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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP8553TLE/NOPB датащи(PDF) 26 Page - Texas Instruments |
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LP8553TLE/NOPB датащи(HTML) 26 Page - Texas Instruments |
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26 / 42 page  LP8553 SNVS701B – SEPTEMBER 2011 – REVISED JANUARY 2014 www.ti.com Output Diode A Schottky diode should be used for the output diode. Peak repetitive current should be greater than inductor peak current (2.5A) to ensure reliable operation. Average current rating should be greater than the maximum output current. Schottky diodes with a low forward drop and fast switching speeds are ideal for increasing efficiency in portable applications. Choose a reverse breakdown voltage of the Schottky diode significantly larger (~60V) than the output voltage. Do not use ordinary rectifier diodes, since slow switching speeds and long recovery times cause the efficiency and the load regulation to suffer. Resistors for Setting the LED Current and PWM Frequency See Table 3 on how to select values for these resistors Filter Component Values Optimal components for 60 Hz VSYNC frequency and 4 Hz cut-off frequency of the low-pass filter are shown in the Typical Application diagrams and in the figure below. If 2 Hz cut-off frequency i.e. slower response time is desired, filter components are: C1 = 1 μF, C2 = 10 μF and R = 47 kΩ. If different VSYNC frequency or response time is desired, please contact TI representative for guidance. Table 2. Register Map ADDR REGISTER D7 D6 D5 D4 D3 D2 D1 D0 DEFAULT 00H Brightness BRT[7:0] 0000 0000 Control 01H Device Control BRT_MODE[1:0] BL_CTL 0000 0000 02H Fault OPEN SHORT 2_CHANN 1_CHANN BL_FAULT OCP TSD UVLO 0000 0000 ELS EL 03H ID PANEL MFG[3:0] REV[2:0] 1111 1100 04H Direct Control OUT[4:1] 0000 0000 05H Temp MSB TEMP[10:3] 0000 0000 06H Temp LSB TEMP[2:0] 0000 0000 72H EEPROM_con EE_READ EE_INIT EE_PROG EE_READ 0000 0000 trol Y Table 3. EEPROM Memory Map ADDR REGISTER D7 D6 D5 D4 D3 D2 D1 D0 A0H eeprom addr 0 CURRENT[7:0] A1H eeprom addr 1 BOOST_FREQ[1:0] EN_PWM TEMP_LIM[1:0] SLOPE[2:0] _&_I_CTR L A2H eeprom addr 2 ADAPTIVE_SPEED[1:0] ADV_SLO MODE_25/ EN_ADAPT EN_BOOS BOOST_IM I_SLOPE[ PE 50%_SEL T AX 1] A3H eeprom addr 3 UVLO[1:0] EN_PSP PWM_FREQ[4:0] WM A4H eeprom addr 4 PWM_RESOLUTION[1: EN_I_RE LED_FAUL I_SLOPE[0] DRV_HEADR[2:0] 0] S T_THR A5H eeprom addr 5 EN_VSY DITHER[1:0] VBOOST[4:0] NC A6H eeprom addr 6 PLL[12:5] A7H eeprom addr 7 PLL[4:0] EN_F_RES HYSTERESIS[1:0] 26 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: LP8553 |
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