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AN1547

Features: 1. Switching frequency can go as high as 300 kHz (150 kHz/300 kHz fixed frequency PWM operation for Maxim 797)2. Very low quiescent current. Typically 375 mA3. High efficiency; can achieve as high as 96%4. Adopted both highside and lowside Nchannel MOSFET forsynchronous rectification op...

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AN1547: Features: 1. Switching frequency can go as high as 300 kHz (150 kHz/300 kHz fixed frequency PWM operation for Maxim 797)2. Very low quiescent current. Typically 375 mA3. High efficiency; can achiev...

AN1547 Data Sheet

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Part Number:
AN1547
Supply Ability:
5000

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Product Details

Description



Features:

1. Switching frequency can go as high as 300 kHz
    (150 kHz/300 kHz fixed frequency PWM operation for Maxim 797)
2. Very low quiescent current. Typically 375 mA
3. High efficiency; can achieve as high as 96%
4. Adopted both highside and lowside Nchannel
    MOSFET for synchronous rectification operation. This
    will reduce losses by using Pchannel for high side configuration.
5. High sink/source triggering current. Typically 1A
6. Small outline and low profile surface mount package. Ideal
   for notebook computers. (Refer to the Maxim 797 data sheet for detailed information)


Description

Synchronous Rectification is possible with all commonly used converter topologies. AN1547 is achieved by simply replacing the freewheeling diode with a MOSFET utilizing an additional gate drive circuit. As a result of this replacement, the efficiency will improve significantly.

Efficiency of 92% and higher can be achieved by using very low onresistance MOSFETs at a lower frequency if size is not a constraint to the design. At a higher switching frequency, a fast switching gate drive and low gate charge MOSFET is required to reduce losses. To further increase the efficiency of AN1547, use a low ESR capacitor for input and output filtering. In addition, reduce I2R losses by using a low dc losses inductor and increasing the PCB copper track width on the high current path.




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