SiC461, SiC462, SiC463, SiC464 www.vishay.com Vishay Siliconix Reference Board Users Manual for SiC464 (2 A), SiC463 (4 A), SiC462 (6 A), and SiC461 (10 A) Synchronous Buck Regulators FEATURES Versatile - Single supply operation from 4.5 V to 60 V input voltage - Adjustable output voltage down to 0.8 V - Scalable solution 2 A (SiC464), 4 A (SiC463), 6 A (SiC462), 10 A (SiC461) -Output voltage tracking and sequencing with pre-bias start up - 1 % output voltage accuracy at -40 C to +125 C Highly efficient - 98 % peak efficiency - 5 A supply current at shutdown DESCRIPTION - 250 A operating current not switching Highly configurable This reference board allows the user to evaluate the SiC461 (10 A), SiC462 (6 A), SiC463 (4 A), or the SiC464 (2 A) - Adjustable switching frequency from 100 kHz to 2 MHz microBUCK regulators for their features and functionalities. - Adjustable soft start and adjustable current limit It can also be a reference design for a user s application. The - 3 modes of operation, forced continuous conduction, board is configured for 4.5 V to 60 V input. Output is model power save or ultrasonic dependent. The operating range may be modified by Robust and reliable changing components such as the inductor, feedback - Output over-voltage protection resistor, and ripple injection networks. - Output under-voltage / short circuit protection with auto The SiC46x family of microBUCK regulators is a wide input retry voltage high efficiency synchronous buck regulator with - Power good flag and over temperature protection integrated high-side and low-side power MOSFETs. Its Design support tool power stage is capable of supplying up to 10 A continuous - PowerCAD online design simulation current at up to 2 MHz switching frequency. These SiC461, SiC462, SiC463, SiC464 www.vishay.com Vishay Siliconix CONNECTION AND SIGNAL / TEST POINTS Power Terminals (J5) V External Supply DRV - V , GND (J5, Pin 1 and Pin 2): (see Fig. 1 below) 5 V, GND (J7): this is the terminal that enables the user to IN supply an external MOSFET gate driver supply if an external Connect to a voltage source: 4.5 V to 60 V. Note: output 5 V supply is available. This should only be used in modes 3 voltage will vary depending on model number of the and 4. R14 must also be inserted if an external V is used. DRV board. The value of R12 determines V . The minimum OUT The standard version of the board does not have this input voltage will be 4.5 V with no UVLO and the output will component. See schematic. be active but unregulated when V -V is less than 2 V. A IN OUT UVLO function can be instituted by inserting a suitable value Enable resistor for R17. The start voltage will be reached when the J9: this is the terminal that enables the part. voltage at the enable, pin 3, reaches 0.8 V. This will keep The EN pin has an internal pull down resistor and only the output from coming up in an unregulated state during requires an enable voltage. This needs to be greater than V start up transitions. OUT 1.4 V. An input voltage or a resistor connected across V IN - V , GND (J5, Pin 3 and Pin 4): (see Fig. 1 below) OUT and EN can be used. The internal pull down resistance is Connect to a load that draws no more than: 5 M. There is a pull up resistor, R3, of 560K which allows SiC461 - 10 A, SiC462 - 6 A, SiC463 - 3 A, SiC464 - 2 A the board to start with no external stimulus. WARNING: attaching the EN input to an external source Note requires careful consideration as this pin will be at V in The output capacitors are rated to 25 V. Should a higher output IN voltage be required, the output capacitors should be changed to series with R3. This will cause a standard GPIO to be an appropriate higher voltage. damaged. Ultrasonic J8: this is jumper that will enable the user to select the ultrasonic mode of operation. In ultrasonic mode the minimum frequency of operation is 20 kHz, above the audible range. When not in ultrasonic mode the frequency can drop below 20 kHz. OPEN J8 - Ultrasonic disabled SHORT J8 - Ultrasonic enabled Fig. 1 - PCB Showing Power Terminal Connections SELECTION JUMPERS Mode Select J1, J2, J3, and J4: there are 4 jumpers which allow the user to select one of four modes of operation. MODE 1 - SHORT J1 power save, V , and pre-reg on DRV MODE 2 - SHORT J2 forced PWM, V , and pre-reg on DRV MODE 3 - SHORT J3 forced PWM, V , and pre-reg off - DRV external 5 V supply MODE 4 - SHORT J4 power save, V , and pre-reg off - DRV external 5 V supply Revision: 24-Aug-17 Document Number: 76257 2 For technical questions, contact: powerictechsupport vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000