LT3837EFE#PBF

LT3837 is an isolated switching regulator controller designed for medium power flyback topologies. A typical application is 10W to 60W with the part powered from a DC supply. It is a current mode controller that regulates an output voltage based on sensing the secondary voltage via a transformer winding during flyback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectification increases converter efficiency and improves output cross regulation in multiple output converters. It 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 circuitry. It is used in application such as instrumentation power supplies, isolated medical supplies etc.

• Synchronous driver for high efficiency
• Supply voltage range is 4.5V to 20V
• Accurate regulation without user trims
• Synchronizable, load compensation
• Undervoltage lockout
• Supply current is 6.4mA typical
• Shutdown current is 50µA typical
• Switching frequency is 100KHz typical at (COSC = 100pF)
• Operating junction temperature is -40°C to 125°C
• Package style is 16-lead plastic TSSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party