DNL04S0A0S16PFD Delta Electronics, Inc., DNL04S0A0S16PFD Datasheet - Page 8

• Manufacturer Part Number: DNL04S0A0S16PFD
• Description: Delphi Dnl, Non-isolated Point Of Load Dc/dc Power Modules 2.8-5.5vin, 0.75-3.3v/16a Out
• Manufacturer: Delta Electronics, Inc.

TEST CONFIGURATIONS
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
Note: Use a 10μF tantalum and 1μF capacitor. Scope
measurement should be made using a BNC cable.
Figure 30: Peak-peak output noise and startup transient
Figure 31: Output voltage and efficiency measurement test
Note: All measurements are taken at the module
DS_DNL04SMD16A_03052009
BATTERY
SUPPLY
CONTACT RESISTANCE
terminals. When the module is not soldered (via
socket), place Kelvin connections at module
terminals to avoid measurement errors due to
contact resistance.
I
I
GND
measurement test setup.
setup
Vo
η
TO OSCILLOSCOPE
=
(
Vin
Vo
Vi
COPPER STRIP
V
GND
tantalum
×
×
10uF
I
Io
Ii
L
Vo
)
Vo
Tantalum
2
×
ceramic
1uF
100
100uF
DISTRIBUTION LOSSES
CONTACT AND
SCOPE
Io
%
V
V
LOAD
Resistive
I
Load
I
(+)
(-)
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 200 µF(2 x100uF) 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:
Figure 32: Input voltage ripple for various output models, IO = 16 A
(CIN = 2
Figure 33: Input voltage ripple for various output models, IO = 16 A
(CIN = 4
Irms
350
300
250
200
150
100
200
150
100
50
=
50
0
×
×
0
Iout
0
100 µF tantalum // 47 µF ceramic)
100 µF tantalum // 2
0
Vout
Vin
1
⎛
⎜
⎝
1
1
Output Voltage (Vdc)
−
Vout
Vin
Output Voltage (Vdc)
×
47 µF ceramic)
2
⎞
⎟
⎠
2
Arms
3
3
3.3Vin
5.0Vin
3.3Vin
5.0Vin
4
8
4