SLUUBZ3C May 2020 – October 2022 LMG2610 , UCC28782
- 1 Using the UCC28782EVM-030 65-W USB-C PD High-Density Active-Clamp Flyback Converter
- 2 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
- 3 Description
- 4 Electrical Performance Specifications
- 5 Schematic Diagram
- 6 Description
- 7 Test Setup
-
8 Performance Data and Typical Characteristic Curves
- 8.1 Efficiency Result of 4-Point Average on 20-Vout
- 8.2 Efficiency Result of 4-Point Average at 15-Vout
- 8.3 Efficiency Result of 4-Point Average at 9-Vout
- 8.4 Efficiency Result of 4-Point Average at 5-Vout
- 8.5 Efficiency Typical Results
- 8.6 Output Characteristics
- 8.7 Switching Frequency
- 8.8 Key Switching Waveforms and Operation Mode Load Current
- 8.9 Start Up
- 8.10 Output Voltage Adjustment by USB-C PD
- 8.11 Line Transient Response
- 8.12 Output Ripple Voltage
- 8.13 Boost Function for VDD Bias
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- 8.14 X-Capacitor Discharge
- 8.15 USB-C PD Over Current Limit
- 8.16 Load Transient Response
- 8.17 EN55022 Class B Conducted EMI Test Result
- 8.18 Thermal Images at Full Load (20V and 3.25 A)
- 9 Transformer Details
- 10EVM Assembly and Layout
- 11List of Materials
- 12Revision History
8.8 Key Switching Waveforms and Operation Mode Load Current
This section shows typical operation modes in Table 8-1 along with typical load currents in this design and with Vin = 115Vac and Vo = 20V as an example.
- AAM: Adaptive Amplitude Modulation
- ABM: Adaptive Burst Mode
- LPM: Low Power Mode
- SBP1: First Standby Power Mode
- SBP2: Second Standby Power Mode
Table 8-1 Operation Mode and Load Current at 20-V Output and 115Vac Input
| Mode | AAM | ABM | LPM | SBP1 | SBP2 | Survival |
|---|---|---|---|---|---|---|
| Burst Frequency, fBUR | Not Applicable | > 25kHz (2 to 9 pulses) | about 25kHz (2 pulses) | 8.5kHz to 25kHz (2 pulses) | < 8.5kHz (2 pulses) | about 8 pulses |
| Typical Load Current | 1.8 A to 3.25 A | 0.5 A to 1.8 A | 0.2 A to 0.5 A | 0.1 A to 0.2 A | < 0.1 A | Not Applicable |
Figure 8-9 Typcial Waveform in AAM Operation Yellow = PWML, Red = PWMH, Green = Transformer Primary Winding Current (0.2 V/A), Blue = Switch Node Voltage
Figure 8-11 Typical Waveform in ABM Operation Yellow = PWML, Red = Vgs of SR MOSFET, Green = Transformer Primary Winding Current (0.2 V/A), Blue = Switch Node Voltage
Figure 8-10 Typical Waveform in ABM Operation Yellow = PWML, Red = PWMH, Green = Transformer Primary Winding Current (0.2 V/A), Blue = Switch Node Voltage
Figure 8-12 Typical Waveform in LPM Operation Yellow = PWML, Red = PWMH, Green = Transformer Primary Winding Current (0.2 V/A), Blue = Switch Node Voltage
Figure 8-13 Typical Waveform in SBP1 Operation Yellow = PWML, Red = PWMH, Green = Transformer Primary Winding Current (0.2 V/A), Blue = Switch Node Voltage
Figure 8-14 Typical Waveform in SBP2 Operation Yellow = PWML, Red = PWMH, Green = Transformer Primary Winding Current (0.2 V/A), Blue = Switch Node Voltage