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參數(shù)資料
| 型號： | TSM1052 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | LEAD FREE, SOT-23, 6 PIN |
| 文件頁數(shù)： | 15/15頁 |
| 文件大?。?/td> | 262K |
| 代理商： | TSM1052 |
TSM1052
Application information
9/15
4.2.2
Current control
The current loop is controlled via the second trans-conductance operational amplifier, the
sense resistor Rsense, and the optocoupler. The control equation verifies:
Equation 2
where Ilim is the desired limited current, and VSENSE is the threshold voltage for the current
control loop.
As an example, with Ilim = 1 A, VSENSE = 200 mV, then RSENSE = 200 m.
Note:
The Rsense resistor should be chosen taking into account the maximum dissipation (Plim)
through it during full load operation.
Equation 3
As an example, with Ilim = 1 A, and Vsense = 200 mV, Plim = 200 mW.
Therefore, for most adapter and battery charger applications, a quarter-watt, or half-watt
resistor is sufficient. VSENSE threshold is made internally by a voltage divider 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 sense
resistor as shown in Figure 15 on page 8. The resistors of this voltage divider are matched
to provide the best possible accuracy. The current sinking outputs of the two
transconductance operational amplifiers are common (to the output of the IC). This makes
an ORing function which ensures either the voltage control or the current control, driving the
optocoupler's photodiode to transmit the feedback to the primary side.
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 diagram.
(with the power supply of the device indipendent of the output voltage)
a)
b)
lim
sense
I
V
R
=
sense
lim
sense
V
I
R
=
lim
sense
lim
I
V
P
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSM1052_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Constant voltage and constant current controller for battery chargers and adapters |
| TSM105CD | 功能描述:電池管理 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TSM105CDT | 功能描述:電池管理 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TSM105CLT | 功能描述:電池管理 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TSM105D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS |
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