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参数资料
| 型号： | L6599ADTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO16 |
| 封装： | ROHS COMPLIANT, SOP-16 |
| 文件页数： | 24/36页 |
| 文件大小： | 1595K |
| 代理商： | L6599ADTR |
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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.
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:
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相关代理商/技术参数 |
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| L6599AFD | 功能描述:Power Supply Controller Resonant Converter Controller 16-SO 制造商:stmicroelectronics 系列:- 包装:管件 零件状态:有效 应用:谐振转换器控制器 电压 - 输入:- 电压 - 电源:8.85 V ~ 16 V 电流 - 电源:3.5mA 工作温度:-50°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商器件封装:16-SO 标准包装:50 |
| L6599AN | 功能描述:电压模式 PWM 控制器 Hi-Volt resonant controller, 500KHz RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6599ATD | 功能描述:电压模式 PWM 控制器 Sgl Output 13.3 V 200 KHz SOIC-16 Nrw RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6599ATDTR | 功能描述:开关变换器、稳压器与控制器 IMPROVED High-Volt RESONANT CONTROLLER RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6599ATN | 制造商:STMicroelectronics 功能描述: |
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