Datasheet

DS_DNT04SMD05_07182012
7
TEST CONFIGURATIONS
VI(+)
VI(-)
BATTERY
2
100uF
Tantalum
L
Note: Input reflected-ripple current is measured with a
simulated source inductance. Current is measured at the input
of the module.
Figure 23: Input reflected-ripple test setup
Vo
GND
10uF
tantalum
1uF
ceramic
SCOPE
Resistive
Load
Note: Use a 10μF tantalum and 1μF capacitor. Scope
measurement should be made using a BNC connector.
Figure 24: Peak-peak output noise and startup transient
measurement test setup.
VI Vo
GND
Figure 25: Output voltage and efficiency measurement test
setup
Note: All measurements are taken at the module terminals.
When the module is not soldered (via socket), place
Kelvin connections at module terminals to avoid
measurement errors due to contact resistance.
%100)( 



IiVi
IoVo

DESIGN CONSIDERATIONS
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the module. An
input capacitance must be placed close to the modules
input pins to filter ripple current and ensure module
stability in the presence of inductive traces that supply
the input voltage to the module.
Safety Considerations
For safety-agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power module
has extra-low voltage (ELV) outputs when all inputs are
ELV.
The input to these units is to be provided with an
adequate time-delay fuse in the ungrounded lead.