View OB3316_3600063.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 1 - general description OB3316 is a high performance cold cathode fluorescent lamp (ccfl) backlight controller ic dedicated for use in push pull configuration. the controller is designed to drive single or multiple ccfls in liquid crystal display (lcd) applications. OB3316 converts unregulated dc input voltage to the pseudo sinusoidal voltage and current waveforms in required frequency, to ignite and operate ccfl lamps. OB3316 provides a high degree of design flexibility by offering great programmability for key parameters which includes operating frequency, striking frequency, striking time, burst frequency for dimming and soft-start time. OB3316 offers variable dimming controls. both internal burst and external low frequency pwm (lpwm) dimming methods are available for a wide range of dimming control (10% to 100%). further more, analog dimming is provided through external dc input control to achieve 40% to 100% dimming range. the highly integrated OB3316 provides complete protection features covering ic under voltage lockout (uvlo), syst em supply brownout protection, output over voltage protection (ovp) and lamp fail safe functions (lfsf). OB3316 is available in dip16 and sop16 packages. featur es z built-in burst and external lpwm for wide range dimming control z analog dimming control z 0-3v dc voltage direct dimming without any additional components z high precision reference and frequency control z support single or multiple ccfls z flexible user programmability: external programmable constant operating frequency programmable striking frequency and voltage control programmable soft on/off timer programmable striking time control programmable internal burst mode frequency control z comprehensive protection coverage: ic supply under voltage lockout (uvlo) system supply brownout protection output over voltage protection (ovp) lamp fail safe functions (lfsf) applications z lcd monitor z lcd tv z notebook computer z lcd flat panel display for instrument, automobile and handhold device typical application circuit on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 2 - absolute maximum ratings parameter value vdda input voltage to agnd 7v agnd to pgnd +/-0.3v i/o(all pins except pin7, 10, 13) to agnd -0.3 to vdda + 0.3v operating ambient temperature t a 0 to 70 o c operating junction temperature t j 150 o c min/max storage temperature t stg -55 to 150 o c note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditions? is not implied. exposure to absolute maximum-rated cond itions for extended periods may affect device reliability. recommended operating range parameter value vdda voltage 4.5v to 5.5v operating frequency 30 to 150khz package thermal characteristics parameter value thermal resistance ja (sop) 85 o c /w thermal resistance ja (dip) 60 o c /w ordering information part number description OB3316rp dip16, pb-free OB3316qp sop16, pb-free package marking information q: package designator for sop16 p: pb-free package y: year code ww: week code s : in te rn a l t r ac kin g code lt yww OB3316qp s lt yww OB3316rp s r: package designator for dip16 p: pb-free package y: year code ww: week code s: internal tracking code OB3316 x x x high performance ccfl controller ? push pull package package pb free packing r:dip16 q:sop16 blank:normal p:lead-free blank:tube a: taping on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 3 - pin configuration terminal assignment pin number pin name i/o pin function 1 ena input active high. enable control input 2 cmp/sst i/o connected to loop compensation capacitor, this capacitor also sets the soft start time 3 cs input lamp current sense input 4 nc - no connection. keep floating or short to ground in pcb 5 stime i/o connected to capacitor for striking time setting 6 vs input output voltage sense input 7 vdda power power supply 8 gate2 output n mosfet drive output2 9 gate1 output n mosfet drive output1 10 pgnd ground power ground 11 ri i/o connected to resistor setting strike frequency 12 rt i/o connected to resistor setting operating frequency 13 agnd ground analog ground 14 bf/dmod input connected to capacitor setting burst frequency or used for dimming mode selection (dual function input) 15 dim input dimming control signal input 16 svd input system power supply voltage detect input ena 1 cs 3 nc 4 stime 5 vs 6 vdda 7 16 svd 15 dim 14 bf/dmod 13 agnd 12 rt 11 ri 10 pgnd gate2 8 9 gate1 cmp/sst 2 on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 4 - functional block diagram 2 3 14 7 6 1 5 4 15 9 10 11 12 13 ena svd cmp/sst cs stime vdda gate2 gate1 pgnd ri rt nc bf/dmod dim bandgap/reference v_ref i_ref striking voltage regulation & ovp + - 1.0v gate driver output control logic pwm generator dimming control osc system voltage detection (uvlo) + - + - v_ref cs_th input logic vdd uvlo por lamp fail safe functions reference trimming & frequency trimming vs 8 agnd 16 2.6ua timer timer ramp + - v_th clk on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 5 - electrical characteristics vdda=5v, ena=5v, svd=5v, rt=33kohm, ri=110kohm, c cmp =47nf, dim=5v, c stime = 1uf, t a =25 o c if not otherwise noted. parameter symbol condition min typ max unit current consumption operating i vdd vs=cs=1v, cmp=2v, - 2.5 4 ma vdda uvlo uvlo on ramp vdda form 5v to 0v 3.9 v uvlo off ramp vdda form 0v to 5v 4.1 v high frequency oscillator operating frequency f op cs=vs=1.25v, cmp=2v 48 50 52 khz striking frequency f stk vs=cs=0v, cmp=2v - 65 - khz temp. stability ta = 0 o c to 70 o c - 200 - ppm/ o c pwm max. duty - 45 - % low frequency oscillator for burst mode dimming burst frequency c bf =10nf, dim=1.5v 180 200 220 hz temp. stability ta = 0 o c to 70 o c - 400 - ppm/ o c min. burst duty c bf =10nf, dim=0v - 10 - % max. burst duty c bf =10nf, dim=3v - 100 - % analog dimming control minimum lamp current reference voltage bf>3.5v, dim=0v 0.45 0.5 0.55 v maximum lamp current reference voltage bf>3.5v, dim=3v 1.2 1.25 1.3 v external lpwm dimming control external lpwm duty bf<0.5v, dim=lpwm 10 - 100 % high 2.0 - - v external lpwm logic input level low - - 0.8 v error amplifier input voltage range 0 - vdd-1.6 v on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 6 - reference voltage v ref 1.20 1.25 1.30 v open loop voltage gain - 70 - db unity gain bandwidth c cmp = 47nf - 250 - hz supply current soft start current i sst - 3 - ua striking timer current i stime - 2.6 - ua control & protection threshold enable threshold high v ih _ena 2.0 v enable threshold low v il _ena 0.8 v lamp fail safe functions cs threshold v th_ol 300 mv lamp fail safe functions cs deglitch time t_ ol 20 msec ignition completion cs threshold v th_igc 350 mv system under voltage threshold v th_svd 1.20 1.25 1.30 v striking timer threshold v stime 2.6 v vs regulate voltage at strike v th_reg cs=0v 3.0 v vs over voltage threshold at normal operate v th_ov cs=1v 3.0 v gate driver output gate1 r on i sink/isource =70ma - 8 12 ohm gate2 r on i sink/isource =70ma - 8 12 ohm on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 7 - function description high efficiency operation OB3316 drives the push pull power train where transformer couples the energy from the power source to the secondary ccfl load. two switches in the push pull topology are driven alternatively to convert the dc voltage to ac voltage. the resonant frequency of the tank is set by the leakage inductance and the output capacitance in secondary side. the resonant tank produces quasi-sinusoidal voltage and current waveforms for ccfl load with higher efficiency, lower emi and heat dissipation that result in higher system reliability. OB3316 provides a high performance solution with a low system cost. referring to the schematic on page9, reference design for one lamp application is shown. enable the controller OB3316 is activated by applying logic high to the ena input. control is ttl logic compatible. the controller is enabled when the voltage at ena pin is higher than 1.0v. toggling the ena signal resets the state machine hence restarts the inverter. lamp ignition voltage much higher than in normal operation is required to ignite ccfl, especially for aged lamp or in low ambiance temperature condition. the programmable striking frequency, voltage and ignition time set by ri, rt, vs, and stime pins ensure sufficient voltage and time for any ccfl ignition. ri and rt are used to set the oscillator frequency which is close to resonant frequency of the tank at ignition stage thus provide sufficient striking voltage. the output voltage is divided by the capacitive voltage divider and is further rectified. the rectified signal is fed into vs pin and compared with internal 3.0v threshold voltage. consequently, the output voltage is regulated and limited. once the output voltage reaches the maximum level, an internal constant 2.6ua current source starts to charge the capacitor connected to stime pin if voltage at cs pin is less than 350mv. voltage at cs higher than 350mv indicates the lamp been ignited and trigger capacitor at stime to discharge. voltage higher than 2.6v at stime indicates an ignition timeout/failure. under such circumstance, pwm gate outputs are disabled and thus power switches are turned o ff. no energy is further transferred to the ccfl load. capacitor in appropriate value is required to provide sufficient time (typical 1 second) to ignite the lamp. ignition time is approximated as: c[uf] = t(sec) soft start and soft on/off external capacitor connected to cmp/sst pin provides soft start and soft on/off control. at start up, an internal current source starts to charge the capacitor. consequently, voltage at cmp/sst pin increases gradually and so as to the duty cycle of the pwm gate signal. this soft start control helps to reduce the mosfet inrush current and voltage stresses, expand the lamp life. the slope of the soft start t v / can be approximated as: m] ri//rt[koh c 4 . 25 10 3 = t v -6 once lamps are ignited, the capacitor connected to cmp/sst pin performs the loop compensation function. in internal burst mode dimming or external lpwm mode dimming conditions, the voltage ramping up and down at this pin performs a soft on/off control function in each burst cycle. system power supply under voltage lockout OB3316 provides system power under voltage lockout function with svd pin. the system power supply is divided by a resistive voltage divider and fed into svd pin. it is compared with an internal threshold voltage of 1.25v. once svd voltage is lower than 1.25v, the controller stops the energy delivering to the ccfl load if it lasts a period larger than 20ms. OB3316 automatically restarts the operation when the system power supply voltage goes back to the normal operation range. normal operating and striking frequency the operating frequency is determined by the external resistor connected to rt pin. the operating frequency is calculated by the following equation: rt(kohm) 1650 = (khz) f op on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 8 - at ignition stage, ri pin is internally connected to rt pin, therefore external resistor at ri pin is in parallel with the external resistor at rt pin. the striking frequency can be calculated by the following equation: ) kohm ( rt // ri 1650 = (khz) f striking striking control and output voltage regulation OB3316 provides output voltage regulation and clamping to protect the transformer from abnormal high voltage. during start up, transformer output voltage signal is sensed by the capacitive voltage divider and rectified. the signal is brought into the controller through vs pin. when the voltage at vs pin reaches ovp threshold of 3.0v, a timer is activated by charging the external capacitor connected to stime pin. striking sequence starts and output voltage is regulated since vs input is clamped at 3.0v. if no lamp current is sensed after stime voltage reaches 2.6v, the controller assumes striking failure and shuts down the output. during normal operating, if vs voltage reaches threshold of 3.0v, the controller immediately shuts down the inverter. ovp is a latch shutdown and could only be reset by toggling ena pin. lamp fail safe functions during normal operation, if the lamp is removed or damaged, the voltage at cs pin drops to 0v. if cs pin voltage is lower than 300mv and lasts more than 20ms, the inverter is latched shutdown. toggling ena restarts the operation. dimming control three commonly used dimming functions, analog mode dimming, internal burst mode dimming and external lpwm burst dimming functions are available in OB3316 without any extra components. different dimming modes are selected by bf/dmod pin. the lamp brightness is determined by the control signal at dim pin. supply a 5v (>3.5v) voltage to bf/dmod pin to select analog mode dimming. a dc voltage ranging from 0v to 3v at dim pin corresponds to a lamp brightness of approximately 40% to 100%. external lpwm burst dimming mode is selected by shorting bf/dmod pin to ground. OB3316 accepts an external lpwm signal to dim pin with a swing voltage of 0v to >1.5v. the lamp brightness is controlled by the duty cyc le of the lpwm signal. the burst frequency is equal to lpwm frequency. internal burst mode dimming is obtained by connecting a capacitor to bf/dmod pin. a low frequency triangular waveform generator is formed by the capacitor, built-in comparator, internal current source and current sink. the triangular voltage waveform with peak of 3v and valley of 1v at this pin is used for the internal low frequency burst pwm generation. duty cycle so as to lamp brightness is controlled by the analog signal at dim pin. the burst mode dimming frequency f burst is set by the following equation: ) nf ( c 2000 = ) hz ( f bf burst a dc voltage ranging from 0v to 3v at dim pin corresponds to a lamp brightness of approximately 10% to 100%. mode analog internal burst external lpwm bf/dmod >3.5v capacitor <0.5v dim 0-3v 0-3v external lpwm on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 9 - reference application ci rcuit for single lamp vin: 8v typical dim: 3v, max. brightness; 0v, min. brightness ena: disable, 0-0.8v; enable, 2-5v load: 100kohm dummy load on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 10 - package mechanical data: sop16 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 0.007 0.010 d 9.800 10.200 0.386 0.402 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 o 8 o 0 o 8 o d on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 11 - package mechanical data: dip16 dimensions in millimeters dimensions in inches symbol min max min max a 3.710 4.310 0.146 0.170 a1 0.510 0.020 a2 3.200 3.600 0.126 0.142 b 0.380 0.570 0.015 0.022 b1 1.524 (bsc) 0.060 (bsc) c 0.204 0.360 0.008 0.014 d 18.800 19.200 0.740 0.756 e 6.200 6.600 0.244 0.260 e1 7.320 7.920 0.288 0.312 e 2.540 (bsc) 0.100 (bsc) l 3.000 3.600 0.118 0.142 e2 8.400 9.000 0.331 0.354 on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/
OB3316 high performance ccfl controller push pull ? on-bright electronics confidential ob_doc_ds_16a2 - 12 - important notice right to make changes on-bright electronics corp. reserv es the right to make corrections, modifications, enhancements, improvements, and other changes to its products and se rvices at any time and to discontinue any product or service without notice. customer s should obtain the latest relevant information before placing orders and should verify that such information is current and complete. warranty information on-bright electronics corp. warrants performance of it s hardware products to the specifications applicable at the time of sale in accordance with its standa rd warranty. testing and other quality control techniques are used to the extent it deems necessary to s upport this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. on-bright electronics corp. assumes no liability for a pplications assistance or customer product design. customers are responsible for their products and ap plications using on-bright?s components, data sheet and application notes. to minimize the risks asso ciated with customer products and applications, customers should provide adequate design and operating safeguards. life support on-bright electronics corp.?s products are not designed to be used as components in devices intended to support or sustain human life. on-b right electronics corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications. military on-bright electronics corp.?s products are not designed for use in military applications. on-bright electronics corp. will not be held liable for any damages or claims resulting from t he use of its products in military applications. on-bright confidential to bonafide www.datasheet.co.kr datasheet pdf - http://www..net/

▲Up To Search▲

Price & Availability of OB3316

	To Download OB3316 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .