SLVT253 July   2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Safety Considerations
    5. 1.5 Dimensions
    6. 1.6 Test Setup
  7. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plot
  8. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-up Sequence
    5. 3.5 Shut-down Sequence
    6. 3.6 AC Waveforms
  9. 4Static Regulation
  10.   Trademarks

3.1 Switching

The switching behavior of PFC and LLC stages are shown in Figure 3-1 through Figure 3-4.

Conditions: VIN = 230VAC, Battery voltage = 28V, Charging current = 0A, System output current = 10A

C1: VDS of Q10, C2: VDS of Q7SW pin of U2, C3: Resonant current (L6), C4: VDS of Q1

PMP31276 Switching Waveforms LLC Stage at 230VAC and 10A System Load Current Figure 3-1 Switching Waveforms LLC Stage at 230VAC and 10A System Load Current

C2: SW1 node, C4: SW2 node, C3: Battery current (AC coupling)

PMP31276 Switching Waveforms on 4-SW Buck-Boost Stage at 230VAC, VBAT = 27V, ICHG = 2A and 1A System Current Load Figure 3-2 Switching Waveforms on 4-SW Buck-Boost Stage at 230VAC, VBAT = 27V, ICHG = 2A and 1A System Current Load

C2: SW1 node, C4: SW2 node, C3: Battery current (AC coupling)

PMP31276 Switching Waveforms on 4-SW Buck-Boost Stage at 230VAC, VBAT = 22V, ICHG = 2A and 1A System Current Load Figure 3-3 Switching Waveforms on 4-SW Buck-Boost Stage at 230VAC, VBAT = 22V, ICHG = 2A and 1A System Current Load

C1: VDS of Q3, C2: VDS of Q1

PMP31276 Switching Waveforms on PFC Stage at 230VAC, VBAT = 28V, ICHG = 0A and 10A System Current Load Figure 3-4 Switching Waveforms on PFC Stage at 230VAC, VBAT = 28V, ICHG = 0A and 10A System Current Load