Switching control circuit and led driving circuit using the same
AssigneeMagnaChip Semiconductor, Ltd.
InventorsJang Hyuck LEE, Hyun Mo AHN, Byoung Kwon AN
Life of this patent
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Abstract
A switching control circuit configured to turn on a driving switching element by providing a gate signal to the driving switching element connected in series to an LED includes the switching control circuit configured to divide a PWM dimming signal into a normal PWM dimming section and a low PWM dimming section based on a timing selection signal, provide the gate signal of a first frequency to the driving switching element in the normal PWM dimming section, and provide the gate signal of a second frequency, greater than the first frequency, in the low PWM dimming section.
Claims24
A switching control circuit configured to turn on a driving switching element by providing a gate signal to the driving switching element connected in series to an LED, the switching control circuit comprising:
- the switching control circuit configured to divide a PWM dimming signal into a normal PWM dimming section and a low PWM dimming section based on a timing selection signal, provide the gate signal of a first frequency to the driving switching element in the normal PWM dimming section, and provide the gate signal of a second frequency, greater than the first frequency, in the low PWM dimming section.
An LED driving circuit, comprising:
- a buck converter configured to include a driving switching element connected in series to an LED module;
- and
- a switching control circuit configured to provide a gate signal to the driving switching element, divide a PWM dimming signal into a normal PWM dimming section and a low PWM dimming section based on a timing selection signal, provide the gate signal of a first frequency to the driving switching element in the normal PWM dimming section, and provide the gate signal of a second frequency greater than the first frequency in the low PWM dimming section.
A switching control circuit, comprising:
- an off-time controller configured to receive a timing selection signal, determine a length of a low PWM dimming section of a PWM dimming signal in accordance with a voltage level of the timing selection signal, select and output a control signal of a first frequency in a normal PWM dimming section of the PWM dimming signal, and select and output a control signal of a second frequency, greater than the first frequency, during the low PWM dimming section;
- and
- a switch driving unit configured to generate a gate signal from the selected result to a driving switching element connected in series to an LED.
Dependencies are inferred from the claim text.