參數(shù)資料
型號： TSM108I
廠商： 意法半導體
英文描述： AUTOMOTIVE SWITCH MODE VOLTAGE AND CURRENT CONTROLLER
中文描述： 汽車開關模電壓和電流控制器
文件頁數(shù)： 6/13頁
文件大?。?/td> 257K
代理商： TSM108I
6/13
Description of a DC/DC step down battery
charging application
1. Voltage and Current Controller
TSM108 is designed to drive a P-Channel
MOSFET transistor in Switch Mode Step Down
Converter
applications.
operational amplifiers ensure accurate Voltage
and Current Regulation.
The Voltage Control dedicated operational
amplifier acts as an error amplifier and compares
a part of the output voltage (external resistor
bridge) to an integrated highly precise voltage
reference (V
ref
).
The Current Control dedicated operational
amplifier acts as an error amplifier and compares
the drop voltage through the sense resistor to an
integrated low value voltage reference (V
s
).
These two amplified errors are ORed through
diodes, and the resulting signal (“max of”) is a
reference for the PWM generator to set the
switching duty cycle of the P-Channel MOSFET
transistor.
The PWM generator comprises an oscillator (saw
tooth) and a comparator which gives a variable
duty cycle from 0 to 95%. This PWM signal is the
direct command of the output Push Pull stage to
drive the Gate of the P-Channel MOSFET.
Thanks to this architecture, the TSM108 is ideal to
be used from a DC power supply to control the
charging Voltage and Current of a battery in
applications such as Automotive accessories for
Portable Phone charging and power supplies.
Its
two
integrated
2. Voltage Control
The Voltage Control loop is to be set thanks to an
external resistor bridge connected between the
output positive line and the Ground reference. The
middle point is to be connected to the V
pin of
TSM108, and, if R1 is the upper resistor, and R2,
the lower resistor of the bridge, the values of R1
and R2 should follow:
K
eq1: Vref = Vout x R2 / (R1 + R2)
When under Constant Voltage Control mode, the
output voltage is fixed thanks to the R1/R2 resistor
bridge.
The total value of R1 + R2 resistor bridge will
determine the necessary bleeding current to keep
the Voltage Control loop effective, even under “no
load” conditions.
The voltage compensation loop is directly
accessible from the pins Vcomp and Vref
(negative input of the Voltage Control dedicated
operational amplifier). The compensation network
is highly dependant of the conditions of use of the
TSM108
(switching
components
(R,
L,
capacitor...).
frequency,
C),
MOSFET, output
external
3. Current Control
The Current control loop is to be set thanks to the
Sense resistor which is to be placed in series on
the output positive line. The output side of the
Sense resistor should be connected to the Ictrl pin
of TSM108, and the common point between
Rsense and the filtering self L should be
connected to the Vs pin of TSM108. If Ilim is the
value of the charging current limit The value of
Rsense should verify:
K
eq2: V
s
= R
sense
x Il
im
When under Constant Current Control mode, the
output current is fixed thanks to the Rsense
resistor (under output short circuit conditions,
please refer to this corresponding section).
The wattage calibration (W) of the sense resistor
should be chosen according to:
K
eq2a: W > R
sense
x Il
im
2
The current compensation loop is directly
accessible from the pins Icomp and Ictrl (negative
input of the Current Control dedicated operational
amplifier.
The compensation network is highly dependant of
the conditions of use of the TSM108 (switching
frequency, external components (R, L, C),
MOSFET, output capacitor...).
4. PWM frequency
The internal oscillator of TSM108 is a saw tooth
waveform that can be frequency adjusted.
In
automotive
accessory
applications, it is recommended to set the
switching frequency at a typical 100kHz in order to
battery
charging
PRINCIPLE OF OPERATION AND APPLICATION HINTS
TSM108
相關PDF資料
PDF描述
TSM108ID AUTOMOTIVE SWITCH MODE VOLTAGE AND CURRENT CONTROLLER
TSM109 DUAL COMPARATOR AND VOLTAGE REFERENCE
TSM109A DUAL COMPARATOR AND VOLTAGE REFERENCE
TSM109AD DUAL COMPARATOR AND VOLTAGE REFERENCE
TSM109AN DUAL COMPARATOR AND VOLTAGE REFERENCE
相關代理商/技術參數(shù)
參數(shù)描述
TSM108ID 功能描述:電流型 PWM 控制器 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
TSM108IDT 功能描述:電流型 PWM 控制器 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
TSM108IDTH 制造商:STMicroelectronics 功能描述:VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER
TSM109 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL COMPARATOR AND VOLTAGE REFERENCE
TSM10-9.5-520-TR 制造商:E-Switch Inc 功能描述:SWITCH TACTILE 制造商:E-Switch Inc 功能描述:TSM Series
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