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參數(shù)資料
| 型號： | LTC3831IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 208K |
| 代理商： | LTC3831IGN |
LTC3831
16
3831fb
APPLICATIONS INFORMATION
not for capacitance value. A capacitor with suitable ESR
will usually have a larger capacitance value than is needed
to control steady-state output ripple.
Electrolytic capacitors, such as the Sanyo MV-WX series,
rated for use in switching power supplies with specied
ripple current ratings and ESR, can be used effectively
in LTC3831 applications. OS-CON electrolytic capaci-
tors from Sanyo and other manufacturers give excellent
performance and have a very high performance/size ratio
for electrolytic capacitors. Surface mount applications
can use either electrolytic or dry tantalum capacitors.
Tantalum capacitors must be surge tested and specied
for use in switching power supplies. Low cost, generic
tantalums are known to have very short lives followed by
explosive deaths in switching power supply applications.
Other capacitor series that can be used include Sanyo
POSCAPs and the Panasonic SP line.
A common way to lower ESR and raise ripple current ca-
pability is to parallel several capacitors. A typical LTC3831
application might exhibit 5A input ripple current. Sanyo
OS-CON capacitors, part number 10SA220M (220μF/10V),
feature 2.3A allowable ripple current at 85°C; three in
parallel at the input (to withstand the input ripple current)
meet the above requirements. Similarly, Sanyo POSCAP
4TPB470M (470μF/4V) capacitors have a maximum rated
ESR of 0.04Ω, three in parallel lower the net output capaci-
tor ESR to 0.013Ω.
Feedback Loop Compensation
The LTC3831 voltage feedback loop is compensated at the
COMP pin, which is the output node of the error amplier.
The feedback loop is generally compensated with an RC +
C network from COMP to GND as shown in Figure 9a.
Loop stability is affected by the values of the inductor,
the output capacitor, the output capacitor ESR, the error
amplier transconductance and the error amplier com-
pensation network. The inductor and the output capacitor
create a double pole at the frequency:
fLC = 1/ 2π (LO)(COUT)
The ESR of the output capacitor and the output capacitor
value form a zero at the frequency:
fESR = 1/ 2π(ESR)(COUT)
The compensation network used with the error amplier
must provide enough phase margin at the 0dB crossover
frequency for the overall open-loop transfer function. The
zero and pole from the compensation network are:
fZ = 1/[2π(RC)(CC)] and
fP = 1/[2π(RC)(C1)] respectively.
Figure 9b shows the Bode plot of the overall transfer
function.
Although a mathematical approach to frequency compensa-
tion can be used, the added complication of input and/or
output lters, unknown capacitor ESR, and gross operating
Figure 9a. Compensation Pin Hook-Up
Figure 9b. Bode Plot of the LTC3831 Overall Transfer Function
3831 F09a
LTC3831
VREF
–
+
VFB
VTT
6
COMP
10
C1
CC
RC
ERR
LOOP
GAIN
3830 F10b
fZ
fLC
fESR
fCO
fP
FREQUENCY
20dB/DECADE
fSW = LTC3831 SWITCHING
FREQUENCY
fCO = CLOSED-LOOP CROSSOVER
FREQUENCY
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| LTC3831IGN#PBF | 功能描述:IC SW REG CONTROLLR SYNC 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
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