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cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 1/12 MC3265N6 cystek product specification current mode pwm controller MC3265N6 description mc3265 is a highly integrated current mode pwm cont rol ic optimized for high performance low standby power offline flyback converter applications. to improve the efficiency, mc3265 works at qr (quasi -resonant) mode or fixed frequency(52khz) while the loading is high and the line voltage is high or low. at normal loading, mc3265 works at qr mode and the frequency is limited to 95khz. to meet the international power conservation requiremen ts, optimized green mode is integrated to improve the efficiency at light or no load conditions with no audible noise. slope compensation is integrated to ensure the stability at high load. lead edge blanking is integrated to prevent the false trigger at the tran sition of the switch. soft switching cont rol at the gate drive can improve the emi performance of the power supply. the gate-drive output is clamped at 16v to protect the power mos. features frequency jitter function to improve emi performance of power supply no-audible-noise gr een mode control multi operation mode: qr, fixed- frequency ccm and green mode. internal slope compensation low vdd startup current and low operating current leading edge blanking uvlo gate max output voltage clamp at 16v overload protection (olp). over temperature protection (otp). line compensation over current protection (ocp) applications offline ac/dc flyback converter for battery charger power adaptor set-top box power supplies open-frame smps pc 5v standby power tv power supplies standby
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 2/12 MC3265N6 cystek product specification ordering information device package shipping MC3265N6 sot-23-6l (pb-free lead plating) 3000 pcs / tape & reel typical application circuit lm8631 pin configuration
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 3/12 MC3265N6 cystek product specification pin assignment pin name pin number pin function gnd 1 ground fb 2 feedback input pin. the pwm duty cycle is determined by voltage level into this pin and the current-sense signal at pin 6. dem 3 the ?valley? and output ove r voltage detect pin. sense 4 current sense input pin. connected to mosfet current sensing resistor node. vdd 5 chip dc power supply pin. gate 6 totem-pole gate drive output for the power mosfet. function block diagram absolute maximum ratings parameter value unit v dd to gnd 29 v v dd clamped current 10 ma v dd clamped voltage 29 v v fb , v sense and v dem to gnd -0.3~+7 v maximum junction temperature (tj max ) 150 c storage temperature range -55 ~ +150 c note stresses beyond those listed under ?a bsolute maximum ratings" may cause permanent damage to the device.
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 4/12 MC3265N6 cystek product specification recommended operating conditions supply voltage, v dd ???????????????????????????...10v to 30v operating temperature range???????????????????????-20 c to 85 c thermal resistance ,junction to ambient (rthja @25 ) : ??????????????.250 c/w esd in formations human body mode---------------- ------------------------------------------------------------ --------- 2000v machine mode----------- ------------------ ----------------- ------------------ ----------------- --------- 200v electrical characteristics (t a = 25 c, v dd =16v if not otherwise noted) ( ta = 25 c, vdd=16v if not otherwise noted ) parameter symbol test conditions min typ max units supply section chip start up current via vdd pin i_set vdd=12v, measure current into vdd pin 3 20 ua operation current i_op vdd=16v,vfb=3v 1.4 ma vdd off(turn-off threshold) uvlo_l 7.5 8.5 9.5 v vdd on(turn-on threshold) uvlo_h 14.5 15.5 16.5 v vdd ovp(over voltage protection ) 25 28 28.5 v vz(vdd clamp voltage) vdd_clp iz(idd)=10ma 28.5 29 30 v feedback section pwm input gain a_pwm vfb/ vcs 3.5 v/v vfb open loop voltage vfb_o 5.3 v fb pin short circuit current vfb_s short fb pin to gnd and measure current 1.1 ma burst mode on threshold v_bm_on 0.9 v burst mode off threshold v_bm_off 0.8 v power limiting fb threshold vfb_th_p 4.4 v power limiting delay time t_pl_d 80 ms input impedance r_fb 5 k ? timer soft start time t_soft start 4 ms burst mode switching frequency f_burst 22 khz max frequency in qr mode fmax_qr 80 95 110 khz min frequency in qr mode fmin_qr 47 52 57 khz max on time ton_max 10 12.5 15 us max off time toff_max 45 60 80 us current sense section leading edge blanking time t_blank 300 400 ns sense pin input impedance r_sense 40 k ? over current threshold voltage at zero duty cycle vth_oc_0 fb=3.3v 0.42 0.45 0.48 v
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 5/12 MC3265N6 cystek product specification over current threshold voltage at max. switching on time vth_oc_1 fb=3.3v 0.8 0.85 v over current protect delay t_oc_d cs>vth_oc, fb=3.3v,cl=1nf @gate 75 ns gate output output low level(turn-off) vol io=20ma 0.8 v output high level(turn-on) voh io=20ma 10v v output voltage clamped level vo_clamp 16 v output rising time (10%~90%) tr cl=1nf 220 ns output falling time(90%~10%) tf cl=1nf 70 ns dem pin dem comparator threshold voltage vth_dem 75 mv suppression time @ the ringing stage t_supp 2.5 us timeout after last dem. transistion t_out_dem 5 us dem. propagation delay t_dem_d 250 ns output ovp trigger point vth_ovp 3,75 v output ovp delay time t_ovp_de 4 cycle otp thermal shutdown temperature tem_off 145 150 160
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 6/12 MC3265N6 cystek product specification characterization plots ta = 25 c, vdd=16v if not otherwise noted start current vs vdd voltage uvlo voltage& operation current operation current vs load uvlo (on) voltage vs temp uvlo (off) voltage vs temp
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 7/12 MC3265N6 cystek product specification operation description over-view description the mc3265 includes all necessary function to build an easy and cost effective solution for low power supplies to meet the international power conservation requirements. start-up current startup current of mc3265 is designed to be very low so that vdd could be charged up above uvlo (exit) threshold level and device starts up quickly. also a large value st artup resistor can be used to minimize the power loss. green mode operation patent at light load or no load condition, the switch lo ss become the major loss of the power supply, to reduce the power wasted in light and no load condition, based on a special designed voltage controlled oscillator, green mode operation of the power supply can be ac hieved by using mc3265. the controller will judge the load condition base on the voltage of fb pin. in light load t he fb voltage will decrease, when vfb is lower than a set threshold voltage, a fb depending time (tr2) will be generated by the oscillator and decrease the operating frequ ency of the power supply, the minimum frequency is set about 22khz. the function block and the working waveform can be depicted as below: when v fb decrease further, the power s upply will enter into burst mode operation to decrease the power consumed at no load condition. besides there is no audible noise in any load condition. while mc3265 works in ccm mode, slope compensation and frequency shuffling is activated. the sensed voltage across the sense resistor is used for pwm control, and pulse by pulse current limit, built-in slope compensation circuit adds a voltage
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 8/12 MC3265N6 cystek product specification multi-mode operation mc3265 is a multi-mode qr-pwm controller. the contro ller changes the mode of operation according to line voltage and load conditions. at full load and low line input condition, the ic opera tes in fix frequency(52khz) ccm mode; at full load and high line input condition, the ic operates in qr mode. thus, high po wer conversion efficiency can be achieved in the universal input range when system is at full loading conditions. at normal loading conditions, the system operates in qr mode (frequency is clamped between 52khz to 95khz). at light load conditions, the system operat es in green mode for high power conversion. built-in slope compensation and frequency shuffling while mc3265 works in ccm mode, slope compensation an d frequency shuffling is activated. the sensed voltage across the sense resistor is used for pwm c ontrol, and pulse by pulse current limit, built-in slope compensation circuit adds a voltage ramp onto the curre nt sense input voltage. this greatly improves the close loop stability and prevents th e sub-harmonic oscillation of peak current mode pwm control scheme. to improve the emi performance, the frequenc y of ccm mode is shuffling to 52khz 5% line slope compensation adjusting the rsense can set the max output power of the power supple mode. the current flowing by the power mosfet has an extra value due to the system dela y t that the current detect ed from the sense pin to power mosfet cut off in the mc3265. to guarantee the output power is a constant for universal input ac voltage, there is a positive ramp signal to compensate the system delay t and the line input. at lower line-input voltage the higher ocp threshold will bring constant power ocp as below. demagnetization(dem.) detection the transformer core demagnetization is detected by monitoring the voltage waveform on the auxiliary winding through dem pin. while the voltage on dem pin is lower than 75mv, dem. detection will generate a ?valley? signal and mc3265 make the ga te on depending the condition of fb and sense pins. to avoid the ringing of the mosfet?s drain voltage mi sleading this function, t_supp is added. each time the gate is off, t_supp starts to count. during t_supp, gate remains low and can?t be turn to high.
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 9/12 MC3265N6 cystek product specification leading edge blanking each time when the power mosfet is switched on, a turn-on spike will inevitably occur on the sense-resistor. to avoid premature termination of the switching pulse, a 300 nsec leading-edge blanking time is built in. conventional rc filtering can theref ore be omitted. during this blanking period, the current-limit comparator is disabled a nd it cannot switch off the gate driver. gate driver the output stage of mc3265 is a fast totem pole ga te driver. cross conduction has been avoided to minimize heat dissipation, increases efficiency and enha nces reliability. the output driver is clamped by an internal 16v zener diode in order to protect powe r mosfet transistors against undesirable gate over voltage. a soft driving waveform is implemented to minimize emi. protect functions to increase the reliability of power supply system many protection functions is integrated in this controller, including cycle-by-cycle current limiting (ocp), over load prot ection (olp), over temperature protection(otp), output over voltage protection ( ovp) and over voltage clamp, under voltage lockout on vdd (uvlo). at overload condition when fb input voltage exceeds power limit threshold value for more than td_pl (power limit debounce time), the controller reacts to shut down the output power mosfet. device restarts when vdd voltage drops below uvlo limit. vdd is supplied by transformer auxiliary winding output. it is clamped when vdd is higher than threshold value. the power mosfet is shut down when vdd drops below uvlo limit and devi ce enters power on start-up sequence thereafter. pin floating protection for cs, fb, de m is also added. while one of this happens, the gate is turned off.
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 10/12 MC3265N6 cystek product specification reel dimension carrier tape dimension
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 11/12 MC3265N6 cystek product specification recommended wave soldering condition product peak temperature soldering time pb-free devices 260 +0/-5 c 5 +1/-1 seconds recommended temperature profile for ir reflow profile feature sn-pb eutectic assembly pb-free assembly average ramp-up rate (tsmax to tp) 3 c/second max. 3 c/second max. preheat ? temperature min(t s min) ? temperature max(t s max) ? time(ts min to ts max ) 100 c 150 c 60-120 seconds 150 c 200 c 60-180 seconds time maintained above: ? temperature (t l ) ? time (t l ) 183 c 60-150 seconds 217 c 60-150 seconds peak temperature(t p ) 240 +0/-5 c 260 +0/-5 c time within 5 c of actual peak temperature(tp) 10-30 seconds 20-40 seconds ramp down rate 6 c/second max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. note : all temperatures refer to topside of t he package, measured on the package body surface.
cystech electronics corp. spec. no. : c595n6 issued date : 2012.02.23 revised date : page no. : 12/12 MC3265N6 cystek product specification sot-23-6l dimension j 12 3 4 5 6 a b c d d1 d2 e f g k i l h marking: 6-lead sot-23-6l plastic surface mounted package cystek package code: n6 style: pin 1. gnd pin 2. fb pin 3. dem pin 4. sense pin 5. vdd pin 6. gate 65abc device name date code inches millimeters inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.1063 0.1220 2.70 3.10 f 0.0472 ref 1.20 ref b 0.1024 0.1181 2.60 3.00 g 0 0.0059 0 0.15 c 0.0551 0.0709 1.40 1.80 h - 0.0086 - 0.22 d 0.0748 ref 1.90 ref i 0.0047 ref 0.12 ref d1 0.0374 ref 0.95 ref j 0.0146 ref 0.37 ref d2 0.0374 ref 0.95 ref k 0.0236 ref 0.60 ref e 0.0118 0.0217 0.30 0.55 l 0 10 0 10 notes : 1.controlling dimension : millimeters. 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing specification or packing method, please c ontact your local cystek sales office. material : ? mold compound : epoxy resin family, flammability solid burning class:ul94v-0 important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of cystek. ? cystek reserves the right to make changes to its products without notice. ? cystek semiconductor products are not warranted to be suitable for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance .

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