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參數(shù)資料
| 型號(hào)： | LTC4007EUFD-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4A, High Efficiency, Standalone Li-Ion Battery Charger; Package: QFN; No of Pins: 24; Temperature Range: -40°C to +125°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 269K |
| 代理商： | LTC4007EUFD-1#PBF |
19
LTC4007-1
40071f
APPLICATIO S I FOR ATIO
WU
UU
Example #2: 100k
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: 22k
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 = 309k (~2 hour timer)
C7 = 0.57
F → 0.56F (nearest value)
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 10 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: 10k
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 10. General Thermistor Network
LTC4007-1
NTC
R9
7
C7
R9A
RTH
40071 F10
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PDF描述 |
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| LTC4007EUFD-1#TRPBF | 4A, High Efficiency, Standalone Li-Ion Battery Charger; Package: QFN; No of Pins: 24; Temperature Range: -40°C to +125°C |
| LTC4008EGN#PBF | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
| LTC4008EGN#TRPBF | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
| LTC4008EGN-1#PBF | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
| LTC4008EGN-1#TRPBF | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LTC4008 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger |
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