參數(shù)資料
型號(hào)： L6732CTR
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： HTSSOP-16
文件頁(yè)數(shù)： 10/32頁(yè)
文件大?。?/td> 905K
代理商： L6732CTR
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5 Device description
L6732C
18/32
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) L6732C, 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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L6733 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6733TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6738 功能描述:電流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738A 功能描述:電流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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