HUMMER MODULE
40 OR 70 WATTS
1
F
EATURES
55C to +125C
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
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.
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
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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
2
H
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ABSOLUTE MAXIMUM RATINGS
Input Voltage Range
12 to 40 VDC continuous
Case Operating Temperature (Tc)
55 to +125C 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)
300C
Storage Temperature Range (Case)
65C to +135C
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: 25C 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
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.
10
9
8
7
6
1
2
3
4
5
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
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MODEL NUMBERING KEY
4
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 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.
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
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HUMMER SERIES
40 OR 70 WATTS
5
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 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
F
AIL
O
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
{
--
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 F
AIL
FLAG
V
IN
= 22VCS 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 F
AIL
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
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