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LP8862-Q1 Datasheet(PDF) 12 Page - Texas Instruments |
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LP8862-Q1 Datasheet(HTML) 12 Page - Texas Instruments |
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12 / 37 page  10 15 20 25 30 35 40 45 200 300 400 500 600 700 800 900 1000 R1 (k ) C008 VOUT_MAX = ( VBG R2 + 0.0387) x R1 + VBG LP8862-Q1 SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015 www.ti.com 7.3 Feature Description 7.3.1 Integrated DC-DC Converter The LP8862-Q1 DC-DC converter generates supply voltage for the LEDs and can operate in boost mode or in SEPIC mode. The maximum output voltage VOUT_MAX is defined by an external resistive divider (R1, R2). VOUT_MAX must be chosen based on the maximum voltage required for LED strings. Recommended maximum voltage is about 30% higher than maximum LED string voltage. Initial output voltage is about 88% of VOUT_MAX. DC-DC output voltage is adjusted automatically based on LED current sink headroom voltage. Maximum output voltage can be calculated with Equation 1: where • VBG = 1.2 V • R2 recommended value is 130 k Ω • Resistor values are in k Ω (1) Figure 7. Maximum Converter Output Voltage vs R1 Resistance The converter is a current mode DC-DC converter, where the inductor current is measured and controlled with the feedback. Switching frequency is adjustable between 300 kHz and 2.2 MHz with RFSET resistor as shown in Equation 2: ƒSW = 67600/ (RFSET + 6.4) where • ƒSW is switching frequency, kHz • RFSET is frequency setting resistor, kΩ (2) In most cases lower frequency has higher system efficiency. DC-DC parameters are chosen automatically according to the selected switching frequency (see Table 3). In boost mode a 15-pF capacitor CFB must be placed across resistor R1 when operating in 300-kHz to 500-kHz range (see Figure 19). When operating in 1.8- MHz to 2.2-MHz range CFB = 4.7 pF. 12 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: LP8862-Q1 |
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