Flyback Controller charges capacitors of any size.
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Press Release Summary:
Model LT3750 is designed to charge capacitors to voltages up to 1,000 V. It drives external N-Channel MOSFET and can charge 100 µF capacitor to 300 V in less than 300 ms. Controller offers input voltage of 3-24 V, boundary mode control scheme, and 78 mV current sense that limits peak switch current. LT3750's primary-side sensing topology eliminates need for external output voltage divider. Its DONE pin indicates that capacitor has reached programmed value and has stopped charging.
Original Press Release:
LT3750: Charger Controller Charges Any Size Capacitor
Milpitas, California, (February 16, 2006)
MILPITAS, CA - February 16, 2006 - Linear Technology Corporation announces the LT3750, a flyback controller designed to rapidly charge large capacitors to voltages as high as 1,000V. The LT3750 drives an external high current N-Channel MOSFET and can charge a 100uF capacitor to 300V in less than 300ms making it ideal for applications such as professional photoflash systems, RF security, inventory control systems and specialized high voltage power supplies. Its input voltage range of 3V to 24V enables it to operate from a variety of power sources and its patented boundary mode control scheme minimizes transition losses and reduces transformer size. Packaged in a tiny MSOP-10, it provides a very compact high voltage/current capacitor charger solution.
The LT3750's primary-side sensing topology eliminates the need for an external output voltage divider. It uses a single high current N-Channel MOSFET and delivers charging efficiencies above 90%. A low 78mV current sense accurately limits peak switch current while optimizing efficiency. Output voltages can be easily adjusted using the transformer turns ratio and two external resistors. Additional features include a charge pin, offering full control of the LT3750 to the user and a DONE pin that indicates when the capacitor has reached its programmed value and has stopped charging.
The LT3750EMS is available from stock in a 10-Lead MSOP-10 package. 1,000-piece pricing starts at $3.50 each
Summary of Features: LT3750EMS
Charges Any Size Capacitor
Easily Adjustable Output Voltage
Drives High Current N-Channel MOSFETs
Primary-Side Sense - No Output Voltage Divider Necessary
Wide Input Range: 3V to 24V
Drives Gate to VCC - 2V
Available in 10-Lead MS Package
Media Contact
Name: Doug Dickinson
Title: Media Relations Manager
Tel: 408-432-1900 ext. 2233
E-mail: ddickinson@linear.com
