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RT5047GSP Single Output LNB Supply and Control Voltage Regulator

EVB_RT5047GSP

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The device is consists of the independent current-mode boost controller and low dropout linear regulator along with the circuitry required for 22kHz tone shaping to support DiSEqC™ 1.x communications. The RT5047 provides fault protections including over-current, over-temperature and under-voltage lockout.
The RT5047 is available in a SOP-8 (Exposed Pad) package to achieve optimized solution for thermal dissipation.

Purpose

The RT5047 is a highly integrated voltage regulator and interface IC, specifically design for supplying power and control signals from advanced satellite set-top box (STB) modules to the LNB down-converter in the antenna dish or to the multi-switch box. This document explains the function and use of the RT5047 evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements.


Introduction

General Product Information

The device is consists of the independent current-mode boost controller and low dropout linear regulator along with the circuitry required for 22kHz tone shaping to support DiSEqC™ 1.x communications. The RT5047 provides fault protections including over-current, over-temperature and under-voltage lockout.

The RT5047 is available in a SOP-8 (Exposed Pad) package to achieve optimized solution for thermal dissipation.


Product Feature

  • Wide Input Supply Voltage Range : 8V to 16V
  • Output Current Limit of 550mA with 45ms timer
  • Low Noise LNB Output Voltage (13.3V and 18.3V by SEL Pin)
  • ±3% High Accuracy for 0mA to 500mA Current Output
  • Push-Pull Output Stage minimizes 13.3V to 18.3V and 18.3V to 13.3V Output Transition Time
  • External 22kHz Tone Input
  • Meet DiSEqC™ 1.x Protocol
  • Output Short Circuit Protection
  • Over-temperature Protection

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB014_V1

Default Input Voltage

12V

Max Output Current

500mA

Default Output Voltage

Low is for 13.3V, high is for 18.3V

Default Marking & Package Type

RT5047GSP, SOP-8 (Exposed Pad)

Operation Frequency

700kHz (Typ.)



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

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)

LNB

LNB output pin

Output Voltage for LNB.

BOOST

Boost feedback point

Boost Output and Tracking Supply Voltage to LNB.

LX

Switch node

Switching Node of DC/DC Boost Converter.

VIN

Input voltage

Power Supply Input.

EN

Enable point

High to enable the LNB and low to disable the LNB.

SEL

Output level select point

Low for VLNB is 13.3V and high for VLNB is 18.3V.

NC

No connection pin

Pull to 3.3V by 4.7kΩ resistor.

TONE

TONE input signal

Supply a 22kHz signal at this pin to control the output tone signal.

GND

Ground

The Exposed Pad must be soldered to a large PCB and connected to GND for maximum power dissipation.



Power-up & Measurement Procedure

1. Connect input power (8V < VIN < 16V) and input ground to VIN and GND test pins respectively.

2. To use a jumper at “H” option to tie EN test pin for enabling the device. Inversely, to use a jumper at “L” option to tie EN test pin and ground GND for disabling the device.

3. Supply a 22kHz signal of the “TONE” pin to adjust the output tone signal.

4. Verify the output voltage between LNB and GND.

5. Connect an external load up to 0.45A to the VOUT and GND terminals and verify the output voltage and current.



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT5047GSP

Voltage Regulator

SOP-8

(Exposed Pad)

RICHTEK

C1, C2, C3, C4, C5, C6

6

10µF/50V

C-0805

C8

1

100nF/25V

C-0603

C9

1

0.1µF/50V

C-0805

C10

1

NC

R1, C7

2

NC

R2

1

NC

R3, R4, R6, R7

4

4.7k

R-0603

R5

1

12k

R-0603

R8

1

4k

R-0603

L1

1

10µH

L-NR8040_2

GP1, GP2, GP3

3

GND

SIP-1P-GP

GP4

1

VIN

SIP-1P-GP

GP5

1

LNB

SIP-1P-GP

D1, D2, D3

3

SS14

SS14

D4

1

SMDJ20A

D-SMC_DO-214_1

J1

1

TONE

SIP-3P

J2

1

NC

SIP-3P

J3

1

SEL

SIP-3P

J4

1

EN

SIP-3P

Z1, Z2

2

FK_1

FK_1

Z3, Z4, Z5, Z6

4

SIP-1P-M

SIP-1P-M



PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2015/12/16
Bill of Materials 2015/12/16
Gerber File 2015/12/16
Schematic 2015/12/16
RT5047

单输出 LNB 供应和控制电压调节器

RT5047

RT5047是一高度整合电压调节器与IC接口,专门设计从先进的卫星机顶盒(STB)组件供应电源及控制信号到LNB降控制器的天线或多开关盒。
此设置随着22kHz信号支持DiSEqCTM1.x通讯所需的电路,包含独立电流模式升压模式控制器和低电压差线性调节器。
RT5047有错误侦测保护(过流保护、过温保护及欠压锁定)。
其支持SOP-8(裸露焊盘)封装以达到优化过温散热的解决方案。

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