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| TM EV1529DR-00A Fixed Frequency Step-Up Converter LCD Backlight Plus Flash Evaluation Board The Future of Analog IC Technology TM GENERAL DESCRIPTION The EV1529DR-00A evaluation board is designed to drive 2 strings of up to 4 backlight LEDs to 30mA and a 4-LED flash string to 150mA from a single Lithium-Ion battery. The board is set up to obtain 20mA backlight current, 40mA preview current and 100mA flash current. All the LED currents can be adjusted by resistors RS1, RS2, and RS3 on the evaluation board. The MP1529 switches at 1.2MHz and allows the use of tiny, low cost capacitors and small inductors. High frequency PWM dimming is made possible through EN1. The MP1529 includes built-in open-LED over-voltage protection, cycle-by-cycle current limit, overtemperature shutdown, input under-voltage control and integrated soft-start. FEATURES * * * * * * * * * * * * High Efficiency 2.7V to 4.2V Input Voltage Range Tiny Capacitors and Inductors Due to 1.2MHz Fixed Frequency Operation LCD Backlight to 30mA, Flash to 150mA Independent Backlight, Preview and Flash Current Adjustment High Frequency PWM Dimming Surface-Mount Components Fully Assembled and Tested PDAs Cellular Phones Digital Still Cameras Digital Video Cameras APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Supply Voltage LED Current (Backlight) LED Current (Preview) LED Current (Flash) Symbol VIN ILED_BL ILED_PV ILED_FL Value 2.7-4.2 20 40 100 Units V mA mA mA "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. EV1529DR-00A EVALUATION BOARD (L x W x H) 2.2" x 1.8" x 0.4" (5.5cm x 4.8cm x 1.0cm) Board Number EV1529DR-00A EV1529DR-00A Rev. 1.0 11/2/2005 MPS IC Number MP1529DR 1 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. TM EV1529DR-00A - FIXED FREQUENCY CONVERTER LCD BACKLIGHT EV BOARD EVALUATION BOARD SCHEMATIC VIN GND U1 MP1529 1 16 15 14 13 12 11 10 9 D1 1N5819HW-7 VOUT VCC PGND SW PGND EN1 EN2 COMP SS OUT ISET3 ISET2 ISET1 VIN 2 3 LED1 LED5 LED9 GND EN1 GND R1 NS R2 NS R3 NS C3 NS VIN 4 LED3 GND LED2 LED1 5 6 7 8 LED2 LED6 LED10 C4 10nF LED3 LED7 LED11 EN2 GND LED4 LED8 LED12 EV1529_S01 EV1529DR-00A BILL OF MATERIALS Qty 1 1 1 1 1 1 1 Ref C1 C2 C3 C4 C5 D1 L1 LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12 R1, R2, R3 RS1 RS2 RS3 U1 10nF 1F 10H Value 10F 2.2F Description Ceramic Capacitor, 10V, X5R Ceramic Capacitor, 25V, X7R Do Not Stuff Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 25V, X5R Diode Schottky, 40V, 1A Inductor, 1.8A Package Manufacturer Manufacturer P/N 1210 1210 TDK TDK C3225X5R1A106K C3225X7R1E225M 0805 0805 SOD123 SMD TDK TDK Diodes Inc. Coiltronics C2012X7R1H103K C2012X5R1E105K 1N5819HW-7 SD25-100 12 Not Stuffed 3 1 1 1 1 Not Stuffed 57.6k Resistor, 1% 33.2k Resistor, 1% 12.1k Resistor, 1% Step-Up Converter 0603 0603 0603 QFN16 Any Any Any MPS MP1529DR EV1529DR-00A Rev. 1.0 11/2/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV1529DR-00A - FIXED FREQUENCY CONVERTER LCD BACKLIGHT EV BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer EV1529DR-00A Rev. 1.0 11/2/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 TM EV1529DR-00A - FIXED FREQUENCY CONVERTER LCD BACKLIGHT EV BOARD 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 Off Backlight Backlight plus Preview Flash EN1 L H (PWM) H (PWM) L EN2 L L H H Strings 1+2: LCD Backlight LEDs Off On (PWM) On (PWM) Off String 3: Flash LEDs Off Off Preview current 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. RS1 = RS2 = RS3 = 950 x VSET ILED _ BL 1100 x VSET ILED _ PV 1000 x VSET ILED _ FL For examples, If ILED_BL = 10mA, then RS1 = 950 x 1.216 = 115.52k (Use a 115k 1% resistor) 10 If ILED_PL = 20mA, then RS2 = 1100 x 1.216 = 66.88k (Use a 66.5k 1% resistor) 20 If ILED_FL = 150mA, then RS3 = 1000 x 1.216 = 8.11k (Use a 8.06k 1% resistor) 150 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 11/2/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 |
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