JAJSI51A May 2019 – January 2023 TAS5825P
PRODUCTION DATA
Spread spectrum is used in some inductor free case to minimize EMI noise. The TAS5825P supports Spread Spectrum with triangle mode.
User need configure register SS_CTRL0 (0x6B) to Enable triangle mode and enable spread spectrum, select spread spectrum frequency and range with SS_CTRL1 (0x6C). For 384 kHz FSW which configured by DEVICE_CTRL1 (0x02), the spread spectrum frequency and range are described in #GUID-EDC3E973-55B6-4A3A-9AA2-31E346698DC4/T4748593-74.
SS_TRI_CTRL[3:0] | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
---|---|---|---|---|---|---|---|---|
Triangle Freq | 24k | 48k | ||||||
Spread Spectrum Range | 5% | 10% | 20% | 25% | 5% | 10% | 20% | 25% |
User Application example: Central Switching Frequency is 384 kHz, Triangle Frequency is 24 kHz.
Register 0x6b = 0x03 // Enable Spread Spectrum
Register 0x6c = 0x03 // SS_CTRL[3:0]=0011, Triangle Frequency = 24 kHz, Spread Spectrum Range must be 25% (approximately 336 kHz – 432 kHz)