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TPS40140 Datasheet(PDF) 15 Page - Texas Instruments

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Part No. TPS40140
Description  DUAL OR 2-PHASE, STACKABLE CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40140 Datasheet(HTML) 15 Page - Texas Instruments

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5
APPLICATION INFORMATION
5.1 FUNCTIONAL DESCRIPTION
5.2 DATA SHEET ORGANIZATION
5.3 TYPICAL START UP SEQUENCE
TRKx
UVLO_CEx
BP5
VREG
0.7 V
1 .4 V
VOUT
PGOOD
VDD
SSWAIT
2.4 V
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
The TPS40140 operates with a programmable fixed switching frequency. It is a current feedback controller
with forced phase current balancing. When compared to voltage mode control, the current feedback
controller results in a simplified feedback network and reduced input line sensitivity. Phase current is
sensed by using either the DCR (direct current resistance) of the filter inductors or current sense resistors
installed in series with the output. See the section on INDUCTOR DCR CURRENT SENSE. The current
signal is then amplified and superimposed on the amplified voltage error signal to provide current mode
PWM control.
Other features include programmable input Under Voltage Lock Out (UVLO), differential input amplifier for
precise output regulation, user programmable operation frequency, programmable pulse-by-pulse
overcurrent protection, output under-voltage shutdown and re-start, capacitor to set soft-start time and
power good indicators.
The Application Information is partitioned into sections to facilitate applying the TPS40140 in various
modes and configurations. The first sections describe functions that are used in all configurations. The
following sections are specific to the configuration ( i.e., single controller, multiple controllers, Master and
Slave).
Figure 5-1 shows a typical start up with the VDD applied to the controller and then the UVLO-CEx being
enabled. Shut down occurs when the VDD is removed.
Figure 5-1. Typical Start Up and Shut Down Sequence
Submit Documentation Feedback
APPLICATION INFORMATION
15


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