UDT020A0X3-SRZ Lineage Power, UDT020A0X3-SRZ Datasheet - Page 17

• 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
Dual Layout
Identical dimensions and pin layout of Analog and
Digital Micro DLynx modules permit migration from one
to the other without needing to change the layout. In
both cases the trim resistor is connected between trim
and signal ground. The output of the analog module
cannot be trimmed down to 0.45V
Power Good
The module provides a Power Good (PGOOD) signal
that is implemented with an open-drain output to
indicate that the output voltage is within the regulation
limits of the power module. The PGOOD signal will be
de-asserted to a low state if any condition such as
overtemperature, overcurrent or loss of regulation
occurs that would result in the output voltage going
±10% outside the setpoint value. The PGOOD terminal
can be connected through a pullup resistor (suggested
value 100KΩ) to a source of 5VDC or lower.
Tunable Loop
The module has a feature that optimizes transient
response of the module called Tunable Loop
External capacitors are usually added to the output of
the module for two reasons: to reduce output ripple
and noise (see Figure 38) and to reduce output voltage
deviations from the steady-state value in the presence
of dynamic load current changes. Adding external
capacitance however affects the voltage control loop of
the module, typically causing the loop to slow down
with sluggish response.
capacitance could also cause the module to become
unstable.
The Tunable Loop
adjust the voltage control loop to match the filter
network connected to the output of the module. The
Tunable Loop
R-C between the VS+ and TRIM pins of the module,
as shown in Fig. 46. This R-C allows the user to
externally
compensation of the module.
LINEAGE
POWER
adjust
TM
TM
is implemented by connecting a series
TM
the
allows the user to externally
Larger values of external
voltage
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output current
20A Digital Micro DLynx
loop
TM
feedback
.
Recommended values of R
output capacitor combinations are given in Tables 2
and 3. Table 3 shows the recommended values of
R
capacitors up to 1000uF that might be needed for an
application to meet output ripple and noise
requirements. Selecting R
Table 3 will ensure stable operation of the module.
In applications with tight output voltage limits in the
presence of dynamic current loading, additional output
capacitance will be required. Table 3 lists
recommended values of R
meet 2% output voltage deviation limits for some
common output voltages in the presence of a 10A to
20A step change (50% of full load), with an input
voltage of 12V.
Please contact your Lineage Power technical
representative to obtain more details of this feature as
well as for guidelines on how to select the right value
of external R-C to tune the module for best transient
performance and stable operation for other output
capacitance values or input voltages other than 12V.
Table 2. General recommended values of of R
and C
ceramic capacitor combinations.
Figure. 46. Circuit diagram showing connection of
R
C
TM
TUNE
Co
R
TUNE
TUNE
: Non-isolated DC-DC Power Modules
TUME
TUNE
and C
2x47μF 4x47μF
and C
47pF
330
MODULE
for Vin=12V and various external
TUNE
TUNE
GND
for different values of ceramic output
560pF
SIG_GND
330
to tune the control loop of the
VOUT
VS+
TRIM
module.
6x47μF
TUNE
1200pF
TUNE
TUNE
270
and C
and C
and C
10x47μF
RTune
CTune
RTrim
2200pF
TUNE
220
TUNE
TUNE
according to
CO
in order to
for different
20x47μF
4700pF
180
TUNE
17