DIODES AP65111A DC Buck Converter Owner’s Manual
- July 4, 2024
- DIODES
Table of Contents
AP65111AWU-EVM
500kHz, 18V, 1.5A, Current Mode, DCM/CCM
Synchronous DC/DC Buck Converter in TSOT26
Description
The AP65111A is a 500kHz switching frequency internal compensated synchronous DC/DC buck converter. It has integrated low RDSON high and low side MOSFETs.
The AP65111A enables continuous load current of up to 1.5A with efficiency as high as 97%.
The AP65111A implements an automatic custom light load efficiency improvement algorithm.
The AP65111A features current mode control operation, which enables fast transient response times and easy loop stabilization.
The AP65111A simplifies board layout and reduces space requirements with its high level of integration and minimal need for external components, making it ideal for distributed power architectures.
The AP65111A is available in a standard Green TSOT26 package and is RoHS compliant.
- Gaming Consoles
- Flat Screen TV Sets and Monitors
- Set Top Boxes
- Distributed Power Systems
- Green Electronics
- Home Audio
- Consumer Electronics
- Network Systems
- FPGA, DSP and ASIC Supplies
Performance Spec of AP65111AWU-EVM (Rev1)
| Parameter | Conditions | Performance Value |
|---|---|---|
| Input Voltage | Range 4.5V to 18V | 12V |
| Output Current | 1.5A | |
| Output Voltage | 3.3V | |
| Transient Response | Peak-to-peak load step from 0.75A to 1.5A | 100mVP-P |
| Switching Frequency | 500kHz | |
| Efficiency | 92% |
Figure 1. Evaluation Board (Rev1)
Figure 2. Load Transient 0.75 to 1.5A
Figure 3. Efficiency (VOUT=3.3V)
Figure 4. Efficiency (VOUT=5.0V)
PCB Layouts
Top Layer
Bottom Layer
Quick Start Guide
The AP65111AWU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP65111A, follow the procedure below:
- Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
- Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
- EN has a positive voltage through a 100K pull-up to VIN. No supply input is required for EN.
- The evaluation board should now power up with a 3.3V output voltage.
- Check for the proper output voltage of 3.3V (±1%) at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT and GND.
- Set the load to 1.5A through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency.
Measurement/Performance Guidelines:
-
When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high frequency noise into the measured ripple.
-
For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current.
EVALUATION BOARD SCHEMATIC
BILL OF MATERIALS
Ref| Value| Description| Qty| Size| Vendor Name|
Manufacturer PN
---|---|---|---|---|---|---
C1, C2| 22µF| Ceramic Capacitor, 25V, X5R| 1| 1210| AVX| 12103D226KAT2A
C3| 1µF| Ceramic Capacitor, 16V, X7R, 10%| 1| 0805| Kemet| C0805C105K4RACTU
C4| 0.1µF| Ceramic Capacitor, 25V, X7R, 10%| 1| 0805| Samsung| CL21B104KACNNNC
L1| 6.5µH| DCR=12.5mΩ, Is=10A| 1| 10X10X5 mm| Wurth Electronics| 744325650
R1| 40.2KΩ| Film Resistor, 1%| 1| 0805| Panasonic| ERJ-6ENF4022V
R2| 13KΩ| Film Resistor, 1%| 1| 0805| Panasonic| ERJ-6ENF1302V
R3| 59KΩ| Film Resistor, 1%| 1| 0805| Panasonic| ERJ-6ENF5902V
R4| 0Ω| Film Resistor, 1%| 1| 0805| Panasonic| ERJ-6GEY0R00V
R7| 100KΩ| Film Resistor, 1%| 1| 0805| Panasonic| ERJ-6ENF1003V
T1| 1598| Terminal Turret Triple 0.094″ L (Test Points)| 5| | Keystone
Electronics| 1598-1
U1| | DC/DC converter | 1| TSOT26| Diodes| AP65111AWU
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Copyright © 2017, Diodes Incorporated
AP65111AWU-EVM
Document number: Rev. 1.0
December 2017
© Diodes Incorporated
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