rev. dec 15, 2003 w ww.power-one.com page 1 of 7 hb c d c - dc series data shee t 30 0 - watt hal f - brick converte r s applications ? intermediate bus architectures ? telecommunications equipment ? lan/wan applications ? data processing applications features ? high efficiency up to 94% ? high power density ? 110 w/in 3 ? high current rating - 25a ? low profile ? 12.7mm height ? input/output isolation: 1500vdc ? basic insulation ? start-up into high capacitive load ? low conducted and radiated emi ? output overcurrent protection ? output overvoltage protection ? overtemperature protection ? remote sense ? remote on/off (primary referenced), positive or negative logic option ? adjustable output voltage from 9.6v to 13.2v ? ul 1950 recognition, csa 22.2 no. 950-95 certification, tuv iec950 description the hbc series of high density bus converters convert a worldwide telecom bus voltage of 36 to 75vdc to a 12v bus at 25a. the output is ideal for powering non-isolated, point-of-load converters such as synchronous buck converters used commonly in intermediate bus architectures. the unit's open-frame, two-board construction provides ideal thermal transfer for maximum reliability. power devices are mounted on an insulated metal substrate (ims) base plate with very low thermal impedance. the control pcb is physically isolated from the hotter ims board, providing lower overall component temperatures for high reliability. the standard feature set includes remote on/off, remote output voltage sensing, positive output trim, input undervoltage lockout, and overtemperature shutdown with hysteresis. model selection model input voltage vdc input current, max adc output voltage vout, vdc output rated current i rated, adc output ripple/noise, mv p-p typical efficiency @ i rated, % HBC25ZH 36-75 10 12.0 25 150 92
rev. dec 15, 2003 w ww.power-one.com page 2 of 7 hb c d c - d c s eries data s hee t 300-watt half-brick converters absolute maximum ratings stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long- term reliability, and cause permanent damage to the converter. parameter conditions/description min max units input voltage continuous transient, 100ms 75 100 vdc vdc operating temperature base plate temperature -40 110 c storage temperature -55 125 c on/off control voltage referenced to -vin 7 vdc environmental and mechanical specifications all specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. parameter conditions/description min nom max units shock halfsine wave, 3 axes 50 g sinusoidal vibration gr-63-core, section 5.4.2 1 g weight 2.6/73 gm water washing standard process yes mtbf per bellcore tr-nwt-000332 1,100 khrs isolation specifications all specifications apply over specified input voltage, output load and temperature range, unless otherwise noted. parameter conditions/description min nom max units insulation safety rating basic isolation voltage input to output, output to base plate 1500 vdc isolation voltage input to base plate 1500 vdc isolation resistance 10 mohm isolation capacitance 1000 pf input specifications all specifications apply over specified input voltage, output load and temperature range, unless otherwise noted. parameter conditions/description min nom max units input voltage continuous 36 48 75 vdc turn-on input voltage ramping up 33 36 vdc turn-off input voltage ramping down 31 33 vdc turn-on time for turn-on via application of input voltage time from vin=uvlo to regulation band 60 85 ms turn-on time for turn-on via on/off signal time from on/off signal to regulation band 10 25 ms input reflected ripple current full load, 12 h source inductance 200 ma p-p inrush transient vin=vin.max 0.25 a 2 s
rev. dec 15, 2003 w ww.power-one.com page 3 of 7 hb c d c - d c s eries data s hee t 300-watt half-brick converters output specifications all specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. parameter conditions/description min nom max units output voltage setpoint accuracy vin=vin.nom, full load -2 2 %vout output current* see selection chart for i rated 0 25 a line regulation vin.min to vin.max, i rated 0.5 %vout load regulation vin=vin.nom, 10% to 100%i rated 1.0 %vout total output voltage regulation over all input voltage, load, and temperature conditions -4 4 %vout remote sense headroom 5% %vout dynamic regulation peak deviation settling time 75-100% load step change to 1% error band 600 600 1,000 mv s admissible load capacitance i rated , nom vin 15,000 f output current limit threshold** vout 0.97vout.nom 110 150 %i rated switching frequency 400 khz overvoltage protection, latching over all input voltage and load conditions 115 125 %vout trim range i rated , vin=vnom 80 110 %vout ** overcurrent protection is non-latching with auto recovery. feature specifications all specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. parameter conditions/description min nom max units shutdown (on/off) negative logic converter on source current converter off open circuit voltage positive logic converter on open circuit voltage converter off source current on/off signal is low ? converter is on on/off pin is connected to -vin on/off pin is floating on/off signal is low?converter is off on/off pin is floating on/off pin is connected to -vin -0.5 2.5 2.5 -0.5 0.8 0.5 7 5 7 5 0.8 0.5 vdc madc vdc vdc vdc vdc vdc madc overtemperature protection base plate temperature 120 130 c
rev. dec 15, 2003 w ww.power-one.com page 4 of 7 hb c d c - d c s eries data s hee t 300-watt half-brick converters efficiency curves 75 80 85 90 95 0 20406080100 load % efficiency % 36v 48v 75v figure 1. HBC25ZH efficiency vs. output load typical application figure 2 shows the recommended connections for the hbc series converter. +vo +sense trim -sense -vo -vi +vi on/off fuse c1 c2 c3 HBC25ZH figure 2. typical application of hbc series the hbc series converters do not require any external components for proper operation. however, if the distribution of the input voltage to the converter contains significant inductance, the capacitor c1 may be required to enhance performance of the converter. a minimum of a 68 f electrolytic capacitor with the esr<0.7 ? is recommended for the hbc series. refer to the ?inrush current control application note? on www.power-one.com for suggestions on how to limit the magnitude of the inrush current. for output decoupling we recommend using a 10 f low esr tantalum capacitor (avx tpsc106m025r0500 is used in our test setup) and a 1 f ceramic capacitor. note, that the capacitors do not substitute the filtering required by the load. shutdown feature description the on/off pin in the hbc series converters functions as a normal soft shutdown. it is referenced to the ?vin pin (see figure 2). with the positive logic, when the on/off pin is pulled low, the output is turned off and the unit goes into a very low input power mode. with negative logic, when the on/off pin is pulled low, the unit is turned on. an open collector switch is recommended to control the voltage between the on/off pin and the -vin pin of the converter. the on/off pin is pulled up internally, so no external voltage source is required. the user should avoid connecting a resistor between the on/off pin and the +vin pin. when the on/off pin is used to achieve remote control, the user must take care to ensure that the pin reference for the control is really the -vin pin. the control signal must not be referenced ahead of emi filtering, or remotely from the unit. optically coupling the information and locating the optical coupler directly at the module will solve any of these problems. note: if the on/off pin is not used, it can be left floating (positive logic), or connected to the -vin pin (negative logic). output voltage trim industry standard positive trim (suffix ?t) the -t option units trim up with a resistor from the trim (#7) pin to the +sense (#8) pin and trim down with a resistor from the trim (#7) pin to the ?sense (#6) pin as shown in figure 3.
rev. dec 15, 2003 w ww.power-one.com page 5 of 7 hb c d c - d c s eries data s hee t 300-watt half-brick converters figure 3. hbc series positive trim schematic the equations below determine the trim resistor value required to achieve a ? v change in the output voltage. ? ? ? ? ? ? ? ? ? + ? ? ? + = k vo rup % %) 2 100 ( % 225 . 1 %) 100 ( ? ? ? ? ? ? ? ? ? = k rdown ) 2 % 100 where ? v% is the output voltage change expressed in percents of the nominal output voltage, vo. notes: 1. when the output voltage is trimmed up, the output power from the converter must not exceed its maximum rating. the power is determined by measuring the output voltage on the output pins, and multiplying it by the output current. 2. in order to avoid creating apparent load regulation degradation, it is important that the trim resistors are connected directly to the remote sense pins, and not to the load or to traces going to the load. 3. the output voltage increase can be accomplished by either the trim or by the remote sense or by the combination of both. in any case the absolute maximum output voltage increase shall not exceed 10% of the nominal output voltage safety considerations the hbc series converters feature 1500 volt dc isolation from input to output. the input to output resistance is greater than 10m ? . these converters are provided with basic insulation between input and output circuits according to all iec60950 based standards. nevertheless, if the system using the converter needs to receive safety agency approval, certain rules must be followed in the design of the system. in particular, all of the creepage and clearance requirements of the end-use safety requirements must be observed. these documents include ul60950 - csa60950-00 and en60950, although other or additional requirements may be needed for specific applications. the hbc series converters have no internal fuse. the external fuse must be provided to protect the system from catastrophic. the user can select a fuse based upon the highest inrush transient at the maximum input voltage and the maximum input current of the converter, which occurs at the minimum input voltage. both input traces and the chassis ground trace (if applicable) must be capable of conducting a current of 1.5 times the value of the fuse without opening. the fuse must not be placed in the grounded input line, if any. in order for the output of the hbc series converter to be considered as selv (safety extra low voltage) or tnv-1, according to all iec60950 based standards, one of the following requirements must be met in the system design: ? if the voltage source feeding the module is selv or tnv-2, the output of the converter may be grounded or ungrounded. ? if the voltage source feeding the module is elv, the output of the converter may be considered selv only if the output is grounded per the requirements of the standard. ? if the voltage source feeding the module is a hazardous voltage secondary circuit, the voltage source feeding the module must be provided with at least basic insulation between the source to the converter and any hazardous voltages. the entire system, including the hbc converter, must pass a dielectric withstand test for reinforced insulation. design of this type of systems requires expert engineering and under- standing of the overall safety requirements and should be performed by qualified personnel.
rev. dec 15, 2003 w ww.power-one.com page 6 of 7 hb c d c - d c s eries data s hee t 300-watt half-brick converters thermal considerations the hbc series converters are designed for natural or forced convection cooling. the maximum allowable output current of the converters is determined by meeting the derating criteria for all components used in the converters. for example, the maximum semiconductor junction temperature is not allowed to exceed 125c to ensure reliable long-term operation of the converters. contact power-one for the complete list of the derating criteria. the graph in figure 4 shows the maximum output current of the hbc series converter at different ambient temperatures under both natural and forced (longitudinal airflow direction, from pin 1 to pin 4) convection. thermal derating curve vin = 54v, orientation : vin- to vin + 0 5 10 15 20 25 30 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm HBC25ZH-t, -nt data rev: 01 figure 4. HBC25ZH-t, nt derating curves for example, from figure 4, the HBC25ZH operating at 45oc can deliver up to 19a reliably with 200lfm forced air, while up to 23a reliably with 400lfm forced air.
rev. dec 15, 2003 w ww.power-one.com page 7 of 7 hb c d c - d c s eries data s hee t 300-watt half-brick converters mechanical drawing mechanical tolerances inches millimeters x.xx 0.020 x.x 0.5 x.xxx 0.010 x. xx 0.25 pin 0.002 0.05 ordering information options suffixes to add to part number positive- standard, no suffix required remote on/off negative- add ?n? suffix trim positive - ?t? suffix (required - all models) 0.18?- standard, no suffix required 0.145?- add ?7? suffix pin length 0.110?- add ?8? suffix example: HBC25ZH-t8 is a positive on/off logic, industry standard trim, 12v output converter with 0.110? pin length notes 1. consult factory for the complete list of available options. nuclear and medical applications - power-one products are not authorized for use as critical components in life support systems , equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divi sional president of power-one, inc. technical revisions - the appearance of products, including safety agency certifications pictured on labels, may change dependi ng on the date manufactured. specifications are subject to change without notice. pin function 1 -vin 2 case 3 on/off 4 +vin 5 -vout 6 -sense 7 trim 8 +sense 9 +vout
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