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參數(shù)資料
| 型號： | L6591TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO16 |
| 封裝： | ROHS COMPLIANT, SOP-16 |
| 文件頁數(shù)： | 15/32頁 |
| 文件大小： | 560K |
| 代理商： | L6591TR |
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Application information
L6591
22/32
Doc ID 14821 Rev 4
5.8
Line sensing function
This function basically stops the IC as the input voltage to the converter falls below the
specified range and lets it restart as the voltage goes back within the range. The sensed
voltage can be either the rectified and filtered mains voltage, in which case the function will
act as a brownout protection, or, in systems with a PFC pre-regulator front-end, the output
voltage of the PFC stage, in which case the function will serve as a power-on and power-off
sequencing.
L6591 shutdown upon input under voltage is accomplished by means of an internal
comparator, as shown in the block diagram of Figure 17, whose non-inverting input is
available at the LINE pin (#1). The comparator is internally referenced to 1.25 V and
disables the IC if the voltage applied at the LINE pin is below the internal reference. Under
these conditions the soft-start discharged, the pin PFC_STOP is open and the consumption
of the IC is reduced. PWM operation is re-enabled as the voltage on the pin is above the
reference. The comparator is provided with current hysteresis instead of a more usual
voltage hysteresis: an internal 15 A current sink is ON as long as the voltage applied at the
LINE pin is below the reference and is OFF if the voltage is above the reference.
Figure 15.
Line sensing function: internal block diagram and timing diagram
This approach provides an additional degree of freedom: it is possible to set the ON
threshold and the OFF threshold separately by properly choosing the resistors of the
external divider (see below). With voltage hysteresis, instead, fixing one threshold
automatically fixes the other one depending on the built-in hysteresis of the comparator.
With reference to Figure 17, the following relationships can be established for the ON
(VinON) and OFF (VinOFF) thresholds of the input voltage:
+
-
L6591
Vin OK
HV Input bus
3V
LINE
Vcc
1
9
1.25V
15A
RH
HV Input bus
Vin OK
VinON
VinOFF
LVG, HVG
Vout
LINE
IHYS
t
RL
1.25V
15A
Vcc
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| L6598 | 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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| L6598D | 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| L6598D013TR | 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| L6598D016TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High voltage resonant controller |
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