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参数资料
| 型号： | L6725 |
| 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： | SOP-16 |
| 文件页数： | 8/32页 |
| 文件大小： | 812K |
| 代理商： | L6725 |
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Device description
L6725 - L6725A
16/32
5.11
Synchronization
The presence of many converters on the same board can generate beating frequency noise. To
avoid this it is important to make them operate at the same switching frequency. Moreover, a
phase shift between different modules helps to minimize the RMS current on the common input
capacitors. Figure 10. and Figure 11. shows the results of two modules in synchronization. Two
or more devices can be synchronized simply connecting together the SYNCH pins. The device
with the higher switching frequency will be the Master while the other one will be the Slave. The
Slave controller will increase its switching frequency reducing the ramp amplitude proportionally
and then the modulator gain will be increased.
To avoid a huge variation of the modulator gain, the best way to synchronize two or more
devices is to make them work at the same switching frequency and, in any case, the switching
frequencies can differ for a maximum of 50% of the lowest one. If, during synchronization
between two (or more) L6725A, it's important to know in advance which the master is, it's timely
to set its switching frequency at least 15% higher than the slave. Using an external clock signal
(fEXT) to synchronize one or more devices that are working at a different switching frequency
(fSW) it is recommended to follow the below formula:
The phase shift between master and slaves is approximately 180°.
Figure 10. Synchronization: PWM Signal
Figure 11. Synchronization: Inductor Currents
SW
EXT
SW
f
≤
3
,
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6725_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Voltage mode PWM controller with bootstrap anti-discharging system |
| L6725A | 功能描述:开关变换器、稳压器与控制器 Vltg Mode PWM 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 |
| L6725ATR | 功能描述:开关变换器、稳压器与控制器 Step-Down 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 |
| L6725TR | 功能描述:电压模式 PWM 控制器 Adjustable Step Down Controller 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 |
| L6726 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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