STMicroelectronics STNRG328S Digital Controller for STC/HSTC

STMicroelectronics STNRG328S Digital Controller for STC/HSTC open-loop resonant converters is designed for power conversions. The device performs a power conversion from an input voltage in a typical range of 40V to 60V to an output voltage with a programmable conversion ratio from 2:1 to 10:1 with a fixed duty cycle and programmable frequency from 140kHz to 300kHz.

The STNRG328S Digital Controller supports an output power in the range from 500W up to 2KW with very high efficiency in a wide load range and an efficiency peak of 98.4%.

The State Machine Event Driven (SMED) implements vital features to ensure all the STC/HSTC control functions. The SMED drives the ZCD (Zero Current Detection) feature allowing management of the deadtime and the switching frequency to achieve the perfect LC resonance and top efficiency independently from the external component variations. The STNRG328S firmware is specifically designed to program the SMED and implement the control strategy.

The STNRG328S combined with the STPRDC02A gate drivers, designed for STC applications, and a hot-swap circuit (typically an e-fuse) avoids damages during hot plug-in of the input 48V bus.

Features

Digital controller for STC/HSTC topologies
Support wide conversion ratio from 2:1 to 10:1 to provide several Vout
State Machine Event Driven (SMED) to implement key control features:
- Current limit in combination with hot-swap controller
- Operating input voltage window
- Conversion ratio control
- PWM frequency and deadtime management to guarantee ZCD function
- Soft-start control
- Driver management
- Temperature control
Typical application: Server DC/DC intermediate bus generation from 40V to 60V input voltage, 200W to 2kW output power range

Peripherals
- 10-bit ADC
- UART interface
- I²C master fast/slow speed rate
- GPIOs
Memory
- Flash and EEPROM with read-while-write (RWW) and Error Correction Code (ECC)
- Program memory of 32Kbytes Flash; data retention: 20 years at 55°C after 1000 cycles at 55°C
- Data memory of 1Kbyte true data EEPROM; data retention: 20 years at 55°C after 1000 cycles at 85°C
- 6Kbytes RAM
-40°C up to 105°C Operating temperature
VFQFPN32 5mm x 5mm package

STMicroelectronics STNRG328S Digital Controller for STC/HSTC

Features

STC Typical Application

Device Architecture

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