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參數(shù)資料
| 型號(hào)： | L6599D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | High-voltage resonant controller |
| 中文描述： | 高壓諧振控制器 |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 591K |
| 代理商： | L6599D |
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Application information
L6599
18/36
7.2
Operation at no load or very light load
When the resonant half-bridge is lightly loaded or unloaded at all, its switching frequency will
be at its maximum value. To keep the output voltage under control in these conditions and to
avoid losing soft-switching, there must be some significant residual current flowing through
the transformer's magnetizing inductance. This current, however, produces some
associated losses that prevent converter's no-load consumption from achieving very low
values.
To overcome this issue, the L6599 enables the designer to make the converter operate
intermittently (burst-mode operation), with a series of a few switching cycles spaced out by
long idle periods where both MOSFETs are in OFF-state, so that the average switching
frequency can be substantially reduced. As a result, the average value of the residual
magnetizing current and the associated losses will be considerably cut down, thus
facilitating the converter to comply with energy saving recommendations.
The device can be operated in burst-mode by using pin 5 (STBY): if the voltage applied to
this pin falls below 1.25V the IC will enter an idle state where both gate-drive outputs are
low, the oscillator is stopped, the soft-start capacitor C
SS
keeps its charge and only the 2V
reference at RF
min
pin stays alive to minimize IC's consumption and V
CC
capacitor's
discharge. The IC will resume normal operation as the voltage on the pin exceeds 1.25V by
50mV.
To implement burst-mode operation the voltage applied to the STBY pin needs to be related
to the feedback loop.
Figure 23
shows the simplest implementation, suitable with a narrow
input voltage range (e.g. when there is a PFC front-end).
Figure 23. Burst-mode implementation: narrow input voltage range.
Figure 24. Burst-mode implementation: wide input voltage range.
L6599
STBY
4
5
RFmin
R
Fmin
R
Fmax
R
Fmin
R
Fmax
L6599
L6599
STBY
4
5
RFmin
R
Fmin
R
Fmax
7
LINE
R
A
B+
R
B
R
C
RD
R
D
RC
R
A
+ R
B
>> R
C
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| 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 |
| L6599N | 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 |
| L6599NR | 功能描述:電壓模式 PWM 控制器 HV resonant CNTRL 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 |
| L6599TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High-voltage resonant controller |
| L65B | 制造商:Electro-Mech 功能描述: |
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