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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)： | 18/31頁 |
| 文件大?。?/td> | 861K |
| 代理商： | L6599ATDTR |
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L6599AT
Application information
Doc ID 15534 Rev 3
25/31
the function is not used the pin must be connected to a voltage greater than 1.24 V but lower
than 6 V (worst-case value of the 7 V threshold).
6.7
Bootstrap section
The supply of the floating high-side section is obtained by means of bootstrap circuitry. This
the bootstrap capacitor CBOOT. In the L6599AT, a patented integrated structure replaces this
external diode. It is achieved 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 14b.
Figure 14.
Bootstrap supply: a) standard circuit;
b) internal bootstrap synchronous diode
The diode prevents any current flowing from the VBOOT pin back to Vcc if the supply is
quickly turned off when the internal capacitor of the pump is not fully discharged. To drive
the synchronous DMOS a voltage higher than the supply voltage Vcc is necessary. This
voltage is obtained by means of an internal charge pump (Figure 14b).
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 runs
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:
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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 |
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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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