Data Sheet
September 23, 2011
QBVW033A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 33A Output Current
Test Configurations
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance source. Highly inductive source impedance
can affect the stability of the power module. For the test
configuration in Figure 11, a 100μF electrolytic capacitor,
C
in
, (ESR<0.7 at 100kHz), mounted close to the power
module helps ensure the stability of the unit.
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be installed
in compliance with the spacing and separation
requirements of the end-use safety agency standard, i.e.,
nd
nd
UL60950-1 2 Ed., CSA C22.2 No. 60950-1 2 Ed., and
nd
VDE0805-1 EN60950-1 2 Ed.
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75Vdc), for the module’s output to be considered as
meeting the requirements for safety extra-low voltage
(SELV), all of the following must be true:
The input source is to be provided with reinforced
insulation from any other hazardous voltages,
including the ac mains.
Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or
tantalum capacitor. Scope measurement should be made
using a BNC socket. Position the load between
51 mm and 76 mm (2 in. and 3 in.) from the module.
Note: Measure input reflected-ripple current with a simulated
source inductance (LTEST) of 12 µH. Capacitor CS offsets
possible battery impedance. Measure current as shown above.
Figure 11. Input Reflected Ripple Current Test Setup.
One V
IN
pin and one V
OUT
pin are to be grounded, or
both the input and output pins are to be kept floating.
The input pins of the module are not operator
accessible.
Another SELV reliability test is conducted on the whole
system (combination of supply source and subject
module), as required by the safety agencies, to verify
that under a single fault, hazardous voltages do not
appear at the module’s output.
Figure 12. Output Ripple and Noise Test Setup.
CONT
ACT AND
DISTRIBUTION LOSSES
V
I
(+)
I
I
SUPPL
Y
V
I
(–)
CONT
ACT
RESIST
ANCE
V
O2
V
O1
I
O
LOAD
Note:
Do not ground either of the input pins of the module
without grounding one of the output pins. This may
allow a non-SELV voltage to appear between the
output pins and ground.
The power module has safety extra-low voltage (SELV)
outputs when all inputs are SELV.
The input to these units is to be provided with a maximum
30 A fast-acting (or time-delay) fuse in the ungrounded
input lead.
The optional heat-plate is considered secondary from a
spacing perspective between input and output.
Note: All measurements are taken at the module terminals. When
socketing, place Kelvin connections at module terminals to avoid
measurement errors due to socket contact resistance.
Figure 13. Output Voltage and Efficiency Test Setup.
LINEAGE
POWER
7
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
