DIODES AL3069 Demonstration Board User Guide

DIODES AL3069 Demonstration Board

General Description

This demonstration board utilizes the AL3069 high-efficiency boost controller with 4-channel current sources for driving WLED backlight. The AL3069 operates over a wide input voltage range from 4.5V to 60V.
The current of 4 channels are simply programmed from 20mA to 400mA with an external resistor. The current matching between each channel is ±0.5% (Typ). Its operating frequency can be adjusted from 0.1MHz to 1MHz, which allows trade-offs between external component size and system efficiency. The AL3069 supports two independent dimming modes: direct PWM dimming and PWM to analog dimming.
The AL3069 features robust protections include cycle by cycle current limit, soft-start, UVLO, programmable OVP, OTP, open/short LED protection, Schottky Diode Short and Open Protection, Inductor Short-Circuit Protection and VOUT Short protection.

Applications

• LCD Monitor
• LCD Display Module
• LCD TV

Key Features

• Input Voltage Range: 4.5V to 60V
• Four High-Precision Current Sources
  • Current Matching ±0.5% (typical)
  • LED String Current up to 250mA per Channel, 400mA Pulse Current
• Low Ripple for Low BOM Cost
• 6KV HBM ESD Class
• High Voltage Pins CS and OVP for Safety Test
• Supports Direct PWM Dimming and PWM to Analog Dimming
• Minimum PWM Dimming Duty Cycle can be 1/5,000 at 100Hz Dimming Frequency
• Built-in Below Comprehensive Protections
  • Overcurrent Protection (OCP)
  • Overvoltage Protection (OVP)
  • Overtemperature Protection (OTP)
  • Undervoltage Lock Out (UVLO)
  • LED Open/Short Protection
  • Schottky Diode/Inductor Short-Circuit Protection
  • VOUT Short/Schottky Diode Open Protection

Specifications

Connection Instructions

• Power Supply Input: 20VDC (VIN, GND)
• Enable Signal Input: 3.3VDC or 5VDC (EN, GND) PWMD Signal Input: (PWMD, GND)
• PWMA Signal Input: (PWMA, GND)
• LED Outputs: LED+ (Vout+), LED- (CH1~CH4)

Evaluation Board Schematic

Evaluation Board Layout

Quick Start Guide

1. By default, the evaluation board is preset at 120mA LED Current per channel by RISET.
2. Connect the anode wire of external LED string to Vout+ pin.
3. Connect the cathode wire of external LED string to CH1~CH4 pins.
4. Power Supply: Apply 20VDC to Vin & GND pin to supply AL3069
5. Enable the IC: Apply 3.3VDC or 5VDC to EN & GND pin to enable the circuit.
6. Follow the above steps, LED string should light up in non-dimming mode.
7. If you want to enter dimming mode, follow the steps below:
8. Direct PWM dimming:

  * a. Remove the Jumper on J3 (PWMD-VCC)
  * b. Connect PWMA pin to VCC pin by the Jumper on J2 (preset on the board)
  * c. Apply a synchronal PWM signal (Vpp=5V) to J3 PWMD pin to dim the LEDs.
2. PWM to Analog dimming:
  * a. Remove the Jumper on J2 (PWMA-VCC)
  * b. Connect PWMD pin to VCC pin by the Jumper on J3 (preset on the board)
  * c. Apply a synchronal PWM signal (Vpp=5V) to J2 PWMA pin to dim the LEDs.

Bill of Material

R13,R14

| 0805, 1Ω, 1%| 0805| 4
14| R17| 0805, 1kΩ, 1%| 0805| 1
15| R19| 0805, 0Ω, 1%| 0805| 1
16| CE1| SMD, Φ6.38mm, 22uF, 50V, 105℃| Φ6.3| 1
17| CE2| SMD, Φ1010.5mm, 47uF, 100V, 105℃| Φ10| 1
18| C1| 0805, X7R, 10nF, 50V| 0805| 1
19| C2,C3| 0805, X7R, 470nF, 50V| 0805| 2
20| C5,C6| 0805, NP0, 100pF, 50V| 0805| 2
21| C7| 0805, X7R, 2.2uF, 16V| 0805| 1
22| C8| 0805, X7R, 100nF, 50V| 0805| 1
23| C9| 0805, X7R, 220nF, 16V| 0805| 1

System Performance

Test condition: VIN= 20V, VEN=3.3V, VO=40V (13LEDs/CH), ICHX=120mA Efficiency:

Dimming Curve:

Line Regulation ****

Functional Waveforms

Test condition: VIN= 20V, VO=40V (13LEDs/CH)

Thermal Test

Test condition: VIN= 20V, VEN=3.3V, VPWMA= VPWMD =5V, VO=40V (13LEDs/CH), ICHX=120mA, Ta=25℃

Vin(V)| I in (A)| Vout(V)| Iout(A)| Efficiency (%)| Power Mos Temp ( ℃ )| Diode Temp ( ℃ )| IC Temp ( ℃ )
---|---|---|---|---|---|---|---
20| 0.944| 38.12| 0.471| 95.1| 47| 46.2| 55.4

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