APPLICATIONS INFOR" />
參數(shù)資料
型號(hào): LT1620CS8#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 10/12頁(yè)
文件大小: 0K
描述: IC AMP R-R CURRENT SENSE 8-SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類(lèi)型: 電流檢測(cè)
電路數(shù): 1
輸出類(lèi)型: 滿(mǎn)擺幅
電流 - 輸入偏壓: 20nA
電壓 - 輸入偏移: 6000µV
電流 - 電源: 2.3mA
電壓 - 電源,單路/雙路(±): 4.5 V ~ 5.5 V
工作溫度: 0°C ~ 70°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 帶卷 (TR)
7
LT1620/LT1621
APPLICATIONS INFORMATION
WU
U
between the IN+ and INinputs. Effective decoupling of
supply rails is also imperative in these types of circuits, as
large current transients are the norm. Power supply
decoupling should be placed as close as possible to the
ICs, and each IC should have a dedicated capacitor.
Design Equations
Sense resistor: RSENSE = VID/IMAX
Current limit programming voltage:
VPROG = VCC –[(10)(VID)]
Voltage feedback resistors:
RF1/RF2 = (VBATT(FLOAT) – 1.19)/1.19
End-of-Cycle Flag Application
Figure 3 illustrates additional connections using the
LT1620GN, including the end-of-cycle (EOC) flag feature.
The EOC threshold is used to notify the user when the
required load current has fallen to a programmed value,
usually a given percentage of maximum load.
The end-of-cycle output (MODE) is an open-collector pull-
down; the circuit in Figure 3 uses a 10k pull-up resistor on
the MODE pin, connected to VCC.
The EOC flag threshold is determined through program-
ming VPROG2. The magnitude of this threshold corre-
sponds to 20 times the voltage across the sense amplifier
inputs.
As mentioned in the previous circuit discussion, the
charging current level is set to correspond to a sense
voltage of 80mV. The circuit in Figure 3 uses a resistor
divider to create a programming voltage (VCC –VPROG2)of
0.5V. The MODE flag will therefore trip when the charging
current sense voltage has fallen to 0.5V/20 or 0.025V.
Thus, the end-of-cycle flag will trip when the charging
current has been reduced to about 30% of the maximum
value.
Input Current Sensing Application
Monitoring the load placed on the VIN supply of a charging
system is achieved by placing a second current sense
resistor in front of the charger VIN input. This function is
useful for systems that will overstress the input supply
(wall adapter, etc.) if both battery charging and other
system functions simultaneously require high currents.
This allows use of input supply systems that are capable
of driving full-load battery charging and full-load system
requirements, but not simultaneously. If the input supply
current exceeds a predetermined value due to a combina-
tion of high battery charge current and external system
demand, the input current sense function automatically
Figure 3. End-of-Cycle Flag Implementation with LT1620GN
Figure 4. Input Current Sensing Application
AVG
PROG
PROG2
AVG2
VCC
IN+
SENSE
IOUT
VEE
MODE
IN
LT1620GN
LT1620/21 F03
CONNECTED AS IN FIGURE 2
R1
5.5k
R2
50k
C2
3.3
F
C1, 3.3
F
R3
10k
END-OF-CYCLE
(ACTIVE LOW)
+
AVG
PROG
VCC
IN+
SENSE
LT1620MS8
1
2
3
4
8
7
IOUT
GND
IN
6
5
VSW
7
VIN
5
81
VFB
6
S/S
2
IFB
4
GND
TAB
3
C1
1
F
22
F
RP1
3k
1%
RP2
12k
1%
C2
1
F
R1
0.033
L1B
10
H
22
F
TO
SYSTEM LOAD
4.7
F
L1A
10
H
24
VC
0.22
F
0.1
F
X7R
LT1513
RUN
5V
57k
6.4k
22
F
× 2
MBRS340
VBATT = 12.3V
1620/21 F04
RSENSE
0.1
+
Li-ION
相關(guān)PDF資料
PDF描述
LT1620CS8#TR IC AMP CURRENT SENSE R-R 8SOIC
0713085456 CONN HEADER BKWY SMD TIN 56POS
3403.0021.24 FUSE 3.15A 250V SMD FAST
SSQ-150-01-G-S CONN RCPT .100" 50POS SNGL GOLD
3403.0020.24 FUSE 2.5A 250V SMD FAST
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1620IGN 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源,單路/雙路(±):3 V ~ 16 V,±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC(0.154",3.90mm 寬) 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱(chēng):296-1834296-1834-5
LT1620IGN#PBF 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源,單路/雙路(±):3 V ~ 16 V,±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC(0.154",3.90mm 寬) 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱(chēng):296-1834296-1834-5
LT1620IGN#TR 功能描述:IC AMP CURRENT SENSE R-R 16SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源,單路/雙路(±):3 V ~ 16 V,±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC(0.154",3.90mm 寬) 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱(chēng):296-1834296-1834-5
LT1620IGN#TRPBF 功能描述:IC AMP R-R CURRENT SENSE 16-SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源,單路/雙路(±):3 V ~ 16 V,±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC(0.154",3.90mm 寬) 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱(chēng):296-1834296-1834-5
LT1620IS8 功能描述:IC AMP R-R CURRENT SENSE 8-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:通用 電路數(shù):2 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源,單路/雙路(±):1.8 V ~ 5.25 V,±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬) 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件