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TPS53851 Datasheet(PDF) 41 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) 41 Page - Texas Instruments

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M_CH1
M_CH2
S2_CH1
S1_CH2
S2_CH2
S3_CH1
S4_CH1
S3_CH2
S4_CH2
Phase
S1_CH1
S5_CH2
NOT USED
S5_CH1
NOT USED
M
R
S1
R
S2
S3
S4
ILIM 2 = hi
PHSEL connection
R1
L1
DCR
C1
To CSRTx
To CSx
VOUT
VIN
+
VC
−
R1 +
L1
DCR
C1
TPS53851
www.ti.com
SLUS985 – DECEMBER 2009
For example, a 10-phase system could be configured as shown in Figure 5-22.
Figure 5-22. Ten-Phase System with slave5 Not Attached
Clocking between the attached slave channels is as shown.
5.29 DESIGN EXAMPLES INFORMATION
5.29.1 INDUCTOR DCR CURRENT SENSE
The preferred method for sampling the output current for the TPS53851 is known as the inductor DCR
method. This is a lossless approach, as opposed to using a discrete current sense resistor which occupies
board area and impacts efficiency as well. The inductor DCR implementation is shown in Figure 5-23.
Figure 5-23. Inductor DCR Current Sense Approach
The inductor L1 consists of inductance, L, and resistance, DCR. The time constant of the inductor: L /
DCR should equal the R1×C1 time constant. Then choosing a value for C1 (0.1
μF is a good choice)
solving for R1 is shown in Equation 16.
(16)
The voltage into the current sense amplifier of the controller , VC, is calculated in Equation 17.
Copyright © 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
41
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