AL3159FSG WLEDs-EVM

AL3159 Evaluation Module
HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER
Device Features
Description
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The AL3159 is a low noise, constant frequency
charge pump DC/DC converter that uses a dualmode load switch (1x), and (2x) conversion for white
LED applications. The AL3159 is capable of driving
three groups of three LED channels at 20mA from a
2.7V to 5.5V input. The current sinks may be
operated using three simple logic control inputs
individually or in parallel for driving higher current
LEDs. Low external part counts (one 1μF flying
capacitor and two 2.2μF capacitors at VIN and VOUT)
make this part ideally suited for small,
battery-powered applications.
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VIN Range: 2.7V to 5.5V
Up to 93% Max Power Efficiency
1% Current Matching Accuracy Between
Channels
Three Simple Logic Decoding LED On/Off
Control Inputs
Low Transition Threshold Voltage Typical 150 mV
Dual-Mode 1x and 2x Charge Pump
Drives up to 9 Configurable Channels of LEDs
1.2 MHz Constant Switching Frequency
VOUT short circuit and Thermal Protections
Soft Start for Reducing Inrush Current
Under Voltage Lockout Protection
IQ <1μA in Shutdown
Thermally-Enhanced QFN3030-20 Package:
Available in “Green” Molding Compound (No Br,
Sb)
Lead Free Finish/ RoHS Compliant
This evaluation board uses the AL3159’s three digital
inputs to enable and disable the WLED channels.
Each input controls three WLEDs. The digital signals
are generated by an on-board microcontroller.
Ordering Information
Device
Package Code
Packaging
EVM Part Number
AL3159FSG
FS
DFN3030-20
AL3159FSG-EVM Rev.1
AL3159FSG-EVM Rev.1
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AL3159 Evaluation Module
HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER
Schematic
AL3159FSG-EVM Rev.1
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AL3159 Evaluation Module
HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER
PCB Layout
Top Layer Layout of AL3159FSG-EVM Rev.1
Bottom Layer Layout of AL3159FSG-EVM Rev.1
AL3159FSG-EVM Rev.1
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AL3159 Evaluation Module
HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER
Bill of Material
Bill of Material for AL3159FSG-EVM Rev.1
Ref
C1, C3
C2
C4
C5
LED1-9
LED10
LED11
JP1-9
JP10
R1-3
R4-5, 7-9
R6
R10-12
U1
U2
Count
Size
Mfr
2
0603
STD
1
0603
STD
1
1210
STD
1
0805
STD
9
0805
STD
1
0805
STD
1
0805
STD
9
0603
STD
1
0803
STD
1
0603
STD
5
0603
STD
1
0603
STD
3
0603
STD
DFN3030-20 Diodes
1
0
1
QFN6060-28
Microchip
Part Number
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
AL3159SFG
PIC16F1827
Description
2.2 µF/10V ceramic capacitor
1 µF/16V ceramic capacitor
10 µF/10 ceramic capacitor
1 µF/10V ceramic capacitor
White LED
Green LED
Red LED
0 Ω resistor
0 Ω resistor
Not populated
1 kΩ resistor
10 kΩ resistor
100 kΩ resistor
Charge pump WLED driver
8-bit microcontroller
I/O Terminals and Test Points
Terminals and Jumpers for AL3159FSG-EVM Rev.1
I/O and Test Points
Description
Comments
P1 (VIN), P2 (GND)
P3
Power Supply and Ground
Connect to input power supply
Control signal monitoring
Use an o’scope to monitor the control signals
J11
Input Jumper to AL3159
Jumper for connecting VIN to the AL3159
J12
Input Jumper to controller
Jumper for connecting VIN controller circuit
VIN, VOUT
Voltage Test Points
Input and output voltage test points
AL3159FSG-EVM Rev.1
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© Diodes Incorporated
AL3159 Evaluation Module
HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER
Quick Start Guide
1. Insert jumper J11 to connect VIN to the AL3159 and J12 to connect VIN to the onboard controller.
2. Connect a +2.7V~+5.5V power supply between VIN (P1) and GND (P2) headers. Turn on the
power supply. The red power indicator LED (LED11) should be on.
3. The controller will enter State 1, where three control signals are sent to the AL3159 to select the
combination of WLEDs to be turned on. The controller will auto-scan the WLEDs with eight
combinations.
4. In State 1, the green LED (LED10) will be blinking. Pressing the UP and DOWN buttons will
change the rate at which the LED10 blinks and also change the scanning rate of the WLEDs.
5. Press the CYCLE button to move the controller to the next state. Every time the controller enters a
new state between States 2 and 8, the corresponding LED group will be turned on while the other
WLEDs off.
6. Press the CYCLE button while in State 8 will bring the controller back to State 1.
7. Press and hold the CYCLE button at any time will force the controller to enter State 0. In this state,
all WLEDs (LED1-9) will be turned off. So will the green LED (LED10). Press the CYCLE button in
State 0 will change the controller state to State 1.
Table: Controller Machine States
Controller
State
Green LED
(LED10)
0
Off
1
Flashing
2
On
Turn on LED1-2
3
On
Turn on LED3-5
4
On
Turn on LED6-9
5
On
Turn on LED9
6
On
Turn on LED8-6
7
On
Turn on LED5-1
8
On
All WLEDs (LED1-9) are on
AL3159FSG-EVM Rev.1
Description
All WLEDs are turned off
Auto-scanning; UP/DOWN buttons change scanning rate.
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