UCC25701

高级电压模式脉宽调制器

The UCC35701/UCC35702 family of pulse width modulators is intended for isolated switching power supplies using primary side control. They can be used for both off-line applications and DC/DC converter designs such as in a distributed power system architecture or as a telecom power source.

The devices feature low startup current, allowing for efficient off-line starting, yet have sufficient output drive to switch power MOSFETs in excess of 500kHz.

Voltage feed forward compensation is operational over a 5:1 input range and provides fast and accurate response to input voltage changes over a 4:1 range. An accurate volt-second clamp and maximum duty cycle limit are also featured.

Fault protection is provided by pulse by pulse current limiting as well as the ability to latch off after a programmable number of repetitive faults has occurred.

Two UVLO options are offered. UCC35701 family has turn-on and turn-off thresholds of 13V/9V and UCC35702 family has thresholds of 9.6V/8.8V.

The UCC35701/2 and the /2 are offered in the 14 pin SOIC D, 14 pin PDIP N or in 14 pin TSSOP PW packages. The UCC15701/2 is offered in the 14 pin CDIP J package.

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700kHz Operation

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Integrated Oscillator/Voltage Feed Forward Compensation

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Accurate Duty Cycle Limit

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Accurate Volt-second Clamp

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Optocoupler Interface

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Fault Counting Shutdown

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Fault Latch off or Automatic Shutdown

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Soft Stop Optimized for Synchronous Rectification

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1A Peak Gate Drive Output

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130µA Start-up Current

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750µA Operating Current