H6842S
Description
The H684 2 is a lo w startup cu rrent, lo w co st, curre n. mode PWM co ntroller with Package Code: P Green-Power & burst- mode power-saving operation. The integrated functions such as the leading-edge blanking of the current sensing, internal slope pensation
- provide the users a high efficiency, low external ponent counts, and low cost solution for A C/DC po wer app lications. The special Green-Power function provides off-time modulation to linearly decrease the switching frequency under ight-load conditions. And under zero-load conditions, the power supply enters burst-mode to 8-Lead Plastic SO-8 Package Code: S further reduce power consumption b y shutting off P WM output. When the output of power supply is short or over loaded, the FB voltage will increase, and if the FB voltage is higher than 5.2V f or longer th an 56msec the PWM out put will be turned off. A external NTC resi stor connected from pin RT to ground can be applied to over- temperature protection. Pulse...
