ALLEGRO APEK80800 Evaluation Board User Guide
- June 1, 2024
- ALLEGRO
Table of Contents
ALLEGRO APEK80800 Evaluation Board
Product Information
Specifications
- Part Number: APEK80800KLP-01-T
- Output Current: Selectable (1 A or 1.5 A)
- Absolute Maximum Input Voltage: 60 V
- Operating Input Voltage Range: 4.5 V to 55 V
- LED Regulation Current: 100 mA to 300 mA
- Enable Input: VCC, ADIM, TON, FDSET, FFn, PWM
Product Usage Instructions
Using the Evaluation Board
- To start using the evaluation board, connect the power supply, cables, and LED string as indicated in the setup diagram.
- To enable the ALT80800, short header P1 with a jumper, or apply a voltage between 1.8 V and VIN to the EN test point.
Configuring the Evaluation Board
- The regulation LED current level is determined by the current sensing resistor on the evaluation board.
FAQ
- Q: How can I adjust the output current of the ALT80800 Evaluation Board?
- A: The output current can be easily configured to either 1 A or 1.5 A by following the instructions provided in the user manual.
- Q: What is the maximum forward voltage drop of the driven LED string?
- A: The maximum forward voltage drop of the driven LED string is limited by VIN.
DESCRIPTION
- The ALT80800 Evaluation Board is designed to help system designers evaluate the operation and performance of the ALT80800 2.0 A synchronous buck LED driver.
- The regulated output current is easily configurable to 1 A or 1.5 A, with additional control by applying external analog dimming (ADIM) and/or PWM signals.
- The maximum forward voltage drop of the driven LED string is limited by VIN.
FEATURES
- ALT80800 2.0 A Synchronous Buck LED Driver
- User-selectable Enable, LED current, Fault pull-up to VCC and ADIM pull-up to VCC
- Optional ADIM and PWM inputs for additional LED current-level control
Table 1: ALT80800 Evaluation Board Configurations
| Configuration Name | Part Number | Output Current |
|---|---|---|
| ALT80800 | APEK80800KLP-01-T | Selectable (1 A or 1.5 A) |
Table 2: General Specifications
General Specifications
| Specification | Min | Nom | Max | Units |
|---|---|---|---|---|
| Absolute Maximum Input Voltage | –0.3 | – | 60 | V |
| Operating Input Voltage Range | 4.5 | – | 55 | V |
| VIN START Threshold, VIN rising | – | – | 4.3 | V |
| VIN UVLO Hysterisis | 100 | – | 300 | mA |
| LED regulation current | – | – | 2 | A |
| Enable Input | –0.3 | – | VIN+0.3 | V |
| pin VCC, ADIM, TON, FDSET, FFn, PWM | –0.3 | 7 | V |
USING THE EVALUATION BOARD
- Figure 2 illustrates the basic setup of the evaluation board.
- To start using the evaluation board, connect the power supply, cables and LED string as indicated in Figure 2. The ammeters and voltmeters are not required for operation.
- To enable the ALT80800, short header P1 with a jumper, or apply a voltage between 1.8 V and VIN to the EN test point.
Configuring the Evaluation Board
-
The regulation LED current level is determined by the current sensing resistor on the evaluation board, demonstrated by the following equation:
On the evaluation board, there are two current sensing resistors, designated Rs1 and Rs2, with measurements of 0.2 Ω and 0.39 Ω respectively. When connector P4 is open, current sensing resistance is 0.2 Ω, resulting in a 1 A regulation current; when P4 is shorted, current sensing resistance becomes 0.13 Ω, resulting in a 1.5 A regulation current. -
If analog dimming is desired, leave connector P2 open and apply an appropriate voltage to the ADIM test point. If analog dimming is unused, short connector P2, which ties ADIM to VCC, commanding full LED current. Do not leave the ADIM test point floating with connector P2 open.
EVALUATION BOARD PERFORMANCE DATA Efficiency
ADIM Performance
SCHEMATIC
LAYOUT
BILL OF MATERIALS
Table 3: ALT80800 Evaluation Board Bill of Materials
ELECTRICAL COMPONENTS
Designator| Quantity| Description| Manufacturer|
Manufacturer Part Number
PCB| 1| ALT80800 EVAL PCB, Rev 1| Allegro MicroSystems|
U1| 1| ALT80800| Allegro MicroSystems|
| | | |
RS1| 1| Resistor, 0.2 Ω, 1/2 W, 1%| Susumu| RL1632R-R200-F
RS2| 1| Resistor, 0.39 Ω, 1/2W, 1%| Susumu| RL1632R-R390-F
R1, R2| 2| Resistor, 187 kΩ, 1/10W, 1%| |
R3| 1| Resistor, 100 kΩ, 1/10 W, 1%| |
RON| 1| Resistor, 178 kΩ, 1/10 W, 1%| |
RADJ| 1| Resistor, 0 Ω, 1/10 W| |
RPU| 1| Resistor, 10 kΩ, 1/10 W, 1%| |
| | | |
CBOOT| 1| Capacitor, Ceramic, 0.47 µF, 50 V, 10%, X7R| TDK|
CGA3E3X7R1H474K080AE
C1| 1| Capacitor, Ceramic, 0.1 µF, 50 V, 10%, X7R| Murata| GRM188R71H104KA93D
C2| 1| CAP CER 2.2 µF 50 V X7R| TDK| C2012X7R1H225M125AC
CV1, CL1| 2| CAP CER 0.1 µF 100 V X7R 0805| Murata TDK| GCM21BR72A104KA37L
CGA4J2X7R2A104M125AA
| | | |
RSNB, CSNB, CL2| 0| EMPTY| |
CIN1| 1| Capacitor, 33 μF, 63 V, Elect HXA SMD| United Chemi-Con|
HHXA630ARA330MHA0G
CIN2| 1| Capacitor, Ceramic, 4.7 μF, 100 V, 20%, X7S| TDK| C3225X7S2A475M200AB
CIN3| 1| Capacitor, Ceramic, 0.1 uF, 100 V, 20%, X7S| TDK|
CGA3E3X7S2A104M080AB
CIN4| 1| Capacitor, Ceramic, 100 pF, 100 V, 5%, COG| |
| | | |
D1| 1| DIODE SCHOTTKY 60 V 1 A SMA| Vishay| VS-10MQ060NTRPBF
D2| 1| DIODE SCHOTTKY 60 V 1 A SMA| Vishay| VS-10MQ060NTRPBF
D3| 0| Empty| |
L1 (FSW = 500
Khz)
| ****
1
| ****
Inductor, 33 µH, IR=4.2 A, ISAT=5.5 A, 45 mΩ
| ****
Wurth Electronics
| ****
7447709330
| | | |
VIN, LED+| 2| Test Points, Red, 0.063″ diameter| Keystone| 5010
EN, PWM, VCC, FAULT, ADIM,
CSH, BOOT, SW, VCCIN
| ****
9
| ****
Test Points, White, 0.063″ diameter
| ****
Keystone
| ****
5012
GND| 7| Test Points, Black, 0.063″ diameter| Keystone| 5011
P1, P2, P3| 3| Header, Male, 2 position (shorting 1 & 2)| Sullins| PEC36SAAN
P4| 1| Header, Male, 2 position (open)| Sullins| PEC36SAAN
OTHER COMPONENTS
Designator| Quantity| Description| Manufacturer|
Manufacturer Part Number
Rubber Feet| 4| Self-stick rubber feet| 3M| SJ-5303 (CLEAR)
| | | |
PCB LABEL:| | ALT80800 500 kHz| |
RELATED LINKS
Revision History
| Number | Date | Description |
|---|---|---|
| – | May 19, 2023 | Initial release |
Copyright 2023, Allegro MicroSystems
- Allegro MicroSystems reserves the right to make, from time to time, such departures from the detailed specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current.
- Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.
- The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use.
- Copies of this document are considered uncontrolled documents.
CONTACT
- Allegro MicroSystems
- 955 Perimeter Road
- Manchester, NH 03103-3353 U.S.A.
- www.allegromicro.com.