Non-isolation ICs have always played an important role in LED lighting applications. These products are structurally more efficient than isolated ones, have smaller spaces and plates, and have more Low system cost, and therefore, has gradually become a mainstream solution in many application directions and fields.
The SQ9910 continues the industry's similar product specifications, including a wide range of input voltages (85-265VAC), simple constant current design and other basic features, plus over temperature protection (Over Temperature Protection), surge current suppression, More stable constant current output than other brands, MOSFET dual drive voltage selection (7.5V/10V), output stage compensation and other functions, integrated in a chip, is the most complete solution in the same level of chip.
The SQ9910 can operate at frequencies up to 300kHz in fixed frequency mode or in constant OFF-time mode to effectively reduce EMI noise. The SQ9910 uses a unique high voltage. The process design, combined with a unique built-in soft-start function, can withstand surges of up to 500V. This feature can avoid damage to the MOSFET and system due to the different three-phase electrical surge voltages in different countries of the world.
In terms of reducing switching losses, the SQ9910 also provides an improvement over previous non-isolated solutions such as the HV9910. For example, the MOSFET driving voltage of this type of IC is only 7.5V. Generally speaking, the domestic high-voltage MOSFET can not fully turn on the MOSFET under the gate voltage VGS of 7.5V. For this reason, based on the same architecture of SQ9910, Changæ—¸ Technology introduced the A version (SQ9910A) with a drive voltage of 10-12V. By changing the original PCB design, the MOSFET can be further turned on by increasing the driving voltage to increase the conversion efficiency of the system, thereby reducing the temperature of the MOSFET. In addition, the dimming aspect of the SQ9910 is the same as that offered by the same class in the industry. It has linear dimming and pulse modulation (PWM), which can be adjusted to 0-100% by adjusting the duty cycle. Dimming effect.
Recently, advanced countries have become more and more demanding on power factors in energy-saving specifications for LED lighting applications. In the non-isolated scheme, due to the chip itself and system space constraints, the passive cost-filling (valley-fill) is generally used to improve the power factor (PFC). The main function of this circuit is to improve the power factor by improving the harmonic distortion in the power factor by using a high-voltage electrolytic capacitor at the input to increase the conduction angle. However, since the capacitor is connected in series in the circuit, the rectified input DC voltage will drop to half of the input terminal after passing through the valley filling circuit, resulting in current mode buck conversion during system design. Current mode buck converter When the duty ratio exceeds 50%, that is, when the output voltage drop is more than half of the input voltage, the noise of the magnetic component is caused by the sub-harmonics oscillation. The SQ9910 eliminates this type of noise by using automatic frequency division.
The SQ9910 continues the industry's similar product specifications, including a wide range of input voltages (85-265VAC), simple constant current design and other basic features, plus over temperature protection (Over Temperature Protection), surge current suppression, More stable constant current output than other brands, MOSFET dual drive voltage selection (7.5V/10V), output stage compensation and other functions, integrated in a chip, is the most complete solution in the same level of chip.
The SQ9910 can operate at frequencies up to 300kHz in fixed frequency mode or in constant OFF-time mode to effectively reduce EMI noise. The SQ9910 uses a unique high voltage. The process design, combined with a unique built-in soft-start function, can withstand surges of up to 500V. This feature can avoid damage to the MOSFET and system due to the different three-phase electrical surge voltages in different countries of the world.
In terms of reducing switching losses, the SQ9910 also provides an improvement over previous non-isolated solutions such as the HV9910. For example, the MOSFET driving voltage of this type of IC is only 7.5V. Generally speaking, the domestic high-voltage MOSFET can not fully turn on the MOSFET under the gate voltage VGS of 7.5V. For this reason, based on the same architecture of SQ9910, Changæ—¸ Technology introduced the A version (SQ9910A) with a drive voltage of 10-12V. By changing the original PCB design, the MOSFET can be further turned on by increasing the driving voltage to increase the conversion efficiency of the system, thereby reducing the temperature of the MOSFET. In addition, the dimming aspect of the SQ9910 is the same as that offered by the same class in the industry. It has linear dimming and pulse modulation (PWM), which can be adjusted to 0-100% by adjusting the duty cycle. Dimming effect.
Recently, advanced countries have become more and more demanding on power factors in energy-saving specifications for LED lighting applications. In the non-isolated scheme, due to the chip itself and system space constraints, the passive cost-filling (valley-fill) is generally used to improve the power factor (PFC). The main function of this circuit is to improve the power factor by improving the harmonic distortion in the power factor by using a high-voltage electrolytic capacitor at the input to increase the conduction angle. However, since the capacitor is connected in series in the circuit, the rectified input DC voltage will drop to half of the input terminal after passing through the valley filling circuit, resulting in current mode buck conversion during system design. Current mode buck converter When the duty ratio exceeds 50%, that is, when the output voltage drop is more than half of the input voltage, the noise of the magnetic component is caused by the sub-harmonics oscillation. The SQ9910 eliminates this type of noise by using automatic frequency division.
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