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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS43131 датащи(PDF) 36 Page - Cirrus Logic |
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CS43131 датащи(HTML) 36 Page - Cirrus Logic |
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36 / 156 page  36 DS1155F1 CS43131 4.3 Class H Amplifier Output 4.3.3 HP Current Limiter The CS43131 features built-in current-limit protection for the headphone output. Table 3-18 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 CS43131 Class-H charge-pump circuit, provide external VCP_FILT± supply with the following conditions: • When CS43131 is operating, apply +3.0 V with ±5% accuracy to VCP_FILT+ and apply –3.0 V with ±5% accuracy to VCP_FILT–. • When CS43131 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 CS43131 in this mode, the recommended sequence must be followed. This assumes that the CS43131 starts from the status where VCP_FILT± pins are presented with Hi-Z. 1. Set EXT_VCPFILT and HV_EN bits. 2. Wait 8 ms after I2C ACK. 3. Release and start to ramp external voltage on VCP_FILT± pins. 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 I I VCP VCP_FILT– VCP_FILT+ VP EXT_VCPFILT PDN_HP VCP_FILT+ VCP_FILT‐ 8 ms +3.0 V ‐3.0 V +2.6 V ‐2.6 V Hi‐Z Hi‐Z |
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