IS31BL3506A-TTLS2-EB
IS31BL3506A-TTLS2-EB Datasheet
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
| Part | Datasheet |
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IS31BL3506A-TTLS2-EB |
IS31BL3506A-TTLS2-EB (pdf) |
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| IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide 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. • 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. Ground the power supply by connecting its ground pin to GND and positive pin to VCC. Alternatively, a power supply may be directly connected to DC IN. Supply power to the board and check the current. If it exceeds 500mA, please check the circuit. If problems arise, contact ISSI. Press bright or dark button to change the current through the LED. 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 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 or 408 Integrated Silicon Solution, Inc. V3, 3/19/2012 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. 3V R11 R12 10K 1 D1 2 G1 3 D2 4 G2 S1 8 S1 7 S2 6 S2 5 APM4953 Seg1 Seg2 10 9 Seg1 DIG1 a7 Seg2 6 f Seg1 1e 2d 3c 4g 5 dp 2281B1 E D C G dp Seg2 A R13 1K B R14 1K C R15 1K D R16 1K E R17 1K F R18 1K G R19 1K dp R20 1K R9 R10 KEY1 10K KEY2 3 26 25 24 23 22 20 19 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 |
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