LT3750 查看數據表（PDF） - Linear Technology

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LT3750

Capacitor Charger Controller

Linear Technology 

FEATURES

■ Charges Any Size Capacitor

■ Easily Adjustable Output Voltage

■ Drives High Current NMOS FETs

■ 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

U

APPLICATIO S

■ Emergency Warning Beacons

■ Professional Photoflash Systems

■ Security/Inventory Control Systems

■ High Voltage Power Supply

■ Electric Fences

■ Detonators

LT3750

Capacitor Charger

Controller

DESCRIPTIO

The LT®3750 is a flyback converter designed to rapidly

charge large capacitors to a user-adjustable target volt-

age. A patented boundary mode control scheme* mini-

mizes transition losses and reduces transformer size. The

transformer turns ratio and two external resistors easily

adjust the output voltage.* A low 78mV current sense

accurately limits peak switch current and also helps to

maximize efficiency. With a wide input voltage range, the

LT3750 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 LT3750 to the

user. The DONE pin indicates when the capacitor has

reached its programmed value and the part has stopped

charging.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

*Protected by U.S. Patents, including 6518733, 6636021.

TYPICAL APPLICATIO

300V, 6A Capacitor Charger

VTRANS

VCC

12V

10µF

10µF

VCC

100k

VTRANS

RVOUT

DONE

RDCM

LT3750

OFF ON CHARGE

GATE

T1 D1

1:10

56µF

×2

•+

•

60.4k

43k

M1

VOUT

300V

100µF

SOURCE

GND RBG

2.49k

12mΩ

100pF

3750 TA01a

6A Charge Time

300

VTRANS = 18V

250

200

VTRANS = 6V

VTRANS = 12V

150

100

50

0

0

0.1

0.2

0.3

0.4

0.5

TIME (SECONDS)

3750 TA03c

3750fa

1

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