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參數(shù)資料
| 型號： | LTC4110EUHF#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38 |
| 封裝： | 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 29/52頁 |
| 文件大?。?/td> | 450K |
| 代理商： | LTC4110EUHF#TR |
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LTC4110
35
4110fb
APPLICATIONS INFORMATION
the highest current ow between charge and calibration
modes, whichever is greater.
R
mV
I
SNS BAT
MAX
() =
100
See Table 10 for example values.
RSNS(BAT)accuracyisintentionallymadeveryhightopermit
development of an accurate host software based capacity
measurements of standard batteries. Use resistors with
1% accuracy or better or use a 4-terminal Kelvin sensing
resistor. See the PCB Layout section for a reasonable no
cost Kelvin sensing layout that permits the use of less
expensive standard two terminal sense resistors. For more
electrical information relating to RSNS(BAT) itself, see the
Component Selection section.
As designed, any signicant AC ripple voltage seen by
CSP and CSN pins can lead to current sensing errors for
both current programming and capacity measurements.
To prevent the Flyback’s AC ripple voltage from interfering
with DC accuracy, RSNS(BAT) must have a RC lter network
installed between the RSNS(BAT) and CSP and CSN pins.
The CSP and CSN pins have an input bias current of ±10nA
typically. A very large RCSP1 + RCSP2 value will cause a
large current mismatch error. The current owing into
the CSP and CSN pins equals VSNS/(RCSP1 + RCSP2) =
100mV/(RCSP1 + RCSP2), a very small RCSP1 + RCSP2 value
will result in a large current. Typically a value between 3k
and 30k gives the best performance.
Figure 12. CSP, CSN RC Filter
CCSP
330n
CCSN
330n
RSNS(BAT)
100mV
RCSP2
2k
RCSN2
2k
RCSP1
1k
RCSN1
1k
4110 F12
–
+
LTC4110
CA
Recommended starting values for the lter is:
RCSP1 = RCSN1 between 1K and 2K
RCSP1 + RCSP2 = RCSN1 + RCSN2 = about 3K
CCSP = CCSN = about 3 CITH.
Figure 12 shows typical values for CITH = 0.1μF
RSNS(FET)
The LTC4110’s Flyback converter operates in current mode
with RSNS(FET) monitoring cycle-by-cycle transformer cur-
rent in both Charge and Calibration modes. The LTC4110’s
ISENSE pin serves two functions. First is to regulate the
primary current as required by the feedback loop. Second
is to monitor the secondary current and check for short
circuits. The traditional Flyback primary and secondary
currents look like the following:
Figure 13. Flyback Primary and Secondary Current
ΔI
IPRI
SECONDARY CURRENT
PRIMARY CURRENT
IPRI
N
0
4110 F13
The waveforms in Figure 13 each assume a view of posi-
tive current ow into the load. The value N represents the
ratio of the secondary to the primary with the primary
set to a value of 1. Unlike a traditional Flyback topology,
the LTC4110 Flyback is bi-directional, so the meaning of
“primary” is a function of the operating mode. In order
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