For the era of energy saving and carbon reduction, Light-Emitting Diode (LED) has been widely used as a light source because of its excellent luminous efficiency and compact component volume, and the electro-optical conversion of LEDs. The efficiency is quite good, higher than fluorescent lamps, cold cathode tubes (CCFLs) or light bulbs, so the current trend is to replace these sources with LEDs. For example, modern LCD panels mostly replace LEDs with LEDs as backlights. LEDs have almost replaced CCFLs as backlights for LCD panels.
Tongjia introduces backlight driver IC - LD7890 is mainly boost topology, which can drive 4 Channel LED light bar, 10V MOSFETDRV output voltage, high conversion efficiency, external 4 Channel current balance drive, constant current LED. Wide input voltage range of 9V ~ 28V, can cooperate with various power sources to drive LED to produce uniform brightness, external 4 Channel current balance drive, application is not limited to LED light bar drive current or voltage, only need to select the corresponding External components are all right.
The LD7890 has built-in innovative patented technology to meet the specifications of the following system vendors.
(1) For the IC Thermal problem required by the system, the IC Package temperature can be lower than the customer's specifications.
(2) Flexible for 4 Channel LED light bar with the following drivers, parallel function for applications above 4 Channel LED light bar.
(3) LED Short Protection Threshold is adjustable, flexible, only need to use the resistor is not limited by the controller process.
(4) Single CH Fault detection, which can be used as single CH LED Open/Short protection. Other CHs maintain motion and use elasticity.
LD7890 backlight protection mechanism
Focusing on a larger LED TV, the LD7890 provides LED short-circuit and open-circuit protection, as well as an output protection signal for LED malfunction detection, allowing the system to determine the LED light bar usage.
APM SP300VAC3000W is an economically programmable DC and AC output power supply to provide reliable voltage and simulation for general applications such as testing for commercial, power electronics, avionics, military and IEC regulation test applications. The AC power source has various communication interface and can be remote controlled by computer.
The AC source is capable of delivering up to 6 times of peak current compared to its maximum rated current that makes it ideal for inrush current test.
Some features as below:
- 5.6"large touch color screen
- AC+DC mixed or independent output mode
- Capable of setting output slope/phase angle
- Built-in IEC standard test function
- Built-in multiple protections
- Built-in power meter
- Support impedance function
- Support for LIST/PULSE/STEP mode & Transient mode
- Standard RS232/RS485/USB/LAN, Optional GPIB/multiphase card.
- Support master and slave parallel mode to realize power extension
- Support harmonics/inter-harmonics simulation and measuring function
- Support for USB data import/export and scree nap from front panel
- PWM technologies, with up to 86% efficiency
- CE, CSA, UL, ROHS Certified
3000W AC Power Supply,Programmable AC Power Supply,Adjustable Ac Dc Power Supply,3000W Switching Power Supply
APM Technologies Ltd , https://www.apmpowersupply.com