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________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 1 / 13 u m1360 hysteretic buck high brightness led driver with internal switch um1360y sot89 - 5 general description the um1360 is a pwm step - down converter with internal power switch , designed for driving single or multiple series connected leds efficiently from a volta ge source higher than the led voltage. the um1360 can dri ve up to 10 series connected leds . the device operates from an input supply between 6v and 40 v and employs hysteretic control with a high side current sense resistor to set the co nstant output curren t up to 1a. the device is well suited for applications requiring a wide input range . t he high side current sensing and an integrated current sensing circuitry minimize the number of external components while delivering an accurate average output current. d epending upon supply voltage and external components, this device can provide up to 30 watts of output power. output current can be adjusted below the set value, by applying an external control signal to the vset pin. the vset pin will accept either a dc v oltage or a pwm waveform. dedicated pulse width modulation (pwm) input enables pulsed led dimming over a wide range of brightness levels. a hysteretic control method ensures excellent input supply rejection and fast response during load transients and pwm dimming. applying a voltage of 0.2v or lower to the vset pin turns the output off and switches the device into a low current standby state. the um1360 employs spread spectrum technique to greatly reduce its interference to other part of the system. the um1 360 comes in small sot89 - 5 package . it is ideal for industrial and general lighting applications. applications features ? low v oltage h alogen r eplac ement leds ? low v oltage i ndustrial l ighting ? led b ack - s ide l ighting ? illuminated s igns ? dc/dc or ac/dc led d r iver a pplication ? general p urpose , c onstant c urrent s ource ? hysteretic c ontrol with h igh s ide c urrent s ensing ? inte grated 40 v 0. 5 ndmos ? up to 9 8 % e fficiency ? wide i nput v oltage r ange: 6v to 40 v ? 5 0v t ransient c apability ? 5% led c urrent a ccuracy ? adjustable c onstant led c urrent ? single p in o n/ o ff and b rightness c ontrol using dc v oltage or pwm ? s pread spectrum driver ? over t emperature , o p en c ircuit led p rotection ? up to 1mhz s witching f requency ? pb - f ree sot89 - 5 p ackage
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 2 / 13 u m1360 pin configurations top view o rdering information part num ber packaging type marking code s hipping qty um1360y sot89 - 5 um1360y 1 000 pcs/ 7 i nch tape & reel pin description pin number symbol function 1 lx drain of ndmos switch. 2 gnd ground (0v). 3 vset multi - function on/off and brightness control pin: ? leave f loating for normal operation . ? drive to voltage below 0.2v to turn off output current . ? drive with dc voltage (0.3v< v set <2.5v) to adjust output current from 12% to 100% of i out nom . ? drive with pwm signal to adjust output current. adjustment range 1% to 100% o f i out nom for f 1khz. 4 isense connect resistor r s from this pin to vin to define nominal average output current i out nom=0.1/r s . 5 vin input voltage (6v to 40 v). decouple to ground with 10f or higher x7r ceramic capacitor close to device. xx: week code um1360y sot89 - 5 1 2 3 4 5 l x g n d v s e t i s e n s e v i n g n d 1 2 3 4 5 u m 1 3 6 0 y x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 3 / 13 u m1360 absolute maxim u m ratings o ver operating free - air temperature (unless otherwise noted) ( note 1) s ymbol p arameter v alue u nit v in input voltage range - 0.3 to + 40 v v lx , v isense voltages on lx, isense - 0.3 to + 40 v v set vset pin voltage - 0.3 to +6 v j a thermal resistance (junctio n to ambient) 100 c /w t j maximum junction temperature +1 5 0 c t stg storage temperature range - 5 5 to + 1 5 0 c t l maximum lead temperature for soldering 5 s econds + 30 0 c note 1: these are stress ratings only and functional operation is not implied. exp osure to absolute maximum ratings for prolonged time periods may affect device reliability. all voltage values are with respect to network ground terminal. recommended operating conditions symbol parameter min typ max unit v in input voltage range 6.0 4 0 v t a operating ambient temperature - 40 85 c t j operating junction temperature - 40 1 50 c
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 4 / 13 u m1360 electrical characteristics ( v in = 16 v, t a = 25c , unless otherwise noted) symbol parameter test c onditions m in t yp m ax u nit v in input voltage range 6 40 v i l ed output current r s =0.3 3 s =0. 1 q quiescent current without s witching vset p in f loating, v in = 16 v 430 a sd shutdown current vset=gnd, v in =16v 35 70 a sense mean c urrent s ense t hreshold v oltage measured on isense p in with r espect to vin 95 100 105 mv v sense_hys sense t hreshold h ysteresis 1 5 % i sense isense p in i nput c urrent v sense =v in - 0.1 20 a en v set r ange on vset p in for dc d imming 0.3 2.5 v v enon dc v oltage on vset p in to e nable v en r ising 0.25 v v enoff dc v oltage on vset p in to d isable v en f alling 0.2 v r lx lx switch on r esistance i lx = 1000ma 0. 5 lx(leak) lx s witch l eakage c urrent 5 a lx operating f requency v in = 16v, l 1 =47h, out =9.6 v (3 leds), r s =0.1 lxmax recommended m aximum s witch f requency 1.0 m hz t on_rec (note 2) recommended m inimum s witch on t ime for 4% a ccuracy 500 ns max d uty c ycle 100 % d lx recommended d uty c ycle r ange 25 75 % t p d (note 2) internal c omparator p ropagation d elay 500 ns t otp over t emperature p rotection 150 c t otp_h ys temperature p rotection h yster e sis 40 c i lxmax peak switch current 1.5 a i l xmean continuous switch current 1.0 a note 2 : parameters are not tested at production , but guaranteed by design.
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 5 / 13 u m1360 function block diagram typical application circuit d 1 r s l 1 v i n i s e n s e l e d v s e t g n d c 1 v i n e n v s e t b g r e g u l a t o r g m r 2 r 1 i l i m i t o t p l o w v o l t a g e d e t e c t o r l x i n t e r n a l e n a b l e l o g i c & d r i v e r r e f d 1 r s 0 . 3 3 l 1 1 0 0 h 1 0 f c 1 f l o a t i n g v i n ( 6 v - 4 0 v ) v i n v s e t i s e n s e l x u m 1 3 6 0
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 6 / 13 u m1360 ty pical operating characteristics efficiency vs. v in ( l1=100 h, rs=0.33 ) efficiency vs. v in ( l1=47 h, rs=0.15 ) efficiency vs. v in ( l1=33 h, rs=0.1 ) quiescent current vs. input voltage shutdown current vs. input v oltage 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led 1led 2led 3led 4led 5led 6led 7le d 8led 9led 10led output current vs. v in (l1= 100 h, rs=0. 33 ) 0 10 20 30 40 50 60 0 5 10 15 20 25 30 35 40 shutdown current ( shutdown current vs. input voltage 380 410 440 470 500 530 0 5 10 15 20 25 30 35 40 quiescent current ( quiescent current vs. input voltage 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 ef f iciency (%) v in (v) efficiency vs.vin (rs=0.33 , l=100uh) 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 ef f iciency (%) v in (v) efficiency vs.vin (rs=0.15 , l=47uh) 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 ef f iciency (%) v in (v) efficiency vs.vin (rs=0.1 , l=33uh) 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led 250 260 270 280 290 300 310 320 330 340 350 0 5 10 15 20 25 30 35 40 output current (%) v in (v) output current vs.vin (rs=0.33 , l=100uh) 1led 2led 3led 4led 5led 6led 7led 8led 9led 10led
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 7 / 13 u m1360 typical operating characteristics (continued) led current vs. v set duty cycle (v in =16v, 3 leds, l1= 33 h, rs=0. 1 ) led current vs. v set (v in =16v, 3 leds, l1= 33 h, rs=0. 1 ) feedback voltage vs. v in output current vs. temperature (l 1 =33 h, rs=0.1 ) output current change vs. temperature (l 1 =47 h, rs=0.33 ) pwm=1 k hz v in =16v, 3 leds v in =16v, 3 leds 0 100 200 300 400 500 600 700 800 900 1000 1100 0 10 20 30 40 50 60 70 80 90 100 i led (ma) duty cycle (%) led current vs vset duty cycle (vin=16v,3leds,33uh,rs=0.1 ) 0 100 200 300 400 500 600 700 800 900 1000 1100 0 0.5 1 1.5 2 2.5 3 i led (ma) v set (v) led current vs vset (vin=16v,3leds,33uh,rs=0.1 ) 0 20 40 60 80 100 120 140 160 0 5 10 15 20 25 30 35 40 45 sense threshold voltage (mv) input voltage (v) feedback voltage vs vin 800 820 840 860 880 900 920 940 960 - 40 - 20 0 20 40 60 80 100 120 140 output current ( ma ) temperature ( c) output current vs. temperature (l= 33h , rs=0.1) - 50 - 40 - 30 - 20 - 10 0 10 20 30 40 50 - 40 - 20 0 20 40 60 80 100 120 140 deviation from nominal set value (%) temperature ( c) output current c hange vs. temperature (l= 47h , rs=0.33) in =16v, 3 leds
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 8 / 13 u m1360 typical operating characteristics (continued) lx i le d 5 v/div 100ma/div v set i led 2v/div 500ma/div pwm i led 5 v/div 100ma/div steady state waveforms (v in =16v, 3 leds, l 1 = 100h, rs=0.33) start u p waveforms dimming waveforms (pwm=50%, v in =16v, 3 leds, l 1 = 100 h, rs=0.33 ) 2s/div 1ms /div 100% duty cycle mode ( v in =10v, 3 leds, l 1 = 100 h, rs=0.33 ) 2 v/div 2 00ma/div 1ms /div lx i led 10s/div 500khz/div hopping switching frequency waveform spectrum of the um1360 (v in =16v, 3 leds, l 1 =100 h, i out =1a) 2 0db/ div 0hz 0db 500khz/div fixed switching frequency waveform spectrum of competitor (v in =16v, 3 leds, l 1 =100 h, i out =1a) 2 0db/ div 0hz 0 db
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 9 / 13 u m1360 applications information setting n ominal a verage o utput c urrent with e xternal r esistor r s the nominal av erage output current in the led(s) is determined by the value of the external current sense resistor (r s ) connected between vin and isense and is given by: i outnom =0.1/ r s [ for r s 0.1 ] the table below gives values of nominal average output current for seve ral preferred values of current setting resistor (rs) in the typical application circuit as shown on page 5. rs ( ) nominal average output current (ma) 0.1 1000 0.13 760 0.15 667 0.3 333 th e above values assume that the vset pin is float ing or appli ed with a voltage higher than 2.5v (must be less than 5v). note that rs =0.1 is the minimum allowed value of sense resistor under these conditions to maintain switch current below the specified maximum value. it is possible to use different values of rs if the vset pin is driven from an external voltage. (see next section). output c urrent a djustment by e xternal dc c ontrol v oltage the vset pin can be driven by an external dc voltage (v en ), as shown, to adjust the output current to a value below the nominal average value defined by rs. the average output current is given by: i out = (0.1* v en ) / (2.5* rs ) [for 0.3 v ________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 10 / 13 u m1360 i out =(0. 1*d)/r s (0 d 100%, 2.5v < v pulse < 5v) i out =(v pulse *0.1*d)/ ( 2.5*r s ) (0 d 100%, 0.5v < v pulse < 2.5v) pwm dimming provides reduced brightness by modulating the leds forward current between 0% and 100%. the led brightness is contro lled by adjusting the relative ratios of the on time to the off time. a 25% brightness level is achieved by turning the led on at full current for 25% of one cycle. to ensure this switching process between on and off state is invisible by human eyes, the s witching frequency must be greater than 100hz. when a bove 100 hz, the human eyes average the on and off times, seeing only an effective brightness that is proportional to the leds on - time duty cycle. the advantage of pwm dimming is that the forward current is always constant , therefore the led color does not vary with brightness as it does with analog dimming. pulsing the current provides precise brightness control while preserving the color purity. capacitor s election a low esr capacitor should be used f or input decoupling, as the esr of this capacitor appears in series with the supply source impedance and lowers overall efficiency. this capacitor has to supply the relatively high peak current to the coil and smooth the current ripple on the input supply. a minimum value of 4.7f is acceptable if the input source is close to the device, but higher values will improve performance at lower input voltages, especially when the source impedance is high. the input capacitor should be placed as close as possible to the ic. for maximum stability over temperature and voltage, capacitors with x7r, x5r, or better dielectric are recommended. capacitors with y5v dielectric are not suitable for decoupling in this application and should not be used. inductor s election r ecommended inductor values for the um1360 are in the range 27 h to 220 h . higher values of inductance are recommended at higher supply voltages in order to minimize errors due to switching delays, which result in increased ripple and lower efficiency. higher values of inductance also result in a smaller change in ou tput current over the supply voltage range. the inductor should be mounted as close to the device as possible with low resistance connections to the lx and vin pins. the chosen coil should have a saturation current higher than the peak output current and a continuous current rating above the required mean output current. suitable coils for the um1360 are listed in the table below : d 1 r s 0 . 1 3 l 1 6 8 h 1 0 f c 1 v i n ( 6 v - 4 0 v ) v i n v s e t i s e n s e l x u m 1 3 6 0 l e d 3 w
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 11 / 13 u m1360 load c urrent inductor saturation c urrent i out >1a 27 - 47 h 1.3 - 1.5 t imes of l oad c urrent 0.8a744066330 33 1038 92 1800 wrth elektronik www.we - online.com 7447714470 47 1050 8 2.5 2.5 7447714680 68 1050 110 2200 7447714101 100 1050 165 1800 the inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off' times within the specified limits over the supply voltage and load current range. the followi ng equations can be used as a guide. lx switch 'on' time t on = ( l 1 *i ) / ( v in - v led - i led *( r s + r l +r lx )) lx switch 'off' time t off = ( l 1 *i ) / ( v led +v d + i led *( r s + r l )) where: l 1 is the coil inductance (h) . r l is the coil resistance () . r s is the current sense resistance () . i led is the required led current (a) . i is the coil peak - peak ripple cur rent (a) { i nternally set to 0.3 i led } . v in is the supply voltage (v) . v led is the total led forward voltage (v) . r lx is the switch resistance () {= 0. 5 nominal} . v d is the diode forward voltage at the required load current (v) . diode s ele ction for maximum efficiency and performance, the rectifier (d1) should be a fast low capacitance schottky diode with low reverse leakage at the maximum operating voltage and temperature. they also provide better efficiency than silicon diodes, due to a c ombination of lower forward voltage and reduced recovery time. it is important to select parts with a peak current rating above the peak coil current and a continuous current rating higher than the maximum output load current. it is very important to consider the reverse leakage of the diode when operating above 85c. excess leakage will increase the power dissipation in the device and if close to the load may create a thermal runaway condition. the higher forward voltage and overshoot due to reverse recovery time in silicon diodes will increase the peak voltage on the lx output. if a silicon diode is used, care should be taken to ensure that the total voltage appearing on the lx pin including supply ripple, does not exceed the specified maximum value . pcb layout guidelines careful pcb layout is critical to achieve low switching losses and stable operation. minimize ground noise by connecting high current ground returns, the input bypass capacitor ground lead, and the output filter ground lead to a si ngle point . place rs as close as possible to the i sense and vin. for better noise immunity, a kelvin connection is strongly recommended between i sense and rs .
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 12 / 13 u m1360 package information u m1360y sot89 - 5 outline drawing dimensions sym bol millimeters inches min typ max min typ max a 1.40 1.50 1.60 0.05 5 0.059 0.06 3 b 0.3 2 - 0.54 0.01 3 - 0.02 1 b1 0. 38 - 0.62 0.01 5 - 0.02 4 c 0.35 - 0.44 0.014 - 0.01 7 d 4.40 4.50 4.60 0.17 3 0.177 0.18 1 d1 1. 40 - 1.83 0.05 5 - 0.07 2 e 2.3 0 2.50 2.60 0.09 1 0.098 0.10 2 e 1.50typ 0.0 59 typ l 0.65 - 1. 2 0 0.026 - 0.04 7 land pattern notes: 1. compound dimension: 4.50 2.50 ; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation e n d v i e w t o p v i e w d 1 l r 0 . 2 0 0 e e b 1 b l c 8 ( 4 x ) d a s i d e v i e w p i n # 1 i d 1 . 8 0 0 . 6 0 1 . 6 0 0 . 7 5 1 . 5 0 3 . 1 0 1 . 6 0 5 . 3 5 4 . 5 0 4 . 5 5 u m 1 3 6 0 y x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 apr . 201 6 13 / 13 u m1360 green compliance union semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. all union components are compliant with the rohs directive, which helps to support customers in their compliance with environmental directives. for more green compliance information, please visit: http://www.union - ic.com/index.aspx?cat_code=rohsdeclaration important notice the information in this document has been carefully reviewed and is believed to be accurate. nonetheless, this document is subject to change without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union reserves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add: unit 606, no.570 shengxia road, shanghai 2012 10 tel: 021 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

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