®

HUMMER MODULE

40 OR 70 WATTS

1

• –55°C to +125°C

• 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 µs/µF

HUM-70 8.6 µs/µF

• Low power flag

• Inhibit function

MODELS

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.

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.

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.