參數(shù)資料
型號(hào)： TPS54318RTET
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 5.5 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, PLASTIC, QFN-16
文件頁(yè)數(shù)： 4/36頁(yè)
文件大?。?/td> 1388K
代理商： TPS54318RTET
O
0.8 V
R2 = R1
V
0 .8 V
÷
-
è
VSENSE
V
O
+
-
TPS54318
R1
R2
0.8V
EN
i1
ihys
VIN
+
-
TPS54318
R1
R2
0.6 mA
2.55 mA
SLVS975 – SEPTEMBER 2009 ......................................................................................................................................................................................... www.ti.com
VOLTAGE REFERENCE
The voltage reference system produces a precise ±1% voltage reference overtemperature by scaling the output
of a temperature stable bandgap circuit. The bandgap and scaling circuits produce 0.8 V at the non-inverting
input of the error amplifier.
ADJUSTING THE OUTPUT VOLTAGE
The output voltage is set with a resistor divider from the output node to the VSENSE pin. It is recommended to
use divider resistors with 1% tolerance or better. Start with a 100 k
for the R1 resistor and use the Equation 1
to calculate R2. To improve efficiency at light loads consider using larger value resistors. If the values are too
high the regulator is more susceptible to noise and voltage errors from the VSENSE input current are noticeable.
(1)
Figure 22. Voltage Divider Circuit
ENABLE AND ADJUSTING UNDERVOLTAGE LOCKOUT
The TPS54318 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
TPS54318 operating when the EN pin floats. Once the EN pin voltage exceeds 1.25 V, an additional 2.55
μA of
hysteresis is added. When the EN pin is pulled below 1.18 V, the 2.55
μA is removed. This additional current
facilitates input voltage hysteresis.
Figure 23. Adjustable Undervoltage Lock Out
12
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS54318
相關(guān)PDF資料
PDF描述
TPS54318RTER 5.5 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16
TPS54319RTER SWITCHING REGULATOR, PQCC16
TPS54319RTE SWITCHING REGULATOR, PQCC16
TPS54326PWP 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14
TPS54326RGTR 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PQCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54318RTET 制造商:Texas Instruments 功能描述:Voltage Regulator IC 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN SWITCHER, QFN-16
TPS54319 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFTa?￠)
TPS54319_1 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFTa?￠)
TPS54319EVM-626 功能描述:電源管理IC開(kāi)發(fā)工具 Evaluation Module for TPS54319 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS54319RTE 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFT?)
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