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參數(shù)資料
| 型號： | LM3647IMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | PLASTIC, SOIC-20 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大小： | 271K |
| 代理商： | LM3647IMX |
4.0 Functional Description (Continued)
10131815
The charge current duty cycles for the different phases
cycles are listed below:
Charge Phase
Charge Current Duty
Cycle
Soft Start
10%
Fast Charge
100%
Topping Charge
10%
Maintenance Charge
5%
4.3.4 Dimensioning the Reset Circuitry
The reset-circuitry is designed to hold the RESET pin low
until the power supply to the LM3647 has stabilized. The
RC-network (R21 and C4) should be dimensioned in the
following way:
(R21 x C4) > 5xPowerSupplyRiseTime
The diode D2 discharges the capacitance C4 when power
loss occurs. The resistor R20 is used to protect the SYSOK-
pin, and its value is not critical (typical value is 2 k
). R20
can be eliminated if the SYSOK pin is not connected to
RESET or if the value of C4 is
≤0.1 F. The connection
between RESET and SYSOK is optional but highly recom-
mended for safe operation of the LM3647.
10131816
4.3.5 Dimensioning the RCIN Circuitry
The RC-circuitry is designed to time the charger so it
charges and regulates at the correct frequency. The values
of the R and C are important, because a change in the
RC-value gives a higher or lower operating frequency which
affects charge quality. The capacitance should be a ceramic
type and preferably an NP0 type, which gives the least
frequency deviation with temperature change.
10131817
4.3.6 Dimensioning the DISCHARGE Circuitry
The discharge-circuitry controls the discharge rate during the
discharge phase (if used). The discharge output turns on the
transistor Q2, and a current flows from the battery through
the discharge resistor R8. The current through R8 depends
on battery voltage and the value of R8. This value depends
on the maximum discharge rate for the battery pack. The
approximate value can be calculated using the formula be-
low:
The resistor R7 keeps the transistor Q2 off until the LM3647
has been powered up and is in control of the circuitry.
10131819
LM3647
www.national.com
9
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