Sq9910 is an efficient pulse dimming LED driver control IC Its input voltage from 85vac to 265vac can effectively drive high brightness LED. The chip can drive external MOSFET at a fixed frequency of up to 300kHz by setting a peripheral resistance In order to ensure constant brightness and enhance led reliability, the external bright LED string is controlled by constant current rather than constant voltage. Its constant current value is determined by the external sampling resistance value, and the variation range can be from a few milliamps to an ampere. Sq9910 uses a high-voltage isolation connection process design, which can withstand the impact of surge input voltage up to 500V. The output current of an LED string can be programmed to any value between zero and its maximum value, which is controlled by the external control voltage input to the linear dimmer of sq9910 In addition, sq9910 also provides a low-frequency PWM dimming function, which can accept an external control signal up to several kHz for dimming at 0-100% duty cycle

Compared with Supertex HV9910 pin to pin comparable, this product has the following advantages:

1.) in terms of features, the input voltage surge rates of sq9910 are higher than those of HV9910, which is stronger for IC

2.) in terms of features, sq9910 has an internal thermal protection that HV9910 lacks, which adds a layer of protection to the system

3.) compared with the above waveforms, the gate waveform of sq9910 is better than that of HV9910, and the temperature stability accuracy of the system is higher than that of hv9910