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參數(shù)資料
| 型號： | LTC4000EUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 24/40頁 |
| 文件大小： | 428K |
| 代理商： | LTC4000EUFD#TRPBF |
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LTC4000
30
4000f
applicaTions inForMaTion
This same procedure is then repeated for the other four
loops: the input current regulation, the output voltage
regulation, the battery float voltage regulation and finally
the charge current regulation when VOFB > VOUT(INST_ON).
Notethattheresultingoptimumvaluesforeachoftheloops
may differ slightly. The final values of CC and RC are then
selected by combining the results and ensuring the most
conservativeresponseforalltheloops.Thisusuallyentails
picking the largest value of CC and the smallest value of
RC based on the results obtained for all the loops. In this
particular example, the value of CC is finally set to 47nF
and RC = 14.7kΩ.
BOARD LAYOUT CONSIDERATIONS
In the majority of applications, the most important param-
eter of the system is the battery float voltage. Therefore,
theuserneedstobeextracarefulwhenplacingandrouting
the feedback resistor RBFB1 and RBFB2. In particular, the
batterysenselineconnectedtoRBFB1andthegroundreturn
line for the LTC4000 must be Kelvined back to where the
battery output and the battery ground are located respec-
tively. Figure 19 shows this Kelvin sense configuration.
For accurate current sensing, the sense lines from RIS
and RCS (Figure 19) must be Kelvined back all the way
to the sense resistors terminals. The two sense lines of
each resistor must also be routed close together and away
from noise sources to minimize error. Furthermore, cur-
rent filtering capacitors should be placed strategically to
ensure that very little AC current is flowing through these
sense resistors as mentioned in the applications section.
The decoupling capacitors CIN and CBIAS must be placed
as close to the LTC4000 as possible. This allows as short
a route as possible from CIN to the IN and GND pins, as
well as from CBIAS to the BIAS and GND pins.
In a typical application, the LTC4000 is paired with an
external DC/DC converter. The operation of this converter
often involves high dV/dt switching voltage as well as high
currents. Isolate these switching voltages and currents
from the LTC4000 section of the board as much as pos-
sible by using good board layout practices. These include
separating noisy power and signal grounds, having a good
low impedance ground plane, shielding whenever neces-
sary, and routing sensitive signals as short as possible
and away from noisy sections of the board.
Figure 19. Kelvin Sense Lines Configuration for LTC4000
4000 F19
VIN
CSN
CLN
IN
CSP
BAT
GND
LTC4000
RC
ITH
GND
SWITCHING
CONVERTER
BGATE
ITH
IID
CC
CC
IGATE
RBFB1
RIS
RCS
RBFB2
BFB
FBG
SYSTEM LOAD
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