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DNS04SMD06 Datasheet(PDF) 8 Page - Delta Electronics, Inc.

Part No. DNS04SMD06
Description  Voltage and resistor-based trim
Download  17 Pages
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

DNS04SMD06 Datasheet(HTML) 8 Page - Delta Electronics, Inc.

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DS_DNS04SMD6A_07182012
8
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 29: 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 30: Peak-peak output noise and startup transient
measurement test setup.
VI
Vo
GND
Figure 31: 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
)
(
Ii
Vi
Io
Vo
DESIGN CONSIDERATIONS
Input Source Impedance
To maintain low noise and ripple at the input voltage, it is
critical to use low ESR capacitors at the input to the
module. Figure 32 shows the input ripple voltage (mVp-p)
for various output models using 2x100 µF low ESR
tantalum
capacitor (KEMET p/n: T491D107M016AS,
AVX p/n: TAJD107M106R, or equivalent) in parallel with
47 µF ceramic capacitor (TDK p/n:C5750X7R1C476M or
equivalent). Figure 33 shows much lower input voltage
ripple when input capacitance is increased to 400 µF (4 x
100 µF) tantalum capacitors in parallel with 94 µF (2 x 47
µF) ceramic capacitor.
The input capacitance should be able to handle an AC
ripple current of at least:
Arms
Vin
Vout
Vin
Vout
Iout
Irms
 
1
0
50
100
150
200
0
1
2
3
4
Output Voltage (Vdc)
3.3Vin
5.0Vin
Figure 32: Input voltage ripple for various output models, Io =
6A (CIN = 2
×100µF tantalum // 47µF ceramic)
0
20
40
60
80
0
1
2
3
4
Output Voltage (Vdc)
3.3Vin
5.0Vin
Figure 33: Input voltage ripple for various output models, Io =
6A (CIN = 4
×100µF tantalum // 2×47µF ceramic)


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