參數(shù)資料
型號(hào)： L6599AN
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, DIP16
封裝： ROHS COMPLIANT, DIP-16
文件頁數(shù)： 9/36頁
文件大?。?/td> 1595K
代理商： L6599AN
L6599A
Application information
Doc ID 15308 Rev 5
17/36
7
Application information
The L6599A is an advanced double-ended controller specific for resonant half-bridge
topology (see Figure 21.). In these converters the switches (MOSFETs) of the half-bridge
leg are alternately switched on and off (180° out-of-phase) for exactly the same time. This is
commonly referred to as operation at “50% duty cycle”, although the real duty cycle, that is
the ratio of the on-time of either switch to the switching period, is actually less than 50%.
The reason is that there is an internally fixed dead-time TD inserted between the turn-off of
either MOSFET and the turn-on of the other one, where both MOSFETs are off. This dead-
time is essential in order for the converter to work correctly: it will ensure soft-switching and
enable high-frequency operation with high efficiency and low EMI emissions.
To perform converter's output voltage regulation the device is able to operate in different
modes (Figure 20), depending on the load conditions:
1.
Variable frequency at heavy and medium/light load. A relaxation oscillator (see
Section 7.1: Oscillator for more details) generates a symmetrical triangular waveform,
which MOSFETs' switching is locked to. The frequency of this waveform is related to a
current that will be modulated by the feedback circuitry. As a result, the tank circuit
driven by the half-bridge will be stimulated at a frequency dictated by the feedback loop
to keep the output voltage regulated, thus exploiting its frequency-dependent transfer
characteristics.
2.
Burst-mode control with no or very light load. When the load falls below a value, the
converter will enter a controlled intermittent operation, where a series of a few
switching cycles at a nearly fixed frequency are spaced out by long idle periods where
both MOSFETs are in OFF-state. A further load decrease will be translated into longer
idle periods and then in a reduction of the average switching frequency. When the
converter is completely unloaded, the average switching frequency can go down even
to few hundred hertz, thus minimizing magnetizing current losses as well as all
frequency-related losses and making it easier to comply with energy saving
recommendations.
Figure 20.
Multi-mode operation of the L6599A
相關(guān)PDF資料
PDF描述
L6599ATDTR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6599D 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
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L6599TR 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6610D 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6599ATD 功能描述:電壓模式 PWM 控制器 Sgl Output 13.3 V 200 KHz SOIC-16 Nrw RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
L6599ATDTR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 IMPROVED High-Volt RESONANT CONTROLLER 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
L6599ATN 制造商:STMicroelectronics 功能描述:
L6599D 功能描述:軟開關(guān) PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6599DTR 功能描述:軟開關(guān) PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
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