- 您现在的位置：买卖IC网 > PDF目录43901 > L6732 (STMICROELECTRONICS) SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 PDF资料下载
参数资料
| 型号： | L6732 |
| 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： | 14/37页 |
| 文件大小： | 898K |
| 代理商： | L6732 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页
L6732
Device description
21/37
5.12
Bootstrap anti-discharging system
This built-in system avoids that the voltage across the bootstrap capacitor becomes less
than 3.3 V. An internal comparator senses the voltage across the external bootstrap
capacitor keeping it charged, eventually turning-on the low-side MOSFET for approximately
200 ns. If the bootstrap capacitor is not enough charged the high-side MOSFET cannot be
effectively turned-on and it will present a higher RDS(on). In some cases the OCP can be
also triggered. The bootstrap capacitor can be discharged during the soft-start in case of
very long soft-start time and light loads. It's also possible to mention one application
condition during which the bootstrap capacitor can be discharged:
5.12.1
Fan's power supply
In many applications the FAN is a DC MOTOR driven by a voltage-mode DC/DC converter.
Often only the speed of the MOTOR is controlled by varying the voltage applied to the input
terminal and there's no control on the torque because the current is not directly controlled.
In order to vary the MOTOR speed the output voltage of the converter must be varied. The
L6732 has a dedicated pin called EAREF (see the related section) that allows providing an
external reference to the non-inverting input of the error-amplifier.
In these applications the duty cycle depends on the MOTOR's speed and sometimes 100 %
has to be set in order to go at the maximum speed. Unfortunately in these conditions the
bootstrap capacitor can not be recharged and the system cannot work properly. Some PWM
controller limits the maximum duty-cycle to 80-90 % in order to keep the bootstrap cap
charged but this make worse the performance during the load transient. Thanks to the
“bootstrap anti-discharging system” the L6732 can work at 100 % without any problem. The
following picture shows the device behavior when input voltage is 5 V and 100 % is set by
the external reference.
Figure 16.
100 % duty cycle operation
相关PDF资料 |
PDF描述 |
|---|---|
| L6732TR | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6788ATR | 3-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| L6788A | 3-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| L6910A | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6910GTR | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| L6732CTR | 功能描述:开关变换器、稳压器与控制器 Step-Dwn 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 |
| L6732TR | 功能描述:DC/DC 开关控制器 VOLTAGE REGULATOR 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 |
发布紧急采购，3分钟左右您将得到回复。