supertex inc. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com hv861 features adjustable output regulation for dimming lamp fade-in/fade-out capability low audible noise 180v pp output voltage for higher brightness 1.5v enable input logic highsingle cell lithium ion compatible one miniature inductor to power both lamps separately adjustable lamp and converter frequencies split supply capability 16-lead qfn package applications dual display cellular phones keypad and lcd backlighting pdas handheld wireless communication products global positioning systems (gps) ?? ? ? ? ? ? ? ? ? ? ? ? ? ? the regulated output voltage is at a nominal value of 90v. the el lamps will therefore see 90v. the two el lamps can be turned on and off using two cmos logic inputs, en1 and en2. the driver is disabled when both en1 and en2 are at logic low. the hv861 has two internal oscillators, a switching mosfet, and two high voltage el lamp driver h-bridges. each driver has its own half bridge common output, com1 and com2, which signi?cantly minimizes the dc offset seen by the el lamp. the frequency for the switching mosfet is set by an external resistor connected between the rsw-osc pin and the supply pin vdd. the el lamp driver frequency is set by an external resistor connected between the rel-osc pin and the vdd pin. an external inductor is connected between the lx and vdd pins or vin for split supply applications. depending upon the el lamp sizes, a 1.0nf to 10.0nf capacitor is connected between the cs and ground. as the switching mosfet charges the external inductor and discharges it into the capacitor at cs, the voltage at cs will start to increase. once the voltage at cs reaches a nominal value of 90v, the switching mosfet is turned off to conserve power. el lamp dimming can be accomplished by applying a pwm logic signal to the pwm pin. the el lamp brightness will be inversely proportional to the pwm duty cycle. the hv861 can also slowly turn the el lamp on/off giving a fade on/ off appearance. typical application circuit dimmable, low noise, dual el lamp driver general description the supertex hv861 is a low noise, dimmable, high voltage, dual el lamp driver designed for driving two electroluminescent (el) lamps with a combined area of 5.0 square inches. the input supply voltage range is from 2.5v to 4.5v. enable input logic high can go as low as 1.5v, which allows logic interface operating from typical 1.8v supplies. the device is designed to minimize audible noise emitted by the el lamps. the device uses a single inductor and a minimum number of passive components. using the internal reference voltage, 100h coilcraft lps4012 3.3m 2.0m 825k v dd = 3.0v 0.1f 2.2f input logic control: on = 1.5 to v dd off = 0 to 0.2v gnd en1 vdd 1 2 3 4 8 7 6 5 9 10 11 12 14 15 16 13 pwm vref en2 rsw-osc rel-osc vreg vout lx cs el1 com1 el2 com2 HV861K7-G el1 el2 3.3nf100v npo 1n4148 4.7f v in = 3.2 to 4.2v downloaded from: http:///
2 hv861 supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com ordering information device 16-lead qfn 3.00x3.00mm body 0.80mm height (max) 0.50mm pitch hv861 HV861K7-G -g indicates package is rohs compliant (green)absolute maximum ratings parameter value v dd , supply voltage -0.5v to 5.5v operating temperature -40c to +85c storage temperature -65c to +150c power dissipation 1.6w v cs , output voltage -0.5v to +120v sym parameter min typ max units conditions electrical characteristics (over recommended operating conditions unless otherwise speci?ed) absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rating level may affect device reliability. all voltages are referenced to device ground. pin con?guration package ja 16-lead qfn 60 c/w thermal resistance r ds(on) on-resistance of switching transistor - - 7.0 ? i = 100ma v cs maximum output regulation voltage 80 90 100 v v dd = 2.5v to 4.5v v cs output regulation voltage - 78 - v v dd = 2.5v to 4.5v, v reg = 1.092v - 62 - v dd = 2.5v to 4.5v, v reg = 0.862v - 45 - v dd = 2.5v to 4.5v, v reg = 0.632v v reg external input voltage range 0 - 1.40 v v dd = 2.5v to 4.5v note: pads are at the bottom of the package. center heat slug is at ground potential. 1 12 2 3 4 5 6 7 8 9 10 11 13 14 15 16 vref vreg vout pwm el1com1 com2 el2 rel-osc rsw-osc vdd en1 en2 gnd lx cs y = last digit of year sealed w = code for week sealed l = lot number = green packaging h861 ywll product marking 16-lead qfn package 16-lead qfn package recommended operating conditions sym parameter min typ max units conditions v dd supply voltage 2.5 - 4.5 v --- f sw switching frequency 40 - 200 khz --- f el el output frequency 100 - 500 hz --- c load total el lamp capacitance load 0 - 20 nf --- t a operating temperature -40 - +85 c --- package may or may not include the following marks: si or downloaded from: http:///
3 hv861 supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com sym parameter min typ max units conditions electrical characteristics (cont.) v refh v ref output high voltage 1.12 1.26 1.40 v v dd = 2.5v to 4.5v i ref(source) average sourcing current from v ref pin - 6.0 - a v dd = 2.5v to 4.5v i ref(sink) average sinking current from v ref pin - 6.0 - a v dd = 2.5v to 4.5v i ddq quiescent v dd supply current - - 300 na v dd = 2.5v, en1 = en2 = pwm = low - - 400 v dd = 3.0v, en1 = en2 = pwm = low - - 500 v dd = 4.5v, en1 = en2 = pwm = low i dd input current going into the v dd pin - - 250 a v dd = 2.5v to 4.5v, r el = 2.0m?, r sw = 825k? i in input current including inductor current - 25 50 ma v in = 3.2v (see test circuit) f el el lamp frequency 160 190 220 hz r el = 2.0m? f sw switching transistor frequency 84 100 116 khz r sw = 825k? pwm input pwm frequency 10 - 100 khz --- d switching transistor duty cycle - 88 - % --- v ih enable pwm input logic high voltage 1.5 - v dd v v dd = 2.5v to 4.5v v il enable pwm input logic low voltage 0 - 0.2 v v dd = 2.5v to 4.5v i ih enable pwm input logic high current - - 1.0 a v ih = v dd = 2.5v to 4.5v i il enable pwm input logic low current - - -1.0 a v il = 0v, v dd = 2.5v to 4.5v c in enable pwm input capacitance - - 15 pf --- function table en1 en2 el1 el2 com1 com2 ic 0 0 hi z hi z hi z hi z off 0 1 hi z on hi z on on 1 0 on hi z on hi z on 1 1 on on on on on typical performance (el1 lamp size = el2 lamp size = 3.6in 2 ) v dd (v) v in (v) lamp i in (ma) v cs (v peak ) f el (hz) lamp brightness (cd/m2) el1 el2 3.0 4.0 el1 on 16.5 93 188 14.0 - el2 on 16.5 - 14.0 el1 and el2 on 29.8 14.0 14.0 downloaded from: http:///
4 hv861 supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com figure 1: block diagram figure 2: test circuit 100h coilcraft lps4012 3.3m 2.0m 825k v dd 0.1f 2.2f input logic control: on = 1.5v to v dd off = 0v to 0.2v gnd en1 v dd 1 2 3 4 8 7 6 5 9 10 11 12 14 15 16 13 pwm vref en2 rsw-osc rel-osc vreg vout lx cs el1 com1 el2 com2 hv861k7 12nf 3.3nf 100v npo 1n4148 4.7f v in 620 620 12nf i in i dd v cs v cs v cs el1 com1 el2 com2 output drivers v sense 1.26v v ref pwm switch oscillator 0 to 88% 2 x el freq. 1 x el freq. cs lx vdd en1 en2 rsw-osc vreg vout gnd rel-osc pwm vref el1 enable el2 enable 60pf c + - downloaded from: http:///
5 hv861 supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com figure 3: typical waveform el1, com1 and differential waveform el1 C com1 split supply con?guration the hv861 can also be used for handheld devices operating from a battery where a regulated voltage is available. this is shown in figure 4. the regulated voltage can be used to run the internal logic of the hv861. the amount of current necessary to run the internal logic is 250a max. therefore, the regulated voltage could easily provide the current with- out being loaded down. enable/disable con?guration el1 and el2 outputs can be enabled and disabled via a logic control signal on the en1 and en2 pins respectively. when en1 is high/low, the lamp1 (el1) will be on/off. when en2 is high/low, the lamp2 (el2) will be on/off. the control signal can be from a microprocessor. el1 el1 - com1 com1 figure 4: split supply and enable/disable con?guration l x r reg r el r sw c dd c ref input logic control:input logic control: gnd en 1 v dd 1 2 3 4 8 7 6 5 9 10 11 12 14 15 16 13 pwm vref en2 rsw-osc rel-osc vreg vout lx cs el1 com1 el2 com2 hv861 el1 el2 c s d battery voltage = v in +_ regulated voltage = v dd +_ c in downloaded from: http:///
6 hv861 supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com pin con?guration and external component description pin # name description 1 rel-osc external resistor from rel-osc to vdd sets the el frequency. the el frequency is inversely pro- portional to the external r el resistor value. reducing the resistor value by a factor of two will result in increasing the el frequency by two. f el = (2.0m? ? 190hz) / r el 2 rsw-osc external resistor from rsw-osc to vdd sets the switch converter frequency. the switch converter frequency is inversely proportional to the external r sw resistor value. reducing the resistor value by a factor of two will result in increasing the switch converter frequency by two.f sw = (825k? ? 100khz) / r sw 3 vdd low voltage input supply pin. 4 en1 enable input signal for el lamp 1. cmos logic input pin. refer to the function table. 5 en2 enable input signal for el lamp 2. cmos logic input pin. refer to the function table. 6 gnd device ground. 7 lx drain of internal switching mosfet. connection for an external inductor. the inductor lx is used to boost the low input voltage by inductive ?yback. when the internal switch is on, the inductor is being charged. when the internal switch is off, the charge stored in the ind uctor will be transferred to the high voltage capacitor c s . the energy stored in the capacitor is connected to the internal h-bridge, and therefore to the el lamp. in general, smaller value inductors, which c an handle more current, are more suitable to drive larger size lamps. as the inductor value decreases, the switching frequency of the inductor (controlled by r sw ) should be increased to avoid saturation. 8 cs connect a 100v capacitor between this pin and ground. this capacitor stores the energy transferred from the inductor. 9 el2 el lamp 2 connection. 10 com2 common connection for el2 lamp. 11 com1 common connection for el1 lamp. 12 el1 el lamp 1 connection. 13 pwm pwm pulse input for el lamp dimming. the duty cycle of the pwm signal is inversely proportional to the output voltage. if pwm dimming is not desired, then the pwm pin should be tied to ground. 14 vout switched internal reference voltage. 15 vreg input voltage to set v cs regulation voltage. this pin allows an external voltage source to control the v cs amplitude. el lamp dimming can be accomplished by varying the input voltage to vreg. the v cs voltage is approximately 71 times the voltage seen on vreg. external resistor connected between vreg and vout pins controls the v cs charging rate. the charging rate is inversely proportional to the resistor value. 16 vref internal reference voltage to set the regulation voltage. connect an external capacitor (c ref ) from vref to ground to slowly brighten the lamp during power-up and dim down the lamp during power- down. the size of the capacitor determines the time taken to brighten up or dim down. if fade-in and fade-out are not required, this pin should be left ?oating. fade in/fade out time = c ref x 210 x 10 3 sec. downloaded from: http:///
supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receive s an adequate product liability indemnification insu rance agreement. supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defect ive due to workmanship. no responsibility is assume d for possible omissions and inaccuracies. circuitr y and specifications are subject to change without notice . for the latest product specifications refer to th e supertex inc. (website: http//www.supertex.com) ?2010 supertex inc. all rights reserved. unauthorized use or reproduct ion is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 tel: 408-222-8888 www.supertex.com 7 hv861 (the package drawing(s) in this data sheet may not re?ect the most current speci?cations. for the la test package outline information go to http://www.supertex.com/packaging.html .) doc.# dsfp-hv861 b032310 16-lead qfn package outline (k7) 3.00x3.00mm body, 0.80mm height (max), 0.50mm pitch symbol a a1 a3 b d d2 e e2 e l l1 dimension (mm) min 0.70 0.00 0.20 ref 0.18 2.85* 1.50 2.85* 1.50 0.50 bsc 0.20 ? 0.00 0 o nom 0.75 0.02 0.25 3.00 1.65 3.00 1.65 0.30 ? - - max 0.80 0.05 0.30 3.15* 1.80 3.15* 1.80 0.45 0.15 14 o jedec registration mo-220, variation weed-4, issue k, june 2006. * this dimension is not speci?ed in the jedec drawing. ? this dimension differs from the jedec drawing. drawings not to scale. supertex doc. #: dspd-16qfnk73x3p050, version c041009. seating plane top view side view bottom view a a1 d e d2 e b e2 a3 l l1 view b view b 1 note 3 note 2 note 1 (index area d/2 x e/2) note 1(index area d/2 x e/2) 16 1 16 notes: a pin 1 identi?er must be located in the index area indicated. the pin 1 identi?er can be: a molded mark/identi?er; an embedded metal marker; or a printed indicator. depending on the method of manufacturing, a maximum of 0.15mm pullback (l1) may be present. the inner tip of the lead may be either rounded or square. 1.2. 3. downloaded from: http:///
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