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TPS53851 Datasheet(PDF) 25 Page - Texas Instruments

Part No. TPS53851
Description  DUAL OR 2-PHASE, STACKABLE CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS53851 Datasheet(HTML) 25 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)
TPS53851
www.ti.com
SLUS985 – DECEMBER 2009
5.24 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, ICTLR.
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 sectionfor selecting the values of the RC network.
5.25 OVERCURRENT DETECTION AND HICCUP MODE
In order 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 re-start is attempted. If the fault has cleared, the re-start results in returning to
normal operation and regulation. This is shown in Figure 5-9.
Figure 5-9. Hiccup Mode and Recovery
Copyright © 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
25
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