supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com supertex inc. hv823 high voltage el lamp driver ic features processed with hvcmos ? tech nology 2.0 to 9.5v operating supply voltage dc to ac conversion 180v peak-to-peak typical output voltage large output load capability typically 50nf permits the use of high-resistance elastomeric lamp components adjustable output lamp frequency to control lamp color, lamp life, and power consumption adjustable converter frequency to eliminate harmonics and optimize power consumption enable/disable function low current draw under no load condition applications hand held personal computers electronic personal organizers gps units pagers cellular phones portable instrumentation ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? general description the supe rtex hv823 is a high-voltage driver designed for driving el lamps of up to 50nf. el lamps greater than 50nf can be driven for applications not requiring high brightness. the input supply voltage range is from 2.0v to 9.5v. the device uses a single inductor and a minimum number of passive components. the nominal regulated output voltage that is applied to the el lamp is 90v. the chip can be enabled by connecting the resistors on the rsw-osc pin and the rel-osc pin to the vdd pin, and disabled when connected to gnd. the hv823 has two internal oscillators, a switching mosfet and a high-voltage el lamp driver. the frequency of the switching converter mosfet is set by an external resistor connected between the rsw- osc pin and the vdd supply pin. 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 pin and the vdd pin. a 0.01f to 0.1f capacitor is connected between the cs pin and the gnd. the el lamp is connected between the va and vb pins. the switching mosfet charges the external inductor and discharg - es it into the c s capacitor. the voltage at c s will start to increase. once the voltage at c s reaches a nominal value of 90v, the switch - ing mosfet is turned off to conserve power. the output pins va and vb are con?gured as an h-bridge and are switched in opposite states to achieve 180v peak-to-peak across the el lamp. for additional information, see application notes an-h33 and an-h34. block diagram c + _ disable gnd vdd rel-osc va cs lx vb rsw -osc enable * * enable is available in die form only . output osc q q q q v ref switch osc
2 supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com hv823 absolute maximum ratings ordering information -g indicates the package is rohs compliant - green device 8-lead soic 4.90x3.90mm body 1.5mm height (max) 1.2mm pitch hv823 HV823LG-G parameter value supply voltage, v dd -0.5 to +10v output voltage, v cs -0.5 to +120v power dissipation 400mw storage temperature -65 o c to +150 o c operating temperature -25 o c to +85 o c stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the speci?cations is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. all voltages referenced to ground. note: all voltages referenced to gnd. recommended operating conditions sym parameter min typ max unit conditions v dd supply voltage 2.0 - 9.5 v --- t a operating temperature -25 - +85 o c --- dc electrical characteristics (v in = 3.0v, r sw = 750k, r el = 2.0m, t a = 25c unless otherwise speci?ed) sym parameter min typ max unit conditions r ds(on) on resistance of switching transistor - 2.0 6.0 i = 100ma v cs output voltage v cs regulation 80 90 100 v v in = 2.0v to 9.5v v a - v b output peak-to-peak voltage 160 180 200 v v in = 2.0v to 9.5v i ddq quiescent v dd supply current, disabled - 30 100 na r sw-osc = low i dd v dd supply current - 150 200 a v in = 3.0v. see fig.1 - - 300 a v in = 5.0v. see fig.2 - - 500 a v in = 9.0v. see fig.3 i in input current including inductor current - 25 33 ma v in = 3.0v. see fig.1 v cs output voltage on v cs 60 70 85 v v in = 3.0v. see fig.1 f el v a - v b output drive frequency 330 380 450 hz v in = 3.0v. see fig.1 f sw inductor switching frequency 50 60 70 khz v in = 3.0v. see fig.1 d switching transistor duty cycle - 88 - % --- pin con?guration 1 2 3 4 8 7 6 5 vdd rsw -osc cs lx 8-lead soic (top view) rel-osc va vb gnd product marking y = last digit of year sealed ww = week sealed l = lot number = green packaging yww hv823 llll 8-lead soic (lg) 8-lead soic (lg) (top view) package may or may not include the following marks: si or
3 supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com hv823 fig. 1: test circuit, v in = 3.0v (ow input current with moderate output brightness) v dd = v in = 3.0v on = v dd off = 0v 0.1f 100v 0.1f 2 560h 1 1n4148 750k 2.0m 2.0k 10nf equivalent to 3 square inch lamp. hv823 1 7 2 3 4 8 6 5 lx gnd vb va rel-osc vdd rsw -osc cs typical performance lamp size v in i in v cs f el brightness 3.0in 2 3.0v 25ma 65v 385hz 6.5ft-lm notes: urata part # h4n5104 (d resistance 14.5) arger values may be reuired depending upon supply impedance. 1. 2. typical performance curves for fig. 1 using 3.0in 2 el lamp 1 2 3 4 5 6 7 8 9 0 5 10 15 20 25 30 40 50 60 70 80 90 0 5 10 15 20 25 30 1 2 3 4 5 6 7 8 9 0 2 4 6 8 10 12 1 2 3 4 5 6 7 8 9 40 50 60 70 80 90 100 250 400 550 700 850 1000 90 80 70 60 50 40 30 20 10 0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 inductor v alue (h) i in , v cs , brightness vs. inductor v alue i in (ma), v cs (v) brightness (ft-im ) brightness (ft-lm ) i in (ma) v cs (v) i in (ma) brightness (ft-im ) i in (ma) v in (v) v in (v) v cs (v) brightness vs. v in i in vs. v in i in vs. v cs (v) v cs (v) v in (v) v cs vs. v in for additional information, see application notes an-h33 and an-h34.
4 supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com hv823 fig. 2: typical 5.0v application v dd = v in = 5.0v 0.01f 100v 1.0nf 16v 560h 1 1n4148 750k 2.0m 3.1k 20nf on = v dd off = 0v 0.1f 2 equivalent to 6 square inch lamp hv823 1 7 2 3 4 8 6 5 lx gnd vb va rel-osc vdd rsw -osc cs typical performance lamp size v in i in v cs f el brightness 6.0in 2 5.0v 25ma 75v 380hz 6.5ft-lm notes: urata part # h4n5104 (d resistance 14.5) arger values may be reuired depending upon supply impedance. 1. 2. typical performance curves for fig. 2 using 6.0in 2 el lamp 90 85 80 75 70 65 5 4 7 8 6 8.0 7.5 7.0 6.5 6.0 5.5 5 4 7 8 6 40 38 36 34 32 30 5 4 7 8 6 40 38 36 34 32 30 70 80 85 90 75 i in (ma) brightness (ft-im) i in (ma) v in (v) v in (v) v cs (v) brightness vs. v in i in vs. v in i in vs. v cs (v) v cs (v) v in (v) v cs vs. v in for additional information, see application notes an-h33 and an-h34.
5 supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com hv823 fig. 3: typical 9.0v application v dd = v in = 9.0v 0.01f 100v 1.0nf 16v 560h 1 1n4148 330k 2.0m 4.9k 42nf 0.1f 2 equivalent t o 12 square inch lamp hv823 1 7 2 3 4 8 6 5 lx gnd vb va rel-osc vdd rsw -osc cs typical performance lamp size v in i in v cs f el brightness 12.0in 2 9.0v 30ma 75v 380hz 8.5ft-lm notes: 1. urata part # h4n5104 (d resistance 14.5) 2. arger values may be reuired depending upon supply impedance. typical performance curves for fig. 3 using 12.0in 2 el lamp 85 80 75 70 65 5 4 7 8 6 8.0 7.5 7.0 6.5 6.0 5.5 5 4 7 8 6 40 38 36 34 32 30 5 4 7 8 6 40 38 36 34 32 30 70 80 85 90 75 v cs (v) i in (ma) brightness (ft-im) i in (ma) v in (v) v in (v) v in (v) v cs (v) v cs vs. v in brightness vs. v in i in vs. v in i in vs. v cs (v) for additional information, see application notes an-h33 and an-h34.
6 supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com hv823 fig. 4: enable/disable con?guration v in = v dd on = v dd off = 0v c s 100v 4.7f 15v 1.0nf l x 1n4148 r sw r el el lamp + - remote enable hv823 1 7 2 3 4 8 6 5 lx gnd vb va rel-osc vdd rsw -osc cs the hv823 can be easily enabled and disabled via a logic control signal on the r sw and r el resistors as shown in fig. 4. the control signal can be from a microprocessor. r sw and r el are typically very high values, therefore, only 10s of microamperes will be drawn from the logic signal when it is at a logic high (enable) state. when the microprocessor signal is high the device is enabled and when the signal is low, it is disabled. enable/disable con?guration fig. 5: split supply con?guration v in = battery vo ltage v dd = regulated vo ltage c s 100v 0.1f* l x 1n4148 r sw r el el lamp + - remote enable on = v dd off = 0 hv823 1 7 2 3 4 8 6 5 lx gnd vb va rel-osc vdd rsw -osc cs the hv823 can also be used for handheld devices operating from a single cell 1.5v battery where a regulated voltage is available. this is shown in fig. 5. the regulated voltage can be used to run the internal logic of the hv823. the amount of current necessary to run the internal logic is typically 100a at a v dd of 3.0v. therefore, the regulated voltage could easily provide the current without being loaded down. the hv823 used in this con?guration can also be enabled/disabled via logic control signal on the r sw and r el resistors as shown in fig. 4. split supply con?guration using a single cell (1.5v) battery fig. 5 can also be used with high battery voltages, such as 12v, as long as the input voltage, v dd , to the hv823 device is within its speci?cations of 2.0v to 9.5v. split supply con?guration for battery voltages of higher than 9.5v enable/disable table r sw resistor hv823 v dd enable 0v disable
7 supertex inc . 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com hv823 external component description external component selection guide line diode fast reverse recovery diode, 1n4148 or equivalent. cs capacitor 0.01f to 0.1f, 100v capacitor to gnd is used to store the energy transferred from the induc - tor. rel-osc the el lamp frequency is controlled via an external r el resistor connected between rel-osc and vdd pins of the device. the lamp frequency increases as r el decreases. as the el lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage v cs will decrease. the color of the el lamp is dependent upon its frequency. a 2.0m resistor would provide lamp frequency of 330 to 450hz. decreasing the r el-osc by a fac - tor of 2 will increase the lamp frequency by a factor of 2. rsw-osc the switching frequency of the converter is controlled via an external resistor, r sw between the rsw-osc and vdd pins of the device. the switching frequency increases as r sw decreases. with a given inductor, as the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage, v cs , will also decrease. csw capacitor a 1.0nf capacitor is recommended on rsw-osc to gnd when a 0.01f c s capacitor is used. this capacitor is used to shunt any switching noise that may couple into the rsw-osc pin. the c sw capacitor may also be needed when driving large el lamp due to increase in switching noise. a c sw larger than 1.0nf is not recommended. lx 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 inductor will be transferred to the high voltage capacitor c s . the energy stored in the capaci - tor is connected to the internal h-bridge and therefore to the el lamp. in general, smaller value inductors, which can 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. 560h murata inductors with 14.5 series dc resistance is typically recommended. for induc - tors with the same inductance value but with lower series dc resistance, lower r sw value is needed to prevent high current draw and inductor saturation. lamp as the el lamp size increases, more current will be drawn from the battery to maintain high voltage across the el lamp. the input power, (v in x i in ), will also increase. if the input power is greater than the power dissipation of the package (400mw), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation.
8 supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such appl ications unless it receives an adequate product liability indemnification insurance agreement. supertex inc. does not assume responsibility for use of devices described, and limits its liabilit y to the replacement of the devices determined defective due to workmanship. no responsibility is assumed for possible omissions and inaccuracies. circuitry an d specifications are subject to change without notice. for the latest product specifications refer to the supertex inc . (website: http//ww w. supertex.com ) ?2010 supertex inc. all rights reserved. unauthorized use or reproduction is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 te l: 408-222-8888 www .supertex.com (the package drawing(s) in this data sheet may not re?ect the most current speci?cations. for the latest package outline information go to http://www.supertex.com/packaging.htm l .) hv823 doc. # dsfp-hv823 b071509 8-lead soic (narrow body) package outline (lg) 4.90x3.90mm body, 1.5mm height (max), 1.2mm pitch 1 8 seating plane gauge plane l l1 l2 e e1 d e b a a2 a1 seating plane a a to p v iew side v iew vi ew b vi ew b 1 note 1 (index area d/2 x e1/2) vi ew a-a h h note 1 symbol a a1 a2 b d e e1 e h l l1 l2 1 dimension (mm) min 1.35* 0.10 1.25 0.31 4.80* 5.80* 3.80* 1.27 bsc 0.25 0.40 1.04 ref 0.25 bsc 0 o 5 o nom - - - - 4.90 6.00 3.90 - - - - max 1.75 0.25 1.65* 0.51 5.00* 6.20* 4.00* 0.50 1.27 8 o 15 o jedec registration ms-012, variation aa, issue e, sept. 2005. * this dimension is not speci?ed in the jedec drawing. drawings are not to scale. supertex doc. #: dspd-8solgtg, version i041309. note: this chamfer feature is optional. 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. 1.
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