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參數(shù)資料
| 型號： | TPS54429ERSAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.01 A SWITCHING REGULATOR, PQCC16 |
| 封裝： | PLASTIC, QFN-16 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大小： | 907K |
| 代理商： | TPS54429ERSAT |
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Ilp-p=
V
OUT
V
IN(max)
V
-V
IN(max)
OUT
L
f
O
SW
I
=I +
lpeak
O
Ilp-p
2
I
=
Lo(RMS)
√
I +
O
2
1
12 Ilp-p
2
I
=
CO(RMS)
V
OUT
(
)
V-V
IN
OUT
V
IN
L
O
f
SW
√12
SLVSAS0 –FEBRUARY 2011
At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal
gain of the TPS54429E. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain
rolls off at a -40 dB per decade rate and the phase drops rapidly. D-CAP2 introduces a high frequency zero
that reduces the gain roll off to -20 dB per decade and increases the phase to 90 degrees one decade above the
zero frequency. The inductor and capacitor selected for the output filter must be selected so that the double pole
of Equation 5 is located below the high frequency zero but close enough that the phase boost provided be the
high frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the
values recommended in Table 1
Table 1. Recommended Component Values
Output Voltage (V)
R1 (k
Ω)
R2 (k
Ω)
C4 (pF)(1)
L1 (
H)
C8 + C9 (
F)
1
6.81
22.1
1.5
22 - 68
1.05
8.25
22.1
1.5
22 - 68
1.2
12.7
22.1
1.5
22 - 68
1.5
23.2
22.1
1.5
22 - 68
1.8
30.1
22.1
10 - 22
2.2
22 - 68
2.5
49.9
22.1
10 - 22
2.2
22 - 68
3.3
73.2
22.1
10 - 22
2.2
22 - 68
5
121
22.1
10 - 22
3.3
22 - 68
(1) Optional
For higher output voltages at or above 1.8 V, additional phase boost can be achieved by adding a feed forward
capacitor (C4) in parallel with R1.
The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 6,
Equation 7 and Equation 8. The inductor saturation current rating must be greater than the calculated peak
current and the RMS or heating current rating must be greater than the calculated RMS current. Use 700 kHz for
fSW.
(6)
(7)
(8)
For this design example, the calculated peak current is 4.97A and the calculated RMS current is 4.508 A. The
inductor used is a TDK SPM6530-1R5M100 with a peak current rating of 11.5 A and an RMS current rating of 11
A.
The capacitor value and ESR determines the amount of output voltage ripple. The TPS54429E is intended for
use with ceramic or other low ESR capacitors. Recommended values range from 22uF to 68uF. Use Equation 9
to determine the required RMS current rating for the output capacitor
(9)
For this design two TDK C3216X5R0J226M 22uF output capacitors are used. The typical ESR is 2 mΩ each.
The calculated RMS current is .271A and each output capacitor is rated for 4A.
Input Capacitor Selection
The TPS54429E requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A ceramic capacitor over 10 F is recommended for the decoupling capacitor. An additional 0.1 F
capacitor from pin 14 to ground is recommended to improve the stability of the over-current limit function. The
capacitor voltage rating needs to be greater than the maximum input voltage.
14
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS54429E
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| TPS54429EVM-608 | 功能描述:電源管理IC開發(fā)工具 TPS54429 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54429PWP | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 7V-18Vin,4.5A Sync Step-Down DCAP2 Mode RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54429PWPR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 7V-18Vin,4.5A Sync Step-Down DCAP2 Mode RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54478 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 4-A Output, 2-MHz, Synchronous Step-Down |
| TPS54478EVM-037 | 功能描述:電源管理IC開發(fā)工具 TPS54478 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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