q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 1 of 9 applications ? distributed power architectures ? telecommunications equipment ? lan/wan applications ? data processing applications features ? low profile ( < 8mm ) ? 2000 vdc input-to-output isolation meets basic insulation ? high efficiency - to 88% at full load ? start-up into high capacitive load ? low conducted and radiated emi ? output overcurrent protection ? output overvoltage protection ? overtemperature protection ? back drive protection ? remote sense ? set point accuracy 1% ? remote on/off (primary referenced), positive or negative logic ? output voltage trim adjust, positive, or negative ? ul 1950 recognized, csa 22.2 no. 950- 95 certified, tuv iec9 description the new q2s15 series of low profile, high-densi ty, single-output dc/dc converters convert standard telecom and datacom voltages into isolated low- voltage outputs. the q2s?s leading-edge technology provides high efficiency. the smt mounting option elim inates the need for a separate (additional manual) process in attaching the converters to the motherboards during mass production. base model selection chart model input voltage range, vdc input current, max, adc output voltage, vdc output rated current, i rated adc output ripple / noise, typ, mv p-p efficiency @ i rated, typical , % q2s15zg 36-75 1.5 5.0 15 30 88 q2s15yg 18-36 4.7 5.0 15 30 88 location of the thermocouple for thermal testing.
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 2 of 9 absolute maximum ratings stresses in excess of the absolute maximum rating s may cause performance deg radation, adversely effect long-term reliability, and cause permanent damage to the converter. parameter conditions/description min max units input voltage continuous per gr-513, tp = 10 s 75 100 vdc vdc operating temperature at 100% load -40 100 c storage temperature -40 125 c on/off control voltage referenced to -vin 20 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.a.2 1 weight 1.02(28) oz/g water washing standard process yes mtbf per bellcore tr-nwt-000332 consult factory khrs isolation specifications all specifications apply over specified input volt age, output load, and temperat ure range, unless otherwise noted. parameter conditions/description min nom max units insulation safety rating basic isolation voltage 2000 vdc isolation resistance 10 m ? isolation capacitance 230 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 18 48 24 75 36 vdc turn-on input voltage ramping up vin= 36-75 vin = 18 -36 33 16 35 17.5 vdc turn-off input voltage ramping down vin = 36-75 vin = 18-36 31 15 33 16.5 vdc turn-on time to output regulation band 100% resistive load 2.5 ms input reflected ripple current 25 mhz bandwidth 6 ma pk.pk inrush transient vin=vin max 0.1 a 2 s
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 3 of 9 output specifications all specifications apply over specified input volt age, output load, and temperat ure range, unless otherwise noted. parameter conditions/description min nom max units output voltage setpoint accura cy vin=vin nom, full load -1 1 %vout output current* 0 15 adc line regulation vin min to vin max, iout max 2 5 mv load regulation vin=vnom, iout min to iout max 2 5 mv total output voltage regulation over all input voltage, load, and temperature conditions 4.925 5.000 5.075 vdc remote sense headroom*** 10% %vout dynamic regulation peak deviation settling time 50-75% load step change to 1% error band 120 100 mv s admissible load capacitance iout.max, nom vin 10,000 f output current limit threshold** vout 0.97vout nom 16.5 18 20 adc switching frequency 435 khz over voltage protection, non latching over all input voltage and load conditions 115 122 127 %vout trim range**** iout max, vin=vnom -20 +10 %vout ** overcurrent protection is non-latching with auto recovery. *** vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources should not exceed 10% of vout (nom) in order to insure specified operation of over-volt age protection circuitry. feature specifications all specifications apply over specified input volt age, output load, and temperat ure range, unless otherwise noted. parameter conditions/description min nom max units shutdown (on/off) negative logic - converter on - converter off positive logic - converter on - converter off on/off signal is low ? converter is on on/off pin is connected to -vin on/off signal is low ?converter is off on/off pin is connected to -vin -20 2.4 2.4 -20 0.8 20 20 0.8 vdc vdc vdc vdc overtemperature protection pcb temperature 118 c
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 4 of 9 characteristic curve load current [adc] 0246810121416 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 54 v 36 v fig. 1. q2s15zg (5.0v) efficiency vs. load typical application figure 2 shows the recommended connections for the q2s15 series converter. fig. 2. typical application of q2s15 series the q2s15 series converters do not require any external components for proper operation. however, if the distribut ion of the input voltage to the converter contains si gnificant inductance, a capacitor may be required to enhance performance of the converter. a minimum of a 100 f electrolytic capacitor with the esr<0.7 ? is recommended for the q2s15 series. if magnitude of the inrush current needs to be limited, see the ?inr ush current control application note? on the power-one website at www.power-one.com. for output decoupling we recommend using a 10 f tantalum and a 1 f ceramic capacitor connected directly across the output pins of the converter. note, that the capacitors do not substitute the filtering required by the load. shutdown feature description the on/off pin in the q2s15 series converters functions as a normal soft shutdown. it is referenced to the ?vin pin (see figure 2). with 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 insure 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 t he 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 the trim feature allows the user to adjust the output voltage from the nominal value. this can be used to compensate distribution drops, perform margining in production, or accommodate other requirements when output voltage needs to be adjusted from the nominal. the converter?s output voltage (at the terminals) can be adjusted up 10% or down 20% relative to the nominal output voltage by connecting the trim pin to sense (+) or sense (-) via a trim resistor. the trim pin should be left open if the trimming function is not to be used. to trim up the output voltage, a trim resistor, rt- incr, should be connected between trim (pin 6)
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 5 of 9 and sense(+) (pin 7), as illustrated in fig. 3. the trim-up resistor can be calculated from: fig. 3. 5.1(100+ )v o-nom ? 624.75 r t-incr = __________________________________ - 10.2 [k ] 1.225 where, r t-incr = required value of trim-up resistor v o-nom = nominal value of output voltage insert absolute value bars v o-req - v o-nom = _________________________ x 100 [%] v o-nom v o-req = desired (trimmed) output voltage when trimming up, care must be taken not to exceed the converter?s maximum allowable output power, as discussed in the previous section remote sense. to trim down the output voltage, a trim resistor, r t-decr , should be connected between trim (pin 6) and sense(-) (pin 5), as illustrated in fig.4. fig. 4. the trip-down resistor can be calculated from: 510 r t-decr = ____________ - 10.2 [k ] where, r t-decr = . required value of trim-down resistor and is as defined above.
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 6 of 9 start-up information (using negative on/off) scenario #1: initial start-up from bulk supply on/off function enabled, converter started via application of v in . see figure 5. time comments t 0 on/off pin is on; system front end power is toggled on, v in to converter begins to rise. t 1 v in crosses under-voltage lockout protection circuit threshold; converter enabled. t 2 converter begins to respond to turn-on command (converter turn-on delay). t 3 converter v out reaches 100% of nominal value. for this example, the total converter start-up time (t 3 - t 1 ) is typically 2.5 ms. scenario #2: initial start-up using on/off pin with v in previously powered, converter started via on/off pin. see figure 6. time comments t 0 v input at nominal value. t 1 arbitrary time when on/off pin is enabled (converter enabled). t 2 end of converter turn-on delay. t 3 converter v out reaches 100% of nominal value. for this example, the total converter start-up time (t 3 - t 1 ) is typically 2.5 ms. scenario #3: turn-off and restart using on/off pin with v in previously powered, converter is disabled and then enabled via on/off pin. see figure 7. time comments t 0 v in and v out are at nominal values; on/off pin on. t 1 on/off pin arbitrarily disabled; converter output falls to zero; turn-on inhibit delay period (100 ms typical) is initiated, and on/off pin action is internally inhibited. t 2 on/off pin is externally re-enabled. if (t 2 - t 1 ) 100 ms , external action of on/off pin is locked out by start-up inhibit timer. if (t 2 - t 1 ) > 100 ms , on/off pin action is internally enabled. t 3 turn-on inhibit delay period ends. if on/off pin is on, converter begins turn-on; if off, converter awaits on/off pin on signal; see figure 8. t 4 end of converter turn-on delay. t 5 converter v out reaches 100% of nominal value. for the condition, (t 2 - t 1 ) 100 ms , the total converter start-up time (t 5 - t 2 ) is typically 102.5 ms. for (t 2 - t 1 ) > 100 ms , start-up will be typically 2.5 ms after release of on/off pin. v in on/off state v out t t 0 t 1 t 2 t 3 on off fig.5. start-up scenario #1. on/off state v out t 0 t 1 t 2 t 3 on off v in t fig. 6. start-up scenario #2. on/off state off on v out t 0 t 2 t 1 t 5 v in t t 4 t 3 100 ms fig. 7. start-up scenario #3.
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 7 of 9 safety considerations the q2s15 series converters feature 2000 volt dc isolation from input to output. the input to output dc 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 syst em 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 additional requirements may be needed for user?s specific applications. the q2s15 series converters have no internal fuse. an external fuse must be provided to protect the system from catastrophic failure. the fuse with a rating not greater than 10a is recommended. the user can select a lower rating fuse based upon the highest inrush transient at the maximum input voltage and the maximum input current of the c onverter 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 q2s15 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 q2s15 converter, must pass a dielectric withstand test for reinforced insulation. design of this type of system requires expert engineering and under- standing of the overall safety requirements, and should be performed by qualified personnel. thermal considerations the q2s15 series converters are designed for natural or forced convection cooling. the maximum allowable output power of the converters is determined by meeting the derating criteria of all electronic components used in the power supplies. an example of the derating criteria for the semiconductor junction temperature is not to exceed 120 c to provide reliable long-term operation of the converters. note: please contact power-one for more derating criteria for other components. the graph in figure 8 shows the maximum output current of the q2s15 series converters at different ambient temperatures under both natural and forced (longitudinal airflow direction, from pin 3 to pin 4) convection. as an example, from figure 10, the q2s15ze operating at 50 c can deliver up to 15a reliably with 300lfm forced air. ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 0 lfm (0 m/s) fig. 8. q2s15zg (5.0v) derating curves
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 8 of 9 mechanical drawing inches (mm) through hole surface mount ? pins 1-3 and 5-7 are 0.040" (1.02) with 0.078" (1.98) shoulder ? pins 4 and 8 are 0.062" (1.57) without shoulder ? pin material: brass ? pin finish: tin/lead over nickel ? module weight: 0.95 oz (27 g) pin connections pin function 1vin (+) 2 remote on/off 3 vin (-) 4 vout (-) 5 sense (-) 6trim 7 sense (+) 8 vout (+)
q2s15 series ? 15a quarter-brick dc/dc converter 48v, 24v input data sheet 5.0v output rev. jun 12, 2002 page 9 of 9 ordering information product series output current input voltage output voltage 1 on/off logic surface mount pin length height option q2s 15 z g - n m6 c2 single output quarter-brick format g = 5.0vdc n ? negative (blank) ? positive m6 ? surface mount (blank) ? through hole blank ? 0.188? 7 ? 0.145? 8 ? 0.110? not valid w/m6 option see chart below not valid w/m6 option adc z = 48vin nom. y= 24vin nom. height, clearance and pin opti ons for through-hole versions ht (maximum height) cl (minimum clearance) pl pin length height option +0.000 [+0.00] -0.038 [- 0.97] +0.030 [+0.77] -0.000 [- 0.00] pin option 0.005 [0.13] blank 0.303 [7.69] 0.030 [ 0.77] 0.188 [4.77] c2 0.336 [8.53] 0.063 [1.600] 7 0.145 [3.68] c3 0.400 [10.16] 0.127 [3.23] 8 0.110 [2.79] c4 0.500 [12.70] 0.227 [5.77] exam ple: q2s15zg-nm6 indicates a 5. 0v output model with negative on /off logic in a smt mounting package. notes 1. consult factory for the complete list of available options. 2. power-one products are not authorized for use as crit ical components in life support systems, equipment used in hazardous environments, or nuclear control systems without t he express written consent of the respective divisional president of power-one, inc. 3. the appearance of products, including safety agency certif ications pictured on labels, may change depending on the date manufactured. specifications ar e subject to change without notice.
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