參數(shù)資料
型號： TPS54160DRCT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, SON-10
文件頁數(shù)： 21/50頁
文件大?。?/td> 1375K
代理商： TPS54160DRCT
+
2.2
F
m
2.2
F
m
0.1
F
m
332kW
61.9kW
0.01
F
m
90.9kW
C2
C3
C4
R3
R4
CSS
RT
U1
TPS54160DGQ
C1
0.1
F
m
L1
10
H
m
D1
B220A
C
OUT
47
F/6.3V
m
CF
6.8pF
RC
76.8kW
CC
2700pF
R1
31.6kW
R2
10kW
VIN
BOOT
EN
SS/TR
RT/CLK
PwPd PWRGD
VSNS
COMP
GND
PH
8-18V
3.3Vat1.5 A
SLVS795C – OCTOBER 2008 – REVISED OCTOBER 2010
www.ti.com
APPLICATION INFORMATION
Design Guide — Step-By-Step Design Procedure
This example details the design of a high frequency switching regulator design using ceramic output capacitors.
A few parameters must be known in order to start the design process. These parameters are typically determined
at the system level. For this example, we will start with the following known parameters:
Output Voltage
3.3 V
Transient Response 0 to 1.5A load step
ΔVOUT= 4%
Maximum Output Current
1.5 A
Input Voltage
12 V nom. 8 V to 18 V
Output Voltage Ripple
< 33 mVpp
Start Input Voltage (rising VIN)
7.25 V
Stop Input Voltage (falling VIN)
6.25 V
Selecting the Switching Frequency
The first step is to decide on a switching frequency for the regulator. Typically, the user will want to choose the
highest switching frequency possible since this will produce the smallest solution size. The high switching
frequency allows for lower valued inductors and smaller output capacitors compared to a power supply that
switches at a lower frequency. The switching frequency that can be selected is limited by the minimum on-time of
the internal power switch, the input voltage and the output voltage and the frequency shift limitation.
Equation 12 and Equation 13 must be used to find the maximum switching frequency for the regulator, choose
the lower value of the two equations. Switching frequencies higher than these values will result in pulse skipping
or the lack of overcurrent protection during a short circuit.
The typical minimum on time, tonmin, is 130 ns for the TPS54160. For this example, the output voltage is 3.3 V
and the maximum input voltage is 18 V, which allows for a maximum switch frequency up to 1600 kHz when
including the inductor resistance, on resistance and diode voltage in Equation 12. To ensure overcurrent
runaway is not a concern during short circuits in your design use Equation 13 or the solid curve in Figure 42 to
determine the maximum switching frequency. With a maximum input voltage of 20 V, for some margin above 18
V, assuming a diode voltage of 0.5 V, inductor resistance of 100 m
, switch resistance of 200m, a current limit
value of 2.7 A, the maximum switching frequency is approximately 2500kHz.
Choosing the lower of the two values and adding some margin a switching frequency of 1200 kHz is used. To
determine the timing resistance for a given switching frequency, use Equation 11 or the curve in Figure 40.
The switching frequency is set by resistor Rt shown in Figure 51.
Figure 51. High Frequency, 3.3V Output Power Supply Design with Adjusted UVLO.
28
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54160
相關(guān)PDF資料
PDF描述
TPS54160DGQ 2.7 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
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TPS5420MDREPG4 5.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
TPS5420MDREP 5.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
TPS54225PWP 4.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54160EVM-230 功能描述:電源管理IC開發(fā)工具 TPS54160 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
TPS54160EVM-535 功能描述:電源管理IC開發(fā)工具 Eval Mod for High Brightness LED Drvr 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
TPS54160-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.5-A 60-V STEP-DOWN SWIFT DC/DC CONVERTER WITH Eco-Mode CONTROL
TPS54160QDGQRDL 制造商:Texas Instruments 功能描述:- Tape and Reel
TPS54160QDGQRQ1 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Aut Cat 3.5-60V 1.5A Step Down Converter 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
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