IS31BL3506A Eval Brd Guide Datasheet by ISSI, Integrated Silicon Solution Inc
View All Related Products | Download PDF Datasheet
analog mthissmom
hItEJ/wwszsioom
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – http://www.issi.com 1
V3, 3/19/2012
Description
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
Figure 1: Photo of IS31LT3506A Evalutaion Board
Recommended Equipment
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.
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.
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – http://www.issi.com 2
V3, 3/19/2012
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.
Figure 2: IS31BL3506A Application Schematic. Please refer to the IS31BL3506A datasheet for additional information.
KEY2
KEY1
R14 1K
R11
10K
R12
10K
R15 1K
R17 1K
R19 1K
R16 1K
R13 1K
R18 1K
D1
1
G1
2
D2
3
G2
4S2 5
S2 6
S1 7
S1 8
U4
APM4953
VDD
1
GND
2
SD
3
BP 4
VOUT 5
U3
LDO
LX 1
GND
2FB 3
EN
4OVP 5
VDD
6
U1
IS31BL3506A
P2.0/ICB/DAC0/AD03 1
P2.1/OCD/AD02 2
P0.0/CMP2/KBI0/AD01
3
P1.7/OCC/AD00
4P1.6/OCB
5P1.5/RST
6
VSS 7
P3.1/XTAL1 8
P3.0XTAL2/CLKOUT 9
P1.4/INT1
10 P1.3/INT0/SDA
11 P1.2/T0/SCL
12
P2.2/MOSI 13
P2.3/MISO 14
P2.4/SS 15
P2.5/SPICLK 16
P1.1/RXD
17 P1.0/TXD
18
P0.7/T1/KBI7
19 P0.6/CMP1/KBI6
20
VDD 21
P0.5/CMPREF/KBI5
22 P0.4/CIN1A/KBI4/DAC1/AD13
23 P0.3/CIN1B/KBI3/AD12
24 P0.2/CIN2A/KBI2/AD11
25 P0.1/CIN2B/KBI1/AD10
26
P2.6/OCA 27
P2.7/ICA 28
U2
NXP LPC936
f10
e
1
d
2
c
3
g
4
dp
5Seg2 6
a7
b8
Seg1 9
DIG1
2281B1
C1
2.2uF
C6
0.1uF
C4
0.1uF
C9
1uF
C2
0.1uF
C5
1uF
C10
10nF
C11
1uF
L1
4.7uH
D1
DFLS260 D2
D2 ~ D8
D9
3V
GND
R4 51K
R8
15R
R1
10K
R7
NC
R3
200K
GND
GND
VCC
GND
GND
R2
200K
R20 1K
GND
GND
VCC
GND
3V
VOUT
FB
R9
10K
R10
10K
3V
GND
3V
dp
AB
CDEG
F
F
G
Seg1
Seg2
Seg1 Seg2
G1
G2
G1
G2
A
B
C
D
E
dp
C3
0.1uF
GND
R5 0R
C7
NC
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – http://www.issi.com 3
V3, 3/19/2012
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.
m wwszsicom
ISSlBL3506A_EB_V01A
hngJ/www. my ,cum
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – http://www.issi.com 4
V3, 3/19/2012
Figure 3: Board Component Placement Guide -Top Layer
Figure 4: Board PCB Layout- Top Layer
16
16 16
16
1
1
2
1
3
2
12
1
2
1
2
12
2
2
12345
10 9876
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – http://www.issi.com 5
V3, 3/19/2012
Figure 5: Board Component Placement Guide -Bottom Layer
Figure 6: Board PCB Layout-Bottom Layer
16
16 16
16
1
1
2
1
3
2
12
1
2
1
2
12
2
2
12345
10 9 8 7 6
IS31BL3506A Boost LED Backlight Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – http://www.issi.com 6
V3, 3/19/2012
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.
Products related to this Datasheet
EVAL BOARD FOR IS31BL3506A-TTLS2