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參數(shù)資料
| 型號(hào)： | TS1051 |
| 廠商： | Taiwan Semiconductor Co., Ltd. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors |
| 中文描述： | 恒壓恒為電池充電器和適配器電流控制器 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 439K |
| 代理商： | TS1051 |
TS1051
Constant Voltage and Constant Current Controller
For Battery Chargers and Adaptors
Principle of Operation and Application Hints (continues)
4/9
Version: B07
Current Control
The current loop is controlled via the second trans-conductance operational amplifier, the sense resistor Rsense, and
the optocoupler. The control verifies as following
* Rsense x llim = Vsense
* Rsense = Vsense / llim
Ilim is the desired limited current, Vsense is the threshold voltage for the current control loop.
As an example, with llim = 1A, Vsense = -200mV, then Rsense = 200m
Ω
.
Note that the Rsense resistor should be chosen taking into account the maximum dissipation (Plim) through it during
full load operation.
* Plim = Vsense x llim
As an example, with llim=1A, and Vsense=200mV, Plim=200mW.
Therefore, for most adapter and battery charger applications, a quarter-watt, or half-watt resistor to make the current
sensing function is sufficient.
Vsense threshold is achieved internally by a resistor bridge tied to the Vref voltage reference. Its middle point is tied to
the positive input of the current control operational amplifier, and its foot is to be connected to lower potential point of
the senseresistor as shown on the following figure. The resistors of this bridge are matched to provide the best
precision possible. The current siking outpits of the two trans-conductance operational amplifiers are common (to the
outpit of the IC). This makes an Oring function which ensures that whenever the current or the voltage reaches too
high values, the optocoupler is activated.
The relation between the controlled current and the controlled output voltage can be described with a square
characteristic as shown in the following V/I output-power graph
Output Voltage vs. Output Current
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