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參數(shù)資料
| 型號： | L6599ATDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOP-16 |
| 文件頁數(shù)： | 8/31頁 |
| 文件大小： | 861K |
| 代理商： | L6599ATDTR |
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Application information
L6599AT
16/31
Doc ID 15534 Rev 3
Figure 7.
Burst-mode implementation:
a) narrow input voltage range; b) wide input voltage range
Essentially, RFmax defines the switching frequency fmax above which the L6599AT enters
burst-mode operation. Once fixed fmax, RFmax is derived from the relationship:
Equation 3
fmax is associated to a load PoutB greater than the minimum. PoutB is such that the
transformer's peak currents are low enough not to cause audible noise.
The resonant converter's switching frequency, however, depends also on the input voltage.
Therefore, in cases where there is quite a large input voltage range with the circuit of
the arrangement shown in Figure 7b, where the information on the converter's input voltage
is added to the voltage applied to the STBY pin. Due to the strongly non-linear relationship
between switching frequency and input voltage, it is more practical to find empirically the
right amount of correction RA / (RA + RB) needed to minimize the change of PoutB. Care
should be taken to choose a total value of RA + RB that is much greater than RC to minimize
the effect on the LINE pin voltage (see Section 6.6: Line sensing function).
Whichever circuit is used, its operation can be described as follows. As the load falls below
the value PoutB the frequency tries to exceed the maximum programmed value fmax and the
voltage on the STBY pin (VSTBY) falls below 1.24 V. The IC then stops with both gate-drive
outputs low, so that both MOSFETs of the half-bridge leg are in an OFF-state. The voltage
VSTBY now increases as a result of the feedback reaction to the energy delivery stop and, as
it exceeds 1.29 V, the IC starts switching again. After a while, VSTBY goes down again in
response to the energy burst and stops the IC. In this way the converter works in a burst-
mode fashion with a nearly constant switching frequency. A further load decrease then
causes a frequency reduction, which can go down to even a few hundred hertz. The timing
diagram of Figure 8 illustrates this kind of operation, showing the most significant signals. A
small capacitor (typically in the hundred pF range) from the STBY pin to ground, placed as
close to the IC as possible to reduce switching noise pick-up, helps get clean operation.
To help the designer meet energy saving requirements even in power-factor-corrected
systems, where a PFC pre-regulator precedes the DC-DC converter, the L6599AT allows
the PFC pre-regulator to be turned off during burst-mode operation, thereby eliminating the
1
f
RF
8
3
RF
min
max
min
max
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| 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 |
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