CS43130 datasheet(31/137 Pages) CIRRUS

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DS1073F1

CS43130

4.3 Class H Amplifier Output

4.3.3

HP Current Limiter

The CS43130 features built-in current-limit protection for the headphone output. Table 3-16 lists the threshold for the

current limit during the short-circuit conditions shown in Fig. 4-6. For the HP amplifiers, current is from the internal charge

pump output, and, as such, applies the current from VCP or VP.

Figure 4-6. HP Short Circuit Setup

4.3.4

External VCP_FILT Supply Mode

To bypass the CS43130 Class-H charge-pump circuit, provide external VCP_FILT± supply with the following conditions:

• When CS43130 is operating, apply +3.0 V with ±5% accuracy to VCP_FILT+ and apply –3.0 V with ±5% accuracy

to VCP_FILT–.

• When CS43130 is powered down, external circuits present Hi-Z state to the VCP_FILT+ pin (>1k impedance) and

VCP_FILT– pin (>10k impedance).

• To avoid possible damage, VCP_FILT± pins must remain within the absolute maximum rating specified.

Figure 4-7. External VCP_FILT Power-Up Sequence

For powering up CS43130 in this mode, the recommended sequence must be followed. This assumes that the CS43130

starts from the status where VCP_FILT± pin are presented with Hi-Z.

1. Set EXT_VCPFILT.

2. Wait 8 ms after I2C ACK.

3. Release and start to ramp external voltage on VCP_FILT± pin.

4. Wait until VCP_FILT+ pin voltage to be greater than +2.6V and VCP_FILT– to be less than –2.6 V.

GNDA/GNDCP

HPOUTA

HPOUTB

Charge

Pump

VCP

VCP_FILT–

VCP_FILT+

EXT_VCPFILT

PDN_HP

VCP_FILT+

VCP_FILT‐

8 ms

+3.0 V

‐3.0 V

+2.6 V

‐2.6 V

Hi‐Z

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