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LT3751 Capacitor Charger Controller: Datasheet, Pinout, Applications [FAQ]

Author: Irene
Date: 24 Jan 2022
 403
LT3751 Pinout

Product Overview

The LT3751 is a high input voltage capable flyback controller 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 feedback pin can be used to provide a low noise high voltage regulated output.

 

This blog will introduce LT3751 systematically from its features, pinout to its specifications, applications, also including LT3751 datasheet and so much more.

 

Catalog

Product Overview

LT3751 Features

LT3751 Pinout

LT3751 Applications

LT3751 Block Diagram

LT3751 Typical Applications

LT3751 Specification

How does LT3751 work

LT3751 Manufacturer

LT3751 Datasheet

Using Warnings

LT3751 FAQ

 

LT3751 Features

  • 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-RailOperation for VCC ≤ 8V
  • Selectable 5.6V or 10.5V Internal Gate DriveVoltage Clamp
  • User-Selectable Over/Undervoltage Detect
  • Easily Adjustable Output Voltage
  • Primary or Secondary Side Output Voltage Sense
  • Wide Input VCC Voltage Range (5V to 24V)
  • Available in 20-Pin QFN 4mm × 5mm and 20-LeadTSSOP Packages

 

LT3751 Pinout

The following figure is the diagram of LT3751 pinout.

 

LT3751 Pinout1

LT3751 Pinout1

 

LT3751 Pinout2

LT3751 Pinout2

 

LT3751 Applications

  • High Voltage Regulated Supply
  • High Voltage Capacitor Charger
  • Professional Photoflash Systems
  • Emergency Strobe
  • Security/Inventory Control Systems
  • Detonators

 

LT3751 Block Diagram

The following figure shows the block diagram of LT3751.

 

LT3751 Block Diagram

LT3751 Block Diagram

 

LT3751 Typical Applications

The following figures shows the typical applications of LT3751, which shows the compact solution dimensions.

 

LT3751 Typical Applications

LT3751 Typical Applications

 

Load Regulation and Efficiency

Load Regulation and Efficiency

 

LT3751 Specification

Brand Name: Linear Technology
Length: 5 mm
Width: 4 mm
Operating Temperature-Max: 125 °C
Operating Temperature-Min: -40 °C
Peak Reflow Temperature (Cel): 235
Seated Height-Max: 0.8 mm
Supply Current-Max (Isup): 8 mA
Supply Voltage-Max (Vsup): 24 V
Supply Voltage-Min (Vsup): 4.75 V
Supply Voltage-Nom (Vsup): 5 V
Time@Peak Reflow Temperature-Max (s): 20

 

How does LT3751 work

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 voltage accurately limits the peak switch current. Added protection is provided via user-selectable overvoltage and undervoltage lockouts for both VCC and VTRANS. 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 VCC or VTRANS voltage exceeding the user-programmed supply tolerances.

 

LT3751 Manufacturer

Linear Technology and Analog Devices have joined together. Analog Devices is a world leader in the design, manufacture, and marketing of a broad portfolio of high performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) used in virtually all types of electronic equipment.

 

LT3751 Datasheet

You can download this datasheet for LT3751–Datasheet from the link given below:

LT3751 Datasheet

 

Using Warnings

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

LT3751 FAQ

Is the lt3751 a high voltage capacitor controller?

The LT3751 is a high input voltage capable flyback controller 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 feedback pin can be used to provide a low noise high voltage regulated output.

 

What does the fault pin on the lt3751 mean?

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. At least one model within this product family is in production and available for purchase.

 

What is a capacitor controller?

The capacitor bank controller CQ is the complete solution for controlling and monitoring capacitors on distribution systems. CQ controller is available in two different models: CQ900 can automatically monitor and switch capacitor banks based on real time network conditions.

 

What does a capacitor do to the voltage?

When used in a direct current or DC circuit, a capacitor charges up to its supply voltage but blocks the flow of current through it because the dielectric of a capacitor is non-conductive and basically an insulator.

 

How much time is required to discharge the capacitor?

Note that as the decaying curve for a RC discharging circuit is exponential, for all practical purposes, after five time constants the voltage across the capacitor's plates is much less than 1% of its inital starting value, so the capacitor is considered to be fully discharged.

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