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TPS40140 Datasheet(PDF) 41 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) 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
5.29 DESIGN EXAMPLES INFORMATION
5.29.1 INDUCTOR DCR CURRENT SENSE
R1
L1
DCR
C1
To CSRTx
To CSx
VOUT
VIN
+
VC
R1 +
L1
DCR
C1
(17)
V
C + VIN * VOUT
V
OUT
R1
C1
f
SW
V
IN
) IOC
DCR
(18)
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
Figure 5-22. Ten-Phase System with Slave5 Not Attached
Clocking between the attached slave channels is as shown.
The preferred method for sampling the output current for the TPS40140 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 17.
The voltage into the current sense amplifier of the controller , V
C, is calculated in Equation 18.
As the DC load increases the majority of the voltage, V
C, is determined by (IOC× DCR), where IOC is the
per phase DC output current. It is important that at the overcurrent set point that the peak voltage of V
C
does not exceed 60 mV, the maximum differential input voltage. If the voltage V
C exceeds 60 mV, a
resistor, R2,can be added in parallel with C1 as shown in Figure 5-24. Adding R2 reduces the equivalent
inductor DCR by the ratio shown in Equation 20
Submit Documentation Feedback
APPLICATION INFORMATION
41


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