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參數(shù)資料
| 型號(hào)： | TSM108ID |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | AUTOMOTIVE SWITCH MODE VOLTAGE AND CURRENT CONTROLLER |
| 中文描述： | 汽車開關(guān)模電壓和電流控制器 |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大小： | 257K |
| 代理商： | TSM108ID |
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TSM108
10/13
K
K
Vin = Vcc = 12V, Iout = 625mA, Vout = 6V
Mosfet: Pchannel Mosfet: Rdson = 100m
,
Ciss = 1nF.
Driver: TSM108
PWM frequency: 100kHz
Free wheel diode: Vf = 0.7V
Shunt: Rsense = 330m
The efficiency (
η
) of a regulator is defined as the
ratio of the charging power (Pout) to the total
power from the supply (Pin).
K
Eq3:
η
= Pout/Pin
The output power is:
Pout=Iout x Vout where Iout is the charging
current (Vsense/Rsense = 625mA at full load) and
Vout is the regulated voltage (Vref(1+R1/R2) =
6V).
Pout = 3.75W
The input power can be found by adding the
output power (Pout) to the total power loss in the
circuit (Plosses) i.e.
K
Pin = Pout + Plosses
The power is lost partly on the chip and partly on
the external components which are mainly the
diode, the switch and the shunt. Plosses = Pchip +
Pswitch + Pdiode + Pshunt.
In Plosses, we neglect the losses in the inductor
(because the current through the inductor is
smoothened making the serial resistor of the
inductor very low), and the losses in the Gate
(charge and discharge).
a. The power lost in the chip is Pchip = Vcc x Icc.
(Vcc = 12V, Icc = 6mA) Pchip = 72m
b. The power lost in the switch depends on the ON
resistance of the switch and the current passing
through it. Also there is power loss in the switch
during switching time (commutation losses) and
that depends on the switching frequency and the
rise and fall time of the switching signal.
Rise time (Pchannel goes off) depends on the
output source current of the TSM108 and the input
gate capacitance of the Mosfet.
K
K
K
K
Trise = Ciss x Vgate / Isource
Fall time (Pchannel goes on) depends on the
output sink current of the TSM108 and the input
gate capacitance of the Mosfet .
Tfall = Ciss x Vgate / Isink
Trise = 150ns and Tfall = 300ns (Vgate is approx
12V).
K
Pswitch = Prise + Pfall + Pon
where:
Prise = Iout x (Vcc+Vf) x Trise x PWMfreq / 2
Prise = 625mA x 12.7 x 150ns x 100kHz / 2.
Prise = 59.5mW
where:
Pfall = Iout x (Vcc+Vf) x Tfall x PWMfreq / 2
Pfall = 625mA x 12.7 x 300ns x 100kHz / 2.
Pfall = 119.1mW
where:
Pon = Rdson x Iout2 x D (where D is the duty cycle
- at full charge, D can be approximated to 1)
Pon = 100m
x 625mA2. Pon = 39.1mW
K
Pswitch = 217.7mW
c. The power lost in the fly back diode is Pdiode =
Vf x Iout(1-D) where D = Vout/Vcc = 6/12. D = 0.5
K
Pdiode=219mW
d. the power lost in the sense resistor (shunt
resistor) is Pshunt = Rsense x Iout2
K
Pshunt = 129mW
Therefore,
Plosses = Pchip+Pswitch+Pdiode+Pshunt
= 72mW + 217.7mW + 219mW + 129mW
K
Plosses = 638mW
The yield (efficiency) is
K
Pout / Pin = 3.75 / (3.75 + 0.638) = 85.5%
η
= 85.5%
The following table gives a tentative efficiency
improvement view following the choice of some
external components. Be aware that some of the
following choices have non negligible cost effects
on the total application.
Improved efficiency - by changing the external components value one by one
Rsense
330m
220m
Iout
625mA
936mA
Vout (R1/R2)
6V
-
Rdson
100m
-
Ciss
0nF
-
PWM Freq
100kHz
-
Free Wheel
0.7V
-
Yield
85.5%
85.6%
Cost influence
-
=
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
7.5V
-
-
-
-
88.9%
=
140m
0.85nF
-
-
85.7%
<
50kHz
-
87.3%
>
0.3V
88.1%
>>
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TSM109 | DUAL COMPARATOR AND VOLTAGE REFERENCE |
| TSM109A | DUAL COMPARATOR AND VOLTAGE REFERENCE |
| TSM109AD | DUAL COMPARATOR AND VOLTAGE REFERENCE |
| TSM109AN | DUAL COMPARATOR AND VOLTAGE REFERENCE |
| TSM109D | DUAL COMPARATOR AND VOLTAGE REFERENCE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSM108IDT | 功能描述:電流型 PWM 控制器 Voltage/Current Cont RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)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 |
| TSM109_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual Comparator and Voltage Reference |
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