UDT020A0X3-SRZ Lineage Power, UDT020A0X3-SRZ Datasheet - Page 14

• 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
Analog Feature Descriptions
Remote On/Off
The module can be turned ON and OFF either by
using the ON/OFF pin (Analog interface) or through
the PMBus interface (Digital). The module can be
configured in a number of ways through the PMBus
interface to react to the two ON/OFF inputs:
The default state of the module (as shipped from the
factory) is to be controlled by the analog interface only.
If the digital interface is to be enabled, or the module is
to be controlled only through the digital interface, this
change must be made through the PMBus. These
changes can be made and written to non-volatile
memory on the module so that it is remembered for
subsequent use.
Analog On/Off
The 20A Digital Micro DLynx
an On/Off pin for remote On/Off operation. Two
On/Off logic options are available. In the Positive
Logic On/Off option, (device code suffix “4” – see
Ordering Information), the module turns ON during a
logic High on the On/Off pin and turns OFF during a
logic Low. With the Negative Logic On/Off option, (no
device code suffix, see Ordering Information), the
module turns OFF during logic High and ON during
logic Low. The On/Off signal should be always
referenced to ground. For either On/Off logic option,
leaving the On/Off pin disconnected will turn the
module ON when input voltage is present.
For positive logic modules, the circuit configuration for
using the On/Off pin is shown in Figure 39. When the
external transistor Q2 is in the OFF state, the internal
transistor Q7 is turned OFF, which keeps Q6 OFF and
Q5 OFF. This allows the internal PWM #Enable signal
to be pulled up by the internal 3.3V, thus turning the
module ON. When transistor Q2 is turned ON, the
On/Off pin is pulled low, which turns Q7, Q6 and Q5
ON and the internal PWM #Enable signal is pulled low
and the module is OFF. A suggested value for R
20kΩ.
For negative logic On/Off modules, the circuit
configuration is shown in Fig. 40. The On/Off pin
should be pulled high with an external pull-up resistor
(suggested value for the 3V to 14V input range is
20Kohms). When transistor Q2 is in the OFF state, the
On/Off pin is pulled high, transistor Q3 is turned ON.
This turns Q6 ON, followed by Q5 turning ON which
pulls the internal ENABLE low and the module is OFF.
To turn the module ON, Q2 is turned ON pulling the
On/Off pin low, turning transistor Q3 OFF, which keeps
LINEAGE
•
•
•
Module ON/OFF can be controlled only
through the analog interface (digital interface
ON/OFF commands are ignored)
Module ON/OFF can be controlled only
through the PMBus interface (analog
interface is ignored)
Module ON/OFF can be controlled by either
the analog or digital interface
POWER
TM
power modules feature
20A Digital Micro DLynx
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 20A output
pullup
is
Q6 and Q5 OFF resulting in the PWM Enable pin
going high.
Digital On/Off
Please see the Digital Feature Descriptions
section.
+VIN
Figure 39. Circuit configuration for using positive
On/Off logic.
+VIN
Figure 40. Circuit configuration for using negative
On/Off logic.
Monotonic Start-up and Shutdown
The module has monotonic start-up and shutdown
behavior for any combination of rated input voltage,
output current and operating temperature range.
Startup into Pre-biased Output
The module can start into a prebiased output as long
as the prebias voltage is 0.5V less than the set output
voltage.
Analog Output Voltage Programming
The output voltage of the module is programmable to
any voltage from 0.6dc to 5.5Vdc by connecting a
resistor between the Trim and SIG_GND pins of the
module. Certain restrictions apply on the output
voltage set point depending on the input voltage.
These are shown in the Output Voltage vs. Input
Voltage Set Point Area plot in Fig. 41. The Upper Limit
curve shows that for output voltages lower than 1V, the
input voltage must be lower than the maximum of
14.4V. The Lower Limit curve shows that for output
voltages higher than 0.6V, the input voltage needs to
TM
Q2
Q2
: Non-isolated DC-DC Power Modules
Rpullup
Rpullup
I
V
I
V
ON/OFF
ON/OFF
ON/OFF
ON/OFF
+
_
+
_
DLYNX MODULE
GND
DLYNX MODULE
GND
22K
22K
22K
22K
Q3
100K
100K
Q7 10K
10K
2K
Q6
2K
Q6
20K
20K
20K
20K
Q5
Q5
20K
20K
14
3.3V
ENABLE
ENABLE
3.3V