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参数资料
| 型号： | L6599ATDTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 4/31页 |
| 文件大小： | 861K |
| 代理商： | L6599ATDTR |
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Application information
L6599AT
12/31
Doc ID 15534 Rev 3
6
Application information
The L6599AT is an advanced double-ended controller specifically designed for resonant
half-bridge topology (see Figure 4.). 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 interval. 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, where both MOSFETs
are off. This dead- time is essential for the converter to work correctly; it ensures soft-
switching and enable high-frequency operation with high efficiency and low EMI emissions.
To perform output voltage regulation of the converter, the device is capable of operating in
different modes (Figure 3), depending on the load conditions:
1.
Variable frequency at heavy and medium/light load. A relaxation oscillator (see
Section 6.1: Oscillator for more details) generates a symmetrical triangular waveform,
to which the MOSFETs' switching is locked. The frequency of this waveform is related
to a current that is modulated by the feedback circuitry. As a result, the tank circuit
driven by the half-bridge is 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 certain value,
the converter enters 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 an OFF-state. A further load decrease is translated into longer
idle periods, and then into a reduction of the average switching frequency. When the
converter is completely unloaded, the average switching frequency can go down to
even a few hundred hertz, thus minimizing any magnetizing current losses as well as all
frequency-related losses, and making it easier to comply with energy saving
recommendations.
Figure 3.
Multi-mode operation of the L6599AT
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| 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 |
| L6610D | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| L6610N | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6599ATN | 制造商:STMicroelectronics 功能描述: |
| L6599D | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599DTR | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599N | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599NR | 功能描述:电压模式 PWM 控制器 HV resonant CNTRL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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