LT3750A Datasheet | Analog Devices

FEATURES n Charges Any Size Capacitor n Easily Adjustable Output Voltage n Drives High Current NMOS FETs n Primary-Side Sense- No Output Voltage Divider Necessary n Wide Input Range: 3V to 24V n Drives Gate to VCC - 2V n Available in 10-Lead MS Package APPLICATIONS n Emergency Warning Beacons n Professional Photoflash Systems n Security/Inventory Control Systems n High Voltage Power Supply n Electric Fences n Detonators DESCRIPTION The LT®3750A is a flyback converter designed to rapidly charge large capacitors to a user-adjustable target volt­ age. A patented boundary mode control scheme- minimizes transition losses and reduces transformer size. The transformer turns ratio and two external resistors easily adjust the output voltage.- A low 78m V current sense accurately limits peak switch current and also helps to maximize efficiency. With a wide input voltage range, the LT3750A can operate from a variety of power sources. A typical application can charge a 100µF capacitor to 300V in less than 300ms. The CHARGE pin gives full control of the LT3750A to the user. The DONE pin indicates when the capacitor has reached its programmed value and the part has stopped charging. All registered trademarks and trademarks are the property of their respective owners. - Protected by U.S. patents, including 6518733, 6636021. TYPICAL APPLICATION 300V, 6A Capacitor Charger VTRANS VCC 12V 10µF 10µF VCC 100k VTRANS RVOUT DONE RDCM OFF ON CHARGE GATE T1 D1 1:10 56µF ×2 - + 60.4k - 43k M1 VOUT 300V 100µF SOURCE GND RBG 2.49k 12mΩ 100p F 3750a TA01a VOUT (V) 6A Charge Time 300 VTRANS = 18V VTRANS = 6V VTRANS =...