Demand for video surveillance security monitoring is booming, and the technology is becoming more economical for personal and business applications. Driven by higher standards of security requirements, millions of surveillance cameras have been installed around the world.
Because many surveillance cameras are always on, surveillance camera manufacturers have turned to energy-efficient light-emitting diode (LED) lighting. Compared to previously used incandescent/fluorescent lamps, LEDs are 80-90% more efficient and have lower heat dissipation. At the same time, LEDs have a longer lifetime and take up less space in video surveillance camera applications.
As production volumes increase, camera manufacturers demand that LED driver boards be designed to be simpler, more compact, and less costly. But at the same time, they need LED drivers that meet higher efficiency, lower power consumption, higher accuracy, and better image resolution. Faced with these challenges, hardware engineers need an LED driver solution that meets all of these requirements.
TI's TPS54200 is a new DC/DC synchronous buck LED driver that helps support video surveillance and other end devices. The device offers an efficient, cost-effective solution with high analog dimming accuracy. The TPS54200 is packaged in a simple small outline transistor (SOT) 23-6 package that allows users to easily design LED driver boards.
Figure 1 shows a simplified circuit schematic of the TPS54200, driving a series of white LEDs with an absolute minimum number of external components. This would be a good solution for commercial/industrial video surveillance cameras or other general purpose LED lighting.
Figure 1: Simplified schematic of the TPS54200
When driving LED strings, the TPS54200 has a lower RDS(on) value, providing high efficiency. Flip-chip on-lead (FCOL) technology minimizes inductance and resistance between the mold and package leads. With its low on-resistance, the device operates efficiently (97% peak efficiency) while keeping the power of the surveillance camera as low as possible. See Figure 2.
Figure 2: TPS54200 efficiency under 1A load
TI designed the analog dimming function of the TPS54200 with excellent accuracy, which makes the current through the LED proportional to the pulse width modulation (PWM) duty cycle with good linearity and good linearity. See Figure 3. Therefore, you can make the microcontroller unit (MCU) generate PWM pulses with higher precision than typical dimming with DC voltage.
Figure 3: 100% linearity of LED current and PWM duty cycle
With the TPS54200, a series of LEDs can be driven with very high brightness accuracy through the PWM input, even with a 5% PWM duty cycle. This is a huge benefit for end-equipment designers who want to ensure accurate brightness control, even when using unadjusted LEDs for low cost. See Figure 4.
Figure 4: Current Accuracy Test of TPS54200 LEDs with Uncalibrated White LEDs
Following the global trend of low-power LED lighting, the TPS54200 drives a range of white LEDs with high brightness control in a simple, easy-to-use, and cost-effective design. For video surveillance camera manufacturers and other end device manufacturers who need to use a simple LED driver for tandem LED lighting, they will find the value of such a solution. Get more information on designing a video surveillance camera.
About this item
- 9V Switching wall charger
- 110V input voltage / 9VDC 1A/2A/3A... output voltage
- For use with Arduino Uno, Mega and MB102 Power supply boards
- Connector size: 5.5 x 2.1mm/5.5*2.5mm...
- Center or Tip is positive, sleeve is negative
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