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fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page1 high efficiency off-line cc/cv switch features description ? constant-current (cc) and constant-voltage (cv) with primary side control ? proprietary technology enabling high efficiency and fast dynamic response ? satisfies doe level vi requirements for 5v/1a and 5v/1.5a applications ? no audible noise over entire operating range ? optimization for capacitive loading ? built-in power npn/mos ? built-in cable compensation ? built-in line compensation ? primary-side feedback eliminates opto-coupler and tl431 ? cycle-by-cycle current limiting ? over temperature protection ? vcc over voltage protection ? cv open-loop protection ? excellent capacitive loading start-up performance typical application ? adapter/charger for cell/cordless phones, pdas, mp3 and other portable apparatus ? standby and auxiliary power supplies set top boxes (stb) ? adapter for adsl / wifi wireless ? ac/dc led driver applications the FT839NB/ft839mb controller device is optimized for high-performance, low power switching mode power supply applications. the FT839NB/ft839mb facilitates cc/cv charger design by eliminating an opto-coupler and tl431. its highly integrated functions such as under voltage lockout (uvlo), leading edge blanking (leb) and built-in cable compensation offer the users a high efficiency and low cost solution for ac/dc power applications. power supplies built with FT839NB/ft839mb can achieve both highest average efficiency fast dynamic load response and super low standby power. FT839NB and ft839mb satisfy doe level vi requirements with production margin for 5v/1a and 5v/1.5a applications, respectively. furthermore, FT839NB/ft839mb features fruitful protections like open circuit protection and over temperature protection to eliminate the external protection circuits and provide reliable operations. FT839NB/ft839mb is available in sop8 package. fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page2 typical application circuit figure 1.1: FT839NB typical application circuit figure 1.2: ft839mb typical application circuit fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page3 absolute maximum ratings fb to gnd?????????? ??...??????????????. ??.??.?.... -0.3v to +7v cs to gnd??????????? ?????...???????? ??????.??.....-0.3v to +7v vcc to gnd?????????????..????.???????????????-0.3v to +30v c to gnd?????????????...???????????.???.????......-0.3v to +700v operating temperature ra nge????????...???????????????...-40 to +125 junction temperature??????? ?????..?????????? ????.... -40 to +150 storage temperature range ???????????..?????????????.-60 to +150 esd protection hbm??????.....?????????????????????????.2000v esd protection mm??????..???????????????????????????.200v *stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliability . fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page4 pin configuration figure 2: pin assignments terminal definition pin name description 1 cs primary current sense 2 fb output voltage feedback pin 3 gnd ground. 4 vcc supply voltage 5 6 nc no connection 7 8 c or d c: the collector of the power npn for FT839NB; d: the drain of the power mos for ft839mb. this pin is connected to t he primary lead of the transformer table 1 fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page5 ordering information FT839NB x x - xx ft839mb x x - xx FT839NB /ft839mb table 2 device designator symbol options 0 cable comp = 0% 1 cable comp = 3% 2 cable comp = 6% FT839NB ft839mb 3 cable comp = 9% circuit type package blank: sop8 hsf and packaging rb: rohs and tube rt: rohs and t&r gb: green and tube gt: green and t&r cable comp 0: 0% 1: 3% 2: 6% 3: 9% circuit type package blank: sop8 hsf and packaging rb: rohs and tube rt: rohs and t&r gb: green and tube gt: green and t&r cable comp 0: 0% 1: 3% 2: 6% 3: 9% fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page6 marking rule figure 3: marking rule : represents version (0, 1, 2 or 3) ??? : for internal reference fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page7 block diagram figure 4.1: FT839NB block diagram fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page8 figure 4.2: ft839mb block diagram fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page9 electrical characteristics ( for typical values tj=25 , vcc=12v, unless otherwise noted ) characteristic symbol min typ max unit current sense maximum current threshold vcs_max 541 552 563 mv leading edge blanking duration tleb 350 400 450 ns propagation delay (out=1.0nf to gnd) tpd 200 ns feedback section feedback voltage threshold vfb 2.856 2.9 2.944 v ccm protection threshold level vcp 100 mv supply section start up threshold voltage vcc_on 15.5 16.2 17.5 v under voltage lockout voltage vcc_off 5.2 5.5 6.0 v vcc start up current istart_up 2 5 ua operating current iop 0.4 0.5 0.7 ma protection section feedback loop open protection ifb_open 90 115 140 ua vcc over voltage protection vcc_ovp 26 27 28 v over temperature protection t_otp 145 compensation line compensation (ifb=1ma) vline 25 33 40 mv 0 0 1 3 2 6 cable compensation 3 kcab 9 % power npn section (FT839NB) characteristic test condition symbol min typ max unit collector-base breakdown voltage ic=0.1ma vcbo 700 v collector-emitter breakdown voltage ic=1ma vceo 400 v emitter-base breakdown voltage i e= 0.1ma vebo 9 v collector-emitter saturation voltage i b =0.25a,i c =1a v cesat 0.3 0.9 v base-emitter saturation voltage i b =0.25a,i c =1a v besat 0.9 1.2 v maximum collector current vc=2v icm 0.4 0.45 a power mos section (ft839mb) fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page10 static drain-source on-resistance r ds_on v gs =10v, i ds =0.5a 5.5 ? drain-source breakdown voltage bv dss v gs =0v, i ds =250ua 650 v drain-source leakage current i dss v gs =0v, v ds =650v 10 ua maximum drain current i dmax vd=4v 0.6 0.7 a table 3 fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page11 functional description operating description FT839NB/ft839mb is a cost effective and high-performance ac-dc power supply controller for off-line low power ac-dc applications including battery chargers, adaptors and led lighting. the constant voltage (cv) and constant current (cc) co ntrol are achieved accurately without the secondary feedback circuit. start up control start-up current of ft838nb is very low so that a start-up resistor with high resistance and low-wattage is allowed to supply the start-up power for the controller. the large value startup resistor minimizes the power loss in operations and allows quick start up. with a special fast startup technology, FT839NB/ft839mb starts up easily in capacitive loading applications. operating current the operating current of FT839NB/ft839mb is as low as 500ua. good efficiency is achieved with the low operating current. low operating current also reduces the vcc hold-up capacitance requirement. constant voltage (cv) and constant current (cc) operation the FT839NB/ft839mb can accurately achieve cv/ cc characteristic output without secondary side voltage and current-feedback circuits. it operates in cv mode to regulate the output voltage by capturing the auxiliary winding f eedback voltage at fb pin. the aux iliary winding feedback voltage is proportional to secondary winding, so it provides controller the feedback signal from secondary side and achieves constant-voltage outpu t. in cc mode, the controller detects the secondary discharger peak current and the discharger time, which determines the off-time of the base driver to make the output average current constant. primary peak current modulation primary peak current is constant at constant curr ent mode. and primary peak current is modulated at constant voltage mode for the purposes of good dy namic load response and no audible noise over entire operating range. according to the output loading current the current threshold voltage is modulated from 0.55v to 0.27v. the current threshol d voltage is 0.55v at rated load and 0.27v at light load. leading edge blanking each time the power npn or mos transistor is switched on, a turn-on spike occurs at the sense resistor. to avoid premature termination of the switching pulse, a 400ns leading edge blanking time is built in. conventional rc filtering can therefore be omi tted. during this blanking period, the current limit comparator is disabling and can not switch off the base driver. under voltage lockout (uvlo) FT839NB/ft839mb turn-on vcc_on and turn-off vcc_off are 17.6 v and 6.6 v, respectively. during start-up, the hold-up capacitor must be charged to 17.6v through the start-up resistor. the hold-up capacitor continues to supply vcc until power can be delivered from the auxiliary winding of the fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page12 transformer. vcc must not drop below 6.6 v during this start-up process. this uvlo hysteresis window ensures that hold-up capacitor is suffi cient to supply vcc during start-up. protection control with rich protection features of FT839NB/ft839mb , excellent power supply system reliability can be achieved. the protection features include cycle by cycle current limiting, vcc over voltage protection and clamp, over temperature protection, feedback loop open circuit protection and vcc under voltage lockout, etc. integrated npn/mos power npn/mos is integrated in FT839NB/ft839mb for low cost and/or space limited applications, respectively. output cable compensation the output cable compensation provides a constant output voltage at the end of the cable over the entire load range in constant voltage mode. as the converter load increases from no-load to the peak current load, the voltage drop introduced across th e output cable is compensated by increasing the feedback pin reference voltage. fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page13 package information sop8 package dimensions in millimeters dimensions in inches symbol min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.100 0.185 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.050 bsc l 0.400 1.270 0.016 0.050 0 8 0 8 fmd confidential
fremont micro devices preliminary FT839NB/839mb ? 2013 fremont micro devices inc. confidential rev0.80 ds839nb/mb-a0-page14 fremont micro devices (sz) limited #5-8, 10/f, changhong building, ke-ji nan 12 road, nanshan district, shenzhen, guangdong 518057 tel: (86 755) 86117811 fax: (86 755) 86117810 fremont micro devices (hong kong) limited #16, 16/f, blk b, veristrong industrial centre, 34- 36 au pui wan street, fotan, shatin, hong kong tel: (852) 27811186 fax: (852) 27811144 fremont micro devices (usa), inc. 42982 osgood road fremont, ca 94539 tel: (1-510) 668-1321 fax: (1-510) 226-9918 web site: http://www .fremontmicro.com/ * information furnished is believed to be accurate and reliable. however, fremont micro devices, incorporated (bvi) assumes no responsibility for the consequences of use of su ch information or for any infringement of patents of other rights of third parties which may result from its use. no license is granted by implication or otherwise under any pat ent rights of fremont micro devices, incorporated (bvi). specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. fremont micro devices, incorporated (bvi) products are not authorized for use as critic al components in life support devices or systems without express written ap proval of fremont micro devices, in corporated (bvi). the fmd logo is a registered trademark of fremont micro devices, inco rporated (bvi). all other names are the property of their respective owners. fmd confidential

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