Linear Technology Corp. has introduced a high-input voltage-capable synchronous forward controller, the LT3752/LT3752-1. This controller is designed with an active clamp transformer reset and has an integrated housekeeping controller to bias the primary and secondary ICs which maintains a controlled VOUT start-up and shut-down. The internal bias generation drastically reduces the complexity and size of main power transformers by avoiding the need for extra windings to create bias supplies.

The LT3752 operates over a wide range of input voltages, from 6.5-to-100-V. It is capable of handling hybrid vehicle (HV) and hybrid electric vehicle (HEV) applications in the LT3752-1 model. The LT3752-1 can handle inputs up to 400 V with RC start-up from the input voltage, limited only by the choice of external components.

Obtaining a 5% output voltage regulation is possible without using an optocoupler. If an optocoupler is used, 1.5% output voltage regulation can be attained. The LT3752/-1 uses a pulse transformer to send a control signal to a secondary-side MOSFET driver for synchronous rectification timing. It can also be used in self-driven applications, with the power transformer pulsing controlling the secondary-side MOSFETs.

The LT3752/-1 also allows startups at 0 V output voltage, eliminating the need for startup circuitry for secondary-side ICs, enabling a controlled VOUT start-up.

With a programmable 100-to-500-kHz operating switching frequency, the LT3752/-1 can be synchronized to an external clock. This allows a range of output inductor values and transformer sizes to be used.

The LT3752/-1 is available in a TSSOP-38 package with several pins removed for high-voltage spacing. Its E- and I-grade versions function from a 40C-to-125C junction temperature while the H-grade functions from a 40C-to-150C operating junction temperature. The LT3752/-1 MP-grade functions from 55C-to-150C operating junction temperature.

Linear Technology Corp. is a well-known manufacturer of high-performance analog integrated circuits. They produce a wide range of products such as voltage regulators, data converters, and audio amplifiers, among others. Their products are used in many different applications, including automotive, industrial, communications, and healthcare.

Feilisheng (Hong Kong) Electronics Co., Ltd. is a professional integrated circuit supplier that has been committed to the promotion and sales of world-famous electronic products in China. They specialize in component sales, technical consultation, and information services, providing high-quality products and services to their customers.

With the introduction of the LT3752/LT3752-1, Linear Technology Corp. has once again proven their commitment to innovation and providing reliable solutions to their customers. This new product is set to make a significant impact in the field of high-input voltage-capable synchronous forward controllers for a range of applications.