參數(shù)資料
型號(hào)： TPS51511RHLT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PQCC20
封裝： ROHS COMPLIANT, PLASTIC, QFN-20
文件頁(yè)數(shù)： 10/29頁(yè)
文件大?。?/td> 1019K
代理商： TPS51511RHLT
www.ti.com
Rc v 2p
0
Vout
0.75
Co
Gm
Rs
(13)
Rc + 2.4
Vout
Co[mF]
Rs[mW]
(14)
wz2 +
1
(Co
ESR)
+ wp3 +
1
(Cc2
Rc)
(15)
Cc2 + Co
ESR
Rc
(16)
z1 +
1
2p
Cc
Rc
+
0
10
(17)
Cc +
10
2p
Rc
0
^
18
Rc[kW]
[nF]
(18)
R1 +
Vout * 0.75
0.75
R2
(19)
D-CAP Mode Operation
VoltageDivider
R1
R2
PWM
0.75V
Control
Logic
and
Driver
VOSW
VIN
DRVH
DRVL
Lx
IL
IC
VC
ESR
CO
RL
IO
SwitchingModulator
SLVS735A – FEBRUARY 2007 – REVISED APRIL 2007
APPLICATION INFORMATION (continued)
to achieve required ripple value at stable state or transient load conditions will determine the number and
size of capacitor(s) needed, and the resulting capacitance will then be enough to satisfy stable operation.
The peak-to-peak ripple value can be estimated by ESR times the inductor ripple current for stable state, or
ESR times the load-current step for a fast transient-load response.
Ceramic capacitors typically have ESR values small enough to meet the ripple requirement. On the other
hand, transient undershoot and overshoot driven by output capacitance will become the key factor to
determine the capacitance.
4. Determine f
0 and calculate Rc using Equation 13.
Note that higher Rc shows faster transient response at the cost of instability. If the transient response is
not enough even with a high Rc value, try increasing the output capacitance. Recommended f
0 is fosc/4.
Then Rc can be derived by the next simplified equation.
5. Calculate Cc2. The purpose of this capacitance is to cancel the zero caused by the output capacitor
ESR. If ceramic capacitors are used, there is no need for Cc2.
6. Calculate Cc. The purpose of Cc is to cut the DC component to obtain a high DC-feedback gain.
However, because this causes phase delay, another zero to cancel this effect at f
0 frequency is needed.
This zero,
ω
z1, is determined by Cc and Rc. Recommended ωz1 is 10 times lower than the f0 frequency.
7. Determine the value of R1 and R2. Recommended R2 value is from 10 k
to 100 k. Determine R1
A buck converter system using D-CAP mode can be simplified as shown in Figure 26.
Figure 26. Simplified D-CAP Mode Buck Converter Functional Blocks
18
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51511RHLTG4 功能描述:DC/DC 開關(guān)控制器 Synch Switcher Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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TPS51513EVM-549 功能描述:電源管理IC開發(fā)工具 TPS51513EVM-549 Eval Mod 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
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TPS51513RHB 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINGLE PHASE D-CAP+ SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED DRIVERS FOR GENERAL IC VCORE APPLICATIONS
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