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TPS40140 Datasheet(PDF) 38 Page - Texas Instruments

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Part No. TPS40140
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

TPS40140 Datasheet(HTML) 38 Page - Texas Instruments

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SH
LIM
V
R2
I
b + a ´
=
a ´
SH
LIM
V
R1
(1
)
I
b + a ´
=
- a ´
RAMP
C
PEAK
V
DCR
A
I
2
Nph
æ
ö
b =
´
´
+ ç
÷
´
è
ø
RAMP
IN
V
V
a =
ILIMx
VSHARE
TPS40140
R1
VOUT
R2
UDG-12123
TPS40140
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
www.ti.com
Figure 37. Selecting Overcurrent Threshold Resistors, R2 and R1
The two factors, alpha and beta help simplify the final equations and are given by Equation 13 and Equation 14.
(13)
(14)
R1 is shown in Equation 15.
(15)
R2 is shown in Equation 16.
where
•
VRAMP is the ramp amplitude (0.5 V typ)
•
VIN is the input voltage
•
DCR is the inductor equivalent DC resistance
•
AC is the gain transfer to comparator
•
IOC is the single-phase DC overcurrent trip point
•
IPEAK is the peak single-phase inductor current
•
Nph is 6 if PHSEL voltage = 1.6 V ±0.2 V, otherwise Nph = 8
•
VSH is the VSHARE reference voltage (typ 1.8 V)
•
ILIM is the current limit, output current (typ 20 μA)
•
Variable range is specified in the Electrical Characteristics table
(16)
9.1.21 Design Examples Information
9.1.21.1 Inductor DCR Current Sense
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 38.
38
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Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: TPS40140


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