Analog Devices LT3752EFE-1/ LT8311EFE | Demoboard DC1929A

Description

Demonstration circuit 1929A is a 200W active clamp forward converter featuring the LT®3752-1/LT8311 chipset.It operates at about 100kHz and produces a regulated 12V output from an input voltage ranging from 150V to 400V,making it well suited for automotive, industrial, and other applications. Table 1 summarizes the performance of the demo board.

The LT3752-1 is a current mode PWM controller optimized for a forward converter with high-side active clamp transformer reset. An accurate, programmable volt-second clamp allows primary switch duty cycles above 50% for better utilization of switch, transformer and rectifier. The AOUT gate driver can be used to drive a gate transformer, level-shift driver, or opto-coupler driver for the high-side N-channel FET. The SOUT controls the secondary side synchronous rectification. The integrated housekeepingflyback controller brings great convenience for both primary and secondary bias circuits. During its soft-start and soft-stop, LT3752-1 folds back witching frequency and duty-ratio clamp, thus reduces the electrical stressesover the output inductor, and transformer.

The LT3752-1 features a set of safety protections including undervoltage, overvoltage and overcurrent protections. Its precise overcurrent protection allows for continuous reliable operation under short-circuit conditions. The LT8311 controls the secondary side synchronous rectification, with enhanced regulation of the output voltage during startup,shutdown or recovery from a fault.

The LT3752-1 and LT8311 data sheets give complete descriptions of the parts, operation and application information. The data sheet must be read in conjunction with this quick start guide for Demo Circuit 1929A.

Features

RemarksL1=15uHL2=4.7uH

More information

• Datasheet
• IC product information