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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： | 4/35頁 |
| 文件大小： | 1356K |
| 代理商： | TPS54418RTER |
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VSENSE
V
O
+
-
TPS54418
R1
R2
0.8V
EN
i1
ihys
VIN
+
-
TPS54418
R1
R2
0.6 mA
2.55 mA
-
×
-
START
STOP
6
0.944 V
V
R1 =
2.59
10
-
×
-
+
×
6
STOP
1.18 R1
R2 =
V
1.18
R1 3.2
10
Tss(mS)
Iss( A)
Css(nF) =
Vref(V)
m
SLVS946A – MAY 2009 – REVISED MAY 2010
www.ti.com
Figure 22. Voltage Divider Circuit
ENABLE AND ADJUSTING UNDER-VOLTAGE LOCKOUT
The TPS54418 is disabled when the VIN pin voltage falls below 2.6 V. If an application requires a higher
under-voltage lockout (UVLO), use the EN pin as shown in Figure 23 to adjust the input voltage UVLO by using
two external resistors. It is recommended to use the enable resistors to set the UVLO falling threshold (VSTOP)
above 2.7 V. The rising threshold (VSTART) should be set to provide enough hysteresis to allow for any input
supply variations. The EN pin has an internal pull-up current source that provides the default condition of the
TPS54418 operating when the EN pin floats. Once the EN pin voltage exceeds 1.25 V, an additional 2.55 mA of
hysteresis is added. When the EN pin is pulled below 1.18 V, the 2.55 mA is removed. This additional current
facilitates input voltage hysteresis.
Figure 23. Adjustable Under Voltage Lock Out
(2)
(3)
SLOW START PIN
The TPS54418 regulates to the lower of the SS pin and the internal reference voltage. A capacitor on the SS pin
to ground implements a slow start time. The TPS54418 has an internal pull-up current source of 1.8mA which
charges the external slow start capacitor. Equation 4 calculates the required slow start capacitor value where Tss
is the desired slow start time in ms, Iss is the internal slow start charging current of 1.8 mA, and Vref is the
internal voltage reference of 0.8 V.
(4)
12
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54418
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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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