Part Details for PM8834 by Honest Han

This 75 W digitally controlled constant current LED driver consists of a PFC stage and two parallel DC-DC converters designed to work in transition mode (TM) to achieve optimized efficiency. The LED driver can dim the LEDs down to 0.5% of the maximum brightness level through both analog and digital approaches. The operation is flicker free across the entire dimming range using either of the dimming techniques.<p>The 32-bit STM32F071CB microcontroller implements digital power controls for both the PFC and DC-DC conversion stages, which is highly advantageous in terms of cost and flexibility compared with the standard design based on analog ICs.<p>The STD11N60M2-EP N-Channel 600 V MDmesh™ M2 Power MOSFET used in the PFC and DC-DC converters is a key design choice as it is tailored for optimal performance under light load conditions, which is desirable in dimming applications, while its DPAK package helps maintain a slim profile in commercial solutions.<p>The PM8841 is the high frequency single channel low-side MOSFET driver employed in the PFC boost converter. The driver is specifically designed to work with digital power conversion microcontrollers such as the STM32 family. The PM8841 output can sink 1 A and source 0.8 A, which is well suited for the application.<p>The buck converter MOSFET is driven by the L6395 gate driver, whose high-side (floating) section is designed to withstand a voltage rail up to 600 V. The logic inputs are CMOS/TTL compatible down to 3.3 V for easy microcontroller/DSP interfacing.<p>The inverse/modified buck converter is driven by the flexible, high-frequency dual low-side PM8834 driver, specifically designed to work with high capacitive MOSFETs and IGBTs. Both PM8834 outputs can sink and source 4 A independently. The second channel of PM8834 is used for 0-10V dimming function.<p>The microcontroller and the gate driver section are supplied through a VIPer012LS 60 kHz high voltage off-line converter, which manages the auxiliary SMPS in flyback topology.