Sure Electronics TL494 User manual

©2004-2013 Sure Electronics Inc. PS-SP12151_Ver1.0
300W Boost Converter for CAR Audio
– TL494
User’s Guide

300W Boost Converter for CAR Audio - TL494
©2004-2013 Sure Electronics Inc. PS-SP12151_Ver1.0
To keep the product in a best working condition and having a long service time, please operate it according to
the relevant steps. The warranty lapses if the product is damaged because of incorrect use and your
negligence.
Please read this manual carefully before you use the product and check if the product is a good one. DC12V
is recommended to be used to power the product for one hour. Never use this product in an extreme
condition.
Warning: Never immerse the product in the rain or any other humid environment to prevent the fire or
electric shock.
Safety Precautions:
1. This product is designed for Car audio amplifier. Please fix it well.
2. Protect this product well and move away metal objects from this product.

300W BOOST CONVERTER FOR CAR AUDIO
- TL494
USER’S GUIDE
©2004-2013 Sure Electronics Inc. PS-SP12151_Ver1.0_Page i
Table of Contents
Chapter 1. Overview ..........................................................................................................1
1.1 Overview.............................................................................................................. 1
1.2 Features............................................................................................................... 2
1.3 Applications......................................................................................................... 2
1.4 Benefits................................................................................................................ 2
1.5 Quick Start ........................................................................................................... 3
Chapter 2. Hardware Detail ...............................................................................................4
2.1 Input Connection................................................................................................. 4
2.2 Output Connection.............................................................................................. 4
2.3 Enable Pin Connection....................................................................................... 4
2.4 LED Indicator....................................................................................................... 4
Chapter 3. Electrical Characteristics ...............................................................................5
Chapter 4. Mechanical Drawing........................................................................................6
Chapter 5. Contact Us .......................................................................................................7

300W BOOST CONVERTER FOR CAR AUDIO - TL494
©2004-2013 Sure Electronics Inc PS-SP12151_Ver1.0_Page ii
NOTES:
Product Version ：Ver 1.0
Document Version ：Ver 1.0

300W BOOST CONVERTER FOR CAR AUDIO
- TL494
USER’S GUIDE
©2004-2013 Sure Electronics Inc.
PS-SP12151_Ver1.0_Page 1
1.1 Overview Welcome to use this self-made 300W Boost Converter for CARAudio - TL494. This item
is especially designed for CAR audio. It can be used with amplifiers from Sure
Electronics. With DC12V input, it can output voltage of DC18V, DC24V, DC30V, DC36V,
DC48 and power of up to 300W. You can set DIP switches to get the voltage required in
your applications. Do turn off the power before adjust the voltage.
DIP Switch Settings and Voltage
VOUT K1 K2 K3 K4
24V ON OFF OFF OFF
30V OFF ON OFF OFF
36V OFF OFF ON OFF
40V OFF OFF OFF ON
48V OFF OFF OFF OFF
Please adjust the adjustable resistance-R27 if you want to get more precise voltage.
FIGURE 1-1 OVERVIEW
Chapter 1. Overview

Overview
©2004-2013 Sure Electronics Inc
PS-SP12151_Ver1.0_Page 2
1.2 Features
yA mature DC/DC Boost Converter
yLED status indicator
yVoltage adjustable via DIP switch
yA smart cooling fan
yInput lines with fuses protection
1.3 Applications
yCar audio power conversion
1.4 Benefits
yExcellent heat dissipation eliminates the requirement of an extra heat sink.
yRigorous component selection, layout and test to ensure performance stability
yKinds of output voltage selectable
yEN pin for external connection
yWide input voltage range
yWide output voltage range
yOutput voltage can be fine-tuned by rotating the adjustable resistance
yLow-voltage protection (10V)
yOver-voltage protection (28V)
yFan starts to work when the output current is greater than 3A

300W Boost Converter for CAR Audio - TL494
©2004-2013 Sure Electronics Inc. PS-SP12151_Ver1.0_Page 3
1.5 Quick Start
Suggested connection is shown in figure 1-2.
FIGURE 1-2 CONNECTION SCHEMATIC
Note: Please observe the following steps to complete verification so as to ensure the
products are intact during transit.
1. Open the product package and make sure the product is intact (No missing or
damaged components and no deformation.)
2. Please observe the connection schematics when connecting the 300W Boost
Converter for CAR Audio - TL494. Use nearby DC12Vand a multimeter to have a
trial. This 300W Boost Converter for CAR Audio - TL494 can be deemed as
qualified if the indicator keeps on and output voltage is the same or similar
with the value marked.

300W BOOST CONVERTER FOR CAR AUDIO
- TL494
USER’S GUIDE
©2004-2013 Sure Electronics Inc.
PS-SP12151_Ver1.0_Page 4
2.1 Input Connection
A high-performance power supply is important for a 300W Boost Converter for CAR
Audio - TL494 to output voltage and work stably. Pay attention to the polarity when
connecting power supply.
2.2 Output Connection
Before power the amplifier, please test if the voltage is what you want and pay attention
to the polarity.
2.3 Enable Pin Connection
When EN pin is suspended or grounded, boost converter works.
When EN pin connects to DC12V, boost converter won’t work.
2.4 LED Indicator
This 300W Boost Converter for CAR Audio - TL494 has one LED indicator which shows
the current operation status. The indicator will be constantly illuminated in green when
the converter works normally.
FIGURE 1-2 LED INDICATOR
Chapter 2. Hardware Detail

300W BOOST CONVERTER FOR CAR AUDIO
- TL494
USER’S GUIDE
©2004-2013 Sure Electronics Inc.
PS-SP12151_Ver1.0_Page 5
Following table lists all typical data of the 300W Boost Converter for CAR Audio - TL494.
TABLE 3-1 BASIC PARAMETERS
Parameter Condition Min. Typ. Max.
Supply Voltage - 11V 12V 27V
EN enabled Voltage - 12V
Output Power - - 300W
Oscillation Frequency - - 55KHZ -
Quiescent Current VIN=12V - 20mA -
Operating Temperature - 0℃20℃80℃
Storage Temperature - -20℃20℃105℃
Thermal Shutdown - - 150℃-
Note:
Stresses beyond the listed maximum power supply voltage may cause the
permanent damage to components on board.
Chapter 3. Electrical Characteristics

300W BOOST CONVERTER FOR CAR AUDIO
- TL494
USER’S GUIDE
©2004-2013 Sure Electronics Inc.
PS-SP12151_Ver1.0_Page 6
FIGURE 4-1 MECHANICAL DRAWING
Chapter 4. Mechanical Drawing

300W BOOST CONVERTER FOR CAR AUDIO
- TL494
USER’S GUIDE
©2004-2013 Sure Electronics Inc.
PS-SP12151_Ver1.0_Page 7
Sure Electronics Co., Ltd.
East zone, 3F, Building 6
Jingang Technology Innovation Center
No.108 Ganjiabian Rd (ZIP: 210000)
Qixia District
Nanjing
P.R.China
Tel: [phone]
Fax: [phone]
Website: www.sure-electronics.com
Email: [e-mail]
Chapter 5. Contact Us