JAJSHH5 May 2019 TAS5806MD
PRODUCTION DATA.
It is required that the peak current is smaller than the OCP (Over current protection) value which is 5A, there are 3 cases which cause high peak current flow through inductor.
NOTE
θ = 0.5 (BD Modulation), 0.14 (1SPW Modulation), 0.14 (Hybrid Modulation)
PWM Modulation | PVDD | L (uH) | C (uF) | Fsw (kHz) | Ipeak_power_up | Comments |
---|---|---|---|---|---|---|
BD Modulation (θ=0.5) | 24 | 4.7 | 0.68 | 384 (80kHz BW) | 6.07A (>5A OCP) |
|
24 | 10 | 0.68 | 384 (80kHz BW) | 3A | ||
12 | 4.7 | 0.68 | 384 (80kHz BW) | 3.32A | ||
12 | 10 | 0.68 | 384 (80kHz BW) | 1.55A | ||
24 | 4.7 | 0.68 | 768 (175kHz BW) | 3.25A | ||
24 | 10 | 0.68 | 768 (175kHz BW) | 1.55A | ||
1SPW Modulation (θ=0.14) | 24 | 4.7 | 0.68 | 384 (80kHz BW) | 1.84A |
|
24 | 10 | 0.68 | 384 (80kHz BW) | 0.87A | ||
12 | 4.7 | 0.68 | 384 (80kHz BW) | 0.92A | ||
12 | 10 | 0.68 | 384 (80kHz BW) | 0.44A | ||
12 | 4.7 | 0.68 | 768 (175kHz BW) | 0.46A |
|
|
24 | 4.7 | 0.68 | 768 (175kHz BW) | 0.93A | ||
24 | 10 | 0.68 | 768 (175kHz BW) | 0.87A |
PWM Modulation | PVDD | L (uH) | Fsw (kHz) | Ipeak_clipping | Comments |
---|---|---|---|---|---|
1SPW | 24 | 10 | 768 | 2.68A | For high PVDD case, 1SPW mode is a good option to improve thermal performance, but switching frequency can't be too low. |
24 | 10 | 576 | 3.58A | ||
24 | 10 | 384 | 5.37A (>5A OCP) | ||
12 | 10 | 768 | 1.34A | ||
12 | 4.7 | 768 | 2.86A | ||
BD | 24 | 10 | 768 | 1.56 | |
24 | 10 | 384 | 3.12 | ||
12 | 10 | 768 | 0.78 | ||
12 | 4.7 | 768 | 1.66 |
Same PVDD and switching frequency, larger inductance means smaller idle current for lower power dissipation. It's suggested that inductor's saturation current Isat, is larger than the amplifier's peak current during power-up and play audio.
In addition, the effective inductance at the peak current is required to be at least 80% of the inductance value in Table 54 to meet datasheet specifications. The minimum inductance is given in Table 54 .
PVDD (V) | Switching Frequency (kHz) | Modulation Scheme | Recommended Minimum Inductance (µH) for LC filter design |
---|---|---|---|
≤12 | 384 | BD | 4.7 µH + 0.68 µF |
>12 | 10 µH + 0.68 µF | ||
≤12 | 384 | 1 SPW/Hybrid | 10 µH + 0.68 µF |
>12 | 15 µH + 0.68 µF |
For higher switching frequency (Fsw), select inductors with minimum inductance to be 384 kHz/Fsw × L.