UDT020A0X3-SRZ Lineage Power, UDT020A0X3-SRZ Datasheet - Page 13

• Manufacturer Part Number: UDT020A0X3-SRZ
• Description: DC/DC Converters & Regulators 3-14.4Vin .6-5.5Vout 20A Neg SMT Digital
• Manufacturer: Lineage Power

Specifications of UDT020A0X3-SRZ

• Product: Non-Isolated / POL
• Input Voltage Range: 3 VDC to 14.4 VDC
• Input Voltage (nominal): 12 V
• Output Voltage (channel 1): 0.6 VDC to 5.5 VDC
• Output Current (channel 1): 20 A
• Output Voltage: 0.6 VDC to 5.5 VDC
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Preliminary Data Sheet
May 10, 2011
Design Considerations
Input Filtering
The 20A Digital Micro DLynx
connected to a low ac-impedance source. A highly
inductive source can affect the stability of the
module. An input capacitance must be placed
directly adjacent to the input pin of the module, to
minimize input ripple voltage and ensure module
stability.
are recommended at the input of the module. Figure
37 shows the input ripple voltage for various output
voltages at 20A of load current with 2x22 µF or 3x22
µF ceramic capacitors and an input of 12V.
Figure 37. Input ripple voltage for various
output voltages with 2x22 µF or 3x22 µF ceramic
capacitors at the input (20A load). Input voltage
is 12V.
Output Filtering
These modules are designed for low output ripple
voltage and will meet the maximum output ripple
specification with 0.1 µF ceramic and 2x47 µF ceramic
capacitors at the output of the module. However,
additional output filtering may be required by the
system designer for a number of reasons. First, there
may be a need to further reduce the output ripple and
noise of the module. Second, the dynamic response
characteristics may need to be customized to a
particular load step change.
To reduce the output ripple and improve the dynamic
response to a step load change, additional
capacitance at the output can be used. Low ESR
polymer and ceramic capacitors are recommended to
improve the dynamic response of the module. Figure
38 provides output ripple information for different
external capacitance values at various Vo and a full
load current of 20A. For stable operation of the
module, limit the capacitance to less than the
maximum output capacitance as specified in the
electrical specification table. Optimal performance of
the module can be achieved by using the Tunable
Loop
LINEAGE
To minimize input voltage ripple, ceramic capacitors
TM
450
400
350
300
250
200
150
100
50
feature described later in this data sheet.
0
0.5
POWER
1
2x22uF
3x22 uF
Output Voltage (Vdc)
1.5
2
TM
2.5
module should be
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
20A Digital Micro DLynx
3
3.5
4
4.5
5
Figure 38. Output ripple voltage for various output
voltages with external 2x47 µF, 4x47 µF or 6x47 µF
ceramic capacitors at the output (20A load). Input
voltage is 12V.
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, i.e., UL 60950-1 2nd, CSA C22.2 No.
60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805
Teil 1 + A11):2009-11; EN 60950-1:2006 + A11:2009-
03.
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 UDT020A0X series were tested using an external
Littelfuse 456 series fast-acting fuse rated at 30 A, 100
Vdc in the ungrounded input.
TM
70
60
50
40
30
20
10
: Non-isolated DC-DC Power Modules
0
0.5
1
1.5
2x47uF Ext Cap
4x47uF Ext Cap
6x47uF Ext Cap
8x47uF Ext Cap
Output Voltage(Volts)
2
2.5
3
3.5
4
4.5
13
5