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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 46/66頁 |
| 文件大?。?/td> | 1264K |
| 代理商： | TPS53851RHHT |
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PH
N
PH
i=1
OUT
PH
N
-1
PH
i=1
i - N
× D
I
(N , D) =
( i - N
× D + 1)
I
RIPPLE +
V
OUT
L
f
SW
DIOUT NPH, D + 4.374 A
SLUS985 – DECEMBER 2009
www.ti.com
6.2
Example 2: Two-Phase Single Output Configuration From 12 V to 1.5 V DC/DC
Converter Using a TPS53851
The following example illustrates the design process and component selection for a two-phase single
output synchronous buck converter using TPS53851. The design goal parameters are given in Table 6-2.
The inductor and MOSFET selection equations are quite similar to the dual output converter design, so
they are not repeated here.
Table 6-2. Design Goal Parameters
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
VIN
Input Voltage
10.8
12
13.2
V
VOUT
Output voltage
1.5
V
VRIPPLE
Output ripple
IO = 32A
2%Vo
V
IOUT1
Output current
32
A
fsw
Switching frequency
500
kHz
6.2.1
Step 1: Output Capacitor Selection
The output capacitor is typically selected by the output load transient response requirement. Equation 22
in the dual output design example is used. The inductor L in the equation is equal to the phase inductance
divided by number of phases.
Based on a 15-A load transient with a maximum of 30 mV deviation, a minimum 1.32-
μF output capacitor
is required. In the design, four 330-
μF, 2 V, SP capacitor are selected to meet this requirement. Each
capacitor has an ESR of 6 m
.
Another criterion for capacitor selection is the output ripple voltage that is determined mainly by the
capacitance and the ESR.
Due to the interleaving of channels, the total output ripple current is smaller than the ripple current from a
single phase. The ripple cancellation factor is expressed in Equation 56.
(56)
Where:
D is the duty cycle for a single phase
NPH is the number of active phases, here it is equal to 2
Then the maximum output ripple current is calculated by:
(57)
With 1.32 mF output capacitance, the ripple voltage at the capacitor is calculated to be 828
μV. In the
specification, the output ripple voltage should be less than 30mV, so based on Equation 23, the required
maximum ESR is 6.7 m
. The selected capacitors can meet this requirement.
6.2.2
Step 2: Input Capacitor Selection
The input voltage ripple depends on the input capacitance and the ESR. The minimum capacitor and the
maximum ESR can be estimated by Equation 24 and Equation 25 in the dual output design example.
50
DESIGN EXAMPLES
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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