sensitron semiconductor product brief 5038, rev b ? phone (631) 586 7600 ? www.sensitron.com ? e-mail: sales@ sensitron.com ? page 1 spdn series cobra cobra series programmable multi-channel solid state power controllers the cobra series of programmable multi-channel solid state power controllers (sspc) are multi-channel, microcontroller based, solid state power controller boards designed to for 28vdc applications. each channel of the cobra series is software programmable for rated current up to 25a and can operate grouped with other channels to support large loads up to 150a of current. the cobra is intended to be used where multiple solid state power controller channels need to be co-located on the same card or in a power distribu tion box. these boards have integrated current sensing, temperature and voltage sensing with no derating over the full operating temperature range and communicate with the system controller over an rs-232, rs-422, and rs-485 or can serial bus. f f e e a a t t u u r r e e s s : : ? up to 6 channels can be grouped together ? programmable from 1 amp to 25 amps ? parallel channel capability up to 150 amps ? trip disable and maintenance modes ? power-up and continuous built-in test ? non-volatile storage of parameters ? true i 2 t and thermal memory protection ? internally generated isolated supply ? high control circuit isolation ? soft turn-on to reduce emc issues ? trip-free reset circuit ? optically isolated input and outputs ? -55 o c to 100 o c operating temp range ? no heat sinking required b b e e n n e e f f i i t t s s : : sensitron?s sspc technology and pro ducts combine functiona lities of electro-mech anical breakers, solid state relays and system monitors and provi de the following benefits to our customers: ? electrical load protection and monitoring - current, voltage and temperature measurements ? operational improvements by allowing for diagnostics, prognostics and condition-based maintenance ? life cycle cost savings and reduced cost of ownership ? increased radius of operation through power budgeting and load shedding ? crew offloading and network-controlled intelligent load management a a p p p p l l i i c c a a t t i i o o n n a a r r e e a a s s : : sensitron?s sspc products are ideal for use in power management applic ations in the following markets: ? military ground vehicles ? unmanned aerial vehicles ? marine vessels ? test & industrial equipment ? communication and command centers ? energy exploration equipment ? off highway and heavy duty vehicles ? medical emergency vehicles
sensitron semiconductor product brief 5038, rev b ? 2009 sensitron semiconductor ? phone (631) 586 7600 ? www.sensitron.com ? sales@sensitron.com ? page 2 spdn series cobra figure 1 ? block diagram i/o definitions control & status (ttl/cmos compatible) bias (vcc) 5.0v dc nominal, 7.0v dc absolute maximum 4.5v to 5.5 vdc bias (vcc) current 105 ma typ 150 ma, max (rs-422/rs-485 serial i/o) bit* output v oh =3.7v, min, at i oh =-20ma v ol =0.4v, max, at i ol =20ma maintenance mode and battleshort inputs v t+ (positive-going input threshold voltage) v t ? (negative-going input threshold voltage) v t hysteresis (v t + v t ? ) 2.0v, min, 3.5v, max 1.2v, min, 2.3v, max 0.6v, min, 1.4v, max power input voltage ? continuous ? transient 0 to 40v dc, 50v dc absolute maximum +600v or ?600v spike (< 10 us) power dissipation ? single channel 1 < 0.68w typ @ 15a @ 25 c < 2.25w max @ 25a @ 25 c power dissipation ? six channels 1 (each channel at indicated current) < 4.5w typ @ 15a @ 25 c < 15.0w max @ 25a @ 25 c output rise time (turn-on) 760 sec typ, 500 sec, min. output fall time under normal turn-off 160 sec typ, 100 sec, min. output fall time under fault 75 sec typ min load requirement nil table 1- electrical characteristics
sensitron semiconductor product brief 5038, rev b ? 2009 sensitron semiconductor ? phone (631) 586 7600 ? www.sensitron.com ? sales@sensitron.com ? page 3 spdn series cobra figure 2 ? trip times the cobra series board measures current for each indivi dual channel and calculates i2t and instant trip. if the trip condition is met, the channel turns of 28vdc ra ils from the load. this condition is stored on the board and can be queried by the power management comp uter (pmc) via the communications interface. figure 3 ? outline drawing
sensitron semiconductor product brief 5038, rev b ? 2009 sensitron semiconductor ? phone (631) 586 7600 ? www.sensitron.com ? sales@sensitron.com ? page 4 spdn series cobra support sensitron?s graphical user interface pr ovides a quick way to interact with the diamondback board. this pc- based program is designed for lab use and enables the user to ev aluate the board. the gui sends the commands to the board to perform tasks such as channel turn on/off, measurement readi ngs, channel paralleling, etc. please contact the factory to obt ain a copy of this program. compliant documents & standards mil-std-1275d characteristics of 28 volt dc electrical systems in military vehicles mil-std-704f aircraft electrical power characteristics mil-std-217f, notice 2 reliability prediction of electronic equipment part numbering ordering information : disclaimer: 1- the information given herein, including the specifications and dimens ions, is subject to change without prior notice to impr ove product characteristics. before ordering, purchas ers are advised to contact the sensitron semiconductor sales department for the latest version of the datasheet(s). 2- in cases where extremely high reliabilit y is required (such as use in nuclear power control, aerospace and aviation, traffic equipment, medical equipment , and safety equipment) , safety s hould be ensured by using semi conductor devices that featur e assured safety or by m eans of users? fail-safe precautions or other arrangement . 3- in no event shall sensitron semiconductor be liable for any dam ages that may result from an accident or any other cause duri ng operation of the user?s units according to the datas heet(s). sensitron semiconductor assumes no responsibility for any intellectual property claims or any other problems that may result from applications of info rmation, products or circuits described in the datasheets. 4- in no event shall sensitron semiconductor be liable for any fa ilure in a semiconductor device or any secondary damage result ing from use at a value exceeding the absolute maximum rating. 5- no license is granted by the datasheet(s ) under any patents or other rights of any third party or sensitron semiconductor. 6- the datasheet(s) may not be reproduced or duplicated, in any form, in whole or par t, without the expressed written permissio n of sensitron semiconductor. 7- the products (technologies) de scribed in the datasheet(s) are not to be provi ded to any party whose purpose in their applica tion will hinder maintenance of international peace and safety nor are they to be ap plied to that purpose by their direct purchasers or any thir d party. when exporting these products (technolog ies), the necessary procedures are to be taken in accordance with related laws and regulatio ns.
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