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参数资料
| 型号： | TSM1012IDT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | MINISO-8 |
| 文件页数： | 5/8页 |
| 文件大小： | 119K |
| 代理商： | TSM1012IDT |
5/8
1. Voltage and Current Control
1.1. Voltage Control
The voltage loop is controlled via a first transcon-
ductance operational amplifier, the resistor bridge
R1, R2, and the optocoupler which is directly con-
nected 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)
Eq1
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 = 1.210V, then R1 = 41.9K
.
Note that if the low drop diode should be inserted
between the load and the voltage regulation resis-
tor bridge to avoid current flowing from the load
through the resistor bridge, this drop should be
taken into account in the above calculations by re-
placing Vout by (Vout + Vdrop).
1.2. 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 re-
sistor bridge tied to the Vref voltage reference. Its
middle point is tied to the positive input of the cur-
rent 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 re-
sistors of this bridge are matched to provide the
best precision possible
The control equation verifies:
Rsense x Ilim = Vsense
eq2
Vsense = R5*Vref/(R4+R5)
Ilim = R5*Vref/(R4+R5)*Rsense
eq2'
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 Ilim.
eq3
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-con-
nuctance operational amplifiers are common (to
the output of the IC). This makes an ORing func-
tion which ensures that whenever the current or
the voltage reaches too high values, the optocou-
pler is activated.
The relation between the controlled current and
the controlled output voltage can be described
with a square characteristic as shown in the fol-
lowing V/I output-power graph.
Figure 3 : Output voltage versus output current
2. Compensation
The voltage-control trans-conductance operation-
al amplifier can be fully compensated. Both of its
output and negative input are directly accessible
for external compensation components.
An example of a suitable compensation network is
shown in Fig.2. It consists of a capacitor
Cvc1=2.2nF and a resistor Rcv1=22K
in series.
Vout
Iout
Voltage regulation
C
u
rr
ent
r
egulat
ion
TSM1012 Vcc : independent power supply
0
Secondary current regulation
TSM1012 Vcc : On power output
Primary current regulation
TSM1012
PRINCIPLE OF OPERATION AND APPLICATION HINTS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSM1012IST | 功能描述:电池管理 Lo consumption Vltg Current Controller 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 |
| TSM1013 | 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 |
| TSM1013AI | 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 |
| TSM1013AID | 功能描述:电池管理 Constant Vltg Current Controller 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 |
| TSM1013AIDT | 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 |
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