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The LLC topology allows the transformer to have significant leakage inductance, but much smaller primary-to-secondary capacitance, which significantly reduces common-mode current injection through the bias transformer. The LLC converter based on UCC25800 offers a high level of integration, low cost and high efficiency in a compact form factor. The EVM consists of two portions, namely, the pre-regulator board (left half) and the LLC board (right half). The two portions of the board can be used together or used only with the LLC board, as needed for evaluation. For details how to use this EVM, please refer to Section 5.
PARAMETER | TEST CONDITIONS | MIN | NOM | MAX | UNIT | |
---|---|---|---|---|---|---|
INPUT CHARACTERISTICS | ||||||
VIN | Input voltage, DC | 6 | 12 | 26 | V | |
IIN | Input current at full load | VIN = 6 V | 535 |
mA | ||
VIN = 12 V | 285 | |||||
VIN = 26 V | 140 | |||||
OUTPUT CHARACTERISTICS | ||||||
VOUT1 | Set-point, DC | VIN = 6 to 26 V | 17.93 | 18.10 | 18.27 | V |
IOUT1 | Output current range | VIN = 6 to 26 V | 0 | 85 | mA | |
VOUT1 | Load regulation | IOUT1 = IOUT2 No load to full load | -1.0 | 1.0 | % | |
VOUT1 | Pk-to-pk ripple | IOUT1 = IOUT2 at full load | 50 | mV | ||
VOUT2 | Set-point, DC | VIN = 6 to 26 V | -5.02 | -4.98 | -4.94 | V |
IOUT2 | Output current range | VIN = 6 to 26 V | -85 | 0 | mA | |
VOUT2 | Load regulation | IOUT1 = IOUT2No load to full load | -1.0 | 1.0 | % | |
VOUT2 | Pk-to-pk ripple | IOUT1 = IOUT2at full load | 35 | mV | ||
SYSTEMS CHARACTERISTICS | ||||||
η | Efficiency, with pre-regulator | IOUT1 = IOUT2 VIN = 12 V, full load | 59.3 | % | ||
η | Efficiency, without pre-regulator | IOUT1 = IOUT2 VIN = 15.6 V, full load | 82.8 | % | ||
η | Efficiency, w/o pre-regulator and w/o output LDO | IOUT1 = IOUT2 VIN = 15.6 V, full load | 88.1 | % | ||
fSW | LLC Switching frequency | Normal operation | 500 | kHz | ||
OCL | Output over-current limit | VIN = 6 to 26 V | 100 | mA | ||
THOT | Max temperature on board | Ambient temperature TAMB = 25 °C | < 55 | °C | ||
VPOUT | Pre-regulator output voltage | VIN = 6 to 26 V | 15.6 | V |