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现代DC-DC开关转换器,包括开关稳压器、开关控制器以及具有多相输出的PMIC,如果能够支持多相操作,则可获得其它优势。

多相转换器由多路电源并联,驱动一个公共负载。每路电源的开关信号彼此错相。例如,一路电源的开关断开,而另一路电源开关则闭合。各路电源以相同的时钟频率连续工作。

多相操作具有诸多性能优势。由于开关周期内吸收的电流平均分配,输出电流和电压纹波有效降低(下降幅度与相数成比例),无需工作在相对较高的频率——后者将导致开关损耗增大。最大瞬态输入电流降低,使电源纹波噪声更低。相对于相同工作频率的单相操作,多相操作具有更高效率、更少元件(BOM)。此外,多相稳压器能够更快速地响应输出负载的变化,具有更好的瞬态响应。

对于设计用于大电流输出的电路,例如10A,优势会更加明显。当然,输出电流较低时,同样具备一定优势,例如要求的输入和输出滤波电容较小。

降压型(Buck)多相开关稳压器(内部开关)
降压型(Buck)多相开关控制器(外部开关)
升压型(Boost)多相开关稳压器(内部开关)



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参考设计

MAXREFDES1046:宽输入范围、3.3V/3A输出同步整流、降压型DC-DC转换器,两层电路板设计降低成本

The MAX17574, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrat...

MAXREFDES1105: Miniature, 5V/2A, Synchronous, No-Opto Flyback DC-DC Converter with 90.4% Efficiency Using MAX17690 and MAX17606

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1102:小尺寸、24V/250mA、无光耦、反激DC-DC转换器,92%效率

The MAX17690 implements an innovative algorithm to accurately determine the output voltage by se...

MAXREFDES1045: Two-Layer Board, 5V/3A, Wide-Input, Synchronous, Step-Down DC-DC Converter Using the MAX17574

The MAX17574, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrat...

MAXREFDES1037:72W Offline Flyback Converter

The MAX17595 is a peak-current-mode controller for designing wide input-voltage flyback regulato...

MAXREFDES1004:-73V至-35V输入、5V/100mA输出、Boost转换器

The MAX668/MAX669 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controlle...

MAXREFDES1088:小尺寸、12V/250mA、同步、无光耦、反激DC-DC转换器,91.9%效率

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1106: Miniature, 12V/1A, Synchronous, No-Opto Flyback DC-DC Converter with 92% Efficiency Using MAX17690 and MAX17606

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1101:Miniature, 12V/500mA, No-Opto Flyback DC-DC Converter with 90% Efficiency

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1099: Miniature, 24V/500mA, No-Opto Flyback DC-DC Converter with 93% Efficiency Using the MAX17690

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1177: PoE Powered Device and 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

Power over Ethernet (PoE) is a technology that allows network cables to deliver power to a power...

MAXREFDES1104: Miniature, 5V/2A, Synchronous, No-Opto Flyback DC-DC Converter with 90% Efficiency Using MAX17690 and MAX17606

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1020:High Efficiency, Current Mode, Synchronous DC-DC Converter with a 0.68V/4A Output

The MAX15118 high-efficiency, current-mode step-down regulator with integrated power switches op...

MAXREFDES1150:智能药瓶

The MAXREFDES1150 is Maxim’s smart pill bottle design for medical and broad IoT applications.

MAXREFDES1165: 32-Channel Industrial Digital I/O Module

The MAXREFDES1165 is a complete, 32-channel industrial digital I/O module comprising 16 digital ...