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LTC3705

Features: · High-Speed Top and Bottom Gate Drivers for 2-Switch Forward Converter· On-Chip Rectifier and Self-Starting Architecture Eliminate Need for Separate Gate Drive Bias Supply· Wide Input Voltage Supply Range: 18V to 80V· Tolerant of 100V Input Voltage Transients· Linear Regulator Controlle...

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SeekIC No. : 004402301 Detail

LTC3705: Features: · High-Speed Top and Bottom Gate Drivers for 2-Switch Forward Converter· On-Chip Rectifier and Self-Starting Architecture Eliminate Need for Separate Gate Drive Bias Supply· Wide Input Vol...

LTC3705 Data Sheet

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Part Number:
LTC3705
Supply Ability:
5000

Price Break

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

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Product Details

Description



Features:

· High-Speed Top and Bottom Gate Drivers for 2-Switch Forward Converter
· On-Chip Rectifier and Self-Starting Architecture Eliminate Need for Separate Gate Drive Bias Supply
· Wide Input Voltage Supply Range: 18V to 80V
· Tolerant of 100V Input Voltage Transients
· Linear Regulator Controller for Fast Start-Up
· Precision UVLO with Adjustable Hysteresis
· Overcurrent Protection
· Volt-Second Limit Prevents Transformer Core Saturation
· Voltage Feedforward for Fast Transient Response
· Available in 16-Lead Narrow SSOP Package


Application

· Isolated 48V Telecommunication Systems
· Internet Servers and Routers
·Distributed Power Step-Down Converters
· Automotive and Heavy Equipment


Pinout

Connection Diagram


Specifications

Power Supply (VCC) ...................................0.3V to 15V
External NMOS Drive (NDRV) ....................0.3V to 20V
NDRV to VCC .............................................. 0.3V to 5V
Bootstrap Supply (BOOST) ......................0.3V to 115V
Top Source (TS) .......................................... -5V to 100V
BOOST to TS .............................................0.3V to 15V
Soft-Start Fault, Feedback,
Frequency Set, Transformer
Inputs (SSFLT, FB/IN+, FS/IN ) ................0.3V to 15V
All Other Pins (VSLMT, IS, UVLO) .................0.3V to 5V
Peak Output Current <1s (TG, BG) ........................... 2A
Operating Ambient Temperature Range 40°C to 85°C
Operating Junction Temperature (Note 2) ............ 125°C
Storage Temperature Range ............... 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C


Description

The LTC®3705 is a controller for a 2-switch forward converter and includes on-chip bottom and top gate drivers that do not require external transformers.

For secondary-side control, combine the LTC3705 with the LTC3706 PolyPhase® secondary-side synchronous forward controller to create a complete forward converter using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals across the isolation barrier through a tiny pulse transformer. The on-chip rectifier and the same pulse transformer provide gate drive bias power.

Alternatively, the LTC3705 can be used as a standalone voltage mode controller in a primary-side control architecture with optoisolator feedback. Voltage feedforward provides excellent line regulation and transient response.




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