For fast charging sources, it is generally the use of a separate primary controller with a secondary synchronous rectifier controller, and the secondary synchronous rectifier controller automatically detects the switch of the primary switch tube and automatically controls the switch of the synchronous rectifier. For higher power supplies, the internal LLC controller will output a synchronous rectification signal by the primary LLC controller, without the need for a secondary synchronous rectification controller, thereby obtaining higher efficiency.
We all know that the switching power supply is internally isolated at the primary level, and the output voltage is fed back by an optocoupler. For high-power switching power supplies, in order to reduce the primary loss, the controller is placed in the secondary stage and powered by the auxiliary power supply. This requires an isolated driver that amplifies the drive signal output by the controller to drive the primary MOS tube.
Usually the isolation device we are familiar with is optocoupler, optocoupler can indeed play a role in isolating communication, but there is no driver inside the optocoupler, which requires an external independent driver, which is more troublesome to use. Suzhou Nanochip has launched a high-reliability isolated dual-channel gate driver NSi6602, which supports half-bridge drive and can be used for LLC primary drive of high-power switching power supplies, realizing a streamlined and reliable isolated drive design.
Suzhou Nanocore Microelectronics Co., Ltd. is a research and development and design enterprise of high-performance and high-reliability analog chips. Since its establishment in 2013, Nanochip has focused on product development around various application scenarios, starting from the sensor signal conditioning ASIC chip, and expanding the integrated sensor chip, isolation and interface chip, driver and sampling chip to the front and back end, forming a product layout of signal perception, system interconnection and power drive.
Nanochip micro has independent intellectual property rights and rich technical reserves in the fields of mixed signal processing, high-withstand voltage digital isolation, integrated sensor design, etc., and its products have been used as key chips for new energy vehicles, industrial automation and other applications, and have successfully entered the supply system of first-line customers in many industries and achieved large-scale mass production. At the same time, the company continues to increase product research and development in various application scenarios, and the products are widely used in domestic well-known brand customers, covering information and communications, industrial control, automotive electronics and consumer electronics.
On the Xingu Kunlun 650W gold medal full-mode SFX power supply, the nano-core micro NSi6602 is used to isolate the drive signal output of the LLC controller and drive two LLC switch tubes, and the chip has a built-in driver that can directly drive the MOS tube without the need for an external driver. Simplify switching power supply primary circuit design while increasing efficiency.
Nanochip MicroNSi6602 is a highly reliable dual-channel isolated gate driver chip that supports 2MHz switching frequency applications. Offering 5000Vrms isolation, the built-in driver supports 4A sink and 6A pull outputs with a typical propagation delay of 19ns and maximum delay matching of 5ns.
The NSi6602 driver stage supports 28V supply voltage, and the input side supports 2.7-5.5V supply voltage, matching 3.3 and 5V supply controllers. Dead time support programming, minimum input pulse width of 20ns, support -40°C ~ 125°C operating temperature, available in LGA13, SOIC14 wide body and SOIC16 wide body packages, and available in automotive grade products.
NSi6602 supports isolated power supply applications of servers, communication power supplies and industrial power supplies, supports new energy inverter applications, supports motor drives and new energy vehicle charger applications, and greatly expands the application scenarios of products with high integration and high reliability.
The figure shows the half-bridge drive application diagram of NSi6602, the chip dual-channel driver is isolated from each other, of which the LGA13 package supports up to 700V withstand voltage, the SOP16 package supports up to 1500V withstand voltage, and the SOP14 package supports up to 1850V withstand voltage, which meets the vast majority of switching power isolation applications, supports half-bridge LLC and phase-shifting full-bridge and other high-power applications.
Charging head net summary
With the rise of new energy applications, energy storage, solar wind energy and other applications, the demand for high-power switching power supplies is increasing day by day, and higher reliability and efficient switching power supplies can be said to be the cornerstone of new energy. The third generation of semiconductors is now widely used in mobile phones and computer fast charging, and silicon carbide and gallium nitride have also been used in high-power PC power supplies.
Nanocore micro has a rich product line, with isolation interface chip and drive sampling chip, can fully meet the high-power switching power supply applications, to meet the requirements of high efficiency and high reliability, while the sampling chip can be used for voltage current and temperature acquisition, to meet the comprehensive monitoring requirements.