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LT3751IUFD#TR

Description
Switching Voltage Regulators LT3751 - High Voltage Capacitor Charger Controller with Regulation
CategoryPower/power management    The power supply circuit   
File Size629KB,34 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LT3751IUFD#TR Overview

Switching Voltage Regulators LT3751 - High Voltage Capacitor Charger Controller with Regulation

LT3751IUFD#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionHVQCCN,
Reach Compliance Codecompliant
ECCN codeEAR99
Adjustable thresholdYES
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeR-PQCC-N20
JESD-609 codee0
length5 mm
Humidity sensitivity level1
Number of channels1
Number of functions1
Number of terminals20
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Package shapeRECTANGULAR
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
Maximum supply voltage (Vsup)24 V
Minimum supply voltage (Vsup)4.75 V
Nominal supply voltage (Vsup)5 V
surface mountYES
Temperature levelAUTOMOTIVE
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature20
width4 mm
LT3751
High Voltage Capacitor
Charger Controller with Regulation
FEATURES
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DESCRIPTION
The
LT
®
3751
is a high input voltage capable flyback con-
troller designed to rapidly charge a large capacitor to a
user-adjustable high target voltage set by the transformer
turns ratio and three external resistors. Optionally, a feed-
back pin can be used to provide a low noise high voltage
regulated output.
The LT3751 has an integrated rail-to-rail MOSFET gate
driver that allows for efficient operation down to 4.75V.
A low 106mV differential current sense threshold volt-
age accurately limits the peak switch current. Added pro-
tection is provided via user-selectable overvoltage and
undervoltage lockouts for both V
CC
and V
TRANS
. A typical
application can charge a 1000µF capacitor to 500V in less
than one second.
The CHARGE pin is used to initiate a new charge cycle
and provides ON/OFF control. The
DONE
pin indicates
when the capacitor has reached its programmed value and
the part has stopped charging. The
FAULT
pin indicates
when the LT3751 has shut down due to either V
CC
or
V
TRANS
voltage exceeding the user-programmed supply
tolerances.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 6518733 and 6636021.
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Charges Any Size Capacitor
Low Noise Output in Voltage Regulation Mode
Stable Operation Under a No-Load Condition
Integrated 2A MOSFET Gate Driver with Rail-to-Rail
Operation for V
CC
≤ 8V
Selectable 5.6V or 10.5V Internal Gate Drive
Voltage Clamp
User-Selectable Over/Undervoltage Detect
Easily Adjustable Output Voltage
Primary or Secondary Side Output Voltage Sense
Wide Input V
CC
Voltage Range (5V to 24V)
Available in 20-Pin QFN 4mm × 5mm and 20-Lead
TSSOP Packages
APPLICATIONS
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High Voltage Regulated Supply
High Voltage Capacitor Charger
Professional Photoflash Systems
Emergency Strobe
Security/Inventory Control Systems
Detonators
TYPICAL APPLICATION
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
V
TRANS
24V
T1
1:10
330µF
×2
40.2k
RV
TRANS
RDCM
CHARGE
CLAMP
RV
OUT
V
CC
LT3751
HVGATE
LVGATE
CSP
CSN
FB
RBG
732
3751 TA01a
D1
Load Regulation and Efficiency
500V
0 TO 150mA
+
500
90
10µF
×2
18.2k
40.2k
+
0.47µF
100µF
498
OUTPUT VOLTAGE (V)
84
EFFICIENCY (%)
OFF ON
V
CC
24V
496
78
TO
DONE
MICRO
FAULT
374k
UVLO1
V
TRANS
475k
OVLO1
374k
UVLO2
V
CC
475k
OVLO2
GND
10µF
V
CC
6m
715k
494
72
492
OUTPUT VOLTAGE
EFFICIENCY
0
50
100
LOAD CURRENT (mA)
66
10nF
1.74k
490
60
150
3751 TA01b
3751fd
For more information
www.linear.com/LT3751
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