broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u.s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 08 40 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 broadband telcom power, inc. btcpower btcpower tm redefining ?current? limits in power conversion prelim. specification hbo21a - 48 - 12, hbo21a - 48 - 12n 48vin 12vout 21a description the hbo21a - 48 - 12 of low cost half brick dc/dc converters are comparable to existing half - bricks. they are targeted specifically at the telecommunication, industrial electronics, mobile telecommunicatio n and distributed power markets. with a wide input voltage range of 36 - 75v they are available with output voltage of either 1.8, 2.5, 3.3, 5.0, 12, 15, 24 or 28 volts. all models feature an input filter, input undervoltage lockout, output overvoltage and o vertemperature protection, output current limiting and short circuit protection. the unique open - frame construction with aluminum heat spreader design achieves efficient heat transfer with no hot spots. applications ? telecommunications ? data communicati ons ? wireless communications ? networking gear ? servers, switches and data storage ? semiconductor test equipment ? distributed power architecture features ? delivers up to 21a in half brick ? no minimum load required ? low profile of only 0.36 inch ? 1.8v, 2.5v, 3.3v, 5.0v, 12v, 15v, 24v or 28v output models ? wide input operating range 36 - 75v ? - 40c to +100c ambient operation ? on/off pin and remote sense ? output adjustment +10% and ? 10% range ? 1500v, 10m input - to - output isolation ? meets basic insulation requirements of en60950 ? ul 1950 recognized, tuv en60950 and csa c22.2 no. 60950 - 00 certified (pending) ? meets conducted limits of fcc class b and cei iec61204 - 3 class b with external filte r ? mtbf of 1,000,000 hours @ 50c (bellcore)
prelim. specification hbo21a - 48 - 12 48vin 12vout 21a btcpower btcpower t m broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u .s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 0840 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 converter selection typical @ t a =+25c under nominal line voltage and 75% load conditions, unless noted. model input output efficiency part number voltage (volts) current (a) voltage current 75% load pos itive logic negative logi c nominal range no load full load (volts) (amps) (%) hbo21a - 48 - 12 hbo21a - 48 - 12n 48 36 - 75 0.1 5.9 12 21 88 for encapsulated (epoxy enclosed) models, replace ?hbo? in part no. with ?hbp?. consult factory for other output voltage configurations. outline and pin - out information pin connection pin# function 1 vin + 2 on/off 3 case 4 vin - 5 vout - 6 sense - 7 trim 8 sense + 9 vout + all dimensions are in inches [mm] pin 5 and 9 are dia. 0.08 [2.03] all other pins are all dia. 0.040 [1.02] pin material: brass pin finish: tin/lead plated heat spreader (baseplate) material: aluminum weight: 60.5g tolerance inches millimeters xx 0.020 x 0.5 xxx 0.010 xx 0.25 pin: 0.0 02 0.05 the information and specifications contained in this specification are believed to be accurate and reliable at the time of publication. specifications are subject to change without notice.
prelim. specification hbo21a - 48 - 12 48vin 12vout 21a btcpower btcpower t m broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u .s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 0840 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 electrical specificati on typical test data at ta=25 c, vin=48v unless otherwise noted. parameter notes min typ max unit absolute maximum rating input voltage 0 80 v operating case temperature - 40 100 c storage temperature - 40 105 c humidit y 95 % input characteristics operating input voltage range 36 75 v turn on voltage threshold 35 35.4 35.8 v turn off voltage threshold 34 34.4 34.8 v off converter input current 36vin 6 ma output charact eristics output voltage hbo21a - 48 - 12 or hbo21a - 48 - 12n 36 - 75vin, no load to full load 11.7 12.0 12.3 v line regulation 36 - 75vin, 0.2 0.3 % load regulation 36 - 75vin, 10~100% load 0.2 0.3 % output current hbo21 a - 48 - 12 or hbo21 a - 48 - 15 n 0 21 a output voltage trim range percentage of normal output - 10 +10 % output voltage ripple and noise 20mz bandwidth, 100% load, 48vin 70 100 mv(pk - pk) output over power protection 110 120 140 % over - voltage protection 115 130 % over - temperature protection 105 110 c temperature coefficient 0.05 %/ c output dynamic characteristics startup time 5% to 95% of the output voltage 10 20 ms transient recovery time 25% load change (1.0a/us) 300 500 m s transient peak 25% load change (1.0a/us) 300 400 mv efficiency hbo21a - 48 - 12 or hbo21a - 48 - 12n 88 % isolation characteristics isolation voltage(primary to secondary) 1minute 1500 vdc isolation voltage (primary to case) 1minute 1000 vdc isolation voltage (secondary to case) 1minute 1000 vdc isolation resistance 500vdc, primary to secondary 10 m w isolation voltage (secondary to case) 1minute 1000 vdc feature characteristics switching frequency 280 300 320 khz on/off control (positive logic) converter on converter off hbo21a - 48 - 12 2.5 - 1.0 7 0.5 v v on/off control (negative logic) converter on converter off hbo21a - 48 - 12n - 1.0 2.5 0.5 7 v v calculated mtbf bellcore @ 50 c 3,000,000 hrs weight 51 g
prelim. specification hbo21a - 48 - 12 48vin 12vout 21a btcpower btcpower t m broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u .s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 0840 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 basic operation and functions the hbo / hbp family uses planar transformer technology to achieve high output current. the whole unit switches at the fixed frequency for a predictable emi performance. the hbo / hbp brick has many standard controls and protection functions. input power ( pin1, pin4 ) input power vin(+) must be connected to positive input voltage pin1; input power vin( - ) must be connected to negative input voltage pin4. output power ( pin9, pin5 ) output power vout(+) must be connected to positive output voltage pin9; output power vout( - ) must be connected to negative output voltage pin5. on/off ( pin 2 ) permits the user to maintain unit on/off, in order to properly sequence different power supplies and reduce power consumption during the standby condition. there are two remote control options available, positive logic and negative logic is referenced to vin( - ), and typical connections are shown in fig 1. fig. 1: typical circuit for on/off function pin 2 is the "enable" pin, connecting a ttl compatible pin. a ttl control signal to this pin, according to the specification, will turn the unit on or off. the positive logic version turns on when pin 2 is at logic high, and turns off when pin 2 is at logic low. the unit is on when pin 2 is left open. the negat ive logic version turns on when pin 2 is at logic low and turns off when pin 2 is at logic high. the pin 2 can be directed to vin( - ), to enable automatic turn on to the unit without the need of an external control signal. remote sense ( pin 8, pin 6 ) p ermits the user to maintain the accurate output voltage at the remote load terminals regardless of the line drop. the sense( - ) (pin6) and sense(+) (pin8) should be connected at the load or at the point where the regulation is needed. ( shown on fig. 2) fig 2: remote sense circuit the remote sense feature of the unit compensates for voltage drop occurring between the output pins of the unit and load. the sense( - ) (pin5) and sense(+)(pin7) should be connected at the load or at the poi nt where regulation is required.
prelim. specification hbo21a - 48 - 12 48vin 12vout 21a btcpower btcpower t m broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u .s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 0840 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 if remote sense is not required, the sense( - ) pin must be connected to the vout( - ) pin (pin5), and the sense(+) pin must be connected to the vout(+) pin(pin 9) to ensure the unit will regulate at the specified output vo ltage. if these connections are not made, the unit?s output voltage will be higher than the specified value. the unit output over voltage protection senses the voltage across vout(+) and vout( - ), and not across the sense lines, so the resistance between t he output pins of the unit and the load should be minimized to prevent unwanted triggering of the ovp. when using the remote sense feature, the output voltage at the unit can be increased by as much as 10% above the normal rating, in order to maintain the required voltage across the load. therefore, the designer must consider this condition. also when using the remote sense function, the output power must be taken care of, as not to exceed the maximum power capability of the unit. output voltage trim (p in 7) permits the user to adjust the output voltage up or down to achieve the custom voltage or to make the output voltage margining. the adjustment range is from + 10% to - 10%. output voltage can be adjusted up or down, by connecting the rtrim - up o r rtrim - down resistor as shown. rtrim - up makes the output voltage go up to 10%; and the rtrim - down makes the output voltage go down to 10%. leave trim pin ( pin 7) open for normal output voltage. when trimming up, care must be taken, not to exceed the u nit ovp threshold. a typical circuit is shown in fig. 3. fig 3. trim up output voltage circuit trimming down the output voltage for a typical circuit, as shown on fig. 4. fig 4. trim down output voltage circu it
prelim. specification hbo21a - 48 - 12 48vin 12vout 21a btcpower btcpower t m broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u .s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 0840 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 protection features input under - voltage lockout ( iuv ) input under voltage ( iuv ) is standard with the hbo / hbp unit. the unit will shut down when the input voltage drops below a threshold, and the unit will turn on when the input voltage goes to the upper threshold. the hysteretic voltage of the under voltage protection is 1v, normally from the 34.5v to 35.4v range. output over - current protection ( ocp ) the unit will shut down when the over current or short circuit condition exists. once the ocp happens, the unit has shut down. the attempted restart will continue indefinitely until the over current or short circuit condition is removed. when ocp happens, the output voltage drops below 0.8v. input voltage has almost no e ffect on the current limit point. output over - voltage protection ( ovp ) the unit will shut down when the output voltage exceeds the over voltage threshold. if the output voltage across vout(+) (pin9) and vout( - ) (pin5) exceeds the threshold of the ovp c ircuitry, the unit has shut down which is caused by an ovp circuit, and the unit will never restart, and the output voltage is below 0.5v. over temperature protection ( otp ) the unit will shut down when the base plate temperature exceeds the p rotection threshold. the unit will shut down under the base plate temperature over a 105 c condition to protect the unit from overheating. the otp circuit will turn the unit off when otp happens. once the unit has shut down, it will restart at the cycle w hen the base plate temperature goes down.
prelim. specification hbo21a - 48 - 12 48vin 12vout 21a btcpower btcpower t m broadband telcom power, inc. 1719 s. grand avenue, santa ana, ca 92705 u .s.a. tel.: 714 - 259 - 4888 ? fax: 714 - 259 - 0840 ? www.btcpower.com ? email: sales@btcpower.com ? ps hbo21a - 48 - 12 re2 16 - 1 - 04 application information input source impedance the unit has been designed to be stable with no external capacitors when used in a low inductance input and output circuit. however in many applications, the inductance with the distribution from the power source to the input of the unit can affect the stability of the unit. the addition of 100uf electrolytic capacitor with an esr < 1 w (at 100khz) across the input can ensure the stab ility of the unit. also in many applications, the user has to use decoupling capacitors at the output load, to ensure the hold up time for the load. safety requirements and considerations the unit meets the american and international safety regulatory re quirement ul1950. basic insulation is also provided between the input side and the output side. to meet safety agencies requirements, an input line fuse must be used external to the unit. an 15a fuse or less with a normal blow rate must be used to meet th e safety agencies requirements. a minimum 42lfm airflow should also be provided if the unit is intended to operate at full power without heatsink. if the input source is non - selv ( elv or a hazardous voltage greater than 60 vdc and less than or equa l to 75 vdc), for the unit output to be considered meeting the requirements of safety extra low voltage (selv), all of the following must be met: the input source is to be provided with reinforced insulation from any hazardous volt age, including the ac main. the input pins of the unit are not operator accessible. for whole system, for safety agencies requirements, and for the combination of the unit?s input side (primary side) and the unit?s output side (secondary side), verify th at under a single fault, hazardous voltages do not appear at the unit?s output side (secondary side). never ground either of the input pins of the unit without grounding one of the output pins. this may allow a non - selv voltage to appear between the outpu t pin and ground.
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