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RTQ6361GSP, 60VIN, 1.5A, Asynchronous Step-Down Converter Evaluation Board

EVB_RTQ6361GSP

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The Evaluation Board demonstrates the RTQ6361GSP to be designed for a 5V/1.5A output from a 8V to 60V input at 500kHz switching frequency. The wide input range makes it suitable for communications and industrial 12V, 24V and 48V power systems. The RTQ6361GSP provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection and thermal shut down. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up.

General Description

The Evaluation Board demonstrates the RTQ6361GSP to be designed for a 5V/1.5A output from a 8V to 60V input at 500kHz switching frequency. The wide input range makes it suitable for communications and industrial 12V, 24V and 48V power systems. The RTQ6361GSP provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection and thermal shut down. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up.


Performance Sepcification Summary

Summary of the RTQ6361GSP Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.

Table 1. RTQ6361GSP Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

8

--

60

V

Output Current

0

--

1.5

A

Default Output Voltage

--

5

--

V

Operation Frequency

--

500

--

kHz

Output Ripple Voltage

IOUT = 1.5A

--

10

--

mVp-p

Line Regulation

IOUT = 1.5A, VIN = 8V to 60V

--

±1

--

%

Load Regulation

VIN = 12V, IOUT = 0.001A to 1.5A

--

±1

--

%

Load Transient Response

IOUT = 0.75A to 1.5A

--

±5

--

%

Maximum Efficiency

VIN = 12V, VOUT = 5V, IOUT = 1.5A

--

88.9

--

%



Power-up Procedure

Suggestion Required Equipments

  • RTQ6361GSP Evaluation Board
  • DC power supply capable of at least 60V and 2A
  • Electronic load capable of 6A
  • 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.

1) With power off, connect the input power supply to VIN and GND pins.

2) With power off, connect the electronic load between the VOUT and nearest GND pins.

3) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 60V on the Evaluation Board.

4) Check for the proper output voltage using a voltmeter.

5) 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

Technical Document Image Preview

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.

J3

EN jumper. Connect EN to ground to disable, open to enable.

SW

Switch node test point.

V2

Test pin V2 is used for bode plot measurement. Connect VOUT pin and this pin to the injection transformer.



Bill of Materials

VIN = 12V, VOUT = 5.0V, IOUT = 1.5A, fSW = 500kHz

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U1

1

RTQ6360GSP

RTQ6360GSP

Step-Down Converter

SOP-8

(Exposed pad)

RICHTEK

C3, C4

2

GRM31CR72A225KA73L

2.2µF

Capacitor, Ceramic, 100V, X7R

1206

MURATA

C5

1

0603B182K500CT

1.8nF

Capacitor, Ceramic, 50V, X7R

0603

WALSIN

C6

1

0603N180J500CT

18pF

Capacitor, Ceramic, 50V, NPO

0603

WALSIN

C7

1

GRM32ER61C476KE15L

47µF

Capacitor, Ceramic, 16V, X5R

1210

MURATA

C11

1

0603B104K500CT

0.1µF

Capacitor, Ceramic, 50V, X7R

0603

WALSIN

CBOOT

1

0603B104K500CT

0.1µF

Capacitor, Ceramic, 50V, X7R

0603

WALSIN

D1

1

SS26

Schottky Diode, 60V/2A

Schottky Diode, 60V/2A

SMB

ON Semiconductor

L1

1

ETQP3M150KVN

15µH

Inductor, Isat = 5.1A, 99.2mΩ

Panasonic

R1

1

WR06X5232FTL

52.3k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R2

1

WR06X1002FTL

10k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R3

1

RTT031693FTP

56k

Resistor, Chip, 1/10W, 1%

0603

RALEC

R7, RBOOT

2

WR06X000 PTL

0

Resistor, Chip, 1/10W, 1%

0603

WALSIN

RT

1

RTT032323FTP

232k

Resistor, Chip, 1/10W, 1%

0603

RALEC



Typical Applications

EVB Schematic Diagram

Technical Document Image Preview

1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple.

2. 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

Load Transient Response

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Power On from EN

Power Off from EN

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Short Circuit Response – Short and Recovery

Start-Up Dropout Performance

Technical Document Image Preview

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Efficiency vs. Output Current

Output Voltage vs. Output Current

Technical Document Image Preview

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Output Voltage vs. Input Voltage

Loop Response

Technical Document Image Preview

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Thermal Image at VIN = 12V, VOUT = 5V, IOUT = 1.5A

Technical Document Image Preview

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 RTQ6361GSP 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.

Technical Document Image Preview

Figure 1. Top View (1st layer)

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Figure 2. PCB Layout—Inner Side (2nd Layer)

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Figure 3. PCB Layout—Inner Side (3rd Layer)

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Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2021/03/12
Bill of Materials 2021/03/12
Schematic 2021/03/12
Gerber File 2021/03/12
RTQ6361

60VIN, 1.5A, Asynchronous Step-Down Converter with Low Quiescent Current

RTQ6361

The RTQ6361 is a 1.5A, high-efficiency, peak current mode control asynchronous step-down converter. The device operates with input voltages from 4V to 60V. The device can program the output voltage between 0.8V to VIN. The low quiescent current design with the integrated low RDS(ON) of high-side MOSFET achieves high efficiency over the wide load range. The peak current mode control with simple external compensation allows the use of small inductors and results in fast transient response and good loop stability.

The wide switching frequency of 100kHz to 2500kHz allows for efficiency and size optimization when selecting the output filter components. The ultra-low minimum on-time enables constant-frequency operation even at very high step-down ratios. For switching noise sensitive applications, it can be externally synchronized from 300kHz to 2200kHz.

The RTQ6361 provides complete protection functions such as input under-voltage lockout, output under-voltage protection, output over-voltage protection, over-current protection, and thermal shutdown. Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start-up. The RTQ6361 is available in WDFN-10SL 3x3 and SOP-8 (Exposed pad) packages.

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