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LP8866S-Q1 Datasheet(PDF) 16 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 82 page  L FB VDD ISNSGND COUT ISNS GD CIN C1N C1P CPUMP SD PGND VOUT 5V VSENSE_P VIN VSENSE_N 3 to 48V VDD CVDD CPUMP Figure 7-2. Charge Pump Disabled Circuit If the charge pump is enabled, the CPCAP_STATUS bit shows whether a fly capacitor was detected and the CP_STATUS bit shows status of any charge pump faults and generates an INT signal. The CP_INT_EN bit can be used to prevent the charge-pump fault from causing an interrupt on the INT pin. 7.3.6 Boost Controller The LP8866S-Q1 current-mode-controlled boost DC/DC controller generates the anode voltage for the LEDs. The boost is a current-mode-controlled topology with a cycle by cycle current limit. The boost converter senses the switch current and across the external sense resistor connected between ISNS and ISNSGND. A 20-mΩ sense resistor results in a 10-A cycle by cycle current limit. The sense resistor value could vary from 15 mΩ to 50 mΩ depending on the application. Maximum boost voltage is configured with external FB-pin resistor divider connected between VOUT and FB. The FB-divider equation is described in Section 7.3.6.3. MUX ADC + ± R Q Q S Adaptive voltage control VREF R2 GM + ± BOOST OSCILLATOR OFF/BLANK TIME PULSE GENERATOR CURRENT RAMP GENERATOR COMP + ± GM OVP OCP TSD COUT CIN PGND ISNS ISNSGND FB GD CPUMP BST_FSET BST_SYNC VIN VOUT R1 Figure 7-3. Boost Controller Block Diagram The boost switching frequency is adjustable from 100 kHz to 2.2 MHz via an external resistor at BST_FSET (see Table 7-1). Resistor with 1% accuracy is needed to ensure proper operation. LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 16 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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