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參數資料
| 型號： | TPS55383PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 7 A DUAL SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-26 |
| 文件頁數： | 11/45頁 |
| 文件大小： | 1318K |
| 代理商： | TPS55383PWPRG4 |
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Inductor Selection
IN
OUT
V
- V
L
I
=
D
(3)
Maximum Output Capacitance
(
)
SS
CLx
RIPPLE
LOAD
OUT max
OUT
t
1
C
I
V
2
=
-
-
÷
÷
è
è
(4)
Minimum Output Capacitance
Compensation For The Feedback Loop
(
)
600000
Fm
TPS55386
6
1.5
10
t
V
- V
ON
-6
IN
OUT
19.7
e
50
10
L
=
é
ù
ê
ú
+
÷
ê
ú
÷
è
ê
ú
(5)
www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008
Calculate the inductance value so that an output ripple current between 300 mA and 900 mA results. Lower
ripple current results in discontinuous mode (DCM) operation at a lower DC load current, while higher ripple
current generally allows for higher closed loop bandwidth.
NOTE:
For wide input range converters, highest input voltage results in the highest ripple
current.
NOTE:
The load current at which the overcurrent protection (OCP) engages is dependent on
the amount of ripple current, because it is the peak current in the switch that is
monitored. See Output Overload Protection.
With internal pulse-by-pulse current limiting and a fixed soft-start time, there is a maximum output capacitance
which may be used before startup problems begin to occur. If the output capacitance is large enough so that the
device enters a current-limit protection mode during startup, then there is a possibility that the output never
reaches regulation. Instead, the TPS5538x simply shuts down and attempts a restart as if the output were
short-circuited to ground. The maximum output capacitance (including bypass capacitance distributed at the
load) is given by Equation 4:
Ensure the value of capacitance selected for closed-loop stability is compatible with the requirements of Soft
To determine the components necessary for compensating the feedback loop, the controller frequency response
characteristics must be understood and the desired crossover frequency selected. The best results are obtained
if 10% of the switching frequency is used as this closed loop crossover frequency. In some cases, up to 20% of
the switching frequency is also possible.
With the output filter components selected, the next step is to calculate the DC gain of the modulator. For the
TPS55386:
The gain of the TPS55383 modulator is approximated by:
Copyright 2008, Texas Instruments Incorporated
19
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS55386EVM-363 | 功能描述:電源管理IC開發工具 TPS55386EVM-363 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS55386PWP | 功能描述:直流/直流開關調節器 3A Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS55386PWPG4 | 功能描述:直流/直流開關調節器 3A,Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS55386PWPR | 功能描述:直流/直流開關調節器 3A Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS55386PWPRG4 | 功能描述:直流/直流開關調節器 3A,Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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