Holtek has released two new asynchronous step-down converter devices, the HT7463C and HT7463D, which are suitable for 48V systems, smart lighting, security products, smart meters and smart home appliances.
These new devices have an input voltage range of 4.5V~60V and an input voltage maximum rating of 66V. The devices are excellent for use in 5V/12V/24V/36V/48V input voltage applications, such as 12V/24V adaptors, 36V security bus products and 48V battery packs. Their 0.6A output current capability is able to supply a stable voltage for WiFi modules, PLC modules and LEDs.
These devices are able to limit the input power during power on by connecting resistors and capacitors to the EN pin. For input power applications with power limitations, such as for bus power, this function can reduce the inrush current during power on and therefore avoid large input voltage drops.
These two new devices are divided according to switching frequency. The HT7463C has a switching frequency of 1.25MHz, which is suitable for applications which have a low voltage difference between their input and output and which have a low-output-ripple requirement.
For smart meter applications, by using suitable inductors and output capacitors, a 1? output ripple value can be achieved. The HT7463D has a switching frequency of 550kHz, making it more suitable for applications which have larger voltage differences between their input and output, such as security products and 48V systems.
