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參數(shù)資料
| 型號(hào)： | LT1621IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Rail-to-Rail Current Sense Amplifier |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 282K |
| 代理商： | LT1621IGN |
6
LT1620/LT1621
APPLICATIO
S I
FOR
ATIO
U
W
U
U
TG
C
OSC
LTC1435
IN
–
GND
I
OUT
SENSE
IN
+
LT1620MS8
5
6
7
8
4
3
V
16.8V
V
17.3V TO 28V
LT1620/21 F02
C11, 56pF
C12, 0.1
μ
F
RUN/SS
I
TH
SFB
SGND
V
OSENSE
SENSE
–
SENSE
+
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
V
CC
PROG
AVG
2
1
C10
100pF
C9, 100pF
R1
1k
C14
1nF
C13
0.033
μ
F
X7R
C17, 0.01
μ
F
R2
1.5M
C4
0.1
μ
F
D2*
D1*
C5, 0.1
μ
F
Si4412DY
Si4412DY
L1
27
μ
H
C6
0.1
μ
F
C7
4.7
μ
F
R
0.025
C15
0.1
μ
F
C16
0.1
μ
F
R
P1
3k
1%
R
15.75k
1%
C18
0.1
μ
F
R
110k
0.1%
R
1.44M
0.1%
C8, 100pF
C3
22
μ
F
35V
C1
22
μ
F
35V
C2
22
μ
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 (V
PROG
). As mentioned above, optimum performance
is obtained with (V
CC
– V
PROG
) = 0.8V. The LT1620 is
biased with a precision 5V supply produced by the LTC1435,
enabling use of a simple resistor divider from V
CC
to
ground for a V
PROG
reference. Using the desired 2.5k
Thevenin impedance at the PROG pin, values of R
P1
= 3k
and R
P2
= 15.75k are readily calculated. The PROG pin
should be decoupled to the V
CC
supply.
Different values of charging current can be obtained by
changing the values of the resistors in the V
PROG
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 V
OSENSE
pin, referencing its 1.19V bandgap
voltage. Resistor values are determined through the rela-
tion: R
F1
= (V
BATT
– 1.19)/(1.19/R
F2
). Setting R
F2
= 110k
yields R
F1
= 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 V
CC
rail and
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相關(guān)代理商/技術(shù)參數(shù) |
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| LT1621IGN#PBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| LT1621IGN#TR | 功能描述:IC AMP CURR SENSE RR DUAL 16SSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| LT1621IGN#TRPBF | 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| LT1624IS8 | 制造商:Linear Technology 功能描述: |
| LT-1625S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:T1/CEPT/ISDN-PRI TRANSFORMER |
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