UCC3570N

TEXAS INSTRUMENTS  UCC3570N  低功率控制器, PWM, 13V-10V电源, 500 kHz, 400mV/1A输出, DIP-14

The is a Pulse Width Modulation PWM Controller intended for application in isolated switching supplies using primary side control and a voltage mode feedback loop. Made with a BiCMOS process, these devices feature low startup current for efficient off-line starting with a bootstrapped low voltage supply. Operating current is also very low; yet these devices maintain the ability to drive a power MOSFET gate at frequencies above 500kHz. Voltage feed forward provides fast and accurate response to wide line voltage variation without the noise sensitivity of current-mode control. Fast current limiting is included with the ability to latch off after a programmable number of repetitive faults have occurred. This allows the power supply to ride through a temporary overload, while still shutting down in the event of a permanent fault.

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Voltage feed forward compensation

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Programmable duty cycle clamp

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Optocoupler interface

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Soft-start

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Fault counting shutdown

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Fault latch off or automatic restart

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85uA Start-up current

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1mA Run current

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1A Peak gate drive output