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LP8866S-Q1 Datasheet(PDF) 23 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 82 page  Table 7-3. Boost Synchronization Mode (continued) BST_SYNC PIN LEVEL BOOST CLOCK MODE 100-kHz to 2222-kHz clock frequency Spread spectrum disabled, external synchronization mode If using the external BST_SYNC input, the RBST_SET resistor should be chosen the closest boost frequency options with the external frequency. The spread spectrum function helps to reduce EMI noise around the switching frequency and its harmonic frequencies. The internal spread spectrum function modulates the boost frequency ±3.3% to 7.2% from the central frequency with a 200-Hz to 1.2-kHz modulation frequency. The switching frequency variation is programmable by SPREAD_RANGE register, and the modulation frequency is programmable by SPREAD_MOD_FREQ register. The spread-spectrum function cannot be used when an external synchronization clock is used. Table 7-4. Spread Spectrum Frequency Range SPREAD_RANGE (Binary) SWITCHING FREQUENCY VARIATION 00 ±3.3% 01 ±4.3% 10 (Default) ±5.3% 11 ±7.2% Table 7-5. Spread Spectrum Modulation Frequency SPREAD_MOD_FREQ (Binary) MODULATION FREQUENCY 00 (Default) 200 Hz 01 500 Hz 10 800 Hz 11 1200 Hz 7.3.6.5 Boost Output Discharge When the EN pin is pulled low, the device stops the boost controller and LED current sinks, turns off the power- line FET, and starts to discharge the boost output. The discharge pin typically sinks 30-mA current. The discharge duration is 400 ms. After 400 ms, the device shuts down. The DISCHARGE pin must be connected with boost output for normal operation. There is one internal comparator to monitor the voltage of DISCHARGE pin. As soon as the voltage of DISCHARGE pin is higher than VBST_OVPH (typically 50 V), the device enters into fault recovery mode, and BST_OVPH fault is reported. This provides further protection if boost voltage is out of control because of system failure. Discharge function is only available in HTSSOP package. It's not available in QFN package. 7.3.6.6 Light Load Mode The DC-DC controller will enter into light load mode in below condition: • VIN voltage is very close to VOUT • Loading current is very low • PWM pulse width is very short When DC-DC converter enters into light load mode, it stops switching occasionally to make sure output voltage won't rise up too much. It could also be called as PFM mode, since the DC-DC converter switching frequency will change in this mode. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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