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参数资料
| 型号： | TSM101IN |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 10/13页 |
| 文件大小： | 387K |
| 代理商： | TSM101IN |
TSM101/A
6/13
Figure 2 : SMPS Using a TL431 as Voltage Controller
The optocoupler current increases and tends to
reduce the output voltage by the way of the PWM
controller.
By enabling the TSM101 current source (pin 2) it
is possible to offset the current sensing by a volt-
age equal to :
Voff # R4 * Io with Io = 1.4mA
This offset lowers the output charge current and
this function can be used to charge two types of
batteries having different capacities. The current
source is enabled by connecting pin 2 to ground
3 - CALCULATION OF THE ELEMENTS
The charge current is regulated at 700mA (if the
charge control input is left open) or 200mA (if the
charge control input is put to ground ), allowing the
charge of two different types of batteries.
3.1 - Voltage limitation
The end-of- charge voltage is limited at 1.45V/cell,
this is the recommended voltage for an ambient
temperature at 25oC.
A diode is generally inserted at the output of the
charger to avoid the discharge of the battery if the
charger is not powered. This diode is sometimes
directly integrated in the battery pack. The influ-
ence of this diode on the charge is negligible if the
voltage drop (0.7V) is taken into account during
the design of the charger.
The voltage at the output of the charger is :
V
out =
and regarding R6 and R7 :
R6=
P1, which is a part of R6 and R7 is not considered
in this equation.
The following values are used on the application
board :
R7 = 12k
R6 = 1k
P1 = 220, adjust for V
output = 15.2V with the
battery replaced by a 1k
resistor
R10 = short circuit
C3 = 100nF
3.2 - Current regulation
R5 is the sense resistor used for current measure-
ment.
The current regulation is effective when the volt-
age drop across R5 is equal to the voltage on pin
5 of the TSM101 (assuming that the internal cur-
rent source is disabled).
For medium currents (<1A), a voltage drop across
R5 of 200mV = Vr5 is a good value, R5 can be re-
alized with standard low cost 0.5W resistors in
parallel.
R5 =
, R5 = 0.285
(four 1.2 resistor in
parallel)
R2 and R3 can be chosen using the following for-
mula :
R2 =
CHARGE CONTROL
If the pin 2 is left open, the charge current is nom-
inal at # 700mA.
R6
R 7
+
R6
----------------------
V
r
×
Vref
Vout
Vref
–
--------------------------------
R7
×
Vr5
Ich
----------
R3
Vref
Vr5
–
Vr5
----------------------------
×
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSM101IP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| TSM101N | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:VOLTAGE AND CURRENT CONTROLLER |
| TSM101P | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:VOLTAGE AND CURRENT CONTROLLER |
| TSM101电池充电电路 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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