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? semiconductor components industries, llc, 2002 may, 2002 rev. 3 1 publication order number: cs5253b1/d cs5253b-1 3.0 a ldo 5-pin adjustable linear regulator with remote sense applications this new very low dropout linear regulator reduces total power dissipation in the application. to achieve very low dropout, the internal pass transistor is powered separately from the control circuitry. furthermore, with the control and power inputs tied together, this device can be used in single supply configuration and still offer a better dropout voltage than conventional pnpnpn based ldo regulators. in this mode the dropout is determined by the minimum control voltage. the cs5253b1 is offered in a fiveterminal d 2 pak package, which allows for the implementation of a remotesense pin permitting very accurate regulation of output voltage directly at the load, where it counts, rather than at the regulator. this remote sensing feature virtually eliminates output voltage variations due to load changes and resistive voltage drops. typical load regulation measured at the sense pin is less than 1.0 mv for an output voltage of 2.5 v with a load step of 10 ma to 3.0 a. the cs5253b1 has a very fast transient loop response which can be adjusted using a small capacitor on the adjust pin. internal protection circuitry provides for abustproofo operation, similar to threeterminal regulators. this circuitry, which includes overcurrent, short circuit, and overtemperature protection will self protect the regulator under all fault conditions. the cs5253b1 is ideal for generating a 2.5 v supply to power graphics controllers used on vga cards. its remote sense and low value capacitance requirements make this a low cost, high performance solution. the cs5253b1 is optimized from the cs52531 to allow a lower value of output capacitor to be used at the expense of a slower transient response. features ? v out range is 1.25 v to 5.0 v @ 3.0 a ? v power dropout < 0.40 v @ 3.0 a ? v control dropout < 1.05 v @ 3.0 a ? 1.0% trimmed reference ? fast transient response ? remote voltage sensing ? thermal shutdown ? current limit ? short circuit protection ? dropin replacement for ez1582 ? backwards compatible with 3pin regulators ? very low dropout reduces total power consumption marking diagram a = assembly location wl, l = wafer lot yy, y = year ww, w = work week tab = v out pin 1. v sense 2. adjust 3. v out 4. v control 5. v power d 2 pak 5pin dp suffix case 936f 1 5 device package shipping ordering information cs5253b1gdp5 d 2 pak* 50 units/rail cs5253b1gdpr5 d 2 pak* 750 tape & reel *5pin. cs 5253b1 awlyww 1 http://onsemi.com
cs5253b1 http://onsemi.com 2 figure 1. application diagram cs5253b1 10 m f 10 v v control v power v out v sense adjust 100 m f 5.0 v 5.0 v 3.3 v 124 124 2.5 v @ 3.0 a c load (optional) 33 m f 5.0 v gnd gnd r dis r dis maximum ratings* rating value unit v power input voltage 6.0 v v control input voltage 13 v operating junction temperature range, t j 0 to 150 c storage temperature range 65 to +150 c esd damage threshold 2.0 kv lead temperature soldering: reflow: (smd styles only) (note 1) 230 peak c 1. 60 second maximum above 183 c. *the maximum package power dissipation must be observed. electrical characteristics (0 c t a 70 c; 0 c t j 150 c; v sense = v out and v adj = 0 v; unless otherwise specified.) characteristic test conditions min typ max unit cs5253b1 reference voltage v control = 2.75 v to 12 v, v power = 2.05 v to 5.5 v, i out = 10 ma to 3.0 a 1.237 (1.0%) 1.250 1.263 (+1.0%) v line regulation v control = 2.5 v to 12 v, v power = 1.75 v to 5.5 v, i out = 10 ma 0.02 0.2 % load regulation v control = 2.75 v, v power = 2.05 v, i out = 10 ma to 3.0 a, with remote sense 0.04 0.3 % minimum load current (note 2) v control = 5.0 v, v power = 3.3 v, d v out = +1.0% 5.0 10 ma control pin current (note 3) v control = 2.75 v, v power = 2.05 v, i out = 100 ma v control = 2.75 v, v power = 2.05 v, i out = 3.0 a 6.0 35 10 120 ma ma adjust pin current v control = 2.75 v, v power = 2.05 v, i out = 10 ma 60 120 m a current limit v control = 2.75 v, v power = 2.05 v, d v out = 4.0% 3.1 4.0 a short circuit current v control = 2.75 v, v power = 2.05 v, v out = 0 v 2.0 3.5 a ripple rejection (note 4) v control = v power = 3.25 v, v ripple = 1.0 v pp @ 120 hz, i out = 3.0 a, c adj = 0.1 m f 60 80 db 2. the minimum load current is the minimum current required to maintain regulation. normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. 3. the v control pin current is the drive current required for the output transistor. this current will track output current with roughly a 1:1 00 ratio. the minimum value is equal to the quiescent current of the device. 4. this parameter is guaranteed by design and is not 100% production tested.
cs5253b1 http://onsemi.com 3 electrical characteristics (continued) (0 c t a 70 c; 0 c t j 150 c; v sense = v out and v adj = 0 v; unless otherwise specified.) characteristic unit max typ min test conditions cs5253b1 (continued) thermal regulation 30 ms pulse, t a = 25 c 0.002 %/w v control dropout voltage (minimum v control v out ) (note 5) v power = 2.05 v, i out = 100 ma v power = 2.05 v, i out = 1.0 a v power = 2.05 v, i out = 3.0 a 0.90 1.00 1.05 1.15 1.15 1.30 v v v v power dropout voltage (minimum v power v out ) (note 5) v control = 2.75 v, i out = 100 ma v control = 2.75 v, i out = 1.0 a v control = 2.75 v, i out = 3.0 a 0.05 0.15 0.40 0.15 0.25 0.60 v v v rms output noise freq = 10 hz to 10 khz, t a = 25 c 0.003 %v out temperature stability 0.5 % thermal shutdown (note 6) 150 180 210 c thermal shutdown hysteresis 25 c v control supply only output current v control = 13 v, v power not connected, v adj = v out = v sense = 0 v 50 ma v power supply only output current v power = 6.0 v, v control not connected, v adj = v out = v sense = 0 v 0.1 1.0 ma 5. dropout is defined as either the minimum control voltage (v control ) or minimum power voltage (v power ) to output voltage differential required to maintain 1.0% regulation at a particular load current. 6. this parameter is guaranteed by design, but not parametrically tested in production. however, a 100% thermal shutdown functio nal test is performed on each part. package pin description package pin # d 2 pak pin symbol function 1 v sense this kelvin sense pin allows for remote sensing of the output voltage at the load for improved regulation. it is internally connected to the positive input of the voltage sensing error amplifier. 2 adjust this pin is connected to the low side of the internally trimmed 1.0% bandgap reference voltage and carries a bias current of about 50 m a. a resistor divider from adjust to v out and from adjust to ground sets the output voltage. also, transient response can be improved by adding a small bypass capacitor from this pin to ground. 3 v out this pin is connected to the emitter of the power pass transistor and provides a regulated voltage capable of sourcing 3.0 a of current. 4 v control this is the supply voltage for the regulator control circuitry. for the device to regulate, this voltage should be between 0.9 v and 1.3 v (depending on the output current) greater than the output voltage. the control pin current will be about 1.0% of the output current. 5 v power this is the power input voltage. this pin is physically connected to the collector of the power pass transistor. for the device to regulate, this voltage should be between 0.1 v and 0.6 v greater than the output voltage depending on the out- put current. the output load current of 3.0 a is supplied through this pin.
cs5253b1 http://onsemi.com 4 figure 2. block diagram + + bias and tsd v ref ea ia v out v sense adjust v power v control typical performance characteristics figure 3. reference voltage vs junction temperature figure 4. load regulation vs output current figure 5. transient response comparison between cs52531 and cs5253b1 figure 6. output current vs v power v out junction temperature ( c) 0 20 40 60 80 120 1.247 reference voltage (v) 1.248 1.249 1.250 1.251 1.252 1.253 100 output current (a) 0 0.5 1.0 1.5 2.0 3.0 0 load regulation (%) 0.02 0.04 0.06 0.08 0.10 0.12 2.5 t j = 20 c t j = 120 c t j = 0 c 01 23 4 6 5 v power v out (v) output current (a) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 measured at d v out = 1.0% v control = 5.0 v v power = 3.3 v v out = 2.5 v c control = 10 m f c adj = 0.1 m f v out cs52531 c out = 330 m f v out cs5253b1 c out = 33 m f i load 10 ma to 3.0 a 15 a/ m s 80 a/ m s
cs5253b1 http://onsemi.com 5 figure 7. adjust pin current vs junction temperature figure 8. minimum load current vs v control v out figure 9. short circuit output current vs junction temperature figure 10. ripple rejection vs frequency figure 11. v control only output current vs junction temperature figure 12. v control dropout voltage vs output current 0 20 40 60 80 140 100 junction temperature ( c) i adj ( m a) 85 80 75 70 65 60 120 1.0 2.0 3.0 4.0 6.0 5.0 v control v out (v) minimum load current ( m a) 1200 1150 1100 1050 1000 950 900 850 800 7.0 8.0 9.0 10 11 v power = 3.3 v d v out = +1.0% 020 60 40 140 junction temperature ( c) short circuit output current limit (a) 3.9 3.8 3.7 3.6 3.5 3.4 3.3 80 120 100 v control = 5.0 v v power = 3.3 v 10 1 10 2 10 3 10 4 10 6 10 5 frequency (hz) ripple rejection (db) 90 80 70 60 50 40 30 20 10 v in v out = 2.0 v i out = 3.0 a v ripple = 1.0 v pp c out = 22 m f c adj = 0.1 m f 020 60 40 140 junction temperature ( c) i out (ma) 12 10 8 6 4 2 0 80 120 100 v control = 13 v v out = 0 v v power not connected output current (a) 0 0.5 1.0 1.5 2.0 3.0 800 v control dropout voltage (mv) 900 1000 1100 2.5 t j = 20 c t j = 120 c t j = 0 c output current (a) v power = 2.05 v
cs5253b1 http://onsemi.com 6 figure 13. v power dropout voltage vs output current figure 14. minimum load current vs v power v out figure 15. v power only output current vs junction temperature figure 16. v control supply current vs junction temperature figure 17. current limit vs v out figure 18. stability vs esr v power dropout voltage (v) 500 450 400 350 300 250 200 150 50 0 0 0.5 1.0 1.5 2.0 3.0 2.5 output current (a) t j = 120 c t j = 20 c t j = 0 c minimum load current ( m a) 916.4 916.3 916.2 916.1 916.0 915.9 915.8 915.7 915.6 915.5 915.4 0.5 1.5 2.5 4.5 3.5 v power v out (v) v control = 5.0 v d v out = +1.0% 020 60 40 140 junction temperature ( c) i out ( m a) 30 25 20 15 10 5 0 80 120 100 v power = 6.0 v v out = 0 v v control not connected 020 60 40 140 junction temperature ( c) 80 120 100 i control (ma) 40 35 30 25 20 15 10 5 0 v control = 2.75 v v power = 2.05 v i out = 3.0 a i out = 1.0 a i out = 100 ma current limit (a) 5.0 4.5 4.0 3.5 0 0.5 1.0 1.5 2.0 3.0 2.5 v out (v) v power = 3.3 v v control = 5.0 v v out set for 2.5 v t a = 25 c esr ( w ) 6 5 3 1 0 0102030 50 40 capacitance ( m f) 60 70 80 90 100 4 2 v power = 3.3 v v control = 5.0 v i load = 0 to 3.0 a unstable stable region v out = 2.5 v v out shorted to v sense t j = 0 c to 150 c
cs5253b1 http://onsemi.com 7 applications notes theory of operation the cs5253b1 linear regulator provides adjustable voltages from 1.25 v to 5.0 v at currents up to 3.0 a. the regulator is protected against short circuits, and includes a thermal shutdown circuit with hysteresis. the output, which is current limited, consists of a pnpnpn transistor pair and requires an output capacitor for stability. a detailed procedure for selecting this capacitor is included in the stability considerations section. v power function the cs5253b1 utilizes a two supply approach to maximize efficiency. the collector of the power device is brought out to the v power pin to minimize internal power dissipation under high current loads. v control provides for the control circuitry and the drive for the output npn transistor. v control should be at least 1.0 v greater than the output voltage. special care has been taken to ensure that there are no supply sequencing problems. the output voltage will not turn on until both supplies are operating. if the control voltage comes up first, the output current will be limited to about three milliamperes until the power input voltage comes up. if the power input voltage comes up first, the output will not turn on at all until the control voltage comes up. the output can never come up unregulated. the cs5253b1 can also be used as a single supply device with the control and power inputs tied together. in this mode, the dropout will be determined by the minimum control voltage. output voltage sensing the cs5253b1 five terminal linear regulator includes a dedicated v sense function. this allows for true kelvin sensing of the output voltage. this feature can virtually eliminate errors in the output voltage due to load regulation. regulation will be optimized at the point where the sense pin is tied to the output. design guidelines remote sense remote sense operation can be easily obtained with the cs5253b1 but some care must be paid to the layout and positioning of the filter capacitors around the part. the ground side of the input capacitors on the +5.0 v and +3.3 v lines and the local v out toground local output capacitor on the ic output must be tied close to the ground connected resistor voltage divider feedback network. the top resistor of the divider must be connected directly to the v sense pin of the regulator. this will establish the stability of the part. this capacitordivider resistor connection may then be connected to ground remotely at the load, giving the ground portion remote sense operation. the v sense line can then be tied remotely at the load connection, giving the feedback remote sense operation. the remote sense lines should be kelvin connected so as to eliminate the ef fect of load current voltage drop. an optional bypass capacitor may be used at the load to reduce the ef fect of load variations and spikes. figure 19. remote sense cs5253b1 v control v power v out v sense adj 100 m f +5.0 v +3.3 v +load optional gnd r dis r dis + 10 m f + 33 m f + + local connections remote connections load 124 124
cs5253b1 http://onsemi.com 8 adjustable operation this ldo adjustable regulator has an output voltage range of 1.25 v to 5.0 v. an external resistor divider sets the output voltage as shown in figure 20. the regulator's voltage sensing error amplifier maintains a fixed 1.25 v reference between the output pin and the adjust pin. figure 20. typical application schematic. the resistor divider sets v out , with the internal 1.260 v reference dropped across r1. cs5253b1 v control v power v out v sense adjust r2 r1 5.0 v 3.3 v 2.5 v @ 3.0 a a resistor divider network r1 and r2 causes a fixed current to flow to ground. this current creates a voltage across r2 that adds to the 1.25 v across r1 and sets the overall output voltage. the adjust pin current (typically 50 m a) also flows through r2 and adds a small error that should be taken into account if precise adjustment of v out is necessary. the output voltage is set according to the formula: v out 1.25 v r1 r2 r1 r2 i adj the term i adj r2 represents the error added by the adjust pin current. r1 is chosen so that the minimum load current is at least 10 ma. r1 and r2 should be of the same composition for best tracking over temperature. while not required, a bypass capacitor connected between the adjust pin and ground will improve transient response and ripple rejection. a 0.1 m f tantalum capacitor is recommended for afirst cuto design. value and type may be varied to optimize performance vs. price. other adjustable operation considerations the cs5253b1 linear regulator has an absolute maximum specification of 6.0 v for the voltage difference between v power and v out . however, the ic may be used to regulate voltages in excess of 6.0 v. the two main considerations in such a design are the sequencing of power supplies and short circuit capability. power supply sequencing should be such that the v control supply is brought up coincidentally with or before the v power supply. this allows the ic to begin charging the output capacitor as soon as the v power to v out differential is large enough that the pass transistor conducts. as v power increases, the pass transistor will remain in dropout, and current is passed to the load until v out is in regulation. further increase in the supply voltage brings the pass transistor out of dropout. in this manner, any output voltage less than 13 v may be regulated, provided the v power to v out differential is less than 6.0 v. in the case where v control and v power are shorted, there is no theoretical limit to the regulated voltage as long as the v power to v out differential of 6.0 v is not exceeded. there is a possibility of damaging the ic when v power v out is greater than 6.0 v if a short circuit occurs. short circuit conditions will result in the immediate operation of the pass transistor outside of its safe operating area. overvoltage stresses will then cause destruction of the pass transistor before overcurrent or thermal shutdown circuitry can become active. additional circuitry may be required to clamp the v power to v out differential to less than 6.0 v if fail safe operation is required. one possible clamp circuit is illustrated in figure 21; however, the design of clamp circuitry must be done on an application by application basis. care must be taken to ensure the clamp actually protects the design. components used in the clamp design must be able to withstand the short circuit condition indefinitely while protecting the ic. figure 21. this circuit is an example of how the cs5253b1 can be shortcircuit protected when operating with v out > 6.0 v v control v power v sense v out v adj external supply external supply cs5253b1 stability considerations the output compensation capacitor helps determine three main characteristics of a linear regulator: loop stability, startup delay, and load transient response. different capacitor types vary widely in tolerance, esr (equivalent series resistance), esl (equivalent series inductance), and variation over temperature. tantalum and aluminum electrolytic capacitors work best, with electrolytic capacitors being less expensive in general, but varying more in capacitor value and esr over temperature. the cs5253b1 requires an output capacitor to guarantee loop stability. the stability vs esr graph in the typical performance section shows the minimum esr needed to
cs5253b1 http://onsemi.com 9 guarantee stability, but under ideal conditions. these include: having v out connected to v sense directly at the ic pins; the compensation capacitor located right at the pins with a minimum lead length; the adjust feedback resistor divider ground, (bottom of r2 in figure 20), connected right at the capacitor ground; and with power supply decoupling capacitors located close to the ic pins. the actual performance will vary greatly with board layout for each application. in particular, the use of the remote sensing feature will require a larger capacitor with less esr. for most applications, a minimum of 33 m f tantalum or 150 m f aluminum electrolytic, with an esr less than 1.0 w over temperature, is recommended. larger capacitors and lower esr will improve stability. the load transient response, during the time it takes the regulator to respond, is also determined by the output capacitor. for large changes in load current, the esr of the output capacitor causes an immediate drop in output voltage given by: v i esr there is then an additional drop in output voltage given by: v i t c where t is the time for the regulation loop to begin to respond. the very fast transient response time of the cs5253b1 allows the esr effect to dominate. for microprocessor applications, it is customary to use an output capacitor network consisting of several tantalum and ceramic capacitors in parallel. this reduces the overall esr and reduces the instantaneous output voltage drop under transient load conditions. the output capacitor network should be as close to the load as possible for the best transient response. protection diodes when large external capacitors are used with a linear regulator, it is sometimes necessary to add protection diodes. if the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. the discharge current depends on the value of the capacitor, the output voltage, and the rate at which v control drops. in the cs5253b1 regulator, the discharge path is through a large junction and protection diodes are not usually needed. if the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. in this case, a diode connected as shown in figure 22 is recommended. figure 22. diode protection circuit cs5253b1 v control v power v out v sense adjust a rule of thumb useful in determining if a protection diode is required is to solve for current: i c v t where: i is the current flow out of the load capacitance when v control is shorted, c is the value of load capacitance v is the output voltage, and t is the time duration required for v control to transition from high to being shorted. if the calculated current is greater than or equal to the typical short circuit current value provided in the specifications, serious thought should be given to the use of a protection diode. current limit the internal current limit circuit limits the output current under excessive load conditions. short circuit protection the device includes short circuit protection circuitry that clamps the output current at approximately 500 ma less than its current limit value. this provides for a current foldback function, which reduces power dissipation under a direct shorted load. thermal shutdown the thermal shutdown circuitry is guaranteed by design to activate above a die junction temperature of approximately 150 c and to shut down the regulator output. this circuitry has 25 c of typical hysteresis, thereby allowing the regulator to recover from a thermal fault automatically.
cs5253b1 http://onsemi.com 10 calculating power dissipation and heat sink requirements high power regulators such as the cs5253b1 usually operate at high junction temperatures. therefore, it is important to calculate the power dissipation and junction temperatures accurately to ensure that an adequate heat sink is used. since the package tab is connected to v out on the cs5253b1, electrical isolation may be required for some applications. also, as with all high power packages, thermal compound in necessary to ensure proper heat flow. for added safety, this high current ldo includes an internal thermal shutdown circuit the thermal characteristics of an ic depend on the following four factors: junction temperature, ambient temperature, die power dissipation, and the thermal resistance from the die junction to ambient air. the maximum junction temperature can be determined by: t j(max) t a(max) pd (max) r ja the maximum ambient temperature and the power dissipation are determined by the design while the maximum junction temperature and the thermal resistance depend on the manufacturer and the package type. the maximum power dissipation for a regulator is: pd (max) ( v in(max) v out(min) ) i out(max) v in(max) i in(max) a heat sink effectively increases the surface area of the package to improve the flow of heat away from the ic and into the surrounding air. each material in the heat flow path between the ic and the outside environment has a thermal resistance which is measured in degrees per watt. like series electrical resistances, these thermal resistances are summed to determine the total thermal resistance between the die junction and the surrounding air, r q ja . this total thermal resistance is comprised of three components. these resistive terms are measured from junction to case (r q jc ), case to heat sink (r q cs ), and heat sink to ambient air (r q sa ). the equation is: r ja r jc r cs r sa the value for r qjc is 2.5 c/watt for the cs5253b1 in the d 2 pak package. for a high current regulator such as the cs5253b1 the majority of heat is generated in the power transistor section. the value for r q sa depends on the heat sink type, while the r q cs depends on factors such as package type, heat sink interface (is an insulator and thermal grease used?), and the contact area between the heat sink and the package. once these calculations are complete, the maximum permissible value of r q ja can be calculated and the proper heat sink selected. for further discussion on heat sink selection, see our application note athermal management,o document number and8036/d, available through the literature distribution center or via our website at http://www.onsemi.com.
cs5253b1 http://onsemi.com 11 package dimensions d 2 pak 5pin dp suffix case 936f01 issue o t dim min max min max millimeters inches a 0.326 0.336 8.28 8.53 b 0.396 0.406 10.05 10.31 c 0.170 0.180 4.31 4.57 d 0.026 0.035 0.66 0.91 e 0.045 0.055 1.14 1.40 f 0.090 0.110 2.29 2.79 g 0.067 bsc 1.70 bsc h 0.098 0.108 2.49 2.74 j 0.018 0.025 0.46 0.64 k 0.204 0.214 5.18 5.44 m 0.055 0.066 1.40 1.68 n 0.000 0.004 0.00 0.10 notes: 1. dimensions and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. tab contour optional within dimensions b and m. 4. dimensions a and b do not include mold flash or gate protrusions. mold flash and gate protrusions not to exceed 0.025 (0.635) max. b n a k m e c seating plane f h j d 5 pl g t m 0.13 (0.005) m b 12345 package thermal data parameter d 2 pak, 5pin unit r q jc typical 2.5 c/w r q ja typical 1050* c/w *depending on thermal properties of substrate. r q ja = r q jc + r q ca .
cs5253b1 http://onsemi.com 12 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indem nify and hold scillc and its of ficers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and re asonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized u se, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employ er. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. cs5253b1/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada

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