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参数资料
| 型号： | L6732TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, HTSSOP-16 |
| 文件页数： | 8/37页 |
| 文件大小： | 898K |
| 代理商： | L6732TR |
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Device description
L6732
16/37
5.7
Driver section
The high-side and low-side drivers allow using different types of power MOSFETs (also
multiple MOSFETs to reduce the RDS(on) maintaining fast switching transitions.
The low-side driver is supplied by VCCDR while the high-side driver is supplied by the BOOT
pin. A predictive dead time control avoids MOSFETs cross-conduction maintaining very
short dead time duration in the range of 20 ns. The control monitors the phase node in order
to sense the low-side body diode recirculation. If the phase node voltage is less than a
certain threshold (-350 mV typ.) during the dead time, it will be reduced in the next PWM
cycle. The predictive dead time control doesn't work when the high-side body diode is
conducting because the phase node doesn't go negative. This situation happens when the
converter is sinking current for example and, in this case, an adaptive dead time control
operates.
5.8
Monitoring and protections
The output voltage is monitored by means of pin FB. If it is not within ±10 % (typ.) of the
programmed value, the Power good (PGOOD) output is forced low.
The device provides over-voltage-protection: when the voltage sensed on FB pin reaches a
value 20% (typ.) greater than the reference, the low-side driver is turned on as long as the
over voltage is detected (see Figure 10.).
It must be taken into account that there is an electrical network between the output terminal
and the FB pin and therefore the voltage at the pin is not a perfect replica of the output
voltage. However due to the fact that the converter can sink current, in the most of cases the
low-side will turn-on before the output voltage exceeds the over-voltage threshold, because
the error amplifier will throw off balance in advance. Even if the device doesn't report an
over-voltage, the behavior is the same, because the low-side is turned-on immediately. The
following figure shows the device behavior during an over-voltage event. The output voltage
Figure 10.
OVP
LGate
FB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6733 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6733TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6738 | 功能描述:电流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6738A | 功能描述:电流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6738ATR | 功能描述:电流型 PWM 控制器 Single Phase PWM CNTRL Light-Load EFF RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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