Home

LTC3806| Datasheet

By datasheet - November 4th, 2008

LTC3806| Datasheet

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)


LTC3806 Synchronous Flyback DC/DC Controller

FEATURES

DESCRIPTIO

High Efficiency at Full Load Better Cross Regulation Than Nonsynchronous Converters (Multiple Outputs) Soft-Start Minimizes Inrush Current Current Mode Control Provides Excellent Transient Response High Maximum Duty Cycle: 89% Typical 2% Programmable Undervoltage Lockout Threshold 1% Internal Voltage Reference Micropower Start-Up Constant Frequency Operation (Never Audible) 3mm 4mm 12-Pin DFN Package

The LTC 3806 is a current mode synchronous flyback controller that drives N-channel power MOSFETs and requires very few external components. It is intended for medium power applications where multiple outputs are required. Synchronous rectification provides higher efficiency and improved output cross regulation than nonsynchronous converters. The IC contains all the necessary control circuitry including a 250kHz oscillator, precision undervoltage lockout circuit with hysteresis, gate drivers for primary and synchronous switches, current mode control circuitry and soft-start circuitry. Programmable soft-start reduces inrush currents. This makes it easier to design compliant Power Over Ethernet supplies. Low start-up current reduces power dissipation in the start-up resistor and reduces the size of the external startup capacitor. The LTC3806 is available in a 12-pin, exposed pad DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

APPLICATIO S

48V Telecom Supplies 12V/42V Automotive 24V Industrial VoIP Phone Power Over Ethernet

TYPICAL APPLICATIO
VIN 36V TO 72V R1 51k R2 604k

C7 4.7F LTC3806 RUN SENSE R8 100 ITH FB VIN C1 100F R3 26.7k C2 1nF R4 3.4k INTVCC C3 4.7F SS G2 G1 GND

D1

T1

M1

M2

C4 0.47F

R5 0.056

R7 12.4k

R6 21k

Figure 1. Multiple Output Flyback Converter for Telecom
3806fb

U
VOUT1 3.3V VOUT2 3A 2.5V 3A M3 C5 470F C6 470F
3806 F01

U

U

1


LTC3806 Datasheet linear Download PDF

Add this permalink to your bookmarks for future download of LTC3806 datasheet

Permalink: http://datasheet.emcelettronica.com/linear/LTC3806