參數(shù)資料
型號(hào)： 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(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 560K
代理商： L6591TR
Application information
L6591
12/32
Doc ID 14821 Rev 4
5
Application information
The L6591 is an advanced current-mode PWM controller specific for fixed-frequency, peak-
current-mode-controlled ZVS half-bridge converters. In these converters the switches
(MOSFET’s) are controlled with complementary duty cycle: the high-side MOSFET is driven
ON for a duty cycle D and the low-side MOSFET for a duty cycle 1-D. For a proper operation
the maximum allowed duty cycle must be limited below 50%.
An externally programmable dead-time TD inserted between the turn-off of one MOSFET
and the turn-on of the other one ensures soft-switching and enables high-frequency
operation with high efficiency and low EMI emissions. See Section 5.6: Oscillator and dead-
time programming on page 19 section for more information on how to program TD.
The device is able to operate in different modes (Figure 4), depending on the converter’s
load conditions:
1.
Fixed frequency at heavy load. A relaxation oscillator, externally programmable with a
capacitor and a resistor generates a sawtooth and releases clock pulses during the
falling edges of the sawtooth. In this region the low-side MOSFET is turned off by the
even pulses of the clock signal and the high-side MOSFET is turned on after a delay;
the high-side MOSFET is turned off and, after a delay, the low-side MOSFET is turned
on in response to the control loop.
2.
Burst-mode control with no or very light load. When the load is extremely light or
disconnected, the converter will enter a controlled on/off operation with fixed duty cycle,
where a series of few switching cycles are spaced out by long periods where both
MOSFET
’s are in OFF-state. A load decrease will be then translated into 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. Being the peak current very low, no issue of audible noise arises.
Figure 4.
Multi-mode operation
相關(guān)PDF資料
PDF描述
L6599AN SWITCHING CONTROLLER, DIP16
L6599ATDTR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6599D 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6599N 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP16
L6599TR 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
L6598_04 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH VOLTAGE RESONANT CONTROLLER
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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