IS31BL3506A-TTLS2-EB

IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide Description Recommended Equipment The IS31BL3506A evaluation board features IS31BL3506A, a boost converter LED driver designed for low power backlighting solutions. IS31BL3506A features an integrated MOSFET switch that enables it to drive multiple LED’s in series. The IC regulates the current going through the LED via a set of external, low value sensing resistors. The device adjusts the PWM duty cycle of the switch to maintain a constant 0.3V voltage at the FB pin. Features       Supply voltage range from 2.7V to 5.5V Drive series strings of 9 LEDs PWM or DC voltage dimming Frequency of PWM is 500Hz ~ 500kHz 1.0MHz high speed switching frequency Available in TSOT-23-6 package Quick Start  5.0V, 2A power supply Absolute Maximum Ratings  ≤ 5.5V power supply Caution: Do not exceed the voltage listed above. Doing so may cause damage to the board. Procedure The IS31BL3506A demo board is fully assembled and tested. Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1. Ground the power supply by connecting its ground pin to GND and positive pin to VCC. 2. Alternatively, a power supply may be directly connected to DC IN. 3. Supply power to the board and check the current. If it exceeds 500mA, please check the circuit. If problems arise, contact ISSI. 4. Press bright or dark button to change the current through the LED. 5. The LED intensity spectrum has 32 levels, is controlled by the bright/dark button. Highest intensity (32) corresponds to brightest setting. Figure 1: Photo of IS31LT3506A Evalutaion Board Ordering Information Part No. Temperature Range IC Package IS31BL3506A-TTLS2-EB -40°C to +85°C (Industrial) TSOT-23-6 (3mm x 2mm) Table 1: Ordering Information For pricing, delivery, and ordering information, please contact the ISSI team at analog_mkt@issi.com or (408) 969-6600. Integrated Silicon Solution, Inc. – http://www.issi.com V3, 3/19/2012 1 IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide Evaluation Board Operation The IS31BL3506A evaluation board drives constant output current with PWM dimming control. It utilizes a MCU that generates a PWM signal. A low-pass filter converts the PWM duty cycle signal to a DC voltage at the FB pin, resulting in the corresponding change in LEDs current. The current level is displayed on the Dual Digit Display. Software Support Please refer to the integrated software program that comes with the evaluation board. F R11 R12 6 7 a 3 1uF Seg2 9 10 8 b Seg1 f APM4953 E D C G dp 3V VOUT 5 SD 2 GND BP 4 C10 10nF LDO dp g 5 5 4 S2 VDD GND c G2 C9 DIG1 6 3 S2 d D2 e 4 S1 7 2 G2 U3 VCC 1 3 G1 8 Seg1 2 G1 S1 Seg2 10K 10K D1 A 1 U4 1 B Seg2 Seg1 3V 2281B1 GND VCC D1 L1 VOUT C1 2.2uF B C D E F G dp R13 R14 R15 R16 R17 R18 R19 R20 1K 1K 1K 1K 1K 1K 1K 1K 3V KEY1 KEY2 GND R9 R10 10K 10K P0.0/CMP2/KBI0/AD01 P2.0/ICB/DAC0/AD03 P0.1/CIN2B/KBI1/AD10 P2.1/OCD/AD02 P0.2/CIN2A/KBI2/AD11 P2.2/MOSI P0.3/CIN1B/KBI3/AD12 P2.3/MISO P0.4/CIN1A/KBI4/DAC1/AD13 P2.4/SS P0.5/CMPREF/KBI5 P2.5/SPICLK P0.6/CMP1/KBI6 P2.6/OCA P0.7/T1/KBI7 P2.7/ICA 10K 1 2 13 14 15 16 27 28 18 17 12 11 10 6 5 4 P1.0/TXD P1.1/RXD P1.2/T0/SCL P1.3/INT0/SDA P1.4/INT1 P1.5/RST P1.6/OCB P1.7/OCC/AD00 C5 1uF P3.0XTAL2/CLKOUT P3.1/XTAL1 4 2 C6 0.1uF C7 D2 VSS VDD EN GND GND LX OVP FB D2 ~ D8 1 5 3 R5 0R R4 51K D9 FB R7 IS31BL3506A NC R3 200K R8 15R 9 8 R2 200K 3V VDD U1 GND 6 GND G1 G2 DFLS260 NC GND 3 26 25 24 23 22 20 19 4.7uH C3 0.1uF R1 U2 A C2 0.1uF 21 7 NXP LPC936 C4 0.1uF GND C11 1uF GND GND Figure 2: IS31BL3506A Application Schematic. Please refer to the IS31BL3506A datasheet for additional information. Integrated Silicon Solution, Inc. – http://www.issi.com V3, 3/19/2012 2 IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide Bill of Materials Name Symbol Description Qty Supplier Part No. LED Driver U1 FxLED Boost Converter Driver 1 ISSI IS31BL3506A MCU U2 System Microcontroller 1 NXP P89LPC936 LDO U3 Low-Dropout Regulator 1 PAM PAM3101DAB300 PMOS U4 PMOS 1 Anpec APM4953 Display DIGI Dual Digit Display, Common Anode 1 ZSO 2281BS Diode D1 Schottky Diode, SMD 1 Diodes DFLS260 Diode D2-8 White LED Diode, SMD 7 Everlight EHP-C04/UT01-P01/TR Inductor L1 IND,4.7µH,±20%,SMD 1 Microgate 0805, 4.7µ H Resistor R1,R9-12 RES,10k,1/16W,±5%,SMD 5 - - Resistor R2-3 RES,200k,1/16W,±5%,SMD 2 - - Resistor R4 RES,51k,1/16W,±5%,SMD 1 - - Resistor R5 RES,0Ω,1/16W,±5%,SMD 1 - - Resistor R7 Not Connected 1 - - Resistor R8 RES,15Ω,1/16W,±5%,SMD 1 - - Resistor R13-20 RES,1k,1/16W,±5%,SMD 8 - - Capacitor C1 CAP,2.2µF,16V,±20%,SMD 1 - - Capacitor C2-4,C6 CAP,0.1µF,16V,±20%,SMD 4 - - Capacitor C5,C9,C11 CAP,1µF,16V,±20%,SMD 3 - - Capacitor C7 Not Connect 1 - - Capacitor C10 CAP,10nF,16V,±20%,SMD 1 - - Table 2: Bill of Materials. Refer to Figure 2 for more information. Integrated Silicon Solution, Inc. – http://www.issi.com V3, 3/19/2012 3 IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide 16 16 10 9 8 7 6 2 2 1 2 3 4 1 5 1 1 2 2 2 1 1 3 2 1 1 2 2 16 16 Figure 3: Board Component Placement Guide -Top Layer Figure 4: Board PCB Layout- Top Layer Integrated Silicon Solution, Inc. – http://www.issi.com V3, 3/19/2012 4 IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide 16 16 10 9 8 7 6 2 2 1 2 3 4 1 5 1 1 2 2 2 1 1 3 2 1 1 2 2 16 16 Figure 5: Board Component Placement Guide -Bottom Layer Figure 6: Board PCB Layout-Bottom Layer Integrated Silicon Solution, Inc. – http://www.issi.com V3, 3/19/2012 5 IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances. Integrated Silicon Solution, Inc. – http://www.issi.com V3, 3/19/2012 6