 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| power&rf 2008 summer bipolar white led flash driver ic ???
( led ???3??? ic TK11896AB1 (fc-16) description the TK11896AB1 type is a step-up dc-dc converte r designed for camera lights of mobile phones and portable equipment, using constant frequency pwm architecture, with the following built in: current re gulator up to 1.0a, a very high current switching transistor (2.0a peak), a very high speed oscillator (1.8mhz), a switch over current detector, a low voltage reference depended on led current, a pwm comparator, open-circuit prot ection and on/off control. the TK11896AB1 can drive one or two high current white leds in series, in a high power flash mode or a low powe r torch mode using the cont pin. in flash mode, safet y timeout function works to avoid led overstress. the device operates with 1.8mhz fixed switching frequency to allow for the use of small external components. the operating supply voltage rang e is 2.5v~5.5v. the white leds are connected in series and driven at a constant current, resulting in uniform brightness and high efficiency. the built-in zener diode can be used for open-circuit protection in case the output load is disconnected, such as the string of leds opened. the TK11896AB1 is very small 16 bump flip chip. TK11896AB1 ??x 3 ?2z
( led y????; w pwm m y dc-dc ??? ic pb{ 1.0a w ?v s?z 2.0a peak w?????????z 1.8mhz w
c s?z??? ?v mvs?z led ?vt? b?, j ? ys?z pwm ???s?z led |??-s?z on/off ; ? o `om?b{ TK11896AB1 x ? ? p 1 n?hx 2 nw ( led ?? ?d pb{???? ?? z?t??z???3t??q ???t??w ~??qud pb{???3t?? xz led w|????wyh?z????; u ?v?b{ ????? * t :x 1.8mhz q? s?z ? ? ?u?; pv?b{ ?o ?y 2.5 ? 5.5v p ?^`?b{?hz y ?^t?? ( led ? ? z ?v? ?? rpzk s?u ?sxz? ?pp ?^`?b{ |??-;????|??xz led u??o ?y| ?? y 6tslh ?w z? ?y ? mv`?b{ TK11896AB1 xz 16 bump ???????;`os? ?b{ features ? can drive 2 high current leds in series ? led 2 n? ?d ? independently set flash/torch currents and shutdown ? ?v ~?q; o ? built in safety timeout (flash mode) ? ????a?3??; o ? total solution size 30mm 2 or less ? ??-?3??? ? u 30mm 2 ? high frequency 1.8mhz pwm operation. ? ? ?^ * t : 1.8mhz ? built in current regulator ? ?vs? o ? led disconnect during shutdown ? 3????? led ??? ~ ? ? over voltage protection (ovp) ? ovp -; o ? uses small inductor ? ????;d ? internal switching transistor (max 2.0a) ? ????????? o (max 2.0a) ? very small 16-bump flip chip ? 2.15 2.15mm, 16-bump ????? absolute maximum ratings parameter symbol g? rating unit o? remarks ?? operating voltage range ?^ ?y c? v op 2.5 to 5.5 v operating temperature range ?^9 s c? t op -30 to +85 ? c power dissipation ?0 ? ? ?? p d 1000 mw *on pcb , x? operating frequency range ?^ * t : c? f op to 2.1 mhz power&rf 2008 summer electrical charcteristics t a =25 ? c value parameter symbol g? min. typ. max. unit o? conditions e oscillator section c + ? operating frequency ?^ * t : f 1.5 1.8 2.1 mhz the output led current led z? z? flash mode ???3t? ? i flash 450 500 550 ma v cont =3v torch mode ???t? ? i torch 86 95 104 ma v cont =0v dead time control section s-8 e t ? maximum duty cycle 7 g??a??? ? d max 85 90 95 % v fb =0v cont section (cont pin) ???? ? (cont z? ) input voltage + cont z? ???? ? y v cont,high 1.2 - 5.5 v flash mode input voltage - cont z? ??? ? y v cont,low 0 - 0.3 v torch mode input bias current cont z? ?? ? v i contin - 44 100 ? a v cont =3v shutdown section (en pin) 3????? ? (en z? ) input voltage + en z? ???? ? y v en,high 1.2 - 5.5 v on mode input voltage - en z? ??? ? y v en,low 0 - 0.3 v shutdown mode input bias current en z? ?? ? v i enin - 30 60 ? a v en =3v output switch section (sw pin) z???? ? (sw z? ) switch current limit ??? ?v m v i sw,limit 2.0 3.3 - a switch saturation voltage 1 ???^ ?y 1 v sw,sat1 - 0.05 0.20 v i sw =200ma switch saturation voltage 2 ???^ ?y 2 v sw,sat2 - 0.13 0.50 v i sw =500ma switch leakage current ?????? ? v i sw,off - 0.10 2.0 ? a v fb =1v, v sw =10v open circuit protection section led |??-s? (ovp z? ) ovp voltage ovp ? y v ovp 10.5 12.5 14.5 v error amplifier section (v fb1 pin, ea out pin) ???? ? (v fb1 z? , ea out z? ) input voltage + ?3??? ?y 1 v ea1 - 420 - mv i led =500ma input voltage - ?3??? ?y 2 v ea2 - 180 - mv i led =95ma safety timer section (st pin) ??a???? ? (st z? ) threshold voltage 1 ?3??? ? y v st 0.95 1.0 1.05 v threshold voltage 2 f ? ? v i st -1.2 -1.6 -2.0 ? a v cont =3v v in section (v in pin) ?o ?y ? (v in z? ) low voltage stop ? ?? - ? y v in,low - 2.2 2.4 v quiescent supply current 1 i- ?^ ? ? ?v 1i in,on1 13.6 19.5 25.4 ma v fb =1v, no load v cont =3v(flash mode) quiescent supply current 2 i- ?^ ? ? ?v 2 i in,on2 8.7 12.5 16.3 ma v fb =1v, no load v cont =0v(torch mode) shutdown supply current 3????? ? v i in,off - 0.01 1.0 ? a v en =0v block diagram a3 oscillator ea out a4 c1 v in error amp pwm comp d4 sw b1 v fb c ea over current detector st v in c in sbd cout i set1 r set1 cont en i set2 r set2 l open circuit protection ovp d2 gnd d3 d1 c st current regurator low voltage reference a2 output driver control thermal shutdown safety timer led circuit control uvlo bias a1 c4 c3 c2 b3 b2 b4 white led a3 b4 c4 d4 a1 b1 c1 d1 a4 a2 d3 d2 b3 c2 b2 c3 cont en v in sw sw gnd gnd gnd i set1 st ea out v fb v fb ovp i set2 gnd |
Price & Availability of TK11896AB1
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |