“Barcode scanners are also known as barcode readers, barcode scanners, etc. Barcode scanners use the principle of photoelectricity to convert barcode information into input devices that can be accepted by computers. They are often used in libraries, hospitals, bookstores, supermarkets, logistics and other industries.
“
Author: Eileen Zhang
Barcode scanners are also known as barcode readers, barcode scanners, etc. Barcode scanners use the principle of photoelectricity to convert barcode information into input devices that can be accepted by computers. They are often used in libraries, hospitals, bookstores, supermarkets, logistics and other industries.
Figure 1. Barcode Scanner
So, how does the boost converter TPS61376 help in a more integrated barcode scanner solution? Barcode scanners usually have high-power Flash LEDs for light emission, and their instantaneous current is relatively large, generally 2 to 3A or even larger depending on the number of LEDs used. The power supply of the barcode scanner is USB or battery, especially the USB interface cannot withstand such an instantaneous high current, so a buffer capacitor is usually added to the system to provide instantaneous energy by this buffer capacitor. The USB power supply test adds current limiting protection to prevent the USB power supply from being pulled to death by instantaneous high current. At the same time, a boost circuit is required in the circuit to boost the input of the barcode scanner to supply power to the Flash LED. The following figure is a block diagram of the barcode scanner system.
Figure 2. Barcode Scanner System Block Diagram
In addition to the boost function, the biggest highlight of the TPS61376 is the input average current limit function. This function is the input current limit protection required by the system mentioned above. Before the TPS61376 solution appeared, customers usually needed to add an additional efuse or switch to achieve input current limiting. The TPS61376 directly comes with a 2.5% accuracy input average current limiting function to help implement a more integrated barcode scanner solution. The waveform below shows the input average current limit function of the TPS61376.
Figure 3. Input Average Current Limit Function (Test Condition: Vin=5V; Vout=12V; Ilimit=0.5A)
Other parameters of the fully integrated Boost Converter TPS61376
• Supports wide-range input from 9V to 23V and wide-range output up to 25V;
• 5A switching current, which can well meet the current requirements of Flash LED in barcode scanners;
• The overall solution is small in size, simple in design, and low in BOM cost:
• The chip adopts a small size VQFN package, only 5mm×2mm;
• Support 2MHz switching frequency to optimize the volume of peripheral devices.
The following figure shows the circuit block diagram of TPS61376.
Figure 4. TPS61376 circuit block diagram
In addition to the need for boosting, there are also some requirements for boosting and boosting in barcode scanners. TI’s latest TPS631000 is a 5V/3A, 8uA buck-boost product with static power consumption.
For more information on TPS61376 and TPS631000, you can download the user manual from TI’s official website. For any support, contact Eileen Zhang, TI Product Line Marketing Engineer.
“Barcode scanners are also known as barcode readers, barcode scanners, etc. Barcode scanners use the principle of photoelectricity to convert barcode information into input devices that can be accepted by computers. They are often used in libraries, hospitals, bookstores, supermarkets, logistics and other industries.
“
Author: Eileen Zhang
Barcode scanners are also known as barcode readers, barcode scanners, etc. Barcode scanners use the principle of photoelectricity to convert barcode information into input devices that can be accepted by computers. They are often used in libraries, hospitals, bookstores, supermarkets, logistics and other industries.
Figure 1. Barcode Scanner
So, how does the boost converter TPS61376 help in a more integrated barcode scanner solution? Barcode scanners usually have high-power Flash LEDs for light emission, and their instantaneous current is relatively large, generally 2 to 3A or even larger depending on the number of LEDs used. The power supply of the barcode scanner is USB or battery, especially the USB interface cannot withstand such an instantaneous high current, so a buffer capacitor is usually added to the system to provide instantaneous energy by this buffer capacitor. The USB power supply test adds current limiting protection to prevent the USB power supply from being pulled to death by instantaneous high current. At the same time, a boost circuit is required in the circuit to boost the input of the barcode scanner to supply power to the Flash LED. The following figure is a block diagram of the barcode scanner system.
Figure 2. Barcode Scanner System Block Diagram
In addition to the boost function, the biggest highlight of the TPS61376 is the input average current limit function. This function is the input current limit protection required by the system mentioned above. Before the TPS61376 solution appeared, customers usually needed to add an additional efuse or switch to achieve input current limiting. The TPS61376 directly comes with a 2.5% accuracy input average current limiting function to help implement a more integrated barcode scanner solution. The waveform below shows the input average current limit function of the TPS61376.
Figure 3. Input Average Current Limit Function (Test Condition: Vin=5V; Vout=12V; Ilimit=0.5A)
Other parameters of the fully integrated Boost Converter TPS61376
• Supports wide-range input from 9V to 23V and wide-range output up to 25V;
• 5A switching current, which can well meet the current requirements of Flash LED in barcode scanners;
• The overall solution is small in size, simple in design, and low in BOM cost:
• The chip adopts a small size VQFN package, only 5mm×2mm;
• Support 2MHz switching frequency to optimize the volume of peripheral devices.
The following figure shows the circuit block diagram of TPS61376.
Figure 4. TPS61376 circuit block diagram
In addition to the need for boosting, there are also some requirements for boosting and boosting in barcode scanners. TI’s latest TPS631000 is a 5V/3A, 8uA buck-boost product with static power consumption.
For more information on TPS61376 and TPS631000, you can download the user manual from TI’s official website. For any support, contact Eileen Zhang, TI Product Line Marketing Engineer.
The Links: G121SN01 V1 SKD145/16
