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| 型號(hào)： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁(yè)數(shù)： | 47/66頁(yè) |
| 文件大?。?/td> | 1264K |
| 代理商： | TPS53851RHHT |
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IN(nom)
PH
2
OUT
PH
2
PH
sw
OUT
2
3
2
3
PH
I
(N , D) =
V
× (1- D)
k(N , D)
k(N , D) + 1
N
[(D -
) × (
- D)] + (
) × [
] ×
N
12 × D
L × f
× I
k(N , D)
k(N , D) + 1
[(k(N , D) + 1) × (D -
) + k(N , D) × (
- D) ]
N
R + 1.33
39.2
103
f*1.041
SW
* 7 + 71.5 kW
www.ti.com
SLUS985 – DECEMBER 2009
For this design, VRIPPLE(CIN) assume is 100mV and VRIPPLE(CinESR) is 50mV, also the inductor ripple current
IRIPPLE is 30%, so the calculated minimum capacitance is 40μF and the maximum ESR is 2.7 m.
Choosing four 22-
μF, 16-V, 2-m ESR ceramic capacitors meet this requirement.
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:
(58)
where
k(NPH, 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
NPH 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
Step 3: Peripheral Component Design
6.2.3.1
Switching Frequency Setting (RT pin 5)
(59)
Here, fswrepresents the phase switching frequency. In the design, a 64.9-k 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 slave
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 41 and Equation 42 is the peak current of each phase.
ILIM2 is connected to GND.
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.
Copyright 2009, Texas Instruments Incorporated
DESIGN EXAMPLES
51
Product Folder Link(s): TPS53851
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