Abstract: An integrated circuit for a switching power supply is provided. The integrated circuit has a first pin coupled to one end of an inductor, a second pin coupled to the other end of the inductor and one end of a first capacitor, a third pin coupled to the other end of the first capacitor, a fourth pin coupled to a second capacitor, a fifth pin coupled to a third capacitor, a sixth pin coupled to a reference ground, a first transistor coupled between the second pin and the sixth pin, a mode determination circuit for providing a mode signal to determine a drive voltage, and a gate driver for providing the determined drive voltage to a control terminal of the first transistor based on the mode signal.

Abstract: A LED matrix driving system has a micro controller with a first digital interface for providing a data write transaction pack and a monolithic integrated circuit switch device including a first terminal for receiving a power supply voltage, M scan terminals, a second digital interface and M power switches. The M scan terminals are respectively coupled to M scan lines of the LED matrix. The second digital interface is connected the first digital interface to receive the date write transaction pack. The date write transaction pack has M switch control codes for determining M switch control signals. The M power switches are connected to the M scan terminals respectively. In response to the M switch control signals, the M power switches are controlled to be turned on successively to control the LEDs of the M scan lines ON successively row by row.

Abstract: A dimming circuit for dimming a current flowing through a light emitting device, having: a multi-function pin, configured to receive a dimming signal; wherein when the dimming signal is an analog voltage signal, an amplitude of the current flowing through the light emitting device is regulated based on the dimming signal; when the dimming signal is a pulse signal and a frequency of the dimming signal is in a first frequency range, a duty cycle of the current flowing through the light emitting device is regulated based on the dimming signal; and when the dimming signal is the pulse signal and the frequency of the dimming signal is in a second frequency range, the amplitude of the current flowing through the light emitting device is regulated based on the dimming signal.

Abstract: A short to ground protecting circuit for an LED driver for providing a power supply voltage for N LED strings. The LED driver has an output terminal for providing a power supply voltage for the N LED strings and N feedback terminals having N detecting voltages respectively. For each i from 1 to N, the ith LED string is coupled between the output terminal and the ith feedback terminal, and the ith feedback terminal is configured to have the ith detecting voltage. The short to ground protecting circuit receives a short threshold voltage and N open fault signals, and generates N short indicating signals. And on the premise of the ith open fault signal is valid, and if the ith detecting voltage is less than the short threshold voltage for a preset time period, the ith short indicating signal is valid.

Abstract: A short to ground protecting circuit for an LED driver for providing a power supply voltage for N LED strings. The LED driver has an output terminal for providing a power supply voltage for the N LED strings and N feedback terminals having N detecting voltages respectively. For each i from 1 to N, the ith LED string is coupled between the output terminal and the ith feedback terminal, and the ith feedback terminal is configured to have the ith detecting voltage. The short to ground protecting circuit receives a short threshold voltage and N open fault signals, and generates N short indicating signals. And on the premise of the ith open fault signal is valid, and if the ith detecting voltage is less than the short threshold voltage for a preset time period, the ith short indicating signal is valid.

Abstract: A dimming circuit for dimming a current flowing through a light emitting device, having: a multi-function pin, configured to receive a dimming signal; wherein when the dimming signal is an analog voltage signal, an amplitude of the current flowing through the light emitting device is regulated based on the dimming signal; when the dimming signal is a pulse signal and a frequency of the dimming signal is in a first frequency range, a duty cycle of the current flowing through the light emitting device is regulated based on the dimming signal; and when the dimming signal is the pulse signal and the frequency of the dimming signal is in a second frequency range, the amplitude of the current flowing through the light emitting device is regulated based on the dimming signal.

Abstract: A short protecting circuit for a LED (Light-emitting Diode) driver for powering a plurality of LED strings, having: a short comparing circuit, configured to provide a plurality of short fault indicating signals; a first logic circuit, configured to provide a short fault signal based on the plurality of short fault indicating signals to indicate a short fault condition; a timing circuit, configured to provide a short protecting enable signal; and a second logic circuit, configured to provide a plurality of short isolating signals; wherein the short isolating signals are blocked when an open fault signal is valid.

Abstract: A short protecting circuit for a LED (Light-emitting Diode) driver for powering a plurality of LED strings, having: a short comparing circuit, configured to provide a plurality of short fault indicating signals; a first logic circuit, configured to provide a short fault signal based on the plurality of short fault indicating signals to indicate a short fault condition; a timing circuit, configured to provide a short protecting enable signal; and a second logic circuit, configured to provide a plurality of short isolating signals; wherein the short isolating signals are blocked when an open fault signal is valid.