doc.# dsfp-hv825 c072913 hv825 features ? processed with hvcmos ? technology ? 1.0 to 1.6v operating supply voltage ? dc to ac conversion ? output load of typically up to 6.0nf ? adjustable output lamp frequency ? adjustable converter frequency ? enable function applications ? pagers ? portable transceivers ? cellular phones ? remote control units ? calculators general description the supertex hv825 is a high voltage driver designed for driv - ing el lamps typically up to 6.0nf. the input supply voltage range is from 1.0v to 1.6v. the device uses a single inductor and a minimum number of passive components. the typical output voltage that can be applied to the el lamp is 56v. the hv825 can be enabled/disabled by connecting the r sw-osc resistor to vdd/gnd. the hv825 has two internal oscillators, a switching bipolar junction transistor (bjt), and a high voltage el lamp driver. the frequency for the switching bjt 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 rel-osc pin and the vdd pin. an external inductor is connected between the lx and vdd pins. a 0.01 to 0.1f, 100v capacitor is connected between the cs pin and the gnd pin. the el lamp is connected between the va pin and the vb pin. the switching bjt charges the external inductor and discharges it into the 0.01 to 0.1f, 100v capacitor at the cs pin. the voltage at the cs pin will start to increase. the outputs va and vb are confgured as an h-bridge and are switching in opposite states to achieve a peak-to-peak voltage of two times the v cs voltage across the el lamp. for additional information, see application notes an-h33 and an- h34. block diagram gnd vdd rel-osc va cs lx vb rsw-osc switch osc output osc q q q q high voltage el lamp driver ic supertex inc. supertex inc. www .supertex.com
2 doc.# dsfp-hv825 c072913 hv825 absolute maximum ratings parameter value supply voltage, v dd 0.5v to +2.5v operating temperature range -25c to +85c storage temperature range -65c to +150c msop-8 power dissipation 300mw so-8 power dissipation 400mw sym parameter min typ max units conditions electrical characteristics dc characteristics (over recommended operating conditions unless otherwise specifed - t a = 25c) 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. r ds(on) on-resistance of switching transistor - - 15 i = 50ma i in v dd supply current (including inductor current) - 30 38 ma v dd = 1.5v. see test circuit i ddq quiescent v dd supply current - - 1.0 r sw-osc = gnd v cs output voltage on v cs 52 56 62 v v dd = 1.5v. see test circuit v a-b differential output voltage across lamp 104 112 124 v v dd = 1.5v. see test circuit f el v a-b output drive frequency 400 - - hz v dd = 1.5v. see test circuit f sw switching transistor frequency - 30 - khz v dd = 1.5v. see test circuit d switching transistor duty cycle - 88 - % --- recommended operating conditions v dd supply voltage 1.0 - 1.6 v --- c l load capacitance 0 6.0 - nf --- t a operating temperature -25 - +85 o c --- enable/disable table v il low level input voltage to r sw-osc resistor 0 - 0.2 v v dd = 1.0 - 1.6v v ih high level input voltage to r sw-osc resistor v dd -0.5 - v dd v v dd = 1.0 - 1.6v pin confguration lx cs rsw -osc vdd rel-osc va vb gnd 1 2 3 4 5 6 7 8 product marking y = last digit of year sealed ww = week sealed l = lot number = ?green? packaging yww hv825 llll l = lot number yy = year sealed ww = week sealed = ?green? packaging h825 llll yyww top marking bottom marking 8-lead soic 8-lead msop 8-lead soic / 8-lead msop package may or may not include the following marks: si or package may or may not include the following marks: si or ordering information part number package packing hv833lg-g 8-lead soic 2500/reel hv833mg-g 8-lead msop 2500/reel typical thermal resistance package ja 8-lead soic 101 o c/w 8-lead msop 216 o c/w -g denotes a lead (pb)-free / rohs compliant package supertex inc. www .supertex.com
3 doc.# dsfp-hv825 c072913 hv825 test circuit v dd = v in = 1.0v - 1.6v 0.01f 100v c sw 1.0nf 560h 1 1n4148 750k 1.0m 2.2k 4.7nf on = v dd off = gnd 0.1f equivalent to 1.5in 2 lamp enable 7 8 6 5 lx gnd vb va rel-osc vdd rsw -osc cs 1 2 3 4 external component selection guide line diode fast reverse recovery, 1n4148 or equivalent. c s capacitor 0.01 to 0.1f, 100v capacitor to gnd is used to store the energy transferred from the inductor. r el-osc resistor the lamp frequency is controlled via the r el-osc . the lamp frequency increases as the r el-osc decreases. as the lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage v cs will decrease. this is because the lamp will draw more current from v cs when driven at higher frequencies. in general, as the lamp size increases, a larger r el-osc is recommended to provide higher v cs . however, the color of the lamp is dependent upon its frequency and the shade of the color will change slightly with different frequencies. r sw-osc resistor the switching frequency of the inductor is controlled via the r sw-osc . the switching frequency increases as the r sw-osc decreases. as the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage v cs will also decrease. l x inductor the inductor l x is used to boost up the low input voltage. when the internal switch is on, the inductor is being charged. when the internal switch is off, the charge in the inductor 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 lamp. in general smaller value inductors, which can handle more current, are more suit - able to drive larger size lamps. as the inductor value decreases, the switching frequency of the inductor (controlled by r sw-osc ) should be increased to avoid saturation. the test circuit uses a murata (lqh4n561 ) 560h inductor. using different inductor values or inductors from different manufacturers will affect the performance. as the inductor value decreases, smaller r sw-osc values should be used. this will prevent inductor saturation. an inductor with the same inductance value, (560h), but lower series resistance, will charge faster. the r sw-osc resistor value needs to be decreased to prevent inductor saturation and high current con - sumption. c sw capacitor a 1nf capacitor is recommended from the rsw-osc pin to gnd. this capacitor is used to shunt any switching noise that may couple into the rsw-osc pin. a c sw larger than 1.0nf is not recommended. external component description typical performance lamp size v in i dd v cs f el brightness 1.5in 2 1.5v 30ma 56v 450hz 3.65ft-lm notes: 1. murata part # lqh4n561k04 (max dc resistance = 14.5) for additional information, see application notes an-h33 and an-h34. supertex inc. www .supertex.com
4 doc.# dsfp-hv825 c072913 hv825 8-lead soic (narrow body) package outline (lg) 4.90x3.90mm body, 1.75mm height (max), 1.27mm pitch 1 8 seating plane gauge plane l l1 l2 e e1 d e b a a2 a1 seating plane a a t op vi ew side v iew vi ew b v iew 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. 7vgphvrvrvshfhgh-((gdj drawings are not to scale. supertex doc. #: 636279h note: 1. 7vfdpihihdhvrsrdo3ghhpvehorfdhghghdhdgfdhg7h3ghhfdehdproghgpdghh dhpehgghgphdopdhrdshggfdr supertex inc. www .supertex.com
5 hv825 (the package drawing(s) in this data sheet may not refect the most current specifcations. for the latest package outline information go to http://www.supertex.com/packaging.html .) doc.# dsfp-hv825 c072913 8-lead msop package outline (mg) 3.00x3.00mm body, 1.10mm height (max), 0.65mm pitch v iew b vi ew a-a seating plane gauge plane l l1 l2 vi ew b 1 1 8 e e1 d e b a a2 a1 seating plane a a t op vi ew side v iew note 1 (index area d/2 x e1/2) symbol a a1 a2 b d e e1 e l l1 l2 dimension (mm) min 0.75* 0.00 0.75 0.22 2.80* 4.65* 2.80* 0.65 bsc 0.40 0.95 ref 0.25 bsc 0 o 5 o nom - - 0.85 - 3.00 4.90 3.00 0.60 - - max 1.10 0.15 0.95 0.38 3.20* 5.15* 3.20* 0.80 8 o 15 o jedec registration mo-187, variation aa, issue e, dec. 2004. * this dimension is not specifed in the jedec drawing. drawings are not to scale. supertex doc. #: dspd-8msopmg, version i041309. note: 1. a pin 1 identifer must be located in the index area indicated. the pin 1 identifer can be: a molded mark/identifer; an embedded metal marker; or a printed indicator. 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 and specifications are subject to change without notice. for the latest product specifications refer to the supertex inc. (website: http//www .supertex.com) ?2013 supertex inc. all rights reserved. unauthorized use or reproduction is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
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