F
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
H
OLD
U
P
M
ODULE
28 V
OLT
I
NPUT
HUMMER MODULE
40 OR 70 WATTS
MODELS
P
OWER
O
UTPUT
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.
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.
B6-3
HUMMER SERIES
40 OR 70 WATTS
ABSOLUTE MAXIMUM RATINGS
H
OLD
U
P
M
ODULE
SYNC AND INHIBIT
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
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
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 12 to 40 VDC continuous
Case Operating Temperature (Tc)
• –55 to +125°C full power
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
HUM-40
PARAMETER
OUTPUT VOLTAGE
OUTPUT POWER
INPUT VOLTAGE
INPUT RIPPLE CURRENT
INPUT CURRENT
CONDITION
CEXT TERMINAL
CONTINUOUS
PEAK, 2 SEC
CONTINUOUS
TRANSIENT 50 ms
2 MHz Bandwidth
V
IN
= 28V, VCS OPEN
V
IN
= 28V, INHIBITED
V
IN
= 12V, FULL LOAD
V
IN
= 40V, FULL LOAD
EFFICIENCY
V
IN
= 22V, FULL LOAD
V
IN
= 12V, FULL LOAD
HOLD-UP TIME
POWER FAIL
FLAG THRESHOLD
CAPACITOR VOLTAGE
CONTROLLED SWITCH
CAP CHARGED
FLAG THRESHOLD
FULL LOAD
HIGH, OPEN CIRCUIT
LOW, SHORT RETURN
OPEN
CLOSED
HIGH, OPEN CIRCUIT
LOW, SHORT RETURN
MIN
39
—
—
12
—
—
—
—
—
92
87
80
15
14.0
11.5
22
18
34
19.5
MAX
40
40
60
50
80
100
90
10
4.6
—
—
—
—
14.5
12.0
24
19
36
20.5
HUM-70
MIN
39
—
—
12
—
—
—
—
—
92
87
80
8.6
14.0
11.5
22
18
34
19.5
MAX
40
70
100
50
80
100
90
10
8.6
—
—
—
—
14.5
12.0
24
19
36
20.5
VDC
VDC
µs/µF
VDC
%
VDC
V
mA p-p
mA
A
UNITS
VDC
W
Notes
1. Full load for specifications is 40 W for HUM-40 and 70 W for HUM-70.
B6-4
H
OLD
U
P
M
ODULE
PIN OUT
Pin
1
2
3
4
5
6
7
8
9
10
11
12
HUM-40 (40 Watt)
No connection
VCS (Voltage Control Switch)
+ CEXT (Ext. Capacitor, Positive)
CEXT Return (Ext. Capacitor, Return)
Input Common
Positive Input
Case Ground
Cap Charged Flag
Inhibit
Power Fail Flag
N/A
N/A
HUM-70 (70 Watt)
HUMMER SERIES
40 OR 70 WATT
Sync
Cap Charged Flag
Inhibit
Power Fail Flag
No connection
No connection
VCS (Voltage Control Switch)
+ CEXT (Ext. Capacitor, Positive)
CEXT Return (Ext. Capacitor, Return)
Input Common
Positive Input
No connection
Dot on top of cover indicates pin one.
Angled corner indicates pin one.
1
2
3
4
5
1
2
3
4
12
BOTTOM VIEW
HUM-40
FLANGED AND NON-FLANGED
See Section B8, cases F2,
and J2, for dimensions.
9
8
7
TOP VIEW
HUM-70
(Pin side, marked side)
See Section B8, case U1, for dimensions.
11
10
9
8
7
10
6
5
6
Dotted line outlines flanged package option.
F
IGURE
1: HUM-40 P
IN
O
UT
F
IGURE
2: HUM-70 P
IN
O
UT
MODEL NUMBERING KEY
HUM - 40
Base Model
Output Power
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
F
/
ES
Base Model
Output Power
Screening
(Standard screening has no designator
in this position.)
HUM - 70 / ES
B6-5
HUMMER SERIES
40 OR 70 WATT
28 VDC
EMI
FILTER
(IF USED)
H
OLD
U
P
M
ODULE
DC-DC
CONVERTER
LOAD
+V
IN
HUMMER
VCS
HOLD-UP
MODULE
CAPACITOR
CHARGED
+C
EXT
C
EXT1
+V
IN
INHIBIT
+V
OUT
28 VDC
RETURN
V
IN
RETURN
V
OUT
RETURN
CASE
GROUND
C
EXT
RETURN
V
IN
RETURN
POWER
FAIL
INHIBIT
1. EXTERNAL HOLDUP
CAPACITOR
F
IGURE
3: HUMMER M
ODULE
S
YSTEM
B
LOCK
D
IAGRAM
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.
VCS
+V
IN
INPUT
CURRENT
LIMIT
+C
EXT
+
–
PWM
+
–
V
IN
RETURN
CASE
GROUND
+
–
C
EXT
RETURN
CURRENT
SENSE
POWER
FAIL
INHIBIT CAPACITOR
CHARGED
F
IGURE
4: HUMMER M
ODULE
B
LOCK
D
IAGRAM
B6-6
H
OLD
U
P
M
ODULE
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.
HUMMER SERIES
40 OR 70 WATTS
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.
30 –
—
V
IN
= 22
V
IN
20 –
10 –
0–
—
V
IN
= 14
—
V
IN
= 10
V
IN
= 19
—
—
V
IN
= 23
V
IN
= 19
—
—
V
IN
= 12
40 –
30 –
VCS
WITH
DIODE
20 –
10 –
0–
VCS
CLOSED
—
V
CAP
—
V
CAP
V
IN
V
IN
VCS
CLOSED
RAMP
DOWN ON
EXT CAP
40 –
30 –
EXT
CAP
20 –
10 –
0–
V
CAP
= 35
—
—
V
CAP
= 40
V
CAP
= 20
—
POWER
FAIL
CAP
CHARGED
OPEN
0–
V
CAP
= 20 – CAP CHARGED FLAG
0–
V
IN
= 10 – FLAGS ACTIVE
V
IN
= 14 – POWER FAIL FLAG
V
IN
= 12 – POWER FAIL FLAG
V
CAP
= 35 – CAP CHARGED
{
INITIALIZATION &
CHARGING
V
IN
= 18 – VCS CLOSES
V
IN
= 23 – VCS OPENS
V
IN
= 22–VCS OPENS
NORMAL
LOW
OPERATION LINE
OPERATION
{
NORMAL
OPERATION
F
IGURE
5: HUMMER M
ODULE
S
IGNAL
D
IAGRAM
{
POWER FAIL
OPERATION
{
{
V= 10 – FLAGS NOT ACTIVE
V
IN
= 18 – VCS CLOSED
B6-7
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