Texas Instruments TPS386040EVM Evaluation Module TPS386040EVM TPS386040EVM Datenbogen
Produktcode
TPS386040EVM
www.ti.com
Description
4
Description
The following paragraphs describe the functionality and operation of the TPS386000/40 EVM.
4.1
General Usage
4.1.1
Input Power
The 5VDC EVM input power is provided through J14/J16 terminals. Ensure that the correct polarity is
provided and that this input voltage does not exceed 6.0VDC. The normal operating current for the
TPS386000/40EVM will be less than 50mA when there is no load on the TPS65055 outputs. 3.3VDC EVM
input power can also be furnished at the J33 (I2C) connector through the USB-GPIO adapter when using
the TPS65055 GUI. In this case, 5VDC EVM input power is not required.
provided and that this input voltage does not exceed 6.0VDC. The normal operating current for the
TPS386000/40EVM will be less than 50mA when there is no load on the TPS65055 outputs. 3.3VDC EVM
input power can also be furnished at the J33 (I2C) connector through the USB-GPIO adapter when using
the TPS65055 GUI. In this case, 5VDC EVM input power is not required.
4.1.2
I2C Interface
An I2C interface to the TPS65055 is provided at J33. The TPS65055 internal registers and output voltages
can be modified using a GUI.
can be modified using a GUI.
4.2
On EVM Supervisor/Sequencer
The TPS386000/40 and TPS65055 are configured to provide a power-on sequence as shown in
When power is applied to the EVM, VDCDC1 rises to approximately 2.1VDC causing RESET4 to enable
DCDC2. VDCDC2 rises to approximately 1.0VDC causing RESET3 to enable LDO1. VLDO1 rises to
approximately 1.2VDC causing RESET2 to enable LDO2. VLDO2 rises to approximately 1.8VDC causing
RESET1 to enable LDO3. VLDO3 then rises to approximately 2.8V and the sequence is complete.
DCDC2. VDCDC2 rises to approximately 1.0VDC causing RESET3 to enable LDO1. VLDO1 rises to
approximately 1.2VDC causing RESET2 to enable LDO2. VLDO2 rises to approximately 1.8VDC causing
RESET1 to enable LDO3. VLDO3 then rises to approximately 2.8V and the sequence is complete.
4.2.1
Local Voltage Rails
The TPS65055 provides DC outputs from 2 switching (DCDC1 and DCDC2) and 4 linear power supplies
(LDO1-LDO4) for sequencing and monitoring. The nominal output voltages are listed in
(LDO1-LDO4) for sequencing and monitoring. The nominal output voltages are listed in
Table 5. Local Rail Nominal Output Voltages
Local Rail
VDCDC1
VDCDC2
VLDO1
VLDO2
VLDO3
VLDO4
Nominal Voltage
2.1V
1.0V
1.2V
1.8V
2.8V
1.3V
7
SLVU341 – October 2009
Evaluation Module for TPS386000 and TPS386040
Copyright © 2009, Texas Instruments Incorporated