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MP1529DR Datasheet(PDF) 4 Page - Monolithic Power Systems |
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MP1529DR Datasheet(HTML) 4 Page - Monolithic Power Systems |
4 / 4 page EV1529DR-00A – FIXED FREQUENCY CONVERTER LCD BACKLIGHT EV BOARD NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV1529DR-00A Rev. 1.0 www.MonolithicPower.com 4 11/2/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM QUICK START GUIDE The LED currents at backlight mode, backlight plus review mode and flash mode are set to 20mA, 40mA, and 100mA, respectively on this board. The board layout accommodates mostly common used inductors and output capacitors. 1. Preset Power Supply to 2.7V ≤ VIN ≤ 4.2V. 2. Turn Power Supply off. 3. Connect Power Supply terminals to: a. Positive (+): VIN b. Negative (–): GND 4. Solder the first backlight LED string to LED1 - LED4. Solder the second backlight LED string to LED5 – LED8. Solder the flash LED string to LED9 – LED12. Set EN1 and EN2 based on the Enable Operation Table below. Connect EN1, EN2 to VIN to set them “H” and to GND to set them “L”. Mode EN1 EN2 Strings 1+2: LCD Backlight LEDs String 3: Flash LEDs Off L L Off Off Backlight H (PWM) L On (PWM) Off Backlight plus Preview H (PWM) H On (PWM) Preview current Flash L H Off Flash current 5. Turn Power Supply on after making connections. The LED currents can be adjusted by changing the values of resistors RS1, RS2, and RS3. VSET = 1.216V. BL _ LED SET I V 950 1 RS × = PV _ LED SET I V 1100 2 RS × = FL _ LED SET I V 1000 3 RS × = For examples, If ILED_BL = 10mA, then Ω = × = k 52 . 115 10 216 . 1 950 1 RS (Use a 115kΩ 1% resistor) If ILED_PL = 20mA, then Ω = × = k 88 . 66 20 216 . 1 1100 2 RS (Use a 66.5kΩ 1% resistor) If ILED_FL = 150mA, then Ω = × = k 11 . 8 150 216 . 1 1000 3 RS (Use a 8.06kΩ 1% resistor) |
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