70 85 v in =15v v in =7v v in =20v -40 -20 0 25 70 85 1220 1230 1240 1250 1260 1270 -40 -20 0 25 70 85 v in =7v v in =15v v in =20v 0 50 100 150 200 250 -40 -20 0 25 70 85 v in =20v v in =15v v in =7v i fb input bias current vs. ambient temperature -40-20 0 257085 v in =15v, v_i fb =6.5v i ref input bias current vs. ambient temperature 0 0.003 0.006 0.009 0.012 0.015 -40-20 0 257085 v in =15v, v_i ref =6.5v -0.011 -0.01 -0.009 -0.008 -0.007 -0.006 0 0.004 0.008 0.012 0.016 0.02 -40 -20 0 25 70 85 v fb input bias current vs. ambient temperature v in =15v, v_v fb =6.5v cc/cv op amp short circuit current vs. ambient temperature 0 40 80 120 160 200 -40 -20 0 25 70 85 v comp =0.5v v comp =0.5v 0 20 40 60 80 100 120 -40 -20 0 25 70 85 cc op amp short circuit current vs. ambient temperature
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 6 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) t a = 25c, unless otherwise noted. v comp =0.5v 0 20 40 60 80 100 120 -40 -20 0 25 70 85 cv op amp short circuit current vs. ambient temperature
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 7 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. operation the MP26085 integrates a high precision band gap voltage reference, two operational amplifiers and a current source (figure 1). it is intended for use in a switching mode power supply (smps) to realize constant current and constant voltage control. voltage reference the voltage reference of MP26085 is 1.223v. voltage regulation loop the voltage regulation is done by comparing the feedback output voltage (resistor divider r1 and r2) to the voltage reference (1.223v). if it is higher than 1.223v, the output of the voltage loop operational amplifier decreases. the optocoupler current increases and tends to reduce the output voltage by the way of the pwm controller. current limitation loop the current limitation is performed by sensing the voltage across the low ohmic value resistor r sen and comparing it to a fixed value set by the r-divider composed by r3 and r4 (r3+r4=44k ? in the typical application circuit). when the voltage on r sen is higher than the voltage on the iref pin the output of the current loop operational amplifier decreases. the optocoupler current increases and tends to reduce the output voltage by the way of the pwm controller. current source the current source of MP26085 is controlled by the icon pin by connecting the icon pin to the ground, the current source is enabled. MP26085 mirrors the current through v ref pin to generate the current source with the gain ki=45. the current goes through v ref pin is determined by the external r-divider, r3 and r4 (typical application circuit). so, the current source is calculated as: ref source v iki r3 r4 = + then, we can offset the sensing output current by a voltage equal to: _ offset source vrifi = this offset lowers the output current and this function can be used to charge batteries with different capacities. voltage reference vref in comp gnd vfb ifb iref icon regulator buffer figure 1?block diagram
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 8 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. application information setting the constant output voltage the output voltage is set by selecting the resistive voltage divider ratio. the voltage divider drops the charge voltage to the internal voltage reference 1.223v,. generally, use 10k ? for the low-side resistor of the voltage divider. determine the high-side resistor by the equation: 1) 1.223v v (r2r1 o ? = where r1 is the high-side resistor, r2 is the low-side resistor and v o is the constant output voltage. setting the constant output current /current limitation the output current is regulated effectively when the voltage drop across r sen is equal to the voltage on iref pin of the MP26085 (assuming that the internal current source is disabled). r sen is the sense resistor used for current measurement. for general application (<1a), the voltage drop across r sen is recommended to be 200mv. r sen can be standard low cost 0.5w resistors in parallel. _ iref sen o v r i = the output current is set by scaling v ref through r3 and r4: _ iref ref r4 vv r3 r4 = + the ratio of r3 and r4 determines the current reference, and the sum of the resistances of r3 and r4 sets the current source. so, it is recommended to set the sum of r3 and r4 to get current source first (recommended 44k ? ), then select a suitable ratio between r3 and r4 to achieve the current reference value. output current adjustment if the icon pin is left open or connected to 5v v cc , the output current is determined by the iref and sensing resistor r sen . sen _iref o r v i = if icon pin is connected to ground, the internal current source is enabled, the current measurement is off-set by a voltage equal to: ref _offset v vrifki r3 r4 = + this can be used to lower the output current for trickle charge or eventually to stop the charge.
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 9 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical application circuits figure 2? adapter / battery charger using MP26085 with auxiliary winding controller + + MP26085 comp vref ifb in vfb iref gnd rsen rs r1 r2 c1 r3 r4 rif acin c4 c5 r7 opto q1 t1 d1 icon c2 c3 r5 r6 c6 d2 r8 r9 r10 r12 r11 r13 r14 d3 q2 .. . battery pack figure 3?charger with trickle charge and led indication using MP26085
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 10 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the MP26085 also can be used in led lighting to realize the analog dimming or digital dimming control, figure 4 shows single stage flyback with MP26085, the single stage flyback is controlled by mp44010, two dimming functions are realized by MP26085. when analog dimming control is adopted, the iref is generated from the analog dimming signal. r31 is 0, r30 and q4 is not connected, the system output current for led is controlled by analog dimming signal, iref is va 35r34r36r 35r ++ , where va is the amplitude of the analog dimming signal. when digital dimming control is adopted, the iref is generated from vref. r30 is 0, r31 is not connected, q4 is controlled by the digital dimming signal to adjust the led current reference. when the digital dimming signal is high, q4 is on, iref is vref 35r34r 35r + , when the digital dimming signal is low, q4 is off, iref is 0. so the led current is controlled by the duty of digital dimming signal. figure 5 is a typical application for charger with MP26085, hfc0100, and mp6902, the input voltage is 85v~265v ac, output 36v dc, 1.8a. hfc0100 is a quasi resonant controller for fly back, and mp6902 is a fast turn-off intelligent rectifier.
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 11 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. 30mh lcm1 3 4 2 1 br1 2kbp06m 220nf c1 13.3k r8 68k r13 22uf c8 d4 1n4148 gnd 6 zcs 5 gate 7 vin 8 mult 3 cs 4 comp 2 fb 1 u1 mp44010 3.65k r20 0.22u c2 10k r5 300k r15 d5 fr107 330uf c15 2.2n c5 36.5k r9 0.1uf c9 0 r11 nc c6 2m r6 cx1 0.1uf 20v d3 nc r1 cx2 0.22uf 5.1 r14 5.1 r16 d6 1n4148 0.3 r19 51.1k r7 1 2 4 3 u2 pc817c va 330uf fu1 71c c19 led+ 10nf c18 nc c22 4.7uf c24 led- 0.1 r32 ac in 1mh ldm1 ss-5-1a f1 var1 2 3 1 q2 ap2763i 3.3nf c12 630v 0.3 r18 nc c25 0.1uf c23 nc r2 0.1u c13 10k r26 1k r28 10k r29 0 r25 412k r27 10nf c11 22p c10 MP26085 ifb 1 iref 2 gnd 3 comp 4 vfb 5 vref 6 in 7 icon 8 u3 mmbta06 3 1 2 q3 10uf c21 d8 8.2v 5.11k r24 va nc c20 pwm dimming gnd c27 1uf 10k r21 316k r36 4.99k r35 0 r31 39.2k r34 0-10v dimming 3 2 1 q4 2n7002 t1 ee25 10uf c14 vcc 16v d1 100nf c4 0.47uf c7 d2 1n4148 2 3 1 q1 ap2761i 3.3 r12 2.2nf c3 vcc 0 r30 499k r3 499k r4 nc r10 10uf c16 10k r22 10k r23 d7 uf3004 0.1 r33 d9 1n4148 470pf c28 470pf c26 100k r17 figure 4?single stage flyback using MP26085 for led lighting
MP26085 ? cc/cv controller MP26085 rev. 1.02 www.monolithicpower.com 12 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. 2 1 10 r34 pc817b 4 3 1 2 u2 gnd 7 vcc 2 fb 8 drv 5 cs 6 demag 1 na 3 hv 4 u3 2 1 0.4 r10 2 1 33pf c17 2 1 1 r35 2 1 1 r36 2 1 1 r37 2 1 1 r38 2 1 33pf c15 2 1 220pf c16 2 1 10 r13 1 2 5.1k r15 2 1 20k r12 2 3 1 q1 2 1 10m r23 2 1 51.1k r3 2 1 100 r8 vss 5 vg 8 vd 4 nc 7 rll 3 pgnd 1 en 2 vdd 6 u1 mp6902 1 2 d2 1 2 100uf c2 1 2 100uf c1 1 2 4 3 bd1 gub406 1 2 3 4 40mh lx1 2 1 1m r1 2 1 1m r2 1 2 0.22uf cx1 1 2 4.7nf cy1 1 2 4.7nf cy2 1 2 1 1 cn1 1 2 5.1 rt1 1 2 2.2uf c5 1 2 30k r31 1 2 10k r32 2 1 1nf c4 1 2 100k r7 2 1 10 r5 1 2 10k r6 1 2 d3 2 1 1uf c8 1 2 1 1 cn2 1 2 nc r18 1 2 13k r17 2 1 0.4 r9 2 1 0.1uf c12 1 2 47uf c13 1 2 47uf c11 1 2 5.1k r27 1 2 1.02k r20 1 2 24.9k r19 1 2 147k r26 1 2 0 r25 1 2 196k r24 2 1 15nf c18 1 2 10 r22 1 2 100k r28 1 2 100k r30 1 ifb 1 icon 1 2 196k r21 2 1 15nf c20 1 2 3.3uh l1 2 1 0.1uf c14 MP26085 ifb 1 iref 2 gnd 3 comp 4 vfb 5 vref 6 in 7 icon 8 u4 1 2 470uf c6 1 2 470uf c7 1 2 4.7nf c10 1 2 4.7nf c3 1 2 1nf cy3 2 1 2.2uf c19 2 1 33k r4 2 1 33k r14 2 1 40.2k r11 1 2 100m r29 1 2 100m r40 1 2 d1 1 2 d5 2 1 f1 1 2 100uf c9 2 1 0 r16 1 2 d4 1 2 100m r39 1 2 100m r33 2 1 nc c21 3 2 1 q2 irfp250b 10 12 8 11 3 1 6 5 9 7 t1 pq2625 figure 5? application circuit of MP26085 for charger
MP26085 ? cc/cv controller notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP26085 rev. 1.02 www.monolithicpower.com 13 11/30/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. package information tsot23-8 front view note: 1) all dimensions are in millimeters. 2) package length does not include mold flash, protrusion or gate burr. 3) package width does not include interlead flash or protrusion. 4) lead coplanarity (bottom of leads after forming) shall be 0.10 millimeters max. 5) jedec reference is mo-193, variation ba. 6) drawing is not to scale. 7) pin 1 is lower left pin when reading top mark from left to right, (see example top mark) top view recommended land pattern seating plane side view detail ??a?? see detail ??a?? pin 1 id see note 7 example top mark

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