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LT3825

Features: ` Senses Output Voltage Directly from Primary Side Winding-No Optoisolator Required` Synchronous Driver for High Effi ciency` Input Voltage Limited Only by External Power Components` Accurate Output Regulation Without User Trims` Switching Frequency from 50kHz to 250kHz` Synchroniz...

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SeekIC No. : 004401159 Detail

LT3825: Features: ` Senses Output Voltage Directly from Primary Side Winding-No Optoisolator Required` Synchronous Driver for High Effi ciency` Input Voltage Limited Only by External Power Components`...

LT3825 Data Sheet

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Part Number:
LT3825
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/5/31

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Product Details

Description



Features:

` Senses Output Voltage Directly from Primary Side Winding-No Optoisolator Required
` Synchronous Driver for High Effi ciency
` Input Voltage Limited Only by External Power Components
` Accurate Output Regulation Without User Trims
` Switching Frequency from 50kHz to 250kHz
` Synchronizable
` Load Compensation
` Programmable Undervoltage Lockout
` Available in a Thermally Enhanced 16-Lead



Application

· Isolated Medium Power (10W to 60W) Supplies
· Isolated Telecom, Medical Converters
· Instrumentation Power Supplies
· Isolated Power over Ethernet Supplies



Pinout

Connection Diagram


Specifications

VCC to GND
   Low Impedance Source ......................... 0.3V to 18V
   Current Fed
   (VCC has Internal 19.5V Clamp) ............30mA into VCC
UVLO, SYNC Pin Voltage ............................ 0.3V to VCC
SENSE, SENSE+ Pin Voltage ................... 0.5V, +0.5V
FB Pin Current ........................................................±2mA
VC Pin Current ....................................................... ±1mA
Operating Junction Temperature Range
(Notes 2, 3) ............................................. .40 to 125
Storage Temperature Range ..................... 65to 150
Lead Temperature (Soldering, 10 sec) ..................... 300


Description

The LT®3825 is an isolated switching regulator controller designed for medium power fl yback topologies. A typical application is 10W to 60W with input voltage limited only by external power path components. A third transformer winding provides output voltage feedback.

The LT3825 is a current mode controller that regulates output voltage based on sensing secondary voltage via a transformer winding during fl yback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectifi cation increases converter effi ciency and improves
output cross regulation in multiple output converters.

The LT3825 operates in forced continuous conduction mode which improves cross regulation in multiple winding applications. Switching frequency is user programmable and can be externally synchronized. The part also has load compensation, undervoltage lockout and soft-start circuity.




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