RICHTEK RT5753AHGQW Evaluation Board Instruction Manual
- June 28, 2024
- RICHTEK
Table of Contents
RICHTEK RT5753AHGQW Evaluation Board Instruction Manual
General Description
The Evaluation Board demonstrates that the RT5753AH is designed for a 1.2V/3A output from a 2.5V to 6V input at a 1.2MHz switching frequency. This user’s guide includes setup instructions for the hardware, a printed circuit board (PCB) layout for the EVB, a schematic diagram, a bill of materials, and test results for the EVB.
Performance Specification Summary
A summary of the RT5753AH Evaluation Board performance specification is provided in Table 1. The ambient temperature is 25°C.
Table 1. RT5753AH Evaluation Board Performance Specification Summary
Specification| Test Conditions| Min| Typ| Max|
Unit
---|---|---|---|---|---
Input Voltage Range| | 2.5| —| 6| V
Output Current| | 0| —| 3| A
Default Output Voltage| | —| 1.2| —| V
Operation Frequency| | —| 1.2| —| MHz
Output Ripple Voltage| IOUT = 1.5A| —| 5| —| mVp-p
Line Regulation| IOUT = 1.5A, VIN = 2.5V to 6V| —| ±1| —| %
Load Regulation| VIN = 3.6V, IOUT = 0A to 3A| —| ±1| —| %
Load Transient Response| IOUT = 1.5A to 3A| —| ±5| —| %
Peak Efficiency| VIN = 3.6V, VOUT = 1.2V| —| 89.2| —| %
Power-up Procedure
Suggestion Required Equipments
- RT5753AH Evaluation Board
- DC power supply capable of at least 6V and 3A
- Electronic load capable of 5A
- Function Generator
- Oscilloscope
Quick Start Procedures
The Evaluation Board is fully assembled and tested. Follow the steps below
to verify board operation. Do not turn on supplies until all connections are
made. When measuring the output voltage ripple, care must be taken to avoid a
long ground lead on the oscilloscope probe. Measure the output voltage ripple
by touching the probe tip and ground ring directly across the last output
capacitor.
Proper measurement equipment setup and follow the procedure below.
- With power off, connect the input power supply to VIN and GND pins.
- With power off, connect the electronic load between the VOUT and nearest GND pins.
- Turn on the power supply at the input. Make sure that the input voltage does not exceeds 6V on the Evaluation Board.
- Check for the proper output voltage using a voltmeter.
- Once the proper output voltage is established, adjust the load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency and other performance.
Detailed Description of Hardware
Headers Description and Placement
Carefully inspect all the components used in the EVB according to the
following Bill of Materials table, and then make sure all the components are
undamaged and correctly installed. If there is any missing or damaged
component, which may occur during transportation, please contact our
distributors or e-mail us at
evb_service@richtek.com.
Test Points
The EVB is provided with the test points and pin names listed in the table
below.
| Test Point/ Pin Name | Function |
|---|---|
| VIN | Input voltage. |
| VOUT | Output voltage. |
| GND | Ground. |
| EN | Enable test point. |
| JP1 | EN jumper. Connect EN to the ground to disable and EN to VIN to |
enable.
LX| Switch node test point.
JP2| Measure the VOUT waveform and output regulation.
PGOOD| Power-good indication test point.
Bill of Materials
Reference| Count| Part Number| Value| Description|
Package| Manufacturer
---|---|---|---|---|---|---
U1| 1| RT 5753 AH GQW| RT 5753AH| Step-Down Converter| WDFN-10 SL 3×3| RICHTER
C2, C3, C4| 3| G R M 188R60J226MEA0| 22µF| Capacitor, Ceramic, 6.3 V, X5R|
0603| MURAT A
C1| 1| 0603N220J500 CT| 22pF| Capacitor, Ceramic, 50V, X7R| 0603| WAL SIN
C6, C7| 2| 0603 B104 K500CT| 0.1µF| Capacitor, Ceramic, 16V, X7R| 0603| WAL
SIN
L1| 1| DFE 322512F-1R0M| 1µH| Inductor, Isat = 4.8A, 32mΩ| 3.2x 2.5×1.2mm|
MURATA
R1, R2, R3, R4| 4| WR 06X1003 FTL| 100k| Resistor, Chip, 1/10W, 1%| 0603| WAL
SIN
R5| 1| WR 06X000 PTL| 0| Resistor, Chip, 1/10W, 5%| 0603| WAL SIN
Typical Applications
EVB Schematic Diagram
- The capacitance values of the input and output capacitors will influence the input and output voltage ripple.
- MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance.
Measure Result
- Output Ripple Measurement
Time (500ns/Div)
- Output Ripple Measurement
Time (50µs/Div)
- **Power On from EN
** Time (1ms/Div)
- **Power Off from EN
** Time (20µs/Div)
- **Load Transient Response
** Time (20µs/Div)
-
Load Transient Response
Time (20µs/Div) -
Short Circuit Response – Short and Recovery
-
Efficiency vs. Output Current
Output Current (A) -
Output Voltage vs. Output Current
Output Current (A) -
Output Voltage vs. Input Voltage
Input Voltage (V) -
Loop Response
-
Thermal Image at
VIN = 3.6V, VOUT = 1.2V, IOUT = 3A
Note: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the output capacitor.
Evaluation Board Layout
Figure 1 to Figure 4 are RT5753AH Evaluation Board layout. This board size is
70mm x 50mm and is constructed on four-layer PCB, outer layers with 2 oz. Cu
and inner layers with 1 oz. Cu.
Figure 1. Top View (1st layer)
Figure 2. PCB Layout—Inner Side (2nd Layer)
Figure 3. PCB Layout—Inner Side (3rd Layer)
Figure 4. Bottom View (4th Layer)
More Information
For more information, please find the related datasheet or application notes from Richtek website : http://www.richtek.com.
Important Notice for Richtek Evaluation Board
THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE TO BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES.
References
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