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TPS40140RHHT Datasheet(PDF) 36 Page - Texas Instruments

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Part No. TPS40140RHHT
Description  Dual or 2-Phase, Stackable Controller
Download  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40140RHHT Datasheet(HTML) 36 Page - Texas Instruments

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TRCKn
SW NODE
VOUT
COMP
ILIM
2.4 V
1.5 V
0.5 V
GND
VIN
GND
VOUT, REG
GND
t0
t1
t2
t3
(A)
(B)
(C)
(D)
TPS40140
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
www.ti.com
9.1.18 Current Sensing and Balancing
The controller employs peak current mode control scheme, thus naturally provides certain degree of current
balancing. With current mode, the level of current feedback should comply with certain guidelines depending on
duty factor known as “slope compensation” to avoid the sub-harmonic instability. This requirement can prohibit
achieving a higher degree of phase current balance. To avoid the controversy, a separate current loop that
forces phase currents to match is added to the proprietary control scheme. This effectively provides high degree
of current sharing independent of the controller’s small signal response and is implemented in U3 and U22 in the
Functional Block Diagram section.
High bandwidth current amplifiers, U2 and U21 can accept as an input voltage either the voltage drop across
dedicated precise current sense resistors, or inductor’s DCR voltage derived by an RC network, or thermally
compensated voltage derived from the inductor’s DCR. The wide range of current sense arrangements ease the
cost/complexity constrains and provides superior performance compared to controllers utilizing the low-side
MOSFET current sensing.
See the Inductor DCR Current Sense section for selecting the values of the RC network.
9.1.19 Overcurrent Detection and Hiccup Mode
To reduce the input current and component dissipation during on overcurrent event, a hiccup mode is
implemented. Hiccup mode refers to a sequence of 7 soft-start cycles where no MOSFET switching occurs and
then a restart is attempted. If the fault has cleared, the restart results in returning to normal operation and
regulation. This is shown in Figure 36.
Figure 36. Hiccup Mode and Recovery
36
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Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: TPS40140


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