參數(shù)資料
型號： LTC4008EGN#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C
中文描述： BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-20
文件頁數(shù)： 10/24頁
文件大小： 221K
代理商： LTC4008EGN#TRPBF
LTC4008
18
4008fb
APPLICATIONS INFORMATION
If you are using a thermistor that doesn’t have a 1:7
HIGH/LOW ratio, or you wish to set the HIGH/LOW limits
to different temperatures, then the more generic network
in Figure 9 should work.
Once the thermistor, RTH, has been selected and the
thermistor value is known at the temperature limits, then
resistors R9 and R9A are given by:
For NTC thermistors:
R9 = 6 RTH(LOW) RTH(HIGH)/(RTH(LOW) – RTH(HIGH))
R9A = 6 RTH(LOW) RTH(HIGH)/(RTH(LOW) – 7 RTH(HIGH))
Where RTH(LOW) > 7 RTH(HIGH)
For PTC thermistors:
R9 = 6 RTH(LOW) RTH(HIGH)/(RTH(HIGH) – RTH(LOW))
R9A = 6 RTH(LOW) RTH(HIGH)/(RTH(HIGH) – 7 RTH(LOW))
Where RTH(HIGH) > 7 RTH(LOW)
Example #1: 10kΩ NTC with custom limits
TLOW = 0°C, THIGH = 50°C
RTH = 10k at 25°C,
RTH(LOW) = 32.582k at 0°C
RTH(HIGH) = 3.635k at 50°C
R9 = 24.55k
→ 24.3k (nearest 1% value)
R9A = 99.6k
→ 100k (nearest 1% value)
Figure 9. General Thermistor Network
LTC4008
NTC
R9
C7
R9A
RTH
4008 F09
8
Example #2: 100kΩ NTC
TLOW = 5°C, THIGH = 50°C
RTH = 100k at 25°C,
RTH(LOW) = 272.05k at 5°C
RTH(HIGH) = 33.195k at 50°C
R9 = 226.9k
→ 226k (nearest 1% value)
R9A = 1.365M
→ 1.37M (nearest 1% value)
Example #3: 22kΩ PTC
TLOW = 0°C, THIGH = 50°C
RTH = 22k at 25°C,
RTH(LOW) = 6.53k at 0°C
RTH(HIGH) = 61.4k at 50°C
R9 = 43.9k
→ 44.2k (nearest 1% value)
R9A = 154k
Sizing the Thermistor Hold Capacitor
During the hold interval, C7 must hold the voltage across
the thermistor relatively constant to avoid false readings.
A reasonable amount of ripple on NTC during the hold
interval is about 10mV to 15mV. Therefore, the value of
C7 is given by:
C7 = tHOLD/(R9/7 –ln(1 – 8 15mV/4.5V))
= 10 RRT 17.5pF/(R9/7 –ln(1 – 8 15mV/4.5V)
Example:
R9 = 24.3k
RRT = 150k
C7 = 0.28μF
→ 0.27μF (nearest value)
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相關(guān)代理商/技術(shù)參數(shù)
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LTC4009 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage High Current Controller for Battery Charging and Power Management
LTC4009-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger
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LTC4009CUF#PBF 功能描述:IC CHARGER BATTERY MC 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC4009CUF#TRPBF 功能描述:IC CHARGER BATTERY MC 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件
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