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RT6200GE Evaluation Board

EVB_RT6200GE

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The RT6200 is a high voltage Buck converter that can support the input voltage range from 4.5V to 36V and the output current can be up to 0.6A. Current mode operation provides fast transient response and eases loop stabilization. The chip also provides protection functions such as cycle-by-cycle current limit and thermal shutdown protection. The RT6200 is available in the SOT-23-6 package.

Purpose

The RT6200 is a high voltage Buck converter that can deliver up to 0.6A output current from a wide input voltage range of 4.5V to 36V. This document explains the function and use of the RT6200 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements.

Introduction

General Product Information

The RT6200 is a high voltage Buck converter that can support the input voltage range from 4.5V to 36V and the output current can be up to 0.6A. Current mode operation provides fast transient response and eases loop stabilization. The chip also provides protection functions such as cycle-by-cycle current limit and thermal shutdown protection. The RT6200 is available in the SOT-23-6 package.

Product Feature

  • Wide Operating Input Voltage Range : 4.5V to 36V
  • Adjustable Output Voltage Range : 0.8V to 15V
  • 0.6A Output Current
  • 0.35Ω Internal Power MOSFET Switch
  • High Efficiency up to 95%
  • 1.2MHz Fixed Switching Frequency (Duty <90%)
  • Support duty up to 95%
  • Stable with Low ESR Output Ceramic Capacitors
  • Thermal Shutdown
  • Cycle-By-Cycle Over-Current Protection

Key Performance Summary Table

Key Features

Evaluation Board Number: PCB008_V1

Default Input Voltage

12V

Max Output Current

0.6A

Default Output Voltage

5V

Default Marking & Package Type

RT6200GE

Operation Frequency

Steady 1.2MHz at all loads

Other Key Features

4.5V to 36V Input Voltage Range

Support duty up to 95%

Protection

Cycle-By-Cycle Over Current Protection

Thermal Shutdown

 

Bench Test Setup Conditions

Headers Description and Placement

IMG_0276

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to 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

Signal

Comment (expected waveforms or voltage levels on test points)

VIN

Input voltage

Input voltage range= 4.5V to 36V

VOUT

Output voltage

Default output voltage = 5.0V

Output voltage range= 0.8V to 15V

(see ‘’Output Voltage Setting’’ section for changing output voltage level)

SW

Switching node test point

SW waveform

EN

Enable test point

Enable signal. EN is automatically pulled high by internal circuit to enable operation. Connect EN low (or by R4 pull low resistor) to disable operation.

BST

Boot strap supply test point

Floating supply voltage for the high-side N-MOSFET switch

GND

Ground

Ground

 

Power-up & Measurement Procedure

1.Apply a 12V nominal input power supply (4.5V < VIN < 36V) to the VIN and GND terminals.

2.The EN voltage is pulled to logic high by internal circuit to enable operation. Drive EN high (>2.5V) to enable operation or low (<0.4V) to disable operation.

3.There is a 3-pin header JP2 “EN” for enable control. To use a jumper at “H” option to tie EN test pin to input power VIN for enabling the device. Inversely, to use a jumper at “L” option to tie EN test pin and ground GND for disabling the device.

4.Verify the output voltage (approximately 5.0V) between VOUT and GND.

5.Connect an external load up to 0.6A to the VOUT and GND terminals and verify the output voltage and current.

Output Voltage Setting

Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula:

Technical Document Image Preview

The installed VOUT capacitor (C4) is 22μF, 16V X5R ceramic types. Do not exceed their operating voltage range and consider their voltage coefficient (capacitance vs. bias voltage) and ensure that the capacitance is sufficient to maintain stability and provide sufficient transient response for your application. This can be verified by checking the output transient response as described in the RT6200 IC datasheet.

Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview

C2: 10μF/50V/X5R, 1206, TDK C3216X5R1H106K

C4: 22μF/16V/X5R, 1210, Murata GRM32ER61C226K

L1: 15μH TAIYO YUDEN NR8040T150M, DCR=50mΩ

Bill of Materials

Reference

Qty

Part number

Description

Package

Manufacture

U1

1

RT6200GE

DC-DC Converter

SOT-23-6

RICHTEK

C2

1

C3216X5R1H106K160AB

10μF/±10%/50V/X5R

Ceramic Capacitor

1206

TDK

C4

1

GRM32ER61C226KE20#

22μF/±10%/16V/X5R

Ceramic Capacitor

1210

Murata

C8

1

GRM32MR71H103KA01#

10nF/±10%/50V/X7R

Ceramic Capacitor

0603

Murata

L1

1

NR8040T150M

15μH/2.7A/±20%, DCR=50mΩ, Inductor

8mmx8mmx4mm

TAIYO YUDEN

R1

1

91kΩ/±1%, Resistor

0603

R2

1

17.4kΩ/±1%, Resistor

0603

CP1

1

Short

D1

1

B340A

40V/3A Schottky Diode

Diodes

JP2

1

3-Pin Header

C1, C3, C5, C6, C7, C9, C10, R4, R5, D2

0

Not Installed

0603

TP

3

BST, SW, EN

Test Pin

GP

6

VIN, GND, VOUT, GND, GND, GND

Golden Pin

 

EVB Layout

Technical Document Image Preview

Top View (1stlayer)

Technical Document Image Preview

Bottom View (4th Layer)

Technical Document Image Preview

Component Placement Guide—Component Side (1stlayer)

Technical Document Image Preview

PCB Layout—Component Side (1stLayer)

Technical Document Image Preview

PCB Layout—Bottom Side (4th layer)

Title Last Update Share Download
Evaluation Board User Guide 2015/06/29
Bill of Materials 2015/06/29
RT6200

0.6A, 36V, 1.2MHz降压型转换器

RT6200

RT6200为高压输入的降压转换器,可支持输入电压范围从4.5V至36V,最大输出电流至0.6A。电流模式操作提供快速的瞬时响应与简易的回路稳定架构,此外并提供了逐周期形式的限流机制与热关断保护功能。RT6200采用SOT-23-6的封装规格。

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