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參數(shù)資料
| 型號(hào)： | TPS65560RGTTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.78 A BATTERY CHARGE CONTROLLER, PQCC16 |
| 封裝： | GREEN, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 1108K |
| 代理商： | TPS65560RGTTG4 |
www.ti.com
t
OFF
TURN
= N
x L
I
PEAK
V
OUT
(2)
Programming Peak Current
Voltage of I_PEAK - V
IPEAK1
IPEAK2
Peak
of
I
SW
SLVS608 – JANUARY 2006
The OFF time is dependant on output voltage. As the output voltage gets higher, the OFF time gets shorter (see
The TPS65560 provides a method to program the peak primary current with a voltage applied to the I_PEAK pin.
The I_PEAK input is treated as a logic input below V(PKL) (0.6 V) and above V(PKH) (2.4 V). Between V(PKL) and
V(PKH), I_PEAK input is treated as an analog input. Using this characteristic, I(PEAK) can be set by a logic signal or
by an analog input.
Typical usages of this function are:
1. Setting the peak charging currents based on the battery voltage. Larger I(PEAK) for a fully charged battery and
lower I(PEAK) for a discharged battery.
2. Reducing I(PEAK) when powering a zooming lens motor. This avoids inadvertent shutdowns due to large
current from the battery.
In Figure 1, three optional connections to I_PEAK are shown.
1. Use the controller to treat I_PEAK as the logic input pin. This option is the easiest.
2. Use a D/A converter to force I(PEAK) to follow analog information, such as battery voltage.
3. Use an analog circuit to achieve the same results as the D/A converter.
Figure 7. I_PEAK vs I(SW)
8
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