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| 型号： | LTC4007EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 24SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4007
APPLICATIONS INFORMATION
LTC4007
NTC 9
R9
Example #2: 100kΩ NTC
TLOW = 5°C, THIGH = 50°C
C7
R9A
R TH
R TH = 100k at 25°C,
4007 F10
Figure 10. General Thermistor Network
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, R TH , 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 R TH(LOW) ? R TH(HIGH) /(R TH(LOW) – R TH(HIGH) )
R9A = 6 R TH(LOW) ? R TH(HIGH) /(R TH(LOW) – 7 ? R TH(HIGH) )
Where R TH(LOW) > 7 ? R TH(HIGH)
For PTC thermistors:
R9 = 6 R TH(LOW) ? R TH(HIGH) /(R TH(HIGH) – R TH(LOW) )
R9A = 6 R TH(LOW) ? R TH(HIGH) /(R TH(HIGH) – 7 ? R TH(LOW) )
Where R TH(HIGH) > 7 ? R TH(LOW)
Example #1: 10kΩ NTC with custom limits
TLOW = 0°C, THIGH = 50°C
R TH = 10k at 25°C,
R TH(LOW) = 32.582k at 0°C
R TH(LOW) = 272.05k at 5°C
R TH(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
R TH = 22k at 25°C,
R TH(LOW) = 6.53k at 0°C
R TH(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 = t HOLD /(R9/7 ? –ln(1 – 8 ? 15mV/4.5V))
= 10 ? R RT ? 17.5pF/(R9/7 ? –ln(1 – 8 ? 15mV/4.5V)
Example:
R9 = 24.3k
R RT = 309k (~2 hour timer)
C7 = 0.57μF → 0.56μF (nearest value)
R TH(HIGH) = 3.635k at 50°C
R9 = 24.55k → 24.3k (nearest 1% value)
R9A = 99.6k → 100k (nearest 1% value)
4007fc
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