參數(shù)資料
型號： L6711TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, TQFP-48
文件頁數(shù)： 20/50頁
文件大小： 679K
代理商： L6711TR
Obsolete
Product(s)
- Obsolete
Product(s)
L6711
Voltage positioning
27/50
The ITS circuit subtracts from the IFB current a current proportional to the sensed
temperature as follow (see Figure 11, Only the IDROOP and ITC contributes to IFB have been
considered):
where
where A and B are positive constants depending on the value of the external resistor RTC
(see Figure 12), TJ is the device junction temperature and TMOS is the mosfet (or the used
sensing element) temperature.
The resistor RTC can be designed in order to zero the temperature influence on the output
voltage at a fixed current as follow:
obtaining the following relationship:
where RSENSE is the sensing element resistance value (at TMOS = 25C), B is the constant
obtainable from
Figure 12, kT is the Temperature Coupling Coefficient between the sensing element and the
Controller (it results KT = (TJ-25)/(TMOS-25)) and α is the Temperature Coefficient of the
sensing element. Since RTC depends from the constant B depending in turn from RTC, an
iterative process is required to properly design the RTC value. As a consequence of the
nature of the thermal sensor, a negative offset is needed to compensate the native offset
introduced by the ITS at a referenced temperature Tref and it is obtainable by connecting a
ROFFSET resistor between the OFFSET pin and SGND as follow:
To disable this function, short the pin to SGND.
Figure 12.
Integrated thermal sensor constant vs. external resistor RTC
V
OUT T,IOUT
()
VID
R
FB
R
SEN SE TMOS
()
Rg
------------------------------------------ IOUT ITC TJ
()
–
–
=
I
TC TJ
()
1
R
TC
-----------
AB
T
J
25
–
()
+
[]
=
R
FB
R
SENSE α
T
MOS
25
–
()
Rg
------------------------------------------------------------------- IOUT
R
FB
R
TC
----------- BTJ 25
–
()
+
–
0
=
R
TC
Rg
R
SENSE
---------------------
Bk
T
α I
OUT
--------------------
=
I
OFFSET
I
TC Tref
()
–
AB
T
re f
25
–
()
+
R
TC
----------------------------------------------
==
450
475
500
525
550
575
600
625
650
0
1020 30
405060 7080 90 100
1.50
1.60
1.70
1.80
1.90
2.00
0
1020 3040 50 60 7080 90 100
A [mV] vs. RTC [K]
B [mV/°C] vs. RTC [K]
相關(guān)PDF資料
PDF描述
L6711 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6712 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712_05 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712AD 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6712ADTR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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