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TPS40322 Datasheet(PDF) 15 Page - Texas Instruments

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Part No. TPS40322
Description  Dual Output or Two-Phase Synchronous Buck Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40322 Datasheet(HTML) 15 Page - Texas Instruments

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UDG-11113
COMP2
FB2
EN2/SS2/GSNS
ILIM2/VSNS
DIFFO
BP6
+
R
R
R
R
L
O
A
D
RPARASITIC
VSNS
GSNS
Power Stage
RPARASITIC
+
FB1
COMP1
COMP1
VREF
TPS40322
www.ti.com
SLUSAF8
– JUNE 2011
Multi-Phase Mode and Current Sharing Loop
The TPS40322 can be configured to operate in single-output multi-phase mode for high-current applications.
With proper selection of the external MOSFETs, this device can support up to 50-A of load current in a
multi-phase configuration. As shown in Figure 18, to configure TPS40322 as multi-phase mode, FB2 is tied to
BP6. In this mode, COMP1 must be connected to COMP2 to ensure current sharing between the two phases.
For high-current applications, the remote sense amplifier is used to compensate for the parasitic offset to provide
an accurate output voltage. The EN2/SS2 and ILIM2 pins are designed for multiple functions. They are used as
VSNS and GSNS for remote sensing in a multi-phase mode. DIFFO, which is the output of the remote sensing
amplifier, is connected to the resistor divider of the feedback network.
Figure 18. Multi-phase Mode Configuration
When the device operates in multi-phase mode, a current sharing loop as shown in Figure 19 is designed to
maintain the current balance between phases. Both phases share the same comparator voltage (COMP1). The
sensed current in each phase is compared first in a current share block, then an error current and fed into
COMP. The resulted error voltage is compared with the voltage ramp to generate the PWM pulse.
Copyright
© 2011, Texas Instruments Incorporated
15


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