SLUUCI9A January   2022  – December 2022 UCC28781

 

  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
  4. 2 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  5. 3 Description of EVM
  6. 4 Electrical Performance Specifications of EVM
  7. 5 Schematic Diagram of EVM
  8. 6 Operating the EVM from a DC or an AC Source
    1. 6.1 Typical Applications
    2. 6.2 Using the EVM with a DC Voltage Source
    3. 6.3 Using the EVM with an AC Voltage Source
  9. 7 Test Set-ups
    1. 7.1 Test Set-up Requirements
      1. 7.1.1 Test Set-up Requirements for DC Input
      2. 7.1.2 Test Set-up Requirements for AC Input
    2. 7.2 Test Set-up Diagrams
    3. 7.3 Terminals and Test Points
  10. 8 Performance Data and Typical Characteristic Curves
    1. 8.1 Table of Efficiency Measurements with DC Input
    2. 8.2 Table of Efficiency Measurements with AC Input
    3. 8.3 Efficiency Graphs with DC Input Voltage (Typical Results)
    4. 8.4 Switching Frequencies in Various Operating Modes
    5. 8.5 Key Switching Waveforms and Operating Mode Load Current
    6. 8.6 Thermal Images at Full Load (15 V, 4.0 A) with DC and AC Inputs
  11. 9 Transformer Details
  12. 10EVM Assembly and Layout
  13. 11List of Materials
  14. 12Revision History

4 Electrical Performance Specifications of EVM

Table 4-1 EVM Performance1 with DC Input (Primary Switch = Si MOSFET)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT CHARACTERISTICS
VIN Input line voltage (DC) 50 400 500 V
PSTBY5 Input power at no-load,
VO = 15 V		 VIN = 500 VDC, IO = 0 A 47 mW
VIN = 250 VDC, IO = 0 A 36 mW
OUTPUT CHARACTERISTICS
VO Output voltage, steady-state VIN = 250 to 500 VDC, 0 A ≤ IO ≤ IO(FL_HI) 14.7 15 15.3 V
VIN = 50 to 250 VDC, 0 A ≤ IO ≤ IO(FL_LO)
IO(FL_HI) Full-load rated output current,
high input range		 VIN = 250 to 500 VDC 4 A
IO(FL_LO) Full-load rated output current,
low input range		 VIN = 50 to 250 VDC 2 A
VO_pp Output ripple voltage, peak to peak, high input range VIN = 250 to 500 VDC, 0 A ≤ IO ≤ IO(FL_HI) 350 500 mVpp
Output ripple voltage, peak to peak, low input range VIN = 50 to 250 VDC, 0 A ≤ IO ≤ IO(FL_LO) 200 300
PO(OPP)4 Over-power protection threshold VIN = 50 to 500 VDC 70 W
tOPP4 Over-power protection duration VIN = 50 to 500 VDC, PO > PO(OPP) 160 ms
ΔVO Output voltage transient deviation at load-step IO steps between 0 A and IO(FL_HI) at 100 Hz
VIN = 250 to 500 VDC		 -1300 +700 mVpk
SYSTEM CHARACTERISTICS
ηFL Full-load efficiency2 VIN = 500 VDC, IO = IO(FL_HI) 0.932
VIN = 250 VDC, IO = IO(FL_LO) 0.937
ηavg 4-point average efficiency23 VIN = 500 VDC, IO(FL_HI) range 0.905
VIN = 250 VDC, IO(FL_LO) range 0.919
η10% Efficiency at 10% load2 VIN = 500 VDC, IO = 10% of IO(FL_HI) 0.808
VIN = 250 VDC, IO = 10% of IO(FL_LO) 0.835
TAMB Ambient operating temperature range VIN = 50 to 500 VDC, IO = 0 to IO(FL) 25 °C
(1) The performance listed in this table is based on the test results from a single board, using either DC input or AC input for their respective results.
(2) After ≥30 minutes of operation. Power losses from external input and output cables are not included in efficiency results.
(3) Average efficiency of four load points: IO = 100%, 75%, 50%, and 25% of IO(FL).
(4) OPP function not available in UCC28781A.
(5) Input stand-by power measured with XCD function disabled.
Table 4-2 EVM Performance1 with AC Input (Primary Switch = Si MOSFET)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
INPUT CHARACTERISTICS
VIN Input AC-line voltage (RMS) 90 115 / 230 264 V
fLINE Input AC-line frequency 47 50 / 60 63 Hz
PSTBY56 Input power at no-load,
VO = 15 V		 VIN = 230 VRMS, IO = 0 A 42 mW
VIN = 115 VRMS, IO = 0 A 36
OUTPUT CHARACTERISTICS
VO Output voltage, steady-state VIN = 180 to 264 VRMS, 0 A ≤ IO ≤ IO(FL_HI) 14.7 15 15.3 V
VIN = 90 to 180 VRMS, 0 A ≤ IO ≤ IO(FL_LO)
IO(FL_HI) Full-load rated output current,
high input range		 VIN = 180 to 264 VRMS 4 A
IO(FL_LO) Full-load rated output current,
low input range		 VIN = 90 to 180 VRMS 2 A
PO(OPP)4 Over-power protection threshold VIN = 90 to 264 VRMS 70 W
tOPP4 Over-power protection duration VIN = 90 to 264 VRMS, PO > PO(OPP) 160 ms
ΔVO Output voltage transient deviation at load-step IO steps between 0 A and IO(FL_HI) at 100 Hz
VIN = 180 to 264 VRMS		 -1300 +700 mVpk
SYSTEMS CHARACTERISTICS6
ηFL Full-load efficiency2 VIN = 230 VRMS, IO = IO(FL_HI) 0.9336
VIN = 115 VRMS, IO = IO(FL_LO) 0.9271
ηavg 4-point average efficiency23 VIN = 230 VRMS, IO(FL_HI) range 0.9213
VIN = 115 VRMS, IO(FL_LO) range 0.9150
η10% Efficiency at 10% load2 VIN = 230 VRMS, IO = 10% of IO(FL_HI) 0.8684
VIN = 115 VRMS, IO = 10% of IO(FL_LO) 0.8480
TAMB Ambient operating temperature range VIN = 90 to 264 VRMS, IO = 0 to IO(FL) 25 °C
(1) The performance listed in this table is based on the test results from a single board, using either DC input or AC input for their respective results.
(2) After ≥30 minutes of operation. Power losses from external input and output cables are not included in efficiency results.
(3) Average efficiency of four load points: IO = 100%, 75%, 50%, and 25% of IO(FL).
(4) OPP function not available in UCC28781A.
(5) Input stand-by power measured with XCD function disabled.
(6) Excludes power loss from bulk voltage bleeder resistors R33, R34, and R35 across bulk capacitor C2.