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參數資料
| 型號： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁數： | 38/66頁 |
| 文件大小： | 1264K |
| 代理商： | TPS53851RHHT |
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V
- V
V
1
IN(max)
OUT
L =
×
I
V
f
RIPPLE
IN(max)
SW
(
)
2
I
× L
TRAN(MAX)
C
=
OUT(MIN)
V
- V
× V
IN(min)
OUT
UNDER
2
I
× L
TRAN(MAX)
C
=
OUT(MIN)
V
× V
OUT
OVER
www.ti.com
SLUS985 – DECEMBER 2009
6
DESIGN EXAMPLES
6.1
Example 1: Dual-Output Configuration from 12 V to 3.3 V and 1.5 V DC-to-DC
Converter Using a TPS53851
The following example illustrates the design process and component selection for a dual output
synchronous buck converter using TPS53851. The design goal parameters are given in Table 6-1. Only
the calculated numbers for the 1.5-V output are shown, however, the equations are suitable for both
channel design. A list of symbol definitions is found at the end of this section.
Table 6-1. Design Goal Parameters
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
VIN
Input voltage
10.8
12
13.2
V
VOUT1
Output voltage 1
1.5
V
VOUT2
Output voltage 2
3.3
V
VRIPPLE
Output ripple
IO = 20 A
2%Vo
V
IOUT1
Output current 1
20
A
IOUT2
Output current 2
20
A
fsw
Switching frequency
500
kHz
6.1.1
Step 1: Inductor Selection
The inductor is determined by the desired ripple current. The required inductor is calculated by:
(20)
Typically the peak-to-peak inductor current, IRIPPLE is selected to be around 20% of the rated output
current. In this design, IRIPPLE is targeted at 15% of IOUT1. The calculated inductor is 0.89 μH and in
practical a 1-
μH, 32-A inductor from Vishay is selected. So, the inductor ripple current is 2.66 A.
6.1.2
Step 2: Output Capacitor Selection
The output capacitor is typically selected by the output load transient response requirement. Equation 21
estimates the minimum capacitor to reach the undervoltage requirement with load step up. Equation 22
estimates the minimum capacitor for overvoltage requirement with load step down. When VIN(min) < 2
×VOUT, the minimum output capacitance can be calculated using Equation 21. Otherwise, Equation 22 is
used.
(21)
when VIN(min) < 2 × VOUT
(22)
when VIN(min) > 2×VOUT
In this design, VIN(min) is much larger than 2 × VOUT, so Equation 22 is used to determine the minimum
capacitance. Based on a 10-A load transient with a maximum of 80-mV deviation, a minimum 833-
μF
output capacitor is required. In the design, four 220-
μF, 4-V, SP capacitor are selected to meet this
requirement. Each capacitor has an ESR of 5 m
.
Another criterion for capacitor selection is the output ripple voltage. The output ripple is determined mainly
by the capacitance and the ESR.
Copyright 2009, Texas Instruments Incorporated
DESIGN EXAMPLES
43
Product Folder Link(s): TPS53851
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| TPS5401 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:0.5-A, 42-V Input, Step-Down SWIFT? Converter |
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