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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)： | 33/52頁 |
| 文件大?。?/td> | 450K |
| 代理商： | LTC4110EUHF#TR |
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LTC4110
39
4110fb
R1 = resistor connected between DCDIV and GND
R2 = resistor connected between supply input and
DCDIV
VBGR = reference voltage 1.220V
For example, if supply input = 12V and backup starts when
it drops to 11V, then VBACKUP = 11V, VBACKDRIVE = 13.5V,
R2/R1 = 8.02, choose R1 = 10k, then R2 = 80.6k.
If a higher ratio than VOVP/VBGR = 1.23 is desired between
VBACKDRIVE and VBACKUP, a third resistor can be used as
shown in Figure 17.
For example, if supply input = 12V and backup starts when
it drops to 8V, calibration terminates when it rises to 16V,
and VDC = VDD = 4.75V, then R2/R1 = 21.87, R3/R1 = 3.88,
choose R1 = 10k then R2 = 221k and R3 = 39.2k.
If the noise on supply input is a problem, a capacitor can
be connected between DCDIV and GND.
PROGRAMMING CALIBRATION/BACKUP CUT-OFF
THRESHOLD
The pins VCAL and VDIS are used to calculate custom
discharge cut-off voltages for their respective operating
modes. The equations shown below are generic for both.
There is no implied relationship between VCAL and VDIS
for they are independent of each other.
The equations are most helpful if you pick the VCUTOFF
voltage you want, within the range limits offered, and then
solve for VCAL or VDIS. With the voltage value of VCAL or
VDIS calculated, determine the necessary voltage divider
network from VREF required to get the calculated voltage
on these pins respectively. It is recommended that one
single series resistor divider network from VREF to ground
be used to obtain all of the pin voltages you need. It should
be noted that custom values of VCHG would also affect the
divider network complexity. See Programming Charge
Voltage section for more information.
Connect the VCAL or VDIS pin to GND will set the default
calibration/backup cut-off threshold (2.75V for Li-Ion,
1.93V for SLA, 0.95V for NiMH/NiCd). These threshold
voltages can be adjusted (±400mV for Li-Ion, ±300mV
for SLA, ±200mV for NiMH/NiCd) by tying the pin to ap-
propriate voltage on the VREF pin resistor divider according
to the following equations:
V
VV
V
Li Ion
V
CUTOFF
CAL
DIS
BGR
CUTOFF
C
=
=
/
.
(
)
42
A
AL
DIS
BGR
CUTOFF
CAL
DIS
BGR
V
SLA
V
VV
V
/
.
(
)
/
235
=
(
/
)
2
NiMH NiCD
APPLICATIONS INFORMATION
Figure 17. Backup and Boost Detect Comparators
R
VV
V
BACKDRIVE
BACKUP
BGR
BACKDRIVE
2
10 23
=
–
.
–
–.
.
123
023
1
3
1
V
R
V
BACKUP
DC
BGR
BACKD
=
R
RIVE
BACKUP
BACKDRIVE
BACKUP
V
VV
V
–
–.
.
123
023
D
DC
BACKDRIVE
BACKUP
VV
–.
123
1
where:
VDC = Any regulated DC voltage available in the system
such as SMBus pull up, LED supply or LTC4110’s VDD
voltage, must be higher than 1.7V. R3 = resistor connected
between VDC and DCDIV.
4110 F17
DCDIV
BACKUP
SUPPLY
INPUT
–
+
VBGR
VDC
R2
R1
R3
OPTIONAL RESISTOR
TO INCREASE THE
1.23 TO 1 RATIO
CMP
BOOST
1.23 VBGR
+
–
CMP
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