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參數(shù)資料
| 型號： | LT1621IGN#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 242K |
| 代理商： | LT1621IGN#TR |
6
LT1620/LT1621
APPLICATIONS INFORMATION
WU
U
TG
COSC
LTC1435
IN–
GND
IOUT
SENSE
IN+
LT1620MS8
5
6
7
8
4
3
VBATT
16.8V
VIN
17.3V TO 28V
LT1620/21 F02
C11, 56pF
C12, 0.1
F
RUN/SS
ITH
SFB
SGND
VOSENSE
SENSE–
SENSE+
BOOST
SW
VIN
INTVCC
BG
PGND
EXTVCC
VCC
PROG
AVG
2
1
C10
100pF
C9, 100pF
R1
1k
C14
1nF
C13
0.033
F
X7R
C17, 0.01
F
R2
1.5M
C4
0.1
F
D2*
D1*
C5, 0.1
F
Si4412DY
L1
27
H
C6
0.1
F
C7
4.7
F
RSENSE
0.025
C15
0.1
F
C16
0.1
F
RP1
3k
1%
RP2
15.75k
1%
C18
0.1
F
RF2
110k
0.1%
RF1
1.44M
0.1%
C8, 100pF
C3
22
F
35V
C1
22
F
35V
C2
22
F
35V
RUN
+
* D1, D2: CENTRAL
SEMICONDUCTOR CMDSH-3
Li-ION
Figure 2. LT1620/LTC1435 Battery Charger
Charge Current Programming
Output current delivered during current mode operation is
determined through programming the voltage at the PROG
pin (VPROG). As mentioned above, optimum performance
is obtained with (VCC – VPROG) = 0.8V. The LT1620 is
biased with a precision 5V supply produced by the LTC1435,
enabling use of a simple resistor divider from VCC to
ground for a VPROG reference. Using the desired 2.5k
Thevenin impedance at the PROG pin, values of RP1 = 3k
and RP2 = 15.75k are readily calculated. The PROG pin
should be decoupled to the VCC supply.
Different values of charging current can be obtained by
changing the values of the resistors in the VPROG setting
divider to raise or lower the value of the programming
voltage, or by changing the sense resistor to an appropri-
ate value as described above.
Output Float Voltage
The 3.2A charger circuit is designed for a 4-cell Li-Ion
battery, or a battery float voltage of 16.8V. This voltage is
programmed through a resistor divider feedback to the
LTC1435 VOSENSE pin, referencing its 1.19V bandgap
voltage. Resistor values are determined through the rela-
tion: RF1 = (VBATT – 1.19)/(1.19/RF2). Setting RF2 = 110k
yields RF1 = 1.44M.
Other Decoupling Concerns
The application schematic shown in Figure 2 employs
several additional decoupling capacitors. Due to the inher-
ently noisy environment created in switching applications,
decoupling of sensitive nodes is prudent. As noted in the
schematic, decoupling capacitors are included on the
current programming pin (PROG) to the VCC rail and
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