IS31BL3506B 1.0MHZ BOOST CONVERTER WITH 35V INTERNAL MOSFET SWITCH

Transcription

1 ISBL0B.0MHZ BOOST CONVERTER WITH V INTERNAL MOSFET SWITCH DESCRIPTION ISBL0B is a boost converter featuring an integrated MOSFET switch designed for driving series strings of LED or other device. Input operating voltage range is.v~.v. The device regulates the LED load current is set using an external, low value sensing resistor. The device adjusts the duty cycle of the switch to maintain the voltage at the FB pin at a value of 0.V. The ISBL0B operates at a constant switching frequency of.0mhz to allow for small component size. ISBL0B features an over voltage shutdown pin which prevents the output voltage from exceeding V (typ.) in the case of an open circuit condition. FEATURES Supply voltage:.v~.v Built-in soft start Drive series strings of LEDs or DC voltage dimming Frequency of is 00Hz ~ 00kHz.0MHz high speed switching frequency 00mV feedback voltage Integrated high power MOSFET Over voltage protection -0 C ~ + C working temperature range SOT- package QUICK START Figure : Photo of ISBL0B Evaluation Board RECOMMDED EQUIPMT.0V, A power supply ABSOLUTE MAXIMUM RATINGS.V power supply Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. PROCEDURE The ISBL0B evaluation board is fully assembled and tested. Follow the below steps to verify operation. Caution: Do not turn on the power supply until all connections are completed. ) Connect the Power Supply ground terminal to the PCB GND input pin and the positive terminal to the PCB input pin. Or connect a V wall-mount DC power out plug (center power) to the PCB connector (CON / DC IN). ) Turn on the power supply and pay attention to the supply current. If the current exceeds A, please check for circuit fault. EVALUATION BOARD OPERATION The WLED light intensity is adjusted by the onboard MCU (LPC9) which generates a signal to the ISBL0B pin. There are intensity levels with the lowest set as the power on default. Pressing the Level+ key will increase the intensity level while pressing the Level- key will decrease the level. The -segment LED (DIG) will show the corresponding light intensity level. The SD/ key is used to toggle between shutdown and enable modes. The LED+ and LED- are test points to monitor the output voltage. LED CURRT SETTING When the ISBL0B is used for LED driving applications, the LED current flows through external feedback resistors R and R to regulate the LED current. The internal feedback regulation point is 0.V. The max current is calculated by the following: I / MAX VFB RSET and R R / R SET (R =Ω if zero ohm resistor used). For accurate LED current, resistors should be % or better tolerance. SOFTWARE SUPPORT JP is connected by default. Open it to disable the onboard MCU which will place the ISBL0B pin in High impedance. An external driving signal can then be connected to TP connector to control the ISBL0B LED driver. Please refer to the SW program for LPC9 code example. Please refer to the datasheet to get more information about ISBL0B. Integrated Silicon Solution, Inc. Rev. A, 0//0

2 ISBL0B.0MHZ BOOST CONVERTER WITH V INTERNAL MOSFET SWITCH ORDERING INFORMATION Part No. Temperature Range Package ISBL0B-STLS-EB -0 C ~ + C (Industrial) SOT-, Lead-free Table: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI s analog marketing team at analog@issi.com or (0) C uf R 00K CON DC IN R 00K 0 U D D G G f e F U 9 d E Seg VDD SD GND LDO G G Seg APM9 TP TP c D b B C a g VOUT BP S S S S C 0uF A dp G Seg Seg dp DIG BS C 0nF Seg Seg C 0.uF V C uf R 00K SD/ Level+ OP=EXT CTRL TP TP ICP U GND K K K JP L uh ISBL0B R D DFLS0 R 0R R C C uf/0v R 0R R U A B K K R R P0.0 P0. V P0. C K R P0. P0. D K RST R P0. GND P0. P0. R9 F K P0. P0. R0 E K G K 0 R P0. V dp K 9 P0. R 00K LX OUT R0 00K R9 00K Figure : ISBL0B Application Schematic FB R 00K R 0R 0 P.0 C P./T0/SCL P./INT0/SDA P./INT LPC9 TP R VDD P. P. P. P. P. P. P. P.0 P. P./RXD RST/P. TXD/P.0 P. P. VSS TP LED+ D ~ D0 Level- LED- 9 V G G RST Integrated Silicon Solution, Inc. Rev. A, 0//0

3 ISBL0B.0MHZ BOOST CONVERTER WITH V INTERNAL MOSFET SWITCH BILL OF MATERIALS Name Symbol Description Qty Supplier Part No. LED Driver U FxLED boost converter driver ISSI ISBL0B LDO U Low-dropout regulator PAM PAM0 MCU U Microcontroller NXP LPC9 PMOS U Dual PMOS ANPEC APM9 Display DIG Dual digit display common anode ZSO BS Diode D Schottky Diode, SMD DFLS0 Diode D~D0 Diode, LED White, SMD 9 Everlight EHP-C0/UT0- P0/TR Inductor L IND,µH±0%,SMD Murata µh,ind Resistor R RES,0R,/W,±%,SMD Resistors R,R RES,0R,/W,±%,SMD R,R,R,C,C Not Connect Resistors R~R RES,00k,/W,±%,SMD Resistors R~R RES,k,/W,±%,SMD Capacitor C CAP,0µF,V,±0%,SMD Capacitors C CAP, 0.µF,V,±0%,SMD Capacitors C,C,C CAP,µF,0V,±0%,SMD Capacitor C CAP,0nF,V,±0%,SMD Buttons K~K Buttons SMD Bill of materials, refer to Figure above. Integrated Silicon Solution, Inc. Rev. A, 0//0

4 0 ISBL0B.0MHZ BOOST CONVERTER WITH V INTERNAL MOSFET SWITCH 0 9 Figure : Board Component Placement Guide -Top Layer Figure : Board PCB Layout- Top Layer Integrated Silicon Solution, Inc. Rev. A, 0//0

5 0 ISBL0B.0MHZ BOOST CONVERTER WITH V INTERNAL MOSFET SWITCH 0 9 Figure : Board Component Placement Guide -Bottom Layer Figure : Board PCB Layout-Bottom Layer Copyright 0 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. Rev. A, 0//0