View HT7L2102_7321657.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

rev. 1.00 1 november 4, 2011 rev. 1.00 pb november 04, 2011 HT7L2102 anti-emi, high effciency dimmable led lighting driver with green mode and integrated protections feature ? frequency jitter for emi restriction ? integrated soft-start function ? very low operating current and start-up current (<20 m a) for satisfying energy-star 2.0 "no-load mode" (stand-by) power standard ? 5% trimmed oscillator for precise frequency ? non-audible-noise green mode control to maintain effciency for both light and heavy loads ? leb (leading-edge blanking) on cs pin ? internal slope compensation ? cycle-by-cycle current limiting ? short-circuit-protection(scp) for short-circuit and over-load condition ? over-voltage-protection(ovp) on vcc pin ? over-temperature-protection(otp) on ts pin for external thermistor sensing ? 1~99% pwm dimming range ? 8-pin sop package applications ? isolation ac-dc led lighting ? ac-dc switching power supply/adapter general description the HT7L2102 is an advanced, highly integrated led lighting driver using an ac-dc isolation topology. the device provides many protection functions and uses ultra low power circuit design, and is optimized to restrict emi. by integrating a non-audible noise green mode control structure, users can implement a single circuit for different led load levels for various series/parallel confgurations but still maintain high efficiency for different load conditions. this device also integrates various protection functions for led lighting requirements such as cycle-by-cycle current limiting, short-circuit protection (scp), over-voltage protection (ovp), over-temperature protection (otp) for external thermistor sensing, and a soft-start function to reduce inrush currents during led power system initialization for the prevention of device burn-out. the HT7L2102 provides a 1~99% pwm dimming range with duty-cycle scale precision lower than 1%. application circuits r 3 r 7 d 4 d 3 r 4 r 19 c 12 gd vcc ts isense comp / fb c 19 gnd rt vref r 11 c 15 d 1 r 20 vout c 14 t 1 q 1 u 2 u 1 c 2 bd 1 vac = 85 v ~ 265 v l n 1 5 4 3 7 8 q 3 c 4 rts r 28
rev. 1.00 2 november 4, 2011 HT7L2102 block diagram pin assignment 32 v uvlo 14 v / 8 v internal bias & vref green mode osc leb 350 ns s r q driver stage vref vcc gd gnd vcc rt fb / pdm isense ts ocp level = 1 v fb compare level = 2 . 5 v slope compensation 3 6 7 2 1 4 5 soft - start frequency jitter otp scp ocp ovp 8 constant current controller temperature sense 107 ua pin description pin no. pin name description 1 fb/pdm voltage feedback pin. connected to a photo-coupler for closed-loop control. this pin also can be used as a pwm dimming pin. 2 ts temperature sense pin. connected to an external thermistor as a sense system hot point. this pin also can be used for an external system-latch. 3 isense a voltage proportional to the inductor current is connected to this input. the constant current controller uses this voltage information to keep the system output current within a narrow range. 4 rt the oscillator frequency is programmed by connecting a resistor rt between this pin and ground. a maximum frequency of 500khz is possible. 5 gnd combined control circuitry and power ground. 6 gd power mosfet gate driver output. 7 vcc positive supply. 8 vref a temperature-independent voltage reference output. absolute maximum ratings supply voltage vcc ................................................................................................................................ -0.3v~30.0v fb/pdm, rt, isense, ts pins ................................................................................................................ -0.3v~5.5v junction temperature .......................................................................................................................................... 150c operating ambient temperature ............................................................................................................... -40c~85c storage temperature range .................................................................................................................... -65c~150c package thermal resistance (8-pin sop) ..................................................................................................... 160c/w esd protection: human body model ...................................................................................................................................... 3kv machine model ........................................................................................................................................... 200v note: these are stress ratings only. stresses exceeding the range specifed under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specifcation is not implied and prolonged exposure to extreme conditions may affect device reliability.

rev. 1.00 3 november 4, 2011 HT7L2102 electrical characteristics unless otherwise stated, this specifcations apply for 0c ta 70c, v cc =15v, rt=10k w symbol parameter test condition min. typ. max. unit supply voltage (vcc pin) i st startup current v cc =12.9v 12 30 m a i cc operating current v fb/pdm =0v 2.0 3.0 ma v fb/pdm =3v 2.5 ma v tl uvlo (off) 7 8 9 v v th uvlo (on) 13 14 15 v v cc ovp trip level v cc (over voltage protection) 26.5 28.0 29.5 v v d-ovp ovp strobe time 100 m s reference section (vref pin) v ref output voltage tj=25c, i o =1ma 5.5 v ?v ref line regulation 12v v cc 25v 3 20 mv ?v ref load regulation 1ma i o 10ma 4 25 mv current sensing (ise nse pin) v is(off) maximum input voltage, vcs(off) 0.9 1.0 1.1 v t leb leading edge blanking time 350 ns delay to output 100 ns oscillator (rt pin) f osc oscillator frequency tj=25c, rt=10k w to gnd 49 52 55 khz ?f osc ?t a temperature stability -40c ~105c 5 % ?f osc ?v ref voltage stability v cc =10v~25v 0.2 1.0 %/v d max maximum duty 75 % frequency jitter 4 % gate drive output (gd pin) v ol output low level v cc =15v, isink=20ma 1 v v oh output high level v cc =15v, isource=20ma 9 v t r rising time tj=25c, load capacitance=1nf 50 150 ns t f falling time tj=25c, load capacitance=1nf 50 150 ns voltage feedback (fb/pdm pin) i sink short circuit current v fb/pdm =0v 1.5 2.2 ma v fb/pdm open loop voltage fb/pdm pin open 5.5 v scp (short circuit protection) v fb/pdm scp trip level v fb/pdm (scp) 4.7 v scp delay time (see note) f s =52khz 75 ms soft-start t start soft-start time rt=10k w 10 ms external otp(over temperature protection, ts pin) v otp-on otp enable trigger level 0.95 1.00 1.05 v v otp-reset otp disable trigger level 1.2 v i ts pull up current source 96 107 118 m a note: these parameters, although guaranteed, are not 100% tested in production.
rev. 1.00 4 november 4, 2011 HT7L2102 typical performance characteristics 11 .5 12 12 .5 13 13 .5 14 14 .5 15 15 .5 - 40 - 20 0 20 40 60 80 100 120 temperature ( degree c ) uvl o (o n )(v) figure 1. uvlo (on) (v) vs. temperature 47 48 49 50 51 52 53 54 55 56 57 - 40 - 20 0 20 40 60 80 100 120 temperature ( degree c ) freq u en cy (khz) figure 3. frequency vs. temperature 4 .4 4. 45 4 .5 4. 55 4 .6 4. 65 4 .7 4. 75 4 .8 4. 85 4 .9 - 40 - 20 0 20 40 60 80 100 120 temperature ( degree c ) vco mp (v) figure 5. v fb/pdm for scp vs. temperature 6 6.5 7 7.5 8 8.5 9 9.5 10 - 40 10 60 110 temperature ( degree c ) uvl o (o ff)(v) figure 2. uvlo (off) (v) vs. temperature 47 48 49 50 51 52 53 54 55 56 57 11 13 15 17 19 21 23 25 vcc (v) frequ e n cy (khz) figure 4. frequency vs. v cc 15 17 19 21 23 25 27 29 31 11 13 15 17 19 21 23 25 vcc (v) gree n m od e freq ue n cy (khz) figure 6. green mode frequency vs. v cc
rev. 1.00 5 november 4, 2011 HT7L2102 application information operation overview the ht7l2012 is a highly functionally integrated pwm controller for led lighting and is optimized to restrict emi. the device offer a dimming precision of less than 1% and has a dimming range of 1% to 99%. its integrated features include green mode (non- acoustic-noise), internal slope compensation, high efficiency under different load conditions within a wide operating temperature range of -40c to 85c. the devices also includes a range of protection functions, scp, ovp, uvlo, current limit, leb, soft start, otp for external thermistor sensing. these features not only enhance system performance, but also ensure high stability of the whole circuit application even under extreme environmental conditions such as high temperature or high emi levels. advanced precision oscillator for green-mode switching and non-acoustic noise requirement a trimmed precision green mode oscillator is implemented in the device to enhance the conversion efficiency under light load conditions. as fig. 7 shows, the efficiency difference between light loads and heavy loads is less than 1%, while the average effciency is only 89.5%, the peak effciency is 90%. figure 7 HT7L2102 effciency performance between light-load and heavy-load the green mode oscillator types supplied by other pwm controller providers are plagued by acoustic- noise problems. this is because, under light load conditions, the frequency will keep decreasing through the human acoustic range (from 20hz to 20khz), and these audio frequencies may create audible noise in the transformer. holteks HT7L2102 patented green mode oscillator designed using an advanced non-acoustic noise structure prevents the generation of frequencies in the audio frequency band, thus eliminating any transformer noise. figure 8. oscillator behavior compared with HT7L2102 and other green mode pwm controller frequency jitter for emi restriction emi restriction is accomplished using a frequency jitter function, which spreads the energy over a wider frequency range than the bandwidth measured by the emi test equipment. an internal frequency jitter circuit changes the switching frequency between +4% and -4% of the central frequency with a period of 4ms. figure 9 frequency jitter function spreads energy over a period to accomplish emi restraining
rev. 1.00 6 november 4, 2011 HT7L2102 under voltage lockout (uvlo) an uvlo comparator is implemented in to ensure that the device is fully functional before the output stage is enabled. as shown in fig. 10, hysteresis is provided to prevent the pwm controller from shutting down during any voltage dips which might occur during startup. the turn-on and turn- off threshold levels are set at 16.0v and 10.0v, respectively. figure 10. uvlo scheme and start-up current current sense and leading-edge blanking (leb) a leading-edge blanking scheme is integrated in the device to prevent false triggering due to feedback current spikes which may appear on the cs pin, further eliminating the need for an r-c filter which is always a requirement in traditional current mode pwm controller applications. figure 11. leb with r-c filter removed internal slope-compensation an important issue with current mode control structures is instability due to sub-harmonic oscillation when the duty-cycle > 50%. to prevent this problem from occurring, a slope-compensation function is always necessary. in traditional currentmode pwm controller application, many external components are necessary to implement a slope-compensation function. however in the HT7L2102, the internal slope-compensation eliminates the need for these external components resulting in a simplifed the application circuit design. short-circuit protection (scp) and over-load protection (olp) to protect all the devices in a system from being damaged due to over load or short circuit conditions, a smart scp function is implemented in the device. here the feedback system will force the voltage loop to move toward a saturation value and then pull up the voltage on the comp pin. whenever the vcomp increases to the scp threshold of 4.7v and remains there for longer than 40ms, the protection scheme will activate and then turn off the gate output to stop the power circuit switching. by using such a protection mechanism, the average input power can be reduced to a very low level so that component temperature and stress can be controlled within safe operating levels. figure 12. scp function behavior
rev. 1.00 7 november 4, 2011 HT7L2102 vcc pin over-voltage protection (ovp) vcc over-voltage protection is integrated in the device to prevent component damage due to over voltage conditions on the vcc pin. the ovp is triggered when vcc reaches 28v and lasts for 100us. the pwm pulses are disabled when ovp is enabled. ts pin over-temperature protection (otp) an over-temperature protection (otp) function is integrated in the device.this function with external thermistor sensing will disable the pwm controller at 1v and supports high a temperature alert and prevents damage occurring in the application circuit. oscillator frequency tuning by choosing an appropriate value of an external resistor between the rt pin and gnd, a suitable operating frequency can be generated. the relationship between the value of rt and the operating frequency is provided in figure 13. figure 13. rt resistor value vs. operating frequency
rev. 1.00 8 november 4, 2011 HT7L2102 package information 8-pin sop (150mil) outline dimensions ms-012 symbol dimensions in inch min. nom. max. a 0.228 D 0.244 b 0.150 D 0.157 c 0.012 D 0.020 c' 0.188 D 0.197 d D D 0.069 e D 0.050 D f 0.004 D 0.010 g 0.016 D 0.050 h 0.007 D 0.010 0 D 8 symbol dimensions in mm min. nom. max. a 5.79 D 6.20 b 3.81 D 3.99 c 0.30 D 0.51 c' 4.78 D 5.00 d D D 1.75 e D 1.27 D f 0.10 D 0.25 g 0.41 D 1.27 h 0.18 D 0.25 0 D 8
rev. 1.00 9 november 4, 2011 HT7L2102 reel dimensions sop 8n (150mil) symbol description dimensions in mm a reel outer diameter 330.01.0 b reel inner diameter 100.01.5 c spindle hole diameter 13.0 +0.5/-0.2 d key slit width 2.00.5 t1 space between flange 12.8 +0.3/-0.2 t2 reel thickness 18.20.2
rev. 1.00 10 november 4, 2011 HT7L2102 carrier tape dimensions

sop 8n (150mil) symbol description dimensions in mm w carrier tape width 12.0 +0.3/-0.1 p cavity pitch 8.00.1 e perforation position 1.750.10 f cavity to perforation (width direction) 5.50.1 d perforation diameter 1.550.1 d1 cavity hole diameter 1.50 +0.25/-0.00 p0 perforation pitch 4.00.1 p1 cavity to perforation (length direction) 2.00.1 a0 cavity length 6.40.1 b0 cavity width 5.20.1 k0 cavity depth 2.10.1 t carrier tape thickness 0.300.05 c cover tape width 9.30.1
rev. 1.00 11 november 4, 2011 HT7L2102 holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales offce) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shenzhen sales offce) 5f, unit a, productivity building, no.5 gaoxin m 2nd road, nanshan district, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor (usa), inc. (north america sales offce) 46729 fremont blvd., fremont, ca 94538, usa tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com copyright ? 2011 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek's products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

▲Up To Search▲

Price & Availability of HT7L2102

	To Download HT7L2102 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .