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參數(shù)資料
| 型號： | TSM1011 |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Constant Voltage and Constant Current Controller for Battery Chargers and Adapters |
| 中文描述： | 恒定電壓和恒定的電池充電器和適配器電流控制器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 167K |
| 代理商： | TSM1011 |
Voltage and Current Control
TSM1011
5/9
5 VOLTAGE AND CURRENT CONTROL
5.1 Voltage Control
The voltage loop is controlled via a first
transconductance
operational
resistor bridge R
1
, R
2
, and the optocoupler which
is directly connected to the output.
amplifier,
the
The relative values of R
1
and R
2
should be
chosen in accordance with
Equation 1
:
Equation 1
where V
out
is the desired output voltage.
To avoid discharge of the load, the resistor bridge
R
1
, R
2
should have high impedance. For this type
of application, a total value of 100k
(or more)
would be appropriate for the resistors R
1
and R
2
.
For example, if R
2
= 100k
, V
out
= 4.10V,
V
ref
=2.5V, then R
1
= 41.9K
.
Note: If the low drop diode is to 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
V
out
by (
V
out
+ V
drop
).
5.2 Current control
The current loop is controlled via the second
transconductance operational amplifier, the sense
resistor R
sense
, and the optocoupler.
V
sense
threshold is achieved externally by a
resistor bridge tied to the V
ref
voltage reference.
Its midpoint 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 bridge are matched to provide the
best precision possible
.
The control equation verifies that:
Equation 2
Equation 2’
where I
lim
is the desired limited current, and
V
sense
is the threshold voltage for the current
control loop.
Note that the R
sense
resistor should be chosen
taking into account the maximum dissipation
(P
lim
) through it during full load operation.
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
transconductance 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.
current
sinking
outputs
of
the two
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.
Fig. 3:
Output voltage versus output current
R1
R
2
V
–
V
out
V
ref
--------------------------
=
R
sense
I
lim
V
sense
V
R
4
+
=
V
sense
R
5
R
5
--------------------
=
I
lim
R
V
R
5
+
R
4
(
)
R
sense
-----------------------------------------------
=
P
lim
V
sense
I
lim
=
Vout
Iout
Voltage regulation
C
TSM1011 Vcc : independent power supply
Secondary current regulation
0
TSM1011 Vcc : On power output
Primary current regulation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TSM1011AID | Constant Voltage and Constant Current Controller for Battery Chargers and Adapters |
| TSM1011AIS | Constant Voltage and Constant Current Controller for Battery Chargers and Adapters |
| TSM1011IS | Constant Voltage and Constant Current Controller for Battery Chargers and Adapters |
| TSM1011ID | Multiconductor Cable; Number of Conductors:2; Conductor Size AWG:16; No. Strands x Strand Size:19 x 29; Jacket Material:Polyvinylchloride (PVC); Number of Pairs:1; Features:Unshielded; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| TSM1012 | LOW CONSUMPTION VOLTAGE AND CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSM1011_0311 | 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 |
| TSM1011AID | 功能描述:電池管理 Constant Vltg Current Controller 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 |
| TSM1011AIDT | 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 |
| TSM1011AIS | 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 |
| TSM1011AIST | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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