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(yè)數(shù)： 24/36頁(yè)
文件大?。?/td> 1595K
代理商： L6599AN
Application information
L6599A
30/36
Doc ID 15308 Rev 5
the function is not used the pin has to be connected to a voltage greater than 1.24 V but
lower than 6V (worst-case value of the 7 V threshold).
7.7
Bootstrap section
The supply of the floating high-side section is obtained by means of a bootstrap circuitry.
This solution normally requires a high voltage fast recovery diode (DBOOT, Figure 31a) to
charge the bootstrap capacitor CBOOT. In the L6599A a patented integrated structure,
replaces this external diode. It is realized by means of a high voltage DMOS, working in the
third quadrant and driven synchronously with the low side driver (LVG), with a diode in
series to the source, as shown in Figure 31b.
Figure 31.
Bootstrap supply: a) standard circuit;
b) internal bootstrap synchronous diode
The diode prevents any current can flow from the VBOOT pin back to Vcc in case that the
supply is quickly turned off when the internal capacitor of the pump is not fully discharged.
To drive the synchronous DMOS it is necessary a voltage higher than the supply voltage
Vcc. This voltage is obtained by means of an internal charge pump (Figure 31b).
The bootstrap structure introduces a voltage drop while recharging CBOOT (i.e. when the
low side driver is on), which increases with the operating frequency and with the size of the
external power MOS. It is the sum of the drop across the R(DS)ON and the forward drop
across the series diode. At low frequency this drop is very small and can be neglected but,
as the operating frequency increases, it must be taken into account. In fact, the drop
reduces the amplitude of the driving signal and can significantly increase the R(DS)ON of the
external high-side MOSFET and then its conductive loss.
This concern applies to converters designed with a high resonance frequency (indicatively,
> 150 kHz), so that they run at high frequency also at full load. Otherwise, the converter will
run at high frequency at light load, where the current flowing in the MOSFETs of the half-
bridge leg is low, so that, generally, an R(DS)ON rise is not an issue. However, it is wise to
check this point anyway and the following equation is useful to compute the drop on the
bootstrap driver:
相關(guān)PDF資料
PDF描述
L6599ATDTR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
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L6599TR 0.8 A 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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