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LT3750_15

Description
Capacitor Charger Controller
File Size202KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LT3750_15 Overview

Capacitor Charger Controller

LT3750
Capacitor Charger
Controller
FEATURES
DESCRIPTIO
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 V
CC
– 2V
Available in 10-Lead MS Package
APPLICATIO S
Emergency Warning Beacons
Professional Photoflash Systems
Security/Inventory Control Systems
High Voltage Power Supply
Electric Fences
Detonators
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
V
TRANS
10µF
300V, 6A Capacitor Charger
T1
1:10
56µF
×2
D1
V
OUT
300V
+
100µF
300
V
TRANS
= 18V
250
V
TRANS
= 6V
200
V
OUT
(V)
150
100
V
CC
12V
10µF
100k
V
CC
DONE
V
TRANS
RV
OUT
RDCM
LT3750
GATE
SOURCE
60.4k
43k
OFF ON
CHARGE
M1
GND
RBG
12mΩ
2.49k
100pF
3750 TA01a
50
0
0
0.1
0.2
0.3
TIME (SECONDS)
0.4
0.5
3750 TA03c
U
6A Charge Time
V
TRANS
= 12V
3750fa
U
U
1
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