hummer module 40 or 70 watts 1 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 ?/? hum-70 8.6 ?/? low power flag inhibit function models p ower o utput description interpoint s 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. w eight: 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 2 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 p arameter 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/? 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 3 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 5i nput 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 |