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参数资料
| 型号： | TSM1015AIDT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | PLASTIC, SO-8 |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 代理商： | TSM1015AIDT |
Principles of Operation and Application Tips
TSM1015
5/10
3 Principles of Operation and Application Tips
3.1 Voltage control
The voltage loop is controlled via a first transconductance operational amplifier, the resistor bridge R1,
R2, and the optocoupler which is directly connected to the output.
The relation between the values of R1 and R2 should be chosen as written in Equation 1.
R1 = R2 x VRef / (Vout - VRef)
Equation 1
Where Vout is the desired output voltage.
To avoid the discharge of the load, the resistor bridge R1, R2 should be highly resistive. For this type of
application, a total value of 100K
(or more) would be appropriate for the resistors R1 and R2.
As an example, with R2 = 100K
, Vout = 4.10V, Vref = 1.25V, then R1 = 41.9K.
Note that if the low drop diode should be inserted between the load and the voltage regulation resistor
bridge to avoid current flowing from the load through the resistor bridge, this drop should be taken into
account in the above calculations by replacing Vout by (Vout + Vdrop).
3.2 Current control
The current loop is controlled via the second trans-conductance operational amplifier, the sense resistor
Rsense, and the optocoupler.
Vsense threshold is achieved externally 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 sense resistor as shown on the following figure. The resistors of this bridge
are matched to provide the best precision possible.
The control equation verifies:
Rsense x llim = Vsense
Equation 2
Vsense = R5*Vref/(R4+R5)
llim = R5*Vref/(R4+R5)*Rsense
Equation 2’
where Ilim is the desired limited current, and Vsense is the threshold voltage for the current control loop.
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
Equation 3
Therefore, for most adapter and battery charger applications, a quarter-watt, or half-watt resistor to make
the current sensing function is sufficient.
The current sinking outputs of the two trans-connuctance operational amplifiers are common (to the
output 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.
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相关代理商/技术参数 |
参数描述 |
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| TSM101A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:VOLTAGE AND CURRENT CONTROLLER |
| TSM101AC | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:VOLTAGE AND CURRENT CONTROLLER |
| TSM101ACD | 功能描述:开关变换器、稳压器与控制器 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TSM101ACDT | 功能描述:DC/DC 开关控制器 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TSM101ACN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Control/Management |
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