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www.irf.com 1 high reliability dc-dc converter htm27092s description 190 to 400v dc input range up to 92w output power 92v, 1.0a rated output voltage and current internal emi filter magnetically coupled feedback 80% minimum efficiency -20c to +165c continuous with transient up to +175c 100m ? @ 500v dc isolation under-voltage lockout short circuit and overload protection output over voltage limiter adjustable output voltage within 10% of nominal external inhibit low weight < 80 grams features 165c, 270v input, 92w, 92v single output applications down hole exploration tools the htm27092s is a single output 92w dc-dc converter designed to operate in extremely high temperature environments such as those encountered in oil exploration. features include small size, low weight and high tolerance to environmental stresses such as wide wide temperature extremes, severe shock and vibration. all internal components and assembly processes have been selected and developed to ensure reliable performance in the intended operating environments. 10/15/13 the htm27092s converter utilizes an enhanced forward topology with two power switches and resonant reset. the nominal switching frequency is 520 khz. electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. voltage feed-forward with duty factor limiting provides high line rejection and protection against output over voltage due to certain component failures in the internal control loop. this mechanism limits the maximum output voltage to approximately 20% over the nominal regardless of the line voltage with an output load that is 25% of the full rated output power. an external inhibit port an external inhibit port (pin 4) is provided to control converter operation.the converter?s operation is inhibited when this pin is pulled low. it is designed to be driven by an open collector logic device. the pin may be left open for normal operation and has a nominal open circuit voltage of 4v with respect to the input return (pin 2). the output voltage of all models can be adjusted using a single external resistor within 10% of nominal output voltage. circuit description htm the converter incorporates a fixed frequency forward topology with magnetic feedback and internal emi filter. it also includes an external inhibit port and have an adjustable output voltage. it is enclosed in a hermetic 4.5" x 2.15" x 0.40" (4.0"x1.5"x0.40"h excluding mounting tabs and i/o pins) alsi package and weighs less than 80 grams. the package utilizes rugged ceramic feed-thru, copper-cored pins and is sealed using laser welding. . full environmental screening includes temperature cycling, constant acceleration, fine and gross leak, and burn-in. please refer to device screening table. variations in electrical specifications and screening to meet custom requirements can be accommodated output current is limited under load fault conditions to approximately 125% of the rating. an overload condition causes the converter output to behave like a constant current source with the output voltage dropping below nominal. the converter will resume normal operation when the load current is reduced below the current limit point. this protects the converter from both overload and short circuit conditions. the current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. pd-97816
2 www.irf.com htm27092s preliminary electrical performance characteristics for notes to electrical performance characteristics, refer to page 4 conditions -20c t c +165c group a v in = 270v dc 5%, c l = 0 parameter subgroup unless otherwise specified min. nom. max. unit input voltage 190 270 400 v output voltage ( v out ) 1,2,3 i out = 100% rated load, note 1 90 94 v output power ( p out ) 1,2,3 v in = 190, 270, 400 volts, note 2 0 92 w output current ( i out ) 1,2,3 v in = 190, 270, 400 volts, note 2 0 1.05 a v in = 190, 270, 400 volts, notes 1, 4 i out = 10, 50, 100% rated load v in = 190, 270, 400 volts, notes 1, 4 i out = 10, 50, 100% rated load input current, no load ( i in ) 1,2,3 i out = 0. pin 4 open 20 ma input ripple current 1,2,3 i out = 100% rated load, bw = 10mhz 230 ma p-p input current inhibited 1,2,3 pin 4 shorted to pin 2 5.0 ma input under voltage lockout 1 , 3 160 180 2 160 190 v turn-off (input voltage decreasing) 1,2,3 135 160 v in = 190, 270, 400 volts, notes 1, 3 i out = 10%, 100% rated load efficiency ( e ff ) 1,2,3 i out = 100% rated load , note 1 80 85 % switching frequency ( f s ) 1,2,3 sync. input (pin 6) open 470 580 khz synchronization input frequency range 1,2,3 500 600 khz pulse amplitude, high 1,2,3 notes 1, 12 4.0 10 v pulse amplitude, low 1,2,3 -0.5 0.8 v pulse rise time 1,2,3 100 ns pulse duty cycle 1,2,3 20 80 % mvp-p output ripple ( v rip ) 1,2,3 600 mv -920 920 mv turn-on (input voltage rising) min load, note 1 limits line regulation ( vr line ) 1,2,3 load regulation ( vr load ) 1,2,3 -900 900 input voltage range -0.5vdc to +400vdc input voltage range 190vdc to 400vdc output power internally limited output power 0 to max. rated lead temperature +300c for 10 seconds operating temperature -20c to +165c operating case temperature -20c to +175c storage temperature -20c to +165c storage temperature -55c to +175c recommended operating conditions absolute maximum ratings
www.irf.com 3 htm27092s preliminary electrical performance characteristics (continued) for notes to electrical performance characteristics, refer to page 4 conditions -20c t c +165c group a v in = 270v dc 5%, c l = 0 parameter subgroup unless otherwiese specified min. nom. max. unit enable input ( inhibit function ) open circuit voltage 1,2,3 notes 1, 12 3.0 5.0 v drive current ( sink ) -0.5 100 a voltage range 50 v current limit point expressed as a percentage 1,2,3 v out = 90% of nominal 105 150 % of full rated output power power dissipation, load fault ( p d ) 1,2,3 short circuit, overload, note 7 35 w load transient response amplitude 4,5,6 load step, 50% to/from 100% -5000 +5000 mv recovery notes 1, 8 1200 s amplitude 4,5,6 load step, 10% to/from 50% -5000 +5000 mv recovery notes 1, 8 1200 s line transient response input voltage step, 190v to/from 400v amplitude 4,5,6 i out = 100% rated load -3000 +3000 mv recovery notes 1, 9, 10 1500 s turn-on response v in = 190, 270, 400 volts overshoot ( v os ) 4,5,6 i out = 50% rated load 2000 mv turn-on delay ( t dly ) notes 1, 11 5.0 60 ms i out = 100% rated load capacitive load ( c l ) 1 no effect on dc performance 1000 f notes 1, 5, 6, 12 mil-std-461, cs101 30hz to 50khz, notes 1, 12 input to output or any pin to case except pin 10, test @ 500vdc device weight 80 g ? limits db 50 line rejection 1 40 isolation 1 100
4 www.irf.com htm27092s preliminary fig 1. circuit for measuring output ripple voltage + vout return dut r l for i rated 0.1 f 50 ? coax 50 ? oscilliscope or equivalent with 10 mhz bandwidth. multiply readings by 2. 1 f 50 ? termination notes for electrical performance characteristics table 1. unless otherwise specified, ?rated? load is 92 watts, 1.0 amps. 2. parameter verified during line and load regulation tests. 3. guaranteed for a d.c. to 20 mhz bandwidth. tested using a 20 khz to 10 mhz bandwidth. 4. load is varied for output under test. regulation relative to output voltage at 50% rated load. 5. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. 6. a capacitive load in excess of the maximum limit may interfere with the proper operation of the converter?s overload protection, causing erratic behavior during turn-on. 7. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 8. load step transition time 10 s. 9. recovery time is measured from initiation of the transient to where v out has returned to within 1% of steady state value. 10. line step transition time 100 s. 11. turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin to the point where v out = 90% of nominal. 12. parameter is tested as part of design characterization or after design changes. thereafter, parameter shall be guaranteed to the limits specified.
www.irf.com 5 htm27092s preliminary typical efficiency curves fig 2: efficiency vs output current at 25c with vin = 190v, 270v and 400v fig 3: efficiency vs output current at 165c with vin = 190v, 270v and 400v e f f i ci en cy vs ou tput cu r r ent at 25c 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 output current, a e f f ici en cy 190v vin 270v vin 400v vin e f f i ci en cy vs ou t pu t cu r r en t at 165c 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 output current, a e f f iciency 190v vin 270v vin 400v vin
6 www.irf.com htm27092s preliminary fig 4: efficiency vs temperature, load = 1.0a with vin = 190v, 270v and 400v
www.irf.com 7 htm27092s preliminary load transient waveforms. fig 5: load transient at 25c, vin = 270v, load = 0.1a to 0.5a, ch2 = vout fig 6: load transient at 165c, vin = 270v, load = 0.1a to 0.5a, ch2 = vout
8 www.irf.com htm27092s preliminary fig 7: load transient at 25c, vin = 270v, load = 0.5a to 1.0a, ch2 = vout fig 8: load transient at 165c, vin = 270v, load = 0.5a to 1.0a, ch2 = vout
www.irf.com 9 htm27092s preliminary connection of the + sense and - sense leads at a remotely located load permits compensation for resistive voltage drop between the converter output and the load when they are physically separated by a significant distance. this connection allows regulation at the point of application. to minimize noise pickup that could interfere normal operation of the converter, a twisted pair for remote sensing is highly recommended. when the remote sensing features is not used, the sense leads should be connected to their respective output terminals at the converter. technical notes remote sensing as an alternative to application and removal of the dc voltage to the input, the user can control the converter output by providing ttl compatible negative logic (low active) signal to inhibit pin (pin 4) with respect to the input return pin (pin 2). the inhibit pin is internally pulled ?high? so that when not used, an open connection on the inhibit pin permits normal converter operation. when its use is desired, a logical ?low? on this port will shut the converter down. inhibiting converter output synchronization of multiple converters when operating multiple converters, system requirements often may require operation of the converters at a common frequency. to accommodate this requirement, the converters provide both a synchronization input and output. the sync input port permits synchronization of a ht connverter to any compatible external frequency source operating between 500 khz and 600 khz. this input signal should be referenced to the input return and has a 10% to 90% duty cycle. compatibility requires transition times less than 100ns, maximum low level of +0.8v and a minimum high level of +2.0v. the sync output of a converter which has been designated as the master oscillator provides a convenient frequency source for this mode of operation. when external synchronization is not required, the sync in pin should be left unconnected thereby permitting the converter to operate at its own internally set frequency. the sync output signal is a continuous pulse train factory-set at 520 50 khz, with a duty cycle of 15 5.0%. this signal is referenced to the input return and has been tailored to be compatible with the sync input port. transition times are less than 100ns and the low level output impedance is less than 50 ? . this signal is active when the dc input voltage is within the specified operating range and the converter is not inhibited. this output has adequate drive capability to synchronize at least five additional converters. notes: (1) if the +sense connection is unintentionally broken, the converter has a fail-safe output voltage of vout + 25mv, where the 25mv is independent of the nominal output voltage. (2) in the event of both the +sense and -sense connections being broken, the output will be limited to vout + 440mv. this 440mv is also essentially constant independent of the nominal output voltage. while operation in this condition is not damaging to the device, not all performance parameters will be met. (3) the +sense pin shall be kept from being shorted to the -sense pin or the output return pin through a resistance path <5k ? , or permanent damages will occur inside the converter.
10 www.irf.com htm27092s preliminary output voltage adjust - for higher or lower output voltage in addition to permitting close voltage regulation of remotely located loads, the converter has a vadj pin allowing the users to trim its output voltage up or down for their applications. the adjustment range is limited to +10% , -20% maximum. the adjustments are intended as a means to ?trim? the output to a voltage setting for certain design application, but are not intended to create a variable output converter. an adjustable output converter. the output voltage is done by connecting a resistor with an appropriate value between the vadj pin and either +sense and or -sense pins while as shown in fig. 9 below. the resistance value for a desired output voltage can be determined by formulae described below. fig 9: connection for v out adjustment voltage trimming procedure: (1) nominal output voltage with vadj pin (pin 11) open: 92v (2) trimming up output voltage by installing a trimming resistor radj (1/4w, 1%) between the vadj pin (pin 11) and -sense pin (pin 9): radj = [ 8950 / [10 * (vout - 2.5) - 895 ] ] - 50; radj in k ? , vout in volts example: to trim vout up to 94v radj = [ 8950 / [10 * (24 - 2.5) - 895 ] ] - 50 = [ 8950 / 20 ] - 50 = 397.5 (k ? ) thus, vout can be trimmed up to 94v by installing a 1/4w, 1%, 397.5 5k ? resistor between the vadj pin (pin 11) and the -sense pin (pin 9). (3) trimming down output voltage by installing a trimming resistor radj (1/4w, 1%) between the vadj pin (pin 11) and +sense pin (pin 10) radj = [ 3580 * (vout - 2.5) ] / [ 895 - 10 * (vout - 2.5 ) ]; radj in k ? , vout in volts example: to trim vout down to 20v radj = [ 3580 * (90 - 2.5) ] / [ 895 - 10 * (90 - 2.5 ) ] = 313250 / 20 = 15662.5 (k ? ) thus, vout can be trimmed down to 90v by installing a 1/4w, 1% 15662.5 k ? (15.6625 m ?) resistor between the vadj pin (pin 11) and the +sense pin (pin 10).
www.irf.com 11 htm27092s preliminary dc-dc converters are constructed with aluminium-silicon (alsi) controlled expansion alloy benefit from low mass, high thermal conductivity, and cte match to substrates mounted in them. the one disadvantage over traditional cold rolled steel packages (crs) however is that the alsi material is more brittle than the crs. for this reason, it is important to avoid using a thermal pad or gasket. the dc-dc converter requires 6-32 size screws and #6 flat washers. the minimum recommended mounting surface flatness is 0.002? per inch. the procedure for mounting the converter is as follows: 1. check all surfaces for foreign material,burrs, or anything that may interfere with the different parts. 2. place the converter on the mounting surface and line up with mounting holes. 3. install screws using appropriate washers and tighten by hand (~ 4 in.oz) in the sequence shown below in the diagram 4. tighten the screws with appropriate torque driver using a controlled torque of up to 20-24 in.lb in the sequence as shown in the diagram below. share function - paralleling converters for higher output current or reliability redundancy the converter has a built-in or-ing diode, rated 300v/10a and connected to the share pin as indicated in fig 10. multiple converters can be paralleled and configured as shown in fig 10 for the following purposes: (1) paralleling for higher output current: several converters can be paralleled for sharing higher output current demand at the expense of some degradation in the load regulation. (2) n+1 redundancy for fault tolerance and extra system reliability: when one of the paralleled converters fails with a lower output voltage or short, it will be isolated from the rest of the converters in parallel. the system can continue to function normally. note : direct connection of the +sense pin to a remote load is not recommended due to potential control loop contention that could interfere the overall sharing stability or loss of fault isolation. consult factory for additional application speci fic options. fig 10: connection for share pin mounting procedure 1 2 3 4
12 www.irf.com htm27092s preliminary fig 11 . block diagram pin designation table input filter bias supply 1 output filter output filter current sense 12 7 6 2 4 8 11 control 5 vfb drive dc input inhibit input return sync input sync output +output output return share output trim 3 case 9 -sense 10 +sense error amp. & ref. pin # description pin # description 1 dc input 7 + output 2 input return 8 output return 3 case 9 - sense 4 inhibit 10 + sense 5 sync. output 11 trim 6 sync. input 12 share output
www.irf.com 13 htm27092s preliminary mechanical diagram 0.24 0.400 max. 4.48 ref. ? 0.144 ? 0.300 0.50 38 pin ?0.040 0.25 2.50 4.00 3.00 1.50 1.80 2.15 0.200 typ. non-cum. 1.000 ref. 0.25 0.22 0.750 mounting surface 1 6 5 4 3 2 12 7 8 9 10 11 tolerance: .xx 0.01 .xxx 0.005 flange detail
14 www.irf.com htm27092s preliminary device screening part numbering world headquarters: 101 n, sepulveda blvd., el segundo, california 90245, usa tel: (310) 252-7105 ir san jose: 2520 junction avenue, san jose, california 95134, usa tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 10/2013 requirement mil-std-883 condition no suffix /em suffix method (production (for engineering qualilty) evaluation) internal visual 2017 - x x seal (laser weld) 1014 - x x fine leak test (unpressurized) - - x x (for info only) gross leak test (unpressurized) - - x x temperature cycling 1010 -35c, +165c, 10 cycles x not required in accordance with device specification constant acceleration 2001 3000g for 1 minute x not required burn-in 1015 48 hrs @ 165c x 8 hours @ 165c in accordance with device specification fine leak test 1014 a2 x not required gross leak test 1014 c1 x x external visual 2009 - x x final electrical (group a) - x x electrical - x not required ht m 270 92 s / em model nominal input voltage 270 = 270v output voltage 92 = 92v output configuration s = single output em = engineering model blank = no suffix (production quality) (please refer to device screening table for specific screening requirements) ht = 165c power m = 92w

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