? semiconductor components industries, llc, 2004 may, 2004 ? rev. 1 1 publication order number: and8113/d and8113/d nis5101 smart hotplug demonstration board prepared by: alan ball on semiconductor general description the nis5101 demo board is a simple circuit which biases the nis5101 device so that its functionality can easily be observed. it contains both input and output capacitors, as well as resistors for the uvlo and ovlo settings. the demo board defaults are for a 33 volt uvlo turn?on point, and a 75 volt ovlo shut down point. the current limit circuit is set for 4.5 amp limit. input power and loads can easily be connected via banana jacks mounted on the board. features ? integrated power fet (no external power components required) ? simple adjustments for ovlo and uvlo ? 100 volt operation ? thermal limit protection uvlo the uvlo is set for a trip point of 33 volts, but can easily be modified for other voltages. select the desired voltage from the chart in figure 1, and install the corresponding resistor into the board. ovlo the ovlo circuit is set for a trip point of 75 volts. this setting can easily be changed by selecting the desired trip voltage from the chart in figure 2 and installing the corresponding resistor into the board. the ovlo circuit can be programmed as low as 20 volts, to allow operation for lower input voltages such as a 24 volt system. 15 25 30 35 45 10 100 figure 1. uvlo adjustment uvlo_r ext (k ) uvlo trip point (v) figure 2. ovlo adjustment ovlo_r ext (k ) ovlo trip point (v) 1000 20 40 10 20 30 40 50 60 70 80 90 100 10 100 1000 application note http://onsemi.com
and8113/d http://onsemi.com 2 current limit the current limit circuit has a 20 resistor installed which will allow the maximum current of 4.5 amps before invoking the current limit circuit. to change the current limit circuit, select the corresponding resistance value for the desired peak current setting from the chart in figure 3. 0.1 1.0 1 10 100 1000 figure 3. current limit adjustment r ext _i limit ( ) i limit (a) 10 100 overload short circuit figure 4. demo board schematic + + + 324 k r ovlo 316 k r uvlo uvlo ovlo drain current limit input + input ? 20 r limit nis5101 + 100 f 100 f 2 k r l 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 an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout 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 application s 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 indemnify and hold scillc and its officers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800?282?9855 toll free usa/canada japan : on semiconductor, japan customer focus center 2?9?1 kamimeguro, meguro?ku, tokyo, japan 153?0051 phone : 81?3?5773?3850 and8113/d smart hotplug is a trademark of semiconductor components industries, llc. literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303?675?2175 or 800?344?3860 toll free usa/canada fax : 303?675?2176 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : http://onsemi.com order literature : http://www.onsemi.com/litorder for additional information, please contact your local sales representative.
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