HUMMER MODULE

40 OR 70 WATTS

EATURES

· 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

OWER

UTPUT

DESCRIPTION

Interpoint's HUMMERTM 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.

ENERAL

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.

OLD

ODULE

28 V

OLT

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

OLD

ODULE

ABSOLUTE MAXIMUM RATINGS

Input Voltage Range

· 12 to 40 VDC continuous

Case Operating Temperature (Tc)

· 55 to +125°C 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°C

Storage Temperature Range (Case)

· 65°C to +135°C

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

VDC

OUTPUT POWER

CONTINUOUS

PEAK, 2 SEC

100

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 50 ms

INPUT RIPPLE CURRENT

2 MHz Bandwidth

100

mA p-p

= 28V, VCS OPEN

INPUT CURRENT

= 28V, INHIBITED

= 12V, FULL LOAD

4.6

8.6

= 40V, FULL LOAD

EFFICIENCY

= 22V, FULL LOAD

= 12V, FULL LOAD

HOLD-UP TIME

FULL LOAD

8.6

µs/µF

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

VDC

CONTROLLED SWITCH

CLOSED

CAP CHARGED

HIGH, OPEN CIRCUIT

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°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.

PIN OUT

HUMMER SERIES

40 OR 70 WATT

Pin

HUM-40 (40 Watt)

HUM-70 (70 Watt)

No connection

Sync

VCS (Voltage Control Switch)

Cap Charged Flag

+ CEXT (Ext. Capacitor, Positive)

Inhibit

CEXT Return (Ext. Capacitor, Return)

Power Fail Flag

Input Common

No connection

Positive Input

No connection

Case Ground

VCS (Voltage Control Switch)

Cap Charged Flag

+ CEXT (Ext. Capacitor, Positive)

Inhibit

CEXT Return (Ext. Capacitor, Return)

Power Fail Flag

Input Common

N/A

Positive Input

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.

Angled corner indicates pin one.

TOP VIEW

HUM-70

(Pin side, marked side)

See Section B8, case U1, for dimensions.

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.)

IGURE

1: HUM-40 P

IGURE

2: HUM-70 P

HUM - 70 / ES

Base Model

Output Power

Screening

(Standard screening has no designator
in this position.)

OLD

ODULE

MODEL NUMBERING KEY

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

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 converter's 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 converter's 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.

EXT

RETURN

EXT

VCS

PWM

CAPACITOR
CHARGED

INHIBIT

POWER
FAIL

CURRENT

SENSE

RETURN

CASE
GROUND

INPUT

CURRENT

LIMIT

IGURE

4: HUMMER M

ODULE

LOCK

IAGRAM

EMI

FILTER

(IF USED)

RETURN

CASE
GROUND

POWER

FAIL

INHIBIT

EXT

RETURN

CAPACITOR

CHARGED

VCS

INHIBIT

RETURN

OUT

RETURN

DC-DC

CONVERTER

LOAD

28 VDC

RETURN

HUMMER
HOLD-UP

MODULE

EXT

1. EXTERNAL HOLDUP

CAPACITOR

EXT

IGURE

3: HUMMER M

ODULE

YSTEM

LOCK

IAGRAM

OLD

ODULE

HUMMER SERIES

40 OR 70 WATTS

2. N

ORMAL

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

INE

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 module's 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

AIL

PERATION

When the input line voltage drops to 12 VDC, the Power Fail flag
is asserted (pulled low) and the HUMMER module's 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 converter's Inhibit pin, the
converter will also be inhibited.

INITIALIZATION &

CHARGING

{

NORMAL

OPERATION

LOW
LINE

OPERATION

NORMAL

OPERATION

POWER FAIL

OPERATION

{

= 10

= 14

VCS
WITH
DIODE

EXT
CAP

CAP
CHARGED

= 23

= 12

= 19

CAP

VCS

CLOSED

RAMP

DOWN ON

EXT CAP

VCS

CLOSED

CAP

= 20

CAP

= 35

CAP

= 40

= 10 FLAGS

ACTIVE

= 14 POWER F

AIL

FLAG

= 22VCS OPENS

CAP

= 35 CAP

CHARGED

= 18 VCS CLOSED

= 23 VCS OPENS

= 18 VCS CLOSES

= 12 POWER F

AIL

FLAG

CAP

= 20 CAP

CHARGED FLAG

V= 10 FLAGS NOT

ACTIVE

{

POWER
FAIL

OPEN

= 22

IGURE

5: HUMMER M

ODULE

IGNAL

IAGRAM

OLD

ODULE

HUMMER SERIES
40 OR 70 WATT

PIN CONNECTIONS

XTERNAL

APACITOR

ELECTION

The external capacitor supplies the energy for the DC/DC
converter's 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 =

2Pt

where

(

)

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 =

= 2790 µF

(0.80) · (40

)

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 converter's

inhibit pin as shown in Figure 3, use 20 V as the low line figure in
the formula.

IODE

ELECTION AND

ONNECTION

An external diode is required for system operation as shown in
Figure 3, with the diode anode connected to the HUMMER module's
VCS pin and the DC/DC converter's +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 module's input return pin

to the Cext return. This connection will short the module's current
limit sense resistor resulting in excessive currents that can also
damage the DC/DC converter.

NHIBIT

UNCTION

The HUMMER module's 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

OWER

AIL

LAG

The Power Fail Flag output is implemented by a comparator moni-
toring the input voltage. (The comparator is also used to inhibit
HUMMER module's 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.

APACITOR

HARGED

LAG

A Capacitor Charged Flag is implemented by a comparator moni-
toring the HUMMER module's +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.

OLD

ODULE

HUM 268621 Rev B
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 - 2003 Interpoint Corporatation. All rights reserved.

B8-12

CASE F

ASES

Materials
Header Case F1

Cold Rolled Steel/Nickel/Gold

Cases F2 - F4

Cold Rolled Steel/Nickel/Tin

Cover Case

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

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

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

IGURE

20: C

ASE

IGURE

19: C

ASE

F M

AXIMUM

IMENSIONS

Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer

to the numerical dimensions for accuracy.

B8-22

CASE J

ASES

Materials
Header Case J1

Cold Rolled Steel/Nickel/Gold

Cases J2 - J5

Cold Rolled Steel/Nickel/Tin

Cover Case

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

IGURE

35: C

ASE

J M

AXIMUM

IMENSIONS

Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer

to the numerical dimensions for accuracy.

C2-10

TEST (125°C Products)

STANDARD

/ES

/883 (Class H)*

PRE-CAP INSPECTION

Method 2017, 2032

yes

TEMPERATURE CYCLE (10 times)

Method 1010, Cond. C, -65°C to 150°C

yes

Method 1010, Cond. B, -55°C to 125°C

yes

CONSTANT ACCELERATION

Method 2001, 3000 g

yes

Method 2001, 500 g

yes

BURN-IN

Method 1015, 160 hours at 125°C

yes

96 hours at 125°C case (typical)

yes

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A

Subgroups 1 through 6: -55°C, +25°C, +125°C

yes

Subgroups 1 and 4: +25°C case

yes

HERMETICITY TESTING

Fine Leak, Method 1014, Cond. A

yes

Gross Leak, Method 1014, Cond. C

yes

Gross Leak, Dip (1 x 10

-3

)

yes

FINAL VISUAL INSPECTION

Method 2009

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 55°C to +125°C.

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°C PRODUCTS

125°C P

RODUCTS

Applies to the following products (some models do not offer "883" screening, please refer to the individual
series datasheets to determine what screening is available):

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: HUM-40

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: HUM-40