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参数资料
| 型号： | TSM1051CD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | LEAD FREE, SOP-8 |
| 文件页数： | 14/15页 |
| 文件大小： | 318K |
| 代理商： | TSM1051CD |
Application information
TSM1051
8/15
5
Application information
5.1
Voltage and current control
5.1.1
Voltage control
The voltage loop is controlled via a first transconductance operational amplifier, the voltage
divider R1, R2, and the optocoupler which is directly connected to the output. Its possible to
choose the values of R1 and R2 resistors using Equation 1.
where Vout is the desired output voltage.
To avoid the discharge of the load, the voltage divider R1, R2 should be highly resistive. For
this type of application, it is suggested a total value of 100 k
(or more) for resistors R1 and
R2
As an example, with R2 = 33 k, VOUT = 5 V, VREF = 1.210 V, then R1 = 103.4 k
Please note that if a low drop diode is inserted between the load and the voltage divider of
the voltage control loop in order to avoid current flowing from the load through the voltage
divider, the diode voltage drop should be taken into account in the computation of Equation
1 replacing Vout with Vout + Vdrop.
5.1.2
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:
Rsense x Ilim = Vsense
Eq:2
Rsense = Vsense / Ilim
Eq:2a
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 that the Rsense resistor should be chosen taking into account the maximum
dissipation (Plim) through it during full load operation.
Plim = Vsense x Ilim.
Eq:3
As an example, with Ilim = 1 A, and Vsense = 200 mV, Plim = 200 mW.
Therefore, for most adaptor 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 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 3. The resistors of this voltage
divider are matched to provide the best precision possible. The current sinking outputs of
the two trans-conductance 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. (with power supply of the device indipendent from the
output voltage)
R
1
R
2
V
OUT
V
REF
–
()
V
REF
---------------------------------------
=
Eq:1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSM1051CDT | 功能描述:电池管理 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TSM1051CLT | 功能描述:电池管理 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TSM1051D | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS |
| TSM1051L | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS |
| TSM1052 | 功能描述:电压模式 PWM 控制器 Constant Vltg Current Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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