參數(shù)資料
型號(hào)： L6591TR
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁(yè)數(shù)： 7/32頁(yè)
文件大?。?/td> 560K
代理商： L6591TR
L6591
Application information
Doc ID 14821 Rev 4
15/32
Figure 7.
Timing diagram showing short-circuit behavior
(SS pin clamped below 5 V)
5.2
Operation at no load or very light load
When the PWM control voltage at pin COMP falls below a threshold located at 1.75 V, the IC
is disabled with both the high-side and the low-side MOSFET kept in OFF-state, the
oscillator stopped and the quiescent consumption very much reduced to minimize Vcc
capacitor discharge.
The control voltage now will increase as a result of the feedback reaction to the energy
delivery stop and, as it exceeds 1.82 V, the IC will restart switching. After a while, the control
voltage will go down again in response to the energy burst and stop the IC. In this way the
converter will work in a burst-mode fashion with a nearly constant peak current. A further
load decrease will then cause a frequency reduction, which can go down even to few
hundred hertz, thus minimizing all frequency-related losses and making it easier to comply
with energy saving regulations. The timing diagram of Figure 8 illustrates this kind of
operation, showing the most significant signals.
If it is necessary to decrease the intervention threshold of the burst-mode operation, this can
be done by adding a small DC offset on the current sense pin as shown in Figure 9.
Note: The offset reduces the available dynamics of the current signal; thereby, the value of
the sense resistor must be determined taking this offset into account.
Vcc
LVG,HVG
Vcc_OK
相關(guān)PDF資料
PDF描述
L6599AN SWITCHING CONTROLLER, DIP16
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L6599N 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP16
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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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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(chēng):STMicroelectronics 功能描述:High voltage resonant controller
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