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Send til en ven   Udskriv27/5 2011 kl. 14:47
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Flyback controller med udvidet junction temperaturområde

Linear Technology er klar med flyback controller med et bred indgangsspændings-område, der er specificeret i junctiontemperaturområde fra -55°C til 150°C (in english). 

Linear Technology announces the high reliability (MP-grade) version of the LTC3805/-5, a programmable frequency flyback controller that operates over a -55°C to 150°C junction temperature range.

This high-performance shunt regulated input voltage PWM (pulse width modulation) controller enables for wide input voltages ranging from 5V to off-line applications and is ideal for users requiring one power supply for both 48V and 24V nominal input systems.

The LTC3805/-5 has a current-mode control architecture that provides excellent transient response and cycle-by-cycle current limit while simplifying feedback loop stability. Fixed frequency operation is from 70kHz to 700kHz and can be synchronized to an external clock.


The low start-up (40µA) and operating currents (360µA) minimize power loss and improve efficiency. Its low 100mV current-limit threshold further reduces power loss. Additional features include adjustable soft start, programmable slope compensation, remote on/off and overvoltage protection. The LTC3805MP-5 features a lower turn-on voltage of 4.5V versus 8.4V for the LTC3805MP.

The LTC3805MP/-5 versions are available from stock in the thermally enhanced MSOP-10 package. Pricing starts at $4.76 each for 1,000 piece quantities. www.linear.com/product/LTC3805.

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