Features

• Secondary-Side Control for Fast Transient Response
• Self-Starting Architecture Eliminates Need for Separate Bias Regulator
• Proprietary Gate Drive Encoding Scheme Reduces System Complexity
• PolyPhase® Operation Reduces C_IN Requirements
• Current Mode Control Ensures Current Sharing
• PLL Fixed Frequency: 100kHz to 500kHz
• ±1% Output Voltage Accuracy
• True Remote Sense Differential Amplifier
• Power Good Output Voltage Monitor
• High Voltage Linear Regulator Controller
• Wide Supply Range: 5V to 30V
• Available in a Narrow 24-Lead SSOP Package

Typical Application

Description

The LTC3706 is a PolyPhase capable secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705 gate driver and primary-side controller, the part creates a complete isolated power supply that combines the power of PolyPhase operation with the speed of secondary-side control.

The LTC3706 has been designed to simplify the design of highly efficient, secondary-side forward converters. Working in concert with the LTC3705, the LTC3706 forms a robust, self-starting converter that eliminates the need for the separate bias regulator that is commonly used in secondary-side control applications. In addition, a proprietary scheme is used to multiplex gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer.

The LTC3706 provides remote sensing, accurate power good and overvoltage monitoring circuits to support precision, high current applications. A linear regulator controller with thermal protection is also provided to simplify the generation of secondary-side bias voltage.

The LTC3706 is available in a 24-lead SSOP package.