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hummer module 40 or 70 watts b6-3 f eatures ?5? to +125? 12 to 40 vdc input sync on hum-70 reduce hold-up capacitance by 80% powers dc/dc converters with 28 vin nominal hold-up time hum-40 15 s/f hum-70 8.6 s/f low power flag inhibit function models p ower o utput description interpoints hummer hold-up module series provides a single product solution to the problem of maintaining electronic system operation during input power drop-out, typically reducing bulk capacitance requirements by more than 80%. the hummer module is compatible with the interpoint dc/dc converters in section b1 that have a 28 vdc nominal input and a high input line of 40 vdc. the traditional procedure for providing hold-up during power loss is to buffer the device with enough bulk capacitance to allow a controlled shutdown to occur or an alternative power source to be brought on line. the problem with this approach is that very large capacitor banks are required because the capacitors are charged at the relatively low voltage at which power fails. the hummer hold-up module provides an alternative with two important advantages: 1) it effectively reduces the low line voltage for normal dc/dc converter operation to 12 vdc thereby reducing power drop-out events, and 2) it charges hold-up capacitors to 40 volts, reducing the capacitance needed to produce a given hold-up time. g eneral o peration the hummer module and two external components (a hold-up capacitor and a diode) are connected between the line source and the dc/dc converter as shown in figure 3 (hummer module system block diagram.) if an emi filter is employed, the hummer module is connected between the filter and the converter). the module first charges the external capacitor to 40 volts, and then allows the converter to operate off the line voltage. when the line voltage drops to between 12 to 18 vdc, a boost converter in the module supplies an output at the capacitor charging voltage (40 vdc). if power fails (the input voltage drops below 12 vdc), the converter is powered from the external hold-up capacitor. h old u p m odule 28 v olt i nput hum-40 40 watts hum-70 70watts size (max.): hum-40, non flanged, case f2 1.950 x 1.350 x 0.415 inches (49.53 x 34.29 x 10.54 mm) hum-40, flanged, case j2 2.720 x 1.350 x 0.415 inches (69.09 x 34.29 x 10.54 mm) hum-70 case u1 1.505 x 3.005 x 0.400 inches (38.23 x 76.33 x 10.16 mm) see section b8, cases f2, j2, and u1, for dimensions. weight: hum-40 50 grams max. (flanged 60 grams typical) hum-70 70 grams max. screening: standard or es. see section c2 for screening option and section a5 for ordering information.
sync and inhibit recommended operating conditions b6-4 h old u p m odule absolute maximum ratings input voltage range 12 to 40 vdc continuous case operating temperature (tc) ?5 to +125? full power output power hum-40 40 watts * hum-70 70 watts input voltage range 12 to 50 continuous 80 v for up to 50 ms lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +135? sync (hum-70 only) range 525 min to 625 max khz duty cycle 40% min to 60% max logic low 0.8v, max logic high 4.5 v, min referenced to input common if sync is not used, leave unconnected inhibit ttl open collector logic low (output disabled) logic low voltage 0.8 v max inhibit pin current 15 ma referenced to input common logic high (output enabled) open circuit voltage 10 v typical hum-40 hum-70 parameter condition min max min max units output voltage cext terminal 39 40 39 40 vdc output power continuous 40 70 w peak, 2 sec 60 100 input voltage continuous 12 50 12 50 vdc transient 50 ms 80 80 v input ripple current 2 mhz bandwidth 100 100 ma p-p v in = 28v, vcs open 90 90 ma input current v in = 28v, inhibited 10 10 v in = 12v, full load 4.6 8.6 a v in = 40v, full load 92 92 efficiency v in = 22v, full load 87 87 % v in = 12v, full load 80 80 hold-up time full load 15 8.6 s/f power fail high, open circuit 14.0 14.5 14.0 14.5 vdc flag threshold low, short return 11.5 12.0 11.5 12.0 capacitor voltage open 22 24 22 24 vdc controlled switch closed 18 19 18 19 cap charged high, open circuit 34 36 34 36 vdc flag threshold low, short return 19.5 20.5 19.5 20.5 notes 1. full load for specifications is 40 w for hum-40 and 70 w for hum-70. hummer series 40 or 70 watts electrical characteristics: 25? tc, 28 vdc vin, 100% load, free run, unless otherwise specified.
pin out b6-5 hummer series 40 or 70 watt pin hum-40 (40 watt) hum-70 (70 watt) 1 no connection sync 2 vcs (voltage control switch) cap charged flag 3 + cext (ext. capacitor, positive) inhibit 4 cext return (ext. capacitor, return) power fail flag 5 input common no connection 6 positive input no connection 7 case ground vcs (voltage control switch) 8 cap charged flag + cext (ext. capacitor, positive) 9 inhibit cext return (ext. capacitor, return) 10 power fail flag input common 11 n/a positive input 12 n/a no connection dot on top of cover indicates pin one. bottom view hum-40 flanged and non-flanged see section b8, cases f2, and j2, for dimensions. dotted line outlines flanged package option. 109876 12345 angled corner indicates pin one. top view hum-70 (pin side, marked side) see section b8, case u1, for dimensions. 1 2 3 4 5 6 12 11 10 9 8 7 hum - 40 f / es base model output power screening case option (non-flanged case has no designator in this position) (standard screening has no designator in this position.) f igure 1: hum-40 p in o ut f igure 2: hum-70 p in o ut hum - 70 / es base model output power screening (standard screening has no designator in this position.) h old u p m odule model numbering key
b6-6 hummer series 40 or 70 watt detailed operational description the detailed operation of the hummer module is divided into 4 operations: initialization and charging, normal operation, low line operation, and power fail operation. for details, refer to the following text, figure 4 (hummer module block diagram) and figure 5 (hummer module signal diagram). 1. i nitialization and c harging as the input voltage ramps up to 8 to 10 volts, the internal hummer module circuits are biased to provide correct output states on all flags. as the input reaches 14 vdc, the power fail flag (active low) is released, the voltage control switch (vcs) is closed, and the module begins operating in a boost mode to charge the external capacitor to 40 volts. at this point, if the recom- mended connection has been made between the capacitor charged pin and the inhibit pin of the converter as shown in figure 3, all of the module energy is dedicated to charging the capacitor and the converter will be inhibited until the capacitor charge reaches 36 v. if this connection has not been made, the energy available to charge the capacitor will be the difference between the current required by the converters load and the current capacity of the hummer module. note: the hummer module is rated at a total operating power more than its output rating in order to allow it to both deliver a full load and to continue charging the external capacitor (the hum-40, for example, is rated at 40 w output and 60 w total operating power, allowing it to deliver 40 w to a load and charge a capacitor at 10 to 20 j/sec). however, if the input voltage ramps up slowly into a full converter load, the total power drawn at low voltage could send the module into current limit which would shut the unit down. when the input voltage reaches approximately 22 vdc, the vcs is opened, isolating the stored charge on the external capacitor and allowing the converter to operate directly from the input power bus via the external system diode (unless the converter is still inhibited by the connection between the capacitor charged pin and converters inhibit pin) while the capacitor continues to charge. when the charge on the external capacitor reaches approximately 35 volts (80% of a full charge), the capacitor charged flag will be asserted (removing the inhibit from the converter if applicable) and the hummer module will be in normal operation. c ext return +c ext vcs pwm capacitor charged inhibit power fail current sense + + + +v in v in return case ground input current limit f igure 4: hummer m odule b lock d iagram emi filter (if used) +v in v in return case ground power fail inhibit c ext return capacitor charged vcs +v in inhibit v in return +v out v out return dc-dc converter load 28 vdc 28 vdc return hummer hold-up module +c ext 1. external holdup capacitor c ext 1 f igure 3: hummer m odule s ystem b lock d iagram h old u p m odule
hummer series 40 or 70 watts b6-7 2. n ormal o peration normal operation continues with the capacitor charged and the input line voltage between 18 and 40 vdc. during this time, the converter will operate from the line voltage through the external diode. when the external capacitor reaches its final charge of 40 volts, the hummer module enters an idle state, consuming only enough power to keep the capacitor charged. idle state power for the module is approximately 1 watt. note: the hummer module itself can sustain continuous voltages of up to 50 vdc and voltage spikes of 80 volts for up to 50 msec, and it will pass these voltages on to the converter through the external bypass diode. if these ratings exceed the rating of the converter, care should be taken to control the line voltage to prevent damage to the converter. normal operation will continue indefinitely until the input voltage drops below 18 vdc. 3. l ow l ine o peration low line operation occurs when the input voltage drops to a range between 18 and 12 volts. when the voltage reaches 18 vdc, the hummer modules vcs closes and then operates in a boost mode. in this mode, the hummer module supplies 40 vdc through vcs to the converter, and at the same time maintains the charge on the capacitor. the module will operate indefinitely in this low line region until the input line voltage drops below 12 vdc. 4. p ower f ail o peration when the input line voltage drops to 12 vdc, the power fail flag is asserted (pulled low) and the hummer modules boost mode is disabled. at this point, the converter load is powered by the stored energy in the external capacitor. when the voltage on the external capacitor falls to 20 vdc, the capacitor charged flag is released (pulled low), indicating that 90% of the usable stored energy has been depleted. if the connection has been made between the capacitor charged pin and the converters inhibit pin, the converter will also be inhibited. initialization & charging { { normal operation low line operation normal operation power fail operation { ? v in = 10 ? v in = 14 vcs with diode 30 20 10 0 40 30 20 10 0 40 30 20 10 0 0 v in ext cap cap charged ? v in = 23 ? v in = 12 v in = 19 v in = 19 ? v cap ? v cap v in v in vcs closed ramp down on ext cap vcs closed v cap = 20 v cap = 35 ? v cap = 40 v in = 10 ?flags active v in = 14 ?power fail flag v in = 22?cs opens v cap = 35 ?cap charged v in = 18 ?vcs closed v in = 23 ?vcs opens v in = 18 ?vcs closes v in = 12 ?power fail flag v cap = 20 ?cap charged flag v= 10 ?flags not active { { 0 power fail open ? v in = 22 f igure 5: hummer m odule s ignal d iagram h old u p m odule
b6-8 hummer series 40 or 70 watt pin connections e xternal c apacitor s election the external capacitor supplies the energy for the dc/dc converters operation during power failure. interpoint recommends clr-79 or clr-81 wet slug tantalum capacitors because of their high cv properties and extended temperature operation. an alter- native choice is a high quality grade aluminum electrolytic. to ensure maximum system stability, the capacitors should have a minimum esr of 0.25 ohms, a minimum capacitance of 330 uf, and a maximum capacitance of 1 f. the capacitance needed and derating required will depend on the system requirements, the load, and the efficiency of the converter being supplied power. the amount of capacitance for a given hold- up time is determined by the formula c= 2p ? t where : n ( v 1 2 ? v 2 2 ) c is required capacitance (in farads). p is power to the load (output of converter) to be held up (in watts) n is the efficiency of the converter at rated load (in %) ? t is required hold-up time (in seconds) v1is charged capacitor voltage (in volts) v2is low-line voltage of dc/dc converter (in volts) for a 50 msec hold-up of 30 w output from a converter with a effi- ciency of 80% and a 16 vdc low line and a 40 v capacitor charge: c = (2) ?(30) ?(0.050) ; c = 3 = 2790 f (0.80) ?(40 2 ?16 2 ) 1075.2 note: the output power delivered by the hummer module to deliver 30 w to the load with an 80% efficient converter is 37.5 watts. the hum-40 is rated to deliver a maximum of 40 watts to the input of the converter. interpoint data sheets for individual converters supply an efficiency curve vs. line and load for each converter model. in calculations, assume the efficiency rating for the nominal (usually 28 v) line condition. note: if the capacitor charged pin is connected to the converters inhibit pin as shown in figure 3, use 20 v as the low line figure in the formula. d iode s election and c onnection an external diode is required for system operation as shown in figure 3, with the diode anode connected to the hummer modules vcs pin and the dc/dc converters +v in pin. this diode supplies input voltage to the converter when the internal voltage control switch (vcs) is open. the diode should be selected with a minimum current rating of 5 a and a voltage breakdown rating of 50 v or greater (similar to motorola mdr1060 or equivalent). caution: do not connect the hummer modules input return pin to the cext return. this connection will short the modules current limit sense resistor resulting in excessive currents that can also damage the dc/dc converter. i nhibit f unction the hummer modules inhibit pin disables the internal boost converter when the inhibit pin is pulled low. this is accomplished by an external connection to the vin return pin or vout return pin. the inhibit open circuit voltage is is 10 v and the short circuit current is 15 ma. it is open-collector ttl or cmos compatible. the pin is diode-isolated and can be reverse biased to include the input poten- tial. power fail and capacitor charged flags are operable when the unit is inhibited. flag functions p ower f ail f lag the power fail flag output is implemented by a comparator moni- toring the input voltage. (the comparator is also used to inhibit hummer modules operation; note however, that the flag is func- tional when the unit is inhibited.) the input voltage threshold is nominally 14.5 v to indicate that sufficient voltage is present for operation. the comparator output drives an internal mosfet buffer which connects to the external power fail pin. the buffer is of an open drain configuration and requires an external pull-up resistor and voltage for indication. the maximum recommended pull-up voltage is 36 v. the maximum short circuit should not exceed 10ma. the buffer is protected by a shunt zener diode connected between the drain and the cext return. in normal operation, the input voltage exceeds the 14 v threshold and the output is high (open drain). when the input voltage is below 12 v the output is low, and the mosfet conducts to the return. c apacitor c harged f lag a capacitor charged flag is implemented by a comparator moni- toring the hummer modules +cext terminal. the capacitor voltage threshold is 36 v, at which point the external capacitor is charged to 80% of its maximum value. when the capacitor discharges, the flag resets at 20 vdc indicating that approximately 10% of the charge remains. the comparator output drives a mosfet buffer amplifier, and the buffer output connects to the cap charged pin. the buffer is of an open drain configuration and requires a pull-up resistor and voltage for indication. the maximum recommended pull-up voltage is 36 v. the maximum short circuit current should not exceed 10 ma. during normal operation, the input is 40 v, exceeding the threshold, and the output is high (open circuit). when the capacitor voltage is below 20 v, the output is low, and the mosfet conducts to the return. the hummer module must be supplied with a minimum of 8 vdc for biasing internal circuits to obtain correct output states. h old u p m odule 26821-001-dts rev a dq# 3002 all technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. hummer is a trademark of interpoint. copyright 1994 - 1999 interpoint. all rights reserved.
b8-12 case f c ases materials header case f1 cold rolled steel/nickel/gold cases f2 - f4 cold rolled steel/nickel/tin cover case f1 kovar/nickel cases f2 - f4 cold rolled steel/nickel/tin pins #52 alloy (all cases) mhv series triple ?compression glass seal mtr series triple, case f1 ?ceramic seal mtr series triple, case f2 ?compression glass seal hum40 ?compression glass seal or ceramic seal case f3 ?compression glass seal case f4 ?compression glass seal or ceramic seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified case f bottom view see figures 20 - 23 for pin configuration 1.350 max (34.29) 1.950 max (49.53) caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. dot on top of case indicates pin one 109876 0.000 0.170 (4.32) 1.170 (29.72) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 12345 0.040 dia. (1.02) 0.000 0.25 (6.4) mtr series mhv series 0.405 max (10.29) 0.000 0.405 max (10.29) bathtub platform mtr series triple and mhv series triple: screening ?standard, es, or 883 bottom view case f1 seam seal 0.25 (6.4) dot on top of case indicates pin one f igure 20: c ase f1 f igure 19: c ase f m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. please refer to the numerical dimensions for accuracy.
b8-13 case f c ases 0.000 0.170 (4.32) 1.170 (29.72) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 0.040 dia. (1.02) 0.000 hum-40: screening ?standard or es bottom view case f2 0.250/0.300 (6.35/7.62) solder seal 0.415 0.015 (10.54 0.38) solder tip-off 109876 12345 squared corner and dot on top of case indicate pin one. f igure 21: c ase f2 0.000 0.170 (4.32) 1.170 (29.72) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 0.040 dia. (1.02) 0.000 mrh series: screening ?standard or es bottom view case f3 0.250/0.300 (6.35/7.62) solder seal 0.455 max (11.56 ) solder tip-off 109876 12345 squared corner and dot on top of case indicate pin one. f igure 22: c ase f3
b8-22 case j c ases materials header case j1 cold rolled steel/nickel/gold cases j2 - j5 cold rolled steel/nickel/tin cover case j1 kovar/nickel case j2 - j5 cold rolled steel/nickel/tin pins #52 alloy (all cases) case j1 mhv series triple ?compression glass seal mtr series triple ?ceramic seal cases j2 - j5 compression glass seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified case j bottom view see figures 36 - 40 for pin configuration 1.350 max (34.29) caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. flange thickness: cases j1 and j5 0.060 (1.52) case j2 0.073 (1.85) max cases j3 and j4 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) 2.720 max (69.09) dot on top of case indicates pin one f igure 35: c ase j m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. please refer to the numerical dimensions for accuracy.
b8-24 case j c ases 0.040 dia. (1.02) 0.000 0.25 (6.4) 0.173 (4.39) 0.000 1.173 (29.79 0.673 (17.09) flanged case: designator required in case option position of model number. hum-40 module: screening ?standard or es bottom view case j2 109876 0.000 0.170 (4.32) 0.210 (5.33) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 1.980 (50.29) 12345 hum-40 module solder seal solder tip-off 0.415 max (10.54) squared corner and dot on top of case indicate pin one. f igure 37: c ase j2 0.040 dia. (1.02) 0.000 0.25 (6.4) 10 9 8 7 6 0.000 0.170 (4.32) 0.210 (5.33) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 1.980 (50.29) 12345 0.173 (4.39) 0.000 1.173 (29.79 0.673 (17.09) 0.162 dia (4.11) flanged case: designator required in case option position of model number. mrh series: screening ?standard or es bottom view case j3 solder seal solder tip-off 0.455 max (11.56) squared corner and dot on top of case indicate pin one. f igure 38: c ase j3
b8-36 case case u c ases materials header cold rolled steel/nickel/gold cover kovar/nickel pins #52 alloy/gold compression glass seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. case u top view (pin side) see figures 55 and 56 for dimensions 1.505 max (38.23) 3.005 (76.33) max. note: pins are shown for case u1. angled corner indicates pin one f igure 54: c ase u m aximum d imensions
b8-37 case u c ases angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 0.000 0.050 (1.27) 0.000 0.120 (3.05) 0.250 (6.35) 0.450 (11.43) 0.650 (16.51) 0.850 (21.59) 1.050 (26.67) 1.250 (31.75) 1.380 (35.05) 1.505 (38.23) max. 0.000 0.120 (3.05) 0.250 (6.35) 2.750 (69.85) 2.880 (73.15) 3.005 (76.33) max. 0.128 dia (3.25). 0.040 dia (1.02) 0.23 (5.8) lead length 0.400 (10.16) max. 0.220 (5.59 top view case u1 mfl series and mhp series: screening ?standard, es or 883 mflhp series, fmd270 emi filter, and fmd28-461sl emi filters: screening ?standard or es smfl, smflhp, smhp, and ssp series; sfcs, and sfme emi filters: screening ?standard, class h or k hum70 module and lcm module: screening ?standard or es seam seal f igure 55: c ase u1
c2-10 test (125? products) standard /es /883 (class h)* pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65? to 150? no no yes method 1010, cond. b, -55? to 125? no yes no constant acceleration method 2001, 3000 g no no yes method 2001, 500 g no yes no burn-in method 1015, 160 hours at 125? no no yes 96 hours at 125? case (typical) no yes no final electrical test mil-prf-38534, group a subgroups 1 through 6: -55?, +25?, +125? no no yes subgroups 1 and 4: +25? case yes yes no hermeticity testing fine leak, method 1014, cond. a no yes yes gross leak, method 1014, cond. c no yes yes gross leak, dip (1 x 10 -3 ) yes no no final visual inspection method 2009 yes yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of ?5? to +125?. mor series mflhp series mfl series mhp series mtr series mqo series mhd series mhv series mhf+ series mhf series mga series msa series mgh series mch series fm-704a emi filter fmd/fme emi filter fmc emi filter fmh emi filter fmga emi filter fmsa emi filter hum modules lcm modules lim modules qa screening 125? products 125? p roducts applies to the following products (some models do not offer ?83?screening, please refer to the individual series datasheets to determine what screening is available):

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