Datasheet LT3751 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | High Voltage Capacitor Charger Controller with Regulation |
| Pages / Page | 34 / 1 — FEATURES. DESCRIPTION. Charges Any Size Capacitor. Low Noise Output in … |
| File Format / Size | PDF / 651 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Charges Any Size Capacitor. Low Noise Output in Voltage Regulation Mode
Model Line for this Datasheet
Text Version of Document
LT3751 High Voltage Capacitor Charger Controller with Regulation
FEATURES DESCRIPTION
n
Charges Any Size Capacitor
The LT®3751 is a high input voltage capable flyback con- n
Low Noise Output in Voltage Regulation Mode
troller designed to rapidly charge a large capacitor to a n
Stable Operation Under a No-Load Condition
user-adjustable high target voltage set by the transformer n
Integrated 2A MOSFET Gate Driver with Rail-to-Rail
turns ratio and three external resistors. Optionally, a feed-
Operation for VCC ≤ 8V
back pin can be used to provide a low noise high voltage n
Selectable 5.6V or 10.5V Internal Gate Drive
regulated output.
Voltage Clamp
The LT3751 has an integrated rail-to-rail MOSFET gate n
User-Selectable Over/Undervoltage Detect
driver that allows for efficient operation down to 4.75V. n Easily Adjustable Output Voltage A low 106mV differential current sense threshold volt- n Primary or Secondary Side Output Voltage Sense age accurately limits the peak switch current. Added pro- n Wide Input VCC Voltage Range (5V to 24V) tection is provided via user-selectable overvoltage and n Available in 20-Pin QFN 4mm × 5mm and 20-Lead undervoltage lockouts for both VCC and VTRANS. A typical TSSOP Packages application can charge a 1000µF capacitor to 500V in less than one second.
APPLICATIONS
The CHARGE pin is used to initiate a new charge cycle n and provides ON/OFF control. The DONE pin indicates High Voltage Regulated Supply n when the capacitor has reached its programmed value and High Voltage Capacitor Charger n the part has stopped charging. The FAULT pin indicates Professional Photoflash Systems n when the LT3751 has shut down due to either V Emergency Strobe CC or n V Security/Inventory Control Systems TRANS voltage exceeding the user-programmed supply n tolerances. Detonators All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 6518733 and 6636021.
TYPICAL APPLICATION DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY Load Regulation and Efficiency
T1 V 1:10 D1 TRANS 500V 500 90 24V + 0 TO 150mA 330µF 10µF 40.2k ×2 ×2 • + 100µF 498 84 RV • TRANS 18.2k 0.47µF OFF ON CHARGE RDCM EFFICIENCY (%) CLAMP 40.2k RVOUT V 496 78 CC VCC 24V LT3751 TAGE (V) 10µF TO DONE HVGATE MICRO FAULT LVGATE VCC CSP 494 72 374k UVLO1 V 6mΩ TRANS 475k OUTPUT VOL OVLO1 CSN 715k 374k 492 66 UVLO2 V FB OUTPUT VOLTAGE CC 475k OVLO2 EFFICIENCY 1.74k GND RBG 10nF 490 60 0 50 100 150 732Ω LOAD CURRENT (mA) 3751 TA01b 3751 TA01a 3751fd For more information www.linear.com/LT3751 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Charges Any Size Capacitor
The LT®3751 is a high input voltage capable flyback con- n
Low Noise Output in Voltage Regulation Mode
troller designed to rapidly charge a large capacitor to a n
Stable Operation Under a No-Load Condition
user-adjustable high target voltage set by the transformer n
Integrated 2A MOSFET Gate Driver with Rail-to-Rail
turns ratio and three external resistors. Optionally, a feed-
Operation for VCC ≤ 8V
back pin can be used to provide a low noise high voltage n
Selectable 5.6V or 10.5V Internal Gate Drive
regulated output.
Voltage Clamp
The LT3751 has an integrated rail-to-rail MOSFET gate n
User-Selectable Over/Undervoltage Detect
driver that allows for efficient operation down to 4.75V. n Easily Adjustable Output Voltage A low 106mV differential current sense threshold volt- n Primary or Secondary Side Output Voltage Sense age accurately limits the peak switch current. Added pro- n Wide Input VCC Voltage Range (5V to 24V) tection is provided via user-selectable overvoltage and n Available in 20-Pin QFN 4mm × 5mm and 20-Lead undervoltage lockouts for both VCC and VTRANS. A typical TSSOP Packages application can charge a 1000µF capacitor to 500V in less than one second.
APPLICATIONS
The CHARGE pin is used to initiate a new charge cycle n and provides ON/OFF control. The DONE pin indicates High Voltage Regulated Supply n when the capacitor has reached its programmed value and High Voltage Capacitor Charger n the part has stopped charging. The FAULT pin indicates Professional Photoflash Systems n when the LT3751 has shut down due to either V Emergency Strobe CC or n V Security/Inventory Control Systems TRANS voltage exceeding the user-programmed supply n tolerances. Detonators All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 6518733 and 6636021.
TYPICAL APPLICATION DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY Load Regulation and Efficiency
T1 V 1:10 D1 TRANS 500V 500 90 24V + 0 TO 150mA 330µF 10µF 40.2k ×2 ×2 • + 100µF 498 84 RV • TRANS 18.2k 0.47µF OFF ON CHARGE RDCM EFFICIENCY (%) CLAMP 40.2k RVOUT V 496 78 CC VCC 24V LT3751 TAGE (V) 10µF TO DONE HVGATE MICRO FAULT LVGATE VCC CSP 494 72 374k UVLO1 V 6mΩ TRANS 475k OUTPUT VOL OVLO1 CSN 715k 374k 492 66 UVLO2 V FB OUTPUT VOLTAGE CC 475k OVLO2 EFFICIENCY 1.74k GND RBG 10nF 490 60 0 50 100 150 732Ω LOAD CURRENT (mA) 3751 TA01b 3751 TA01a 3751fd For more information www.linear.com/LT3751 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
