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参数资料
| 型号： | L6731D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | HTSSOP-16 |
| 文件页数： | 5/23页 |
| 文件大小： | 386K |
| 代理商： | L6731D |
L6731D
Device description
13/23
The reference of the error amplifier is clamped with this voltage (Vss) until it reaches the
programmed value. The L6731D can always sink or source current. If an over current is
detected during the soft-start phase, the device provides a constant-current-protection. In
this way, in case of short soft-start time and/or small inductor value and/or high output
capacitors value and so, in case of high ripple current during the soft-start, the converter can
start in any case, limiting the current (see 5.8: Monitoring and protections) but not entering
in HICCUP mode. During normal operation, if any under-voltage is detected on one of the
two supplies, the SS pin is internally shorted to GND and so the SS capacitor is rapidly
discharged.
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 does not work when the high-side body diode is conducting
because the phase node does not 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 7.).
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
Figure 7.
OVP
LGate
FB
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相关代理商/技术参数 |
参数描述 |
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| L6731DTR | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6732 | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6732_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732_0906 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732C | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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