In the smooth current mode, the LED display manufacturer's drive components must be supplied with overpressure protection. The LED will be disconnected from the power supply so that no leakage current will occur when the power supply is lost, and the output capacitors will be full between the turns of the PWM brightness adjustment. Smooth current can occur regardless of the load being a lot. However, if the load resistance increases, the output voltage of the opposite power supply must also increase. When the load resistance detected by the power supply, or the load is disconnected, then the output voltage will roughly override the operating voltage scale of the IC, or other components.
It is necessary to supply overpressure protection in the drive. Load disconnection is a trivial effect of the LED driver power supply , because when the power supply is missing, the load can be disconnected to disconnect the LED from the power supply. This kind of power is not equal to the two cases, that is, power off and PWM dimming. For example, in the era of boost converter power-down, the load simulation is still connected to the input voltage through the inductor and diode. For example, the Zener diode can be manipulated in parallel with the LED, because in the era when the PWM is not operating, the power supply is in the event of a missing effect, but the output capacitance simulation is still connected to the LED. If no load is disconnected, the output capacitor simulation will still supply the LED power until the PWM is turned back on. Since the capacitor is discharged at the beginning of each PWM cycle, the power supply must charge the output capacitor every time the PWM cycle starts, so a surge pulse occurs when each PWM cycle occurs. The inrush current causes a reduction in system compliance and an instantaneous voltage on the input bus. Such a system can limit the output voltage to the Zener diode breakdown voltage and power supply if it has a load disconnecting effect. When an overvoltage occurs, the output voltage will advance to the Zener diode breakdown point and pass through the Zener diode and then to the grounded current sense resistor, so that the Zener diode and the LED can be connected in parallel to supply the output current.
It is also possible to manipulate the monitored output voltage to block the power supply before reaching an overvoltage. When overvoltage conditions occur, LED drivers can reduce power consumption and extend battery life. Portable LCD backlight applications require a limited amount of brightness. In this part, two kinds of dimming systems can be accepted, that is, analog or PWM. Accepting analog dimming, like the master's familiarity, adds 50% of the current to the LED so that 50% of the brightness can be advanced. However, this kind of system is a shortcoming, that is, there will be LED color shift, and it needs to accept the analog control signal. This mode is usually not much.
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