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參數資料
| 型號： | TPS54418RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 6.4 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 15/35頁 |
| 文件大小： | 1356K |
| 代理商： | TPS54418RTER |
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-
×
-
START
STOP
6
0.944 V
V
R1 =
2.59
10
-
×
-
+
×
6
STOP
1.18 R1
R2 =
V
1.18
R1 3.2
10
-
Vref
R7 =
R6
Vo
Vref
(
)
(
)
(
)
(
)
(
)
(
)
Voutmin
Ontimemin
Fsmax
Vinmax
Ioutmin
2
RDS
Ioutmin
RL
RDS
=
-
-
+
SLVS946A – MAY 2009 – REVISED MAY 2010
www.ti.com
BOOTSTRAP CAPACITOR SELECTION
A 0.1 mF ceramic capacitor must be connected between the BOOT to PH pin for proper operation. It is
recommended to use a ceramic capacitor with X5R or better grade dielectric. The capacitor should have 10 V or
higher voltage rating.
UNDER VOLTAGE LOCK OUT SET POINT
The Under Voltage Lock Out (UVLO) can be adjusted using an external voltage divider on the EN pin of the
TPS54418. The UVLO has two thresholds, one for power up when the input voltage is rising and one for power
down or brown outs when the input voltage is falling. For the example design, the supply should turn on and start
switching once the input voltage increases above 3.1 V (VSTART). After the regulator starts switching, it should
continue to do so until the input voltage falls below 2.8 V (VSTOP).
The programmable UVLO and enable voltages are set using a resistor divider between Vin and ground to the EN
pin. Equation 29 and Equation 30 can be used to calculate the resistance values necessary. From Equation 29
and Equation 30, a 48.7 k
between Vin and EN and a 32.4 k between EN and ground are required to produce
the 3.1 and 2.8 volt start and stop voltages.
(29)
(30)
OUTPUT VOLTAGE AND FEEDBACK RESISTORS SELECTION
For the example design, 100 k
was selected for R6. Using Equation 31, R7 is calculated as 80 k. The nearest
standard 1% resistor is 80.5 k
.
(31)
Due to the internal design of the TPS54418, there is a minimum output voltage limit for any given input voltage.
The output voltage can never be lower than the internal vlotage reference of 0.8 V. Above 0.8 V, the output
voltage may be limited by the minimum controllable on time. The minimum output voltage in this case is given by
Where:
Voutmin = minimum achieveable output voltage
Ontimemin = minimum contollable on-time (60 ns typical. 110 nsec no load)
Fsmax = maximum switching frequency including tolerance
Vinmax = maximum input voltage
Ioutmin = minimum load current
RDS = minimum high side MOSFET on resistance (30 - 44 m
)
RL = series resistance of output inductor
(32)
There is also a maximum acheivable output voltage which is limited by the minimum off time. The maximum
output voltage is given by Equation 33
22
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54418
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| TPS54519RTER | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54418RTERG4 | 制造商:Texas Instruments 功能描述: |
| TPS54418RTET | 功能描述:直流/直流開關調節器 2.95-6Vin 4A 2MHz Synch St Down 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 |
| TPS54424RNVT | 功能描述:4.5V TO 17V INPUT, CURRENT MODE, 制造商:texas instruments 系列:SWIFT?? 包裝:剪切帶（CT） 零件狀態:在售 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調式 輸出數:1 電壓 - 輸入（最小值）:4.5V 電壓 - 輸入（最大值）:17V 電壓 - 輸出（最小值/固定）:0.6V 電壓 - 輸出（最大值）:12V 電流 - 輸出:4A 頻率 - 開關:200kHz ~ 1.6MHz 同步整流器:是 工作溫度:-40°C ~ 150°C（TJ） 安裝類型:表面貼裝 封裝/外殼:18-VFQFN 供應商器件封裝:18-VQFN-HR（3.5x3.5） 標準包裝:1 |
| TPS54425 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT?) |
| TPS54425_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT?) |
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