SNVA991 October 2022 LM5123-Q1
This design example produces a variable load voltage boost. Applications such as Class H audio amplifiers, and LED drivers require a variable output voltage from a boost regulator to greatly improve the system efficiency. The load voltage range for this design is 24 V to 33 V and provides a maximum power of 200 W from a standard 12 V automotive battery. The output voltage is adjusted using the TRK pin of the device. The detailed parameters are presented in Table 1-1 and the component selection is discussed in Section 2.
PARAMETER | Test Conditions | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
INPUT VOLTAGE CHARACTERISITCS | ||||||
Input Voltage Range | Operation | 8 | 14 | 18 | V | |
Input UVLO levels | Turn-off | 5.2 | V | |||
Turn-on | 6.2 | V | ||||
OUTPUT CHARACTERISITCS | ||||||
Load Voltage | VTRK = 400 mV (VLOADmin) | 24 | V | |||
VTRK = 583 mV (VLOADmax) | 35 | V | ||||
POUTmax | VSUPPLY= 8 V to 18 V | 200 W | W | |||
SYSTEM CHARACTERISITCS | ||||||
fSW | 440 | kHz |