1. The pwm control chip of hm2269 power chip circuit diagram is OB2269aphm2269 power chip circuit diagram , The starting voltage is 12Vhm2269 power chip circuit diagram , the working voltage is 22v, the secondary voltage is 8V and 26V, the feedback voltage is 5V, the power supply voltage cannot be higher than 25V, otherwise the coreLow current (55μA), wide voltage regulator range, full protection function. The model with the blue line in the image below, or 2A265, is directly interchangeable.
This should be an original import, and relatively speaking, this brand is still better, can achieve a very good effect.
OB2269 is a power management IC chip in an 8-pin package process with low performanceStandby power consumption, lower starting current, lower working current, built-in front blanking, built-in OCP compensation, MOSFET soft driver, etc., it is widely used in laptop power adapters. Computer/TV/set-top box power supply, charger and other occasions. OB2269 adopts DIP-8 and SOP-8 packaging processes.
Fast. OB2269 is a power management IC chip using 8-pin package technology, which has low standby power consumption, lower start current, lower operating current, built-in front blanking, built-in OCP compensation, buffer time is relatively short, and speed is very highQuick.
Power or choose a good point, after upgrading, replacing, chassis power can be kept, Hang Jia new jumper450B bronze power supply, Jingdong 269, there is no reason to choose Onda. Zhenhua cost-effective, war butterfly 400 Jingdong 209. AOC 25 inch no problem, I use this, AOC is the world's largest display manufacturer, Philips display has been acquired by it, many of the market is his contract manufacturing.
LCD display 1 3775 Samsung 2493HM chassis 1 440 Hanga SpartaThe most likely problem '>2269 power chip the most likely problem
The power chip is most prone to low voltage problems. OB2269 is a power management IC chip using 8-pin package technology, with low standby power consumption, lower starting current, lower operating current, built-in front blanking, built-in OCP compensation, MOSFET soft driver, etc., it is widely used in notebook computer power adapters. Computer/TV/set-top box power supply, charger and other occasions. OB2269 adopts DIP-8 and SOP-8 packaging processes.
YouGood: ①, power supply to the 0B2269CP 7 pin normal typical value of 15V chip internal circuit all start, at this time the entire power supply into the normal working state. 2, the chip 8 pin no drive pulse output, the internal circuit of the chip may not work, so there is no output. (3) Focus on the above problems to check, chip 7 pin power supply circuit components can be.
From the use of IC, the maximum can be 100w. This is actually close to the limit of common flyback power supplies.