IS31BL3232 FLASH LED DRIVER DESCRIPTION RECOMMENDED EQUIPMENT The IS31BL3232 is a charge pump constant current-regulated LED driver ideal for powering high brightness LEDs for camera flash and torch applications. The charge pump can be set to regulate two current levels for Flash or Torch modes. The IS31BL3232 automatically switches between linear and boost modes; the charge pump will start up automatically to offer a higher output voltage when VFB is lower than the setting value. In the Flash Mode the output will shut down automatically after 1s to save energy. IS31BL3232 provides low cost, space saving solution for driving LED. It also integrates thermal and short circuit protection function. FEATURES Operates from 2.7V to 5.5V Up to 90% efficiency in Torch Mode Output current up to 1.2A(1s) in Flash Mode Adjustable output current in Flash Mode Time out function with 1s for Flash Mode Minimum external components, no external inductor required Automatic boost mode Less than 1µA shutdown current Low ripple and EMI Over voltage protection on output ESD HBM 8kV Short and over temperature protections Available in DFN-10 (3mm × 3mm) package 3.0V~5.0V, 2A power supply ABSOLUTE MAXIMUM RATINGS ≤ 5.5V power supply Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. PROCEDURE The IS31BL3232 evaluation 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) 2) Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. Or connect the DC power to the connector (DC IN). Turn on the power supply and pay attention to the supply current. If the current exceeds 1.5A, please check for circuit fault. EVALUATION BOARD OPERATION The evaluation board is controlled by LPC922 (8051 core). IS31BL3232 evaluation board demonstrates the Flash and Torch modes by switching between modes when the corresponding buttons are pressed. 1) QUICK START 2) Torch Mode (Default): The “Bright+” and “Bright-” buttons are used to control the WLED brightness. The LEDs on the left graphically show the brightness level. The default power on level is D1, the lowest level. The “Torch” button is used to Enable/Disable this mode. Flash Mode: Once pressed the white LEDs will flash ON for one second. SOFTWARE SUPPORT Please refer to the integrated program. Jumper JP1 is closed (default). Remove the jumper on JP1 (on board LPC922 MCU disabled) if you want to use an external MCU control. Connect the external MCU I/O signals to the TP3 connector to directly control the IC’s EN and FLASH input pins. Figure 1: Photo of IS31BL3232 Evaluation Board Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 07/23/2013 Please refer to the datasheet to get more information about IS31BL3232. 1 IS31BL3232 FLASH LED DRIVER ORDERING INFORMATION Part No. Temperature Range Package IS31BL3232-DLS2-EB -40°C ~ +85°C (Industrial) DFN-10, Lead-free Table1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at [email protected] or (408) 969-6600. U1 VCC VDD 3 C1 1uF U2 VCC_3V 1 VOUT 5 C2 10nF SD 2 GND BP 1 20 19 18 17 16 14 13 FLASH EN K3 K4 C3 1uF 4 P0.4 P0.5_LED1 LED2 LED3 LDO JP1 VCC_3V P0.0/CMP2/KBI0/AD01 P0.1/CIN2B/KBI1/AD10 P0.2/CIN2A/KBI2/AD11 P0.3/CIN1B/KBI3/AD12 P0.4/CIN1A/KBI4/DAC1/AD13 P0.5/CMPREF/KBI5 P0.6/CMP1/KBI6 P0.7/T1/KBI7 VDD VCC_3V 15 C4 LED1 1k LED2 VSS 0.1uF 5 R9 10k K1 R10 10k R11 10k K2 R12 10k K3 12 11 10 9 8 4 3 2 K4 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 torch Bright+ Bright- VCC_3V P0.5 P0.4 RST GND 5 4 3 2 1 LED4 P3.0XTAL2/CLKOUT P3.1/XTAL1 LED5 1k LED6 DC IN VCC 1k LED7 TP1 2 1 TP2 C8 10uF FLASH LED8 VCC VOUT D8 R8 0.1uF 4 5 R16 R17 91K 91K C10 VOUT 10 C6 EN R15 91k D7 R7 1k PGND SGND TP3 C5 10uF D6 R6 U3 1 CON1 D5 R5 1k VCC R14 NC D4 R4 1k 7 6 LPC922 ICP R13 NC D3 R3 1k TP6 Flash lamp D2 R2 1k LED3 OPEN=EXT CTRL LED4 LED5 LED6 K1 K2 RST LED7 LED8 D1 VCC_3V R1 FLASH EN FB 2 1uF 3 CP RSET 9 8 R19 R20 NC 1ohm D10 D11 7 FB 6 R18 CN TP4 C7 C9 0.1uF 10uF TP5 27k IS31BL3232 Figure 2: IS31BL3232 Application Schematic Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 07/23/2013 2 IS31BL3232 FLASH LED DRIVER Bill of Materials Name Symbol Description Qty Supplier Part No. LDO U1 Low-dropout regulator 1 PAM PAM3101 MCU U2 Microcontroller 1 NXP LPC922 LED Driver U3 Torch and Flash LED driver 1 ISSI IS31BL3232 Diode D1~D8 Diode, LED Blue, SMD 8 Diode D10~D11 Diode, LED White, peek current 500mA 2 OSRAM LUW C9SN Capacitors C1, C3 CAP,1µF,16V,±20%,SMD 2 Capacitor C2 CAP,10nF,16V,±20%,SMD 1 Capacitors C4, C6, C7 CAP,0.1µF,16V,±20%,SMD 3 Capacitor C5 CAP,10µF,10V,±20%,SMD 1 Capacitors C8, C9 CAP,10µF,10V,±20%,SMD 2 Capacitor C10 CAP,1µF,16V,±20%,SMD 1 Resistors R1~R8 RES,1k,1/16W,±5%,SMD 8 Resistors R9~R12 RES,10k,1/16W,±5%,SMD 4 Resistors R15,R16, R17 RES,91k,1/16W,±5%,SMD 3 Resistor R18 RES,27k,1/16W,±5%,SMD 1 Resistor R20 RES,1R,1/16W,±5%,SMD 1 Resistors R13,R14 ,R19 Not connect 3 Buttons Flash lamp, Torch, Bright-, Bright+ Button SMD 4 Bill of materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 07/23/2013 3 IS31BL3232 FLASH LED DRIVER 0 0 2 1 2 1 2 3 1 1 2 1 2 0 1 2 1 1 2 2 0 0 Figure 3: Board Component Placement Guide -Top Layer Figure 4: Board PCB Layout- Top Layer Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 07/23/2013 4 IS31BL3232 FLASH LED DRIVER 0 0 2 1 2 1 2 3 1 1 2 1 2 0 1 2 1 1 2 2 0 0 Figure 5: Board Component Placement Guide -Bottom Layer Figure 6: Board PCB Layout-Bottom Layer Copyright © 2013 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. – www.issi.com Rev. A, 07/23/2013 5