RT5047AGSP
Evaluation Board
your power partner.
RT5047AGSP Single Output LNB Supply and Control Voltage
Regulator
Purpose
The RT5047A 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 RT5047A evaluation board (EVB), and
provides information to enable operation, modification of the evaluation board and circuit to suit individual
requirements.
Table of Contents
Purpose ................................................................................................................................................................. 1
Introduction............................................................................................................................................................ 2
Key Performance Summary Table .......................................................................................................................... 2
Bench Test Setup Conditions ................................................................................................................................. 3
Schematic, Bill of Materials & Board Layout ........................................................................................................... 4
More Information.................................................................................................................................................... 7
Important Notice for Richtek Evaluation Board ....................................................................................................... 7
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RT5047AGSP
Evaluation Board
your power partner.
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 RT5047A provides fault
protections including over-current, over-temperature and under-voltage lockout.
The RT5047A 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
RT5047AGSP, SOP-8 (Exposed Pad)
Operation Frequency
700kHz (Typ.)
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RT5047AGSP
Evaluation Board
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Bench Test Setup Conditions
Headers Description and Placement
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. Output capacitor should not higher than 4.7µF.
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.
FAULT
Fault detect point
Open drain. Pull to 3.3V by 4.7kΩ resistor. This pin will pull to low when
OCP trigger.
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.
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RT5047AGSP
Evaluation Board
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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
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RT5047AGSP
Evaluation Board
your power partner.
Bill of Materials
Reference
Qty
Part Number
Description
Package
Manufacture
U1
1
RT5047AGSP
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
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RT5047AGSP
Evaluation Board
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PCB Layout
Top View
Bottom View
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RT5047AGSP
Evaluation Board
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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.
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