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TPS40140 Datasheet(PDF) 50 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) 50 Page - Texas Instruments

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IN(nom)
PH
2
OUT
PH
PH
PH
2
PH
PH
sw
OUT
2
3
2
3
PH
PH
PH
PH
PH
PH
I
(N
, D) =
V
× (1- D)
k(N
, D)
k(N
, D) + 1
N
[(D -
) × (
- D)] + (
) × [
] ×
N
N
12 × D
L × f
× I
k(N
, D)
k(N
, D) + 1
[(k(N
, D) + 1) × (D -
) + k(N
, D) × (
- D) ]
N
N
(38)
6.2.3
Step 3: Peripheral Component Design
R + 1.33
39.2
103
f*1.041
SW
* 7 + 71.5 kW
(39)
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
Another important thing for the input capacitor is the RMS ripple current rating. Due to the interleaving of
multi-phase, the input RMS current is reduced. The input ripple current RMS value over load current is
calculated by:
where
• k(N
PH, D) = floor (NPH× D),in this example, k(NPH, D) =0
• Floor(x) is the function to return the greatest integer less than or equal to x
• N
PH is the number of active phases, in this example, NPH=2
So in this design, the maximum input ripple RMS current is calculated to be 7.2 A with the minimum input
voltage. It is about 34% reduction compared with a 32-A single-phase converter design. Each selected
ceramic capacitor has a RMS current rating of 4.3 A and, therefore, sufficient to reach this requirement.
6.2.3.1 Switching Frequency Setting (RT pin 5)
Here, f
swrepresents the phase switching frequency. In the design, a 64.9-kΩ resistor is selected. The
actual switching frequency is 490 kHz.
6.2.3.2 COMP1 and COMP2 (pin 35 and pin 10)
COMP1 is connected to the compensator network. The selection of compensation components is similar
to the dual output design example.
COMP2 is directly tied to COMP1.
6.2.3.3 TRK1 and TRK2 (pin 33 and pin 12)
A soft start capacitor is connected between TRK1 and GND. TRK2 is directly tied to BP5 to set this
channel as a salve.
6.2.3.4 ILIM1 and ILIM2 (pin 34 and pin 11)
ILIM1 is connected to the resistor network that has the same design as the dual output example. The peak
current in Equation 22 and Equation 23 is the peak current of each phase.
ILIM2 is grounded.
6.2.3.5 FB1 and FB2 (pin 36 and pin 9)
FB1 is tied to the feedback network. FB2 is connected to GND.
6.2.3.6 PHSEL (pin 4)
For this two phase configuration, the PHSEL pin is directly tied to GND.
6.2.3.7 PGOOD1 and PGOOD2 (pin 30 and pin 15)
Both of PGOOD1 and PGOOD2 are tied to BP5 with a 10-k
Ω resistor.
6.2.3.8 CLKIO (pin 28)
CLKIO is open as no clock synchronization required for two phase configuration.
DESIGN EXAMPLES
50
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