JAJSNA0 December 2022 TPS25762-Q1
PRODUCTION DATA
The PWM oscillator frequency (fsw) is programmed by firmware using the application configuration GUI. The switching converter is intended for operation below the AM radio band (520 kHz - 1730 kHz). Three nominal fsw settings below are available: 300 kHz, 400 kHz and 450 kHz.
Frequency dithering can be enabled by firmware via the application GUI. When enabled, the nominal oscillator frequency is dithered by ±FSSS (approximately ±10%) using triangular waveform modulation (see Dithering using triangular waveform modulation). The dither period τM is the reciprocal of the dither modulation frequency FSSS_MOD. Two firmware selectable dither modulation frequencies FSSS_M are available: 10 and 25 kHz. Dithering spreads the spectral peaks generated by switching, thereby reducing the peak harmonic levels and easing EMI filter design.
Multiple converters can be synchronized using the SYNC pin. This pin can be firmware-configured as either an output SYNC(o) or an input SYNC(i).
fSW Firmware Setting | Allowed SYNC(i) Frequency Range | |
---|---|---|
MIN | MAX | |
300 kHz | 250 kHz | 353 kHz |
400 kHz | 334 kHz | 470 kHz |
450 kHz | 376 kHz | 530 kHz |