100V Isolated Monolithic No-Opto Flyback Regulator Delivers up to 24W

MILPITAS, CA --- Linear Technology Corporation announces the LT8304, a monolithic flyback regulator that significantly simplifies the design of isolated DC/DC converters. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no opto-isolator or third winding for regulation. The LT8304 operates over a 3V to 100V input voltage range, has a 2A/150V integrated DMOS power switch and delivers up to 24 watts of output power, making it well suited for a wide variety of telecom, datacom, automotive, industrial, medical and military applications.

The LT8304 operates in boundary mode, which is a variable frequency current mode control switching scheme, typically resulting in ±5% output voltage regulation over the full line, load and temperature range. Boundary mode enables the use of a smaller transformer compared to equivalent continuous conduction-mode designs. The output voltage is easily set by two external resistors and the transformer turns ratio. Several off-the-shelf transformers, identified in the data sheet, can be used for numerous applications. The high level of integration and the use of low ripple Burst Mode® operation result in a simple to use, low component count and high efficiency solution for isolated power delivery.

Additional features include output short-circuit protection, 116µA no load operating quiescent current, accurate enable and undervoltage lockout with hysteresis, internal soft start and loop compensation, along with output diode temperature compensation.

Summary of Features: LT8304

VIN Range from 3V to 100V
Up to 24 Watts of Output Power
Onboard 2A, 150V Integrated DMOS Power Switch
Off-the-Shelf Power Transformers
No Opto-Isolator or Transformer Third Winding Required for Voltage Feedback
116µA Quiescent Current
Boundary Mode Operation
VOUT Set with Two External Resistors
Accurate Input Enable & Undervoltage Lockout with Hysteresis
Output Diode Temperature Compensation
Extended & Industrial Grades:
-40°C to 125°C Operating Junction Temp

The LT8304 is available in a small thermally enhanced SO-8 package. Extended and industrial versions operate over a junction temperature range of -40°C to 125°C. Pricing starts at $3.55 each in 1000-piece quantities.

For more information, visit http://www.linear.com/product/LT8304
 

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