EMI Comparison of TPSM843820 and TPSM843620 Buck Converters
"Explore the efficiency, thermal performance, conducted and radiated EMI data, input pi filters, and Draco module details of TPSM843820 and TPSM843620 low EMI buck converters. Discover insights into load current efficiency, EMI optimization, and layout considerations for these power modules." (291 characters)
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Presentation Transcript
TPSM843820 EMI Low EMI Buck Converter comparison Camilo Alvarez & McKenna Strambi Last updated: 5/2/24 1 TI Confidential Maximum Restrictions Internal only Do not share externally
Test board pictures TPSM843620 TI Confidential Maximum Restrictions Internal only Do not share externally
TPSM843620: Efficiency and thermals (at full load) TPSM843620: Efficiency vs Iout 0.86 0.85 0.84 Efficiency 0.83 0.82 0.81 0.8 0.79 0 1 2 3 4 5 6 7 Load Current (A) 500kHz 3 TI Confidential Maximum Restrictions Internal only Do not share externally
Conducted EMI data 4 TI Confidential Maximum Restrictions Internal only Do not share externally
Input pi filters L1 = 2.2uH 500KHz 2.2uH inductor 2x 22uF caps 2.2MHz Ferrite bead with 159nH inductance at 2.2MHz 2x 22uF caps 5 TI Confidential Maximum Restrictions Internal only Do not share externally
Draco Module TPSM843620 12V -> 1.2V @ 6A 2.2MHz 500kHZ 6 TI Confidential Maximum Restrictions Internal only Do not share externally
Radiated EMI 500kHz vs 2.2MHz 7 TI Confidential Maximum Restrictions Internal only Do not share externally
Draco Module TPSM843620 12V -> 1.2V @ 6A 2.2MHz 500kHZ 8 TI Confidential Maximum Restrictions Internal only Do not share externally
Radiated EMI Original EVMs with Input Filter vs Redone Layout 9 TI Confidential Maximum Restrictions Internal only Do not share externally
Draco Module TPSM843620 12V -> 1.2V @ 6A 500kHz EVM EMI Optimized Layout 10 TI Confidential Maximum Restrictions Internal only Do not share externally
Spec Comparison (Mid Vin) Parameter TPS543820 (Draco Converter) TPSM843620 (Draco Module) TPS543A22 (Draco Sr.) TPSM843A22 (Draco Sr. Module) Vin 4V 18V 4V 18V 4V 18V 4V 18V Iout (max) 8A 6A 12A 12A Iq (typ) (uA) 1200 1200 1200 1200 Fsw 500KHz, 750KHz, 1MHz, 1.5MHz, 2.2MHz 500KHz, 750KHz, 1MHz, 1.5MHz, 2.2MHz 500KHz, 750KHz, 1MHz, 1.5MHz, 2.2MHz 500KHz, 750KHz, 1MHz, 1.5MHz, 2.2MHz Or external clock sync Or external clock sync Or external clock sync Or external clock sync Package 2.5-mm 3-mm VQFN-HR (14) 3.5mm x 3.5mm SIT (15) 2.50mm x 4.50mm WQFN-FCRLF (17) 6.50mm x 7.50mm B3QFN-RDG (25) Operating junction temperature range -40 150C -40 125C -40 150C -40 125C JA = 58.9C/W (JEDEC) JA = 29.1C/W (TI EVM) JA = N/A (JEDEC) JA = 31.2C/W (TI EVM) JA = 33.9C/W (JEDEC) JA = 18.6C/W (TI EVM) JA = N/A (JEDEC) JA = 13.2C/W (TI EVM) Features Mirrored Vin pins Internal compensation Internal compensation Internal inductor Mirrored Vin pins Internal compensation True differential remote sense amplifier Mirrored Vin pins Internal compensation True differential remote sense amplifier 13 TI Confidential Maximum Restrictions Internal only Do not share externally
