參數(shù)資料
型號(hào)： L6599AN
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, DIP16
封裝： ROHS COMPLIANT, DIP-16
文件頁(yè)數(shù)： 14/36頁(yè)
文件大?。?/td> 1595K
代理商： L6599AN
L6599A
Application information
Doc ID 15308 Rev 5
21/36
Figure 24.
Burst-mode implementation:
a) narrow input voltage range; b) wide input voltage range
Essentially, RFmax will define the switching frequency fmax above which the L6599A will
enter burst-mode operation. Once fixed fmax, RFmax will be found from the relationship:
Equation 3
Note that, unlike the fmax considered in the previous section (“Section 7.1: Oscillator“), here
fmax is associated to some load PoutB greater than the minimum one. PoutB will be such that
the transformer's peak currents are low enough not to cause audible noise.
Resonant converter's switching frequency, however, depends also on the input voltage;
hence, in case there is quite a large input voltage range with the circuit of Figure 24a the
value of PoutB would change considerably. In this case it is recommended to use the
arrangement shown in Figure 24b, 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. Just be
careful in choosing the total value RA + RB much greater than RC to minimize the effect on
the LINE pin voltage (see Section 7.6: Line sensing function).
Whichever circuit is in use, its operation can be described as follows. As the load falls below
the value PoutB the frequency will try to exceed the maximum programmed value fmax and
the voltage on the STBY pin (VSTBY) will go below 1.24 V. The IC will then stop with both
gate-drive outputs low, so that both MOSFETs of the half-bridge leg are in OFF-state. The
voltage VSTBY will now increase as a result of the feedback reaction to the energy delivery
stop and, as it exceeds 1.29 V, the IC will restart switching. After a while, VSTBY will go down
again in response to the energy burst and stop the IC. In this way the converter will work in a
burst-mode fashion with a nearly constant switching frequency. A further load decrease will
then cause a frequency reduction, which can go down even to few hundred hertz. The timing
diagram of Figure 25 illustrates this kind of operation, showing the most significant signals.
A small capacitor (typically in the hundred pF) from the STBY pin to ground, placed as close
to the IC as possible to reduce switching noise pick-up, will help 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 L6599A allows that
the PFC pre-regulator can be turned off during burst-mode operation, hence eliminating the
1
f
RF
8
3
RF
min
max
min
max
=
相關(guān)PDF資料
PDF描述
L6599ATDTR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
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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(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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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