Sixth energy efficiency primary feedback switch power management ICDK1203 replacement RM63XX power supply IC six energy efficiency primary feedback switch power management ICDK1203 replacement RM63XX secondary feedback power drive ICDK1203 main feature Input voltage 85V to 265V full voltage range Built-in 700V power tube Create from the power supply circuit (patent), no need for auxiliary winding power supply Integrated self-starting circuit Current mode PWM control VCC operating voltage range 4V to 6V 65kHz switching frequency Automatically enter the jump cycle mode when light load Over temperature, overcurrent, Overvoltage, overload protection Standby power consumption is less than 0.3W frequency jitter reduction EMI filter cost ◆ Secondary feedback power driver ICDK1203 limit parameter supply voltage VCC ......................................................................... .................................... - 0.3V - 8V power supply current VCC ....................................................................................................... ... 100mA pin voltage ..................................................................................................... - 0.3V - VCC + 0.3V Power Tube withstand ................................................................................... - 0.3V - 730V Power Tube Current .............................. ................................................................................................................... " .................. 800mA total dissipation power ............................................................................................................................................ ........................................................................ -20 C - + 125 C storage temperature .................................... ....................................................... - 55 C - + 150 C welding temperature ......................................................................... ...................................... +280 C / 5S ◆ Sub-side feedback power supply ICDK1203 Electrical parameter item test conditions Minimum typical maximum unit power supply voltage VCCAC input 85V ------ 265V456V start voltage VCCAC input 85V ------ 265V4.855.2V Off Voltage VCCAC Enter 85V ------ 265V3.644.2V Power Current VCC = 5V, FB = 2.2V102030MA Start Time AC Enter 85V ------ 500MSOC Protection Voltage L = 1.2MH460480500V power tube withstand voltage IOC = 1MA700 ------ V power tube maximum current VCC = 5V, fb = 1.6V --- 3.6V600660700MA peak current protection VCC = 5V, FB = 1.6V --- 3.6V650720800MA 掁 掁 frequency VCC = 5V, FB = 1.6V --- 2.8V506570KHz Variable frequency frequency Vcc = 4.6V, fb = 2.8V --- 3.6V0.05 --- 65kHz shake frequency VCC = 4.6V, FB = 1.6V --- 2.8V0.811.2KHz temperature protection VCC = 4.6V , Fb = 1.6V --- 3.6V120125130 CPWM duty cycle VCC = 4.6V, fb = 1.6V --- 3.6V5 --- 75% control voltage FBAC input 85V ------ 265V1.6-- -3.6V Secondary Feedback Power Supply Drive ICDK1203 Transformer Design (Refer to Reference) 2.1 When the parameter determines the transformer design, you need to first determine some parameters as follows: (1) Input voltage range: AC85V ~ 265V (2) Output voltage and current: DC12V / 1A (3) Switching frequency: FREQ = 65kHz (4) maximum duty cycle: D = 0.52.2, the selective secondary feedback power supply driver ICDK1203 first calculate the input power of the power supply P = Pout / ( switch The efficiency of the power supply is 0.8), and Pout = Vout * Iout = 12V * 1A = 12W, that is, P = 12W / 0.8 = 15W. We can choose through the chart provided by the manufacturer of magnetic core, or by calculation, we check the 15W power supply available EE20 or EE25 magnetic core, we choose EE25 magnetic core to perform the next calculation. Sub-side feedback power supply ICDK12032.3, calculate the original edge voltage VS input voltage is AC85V ~ 265V, calculate the maximum power under the lowest voltage, when the voltage is 85V, VS = 85 * 1.3 = 110V (considering line pressure drop and rectification Pressure drop). The secondary feedback power supply ICDK1203 power device is required to heat dissipation, the main heat of the chip is connected to the power tube, the power tube is connected to the pins 7, 8, so when the PCB wiring should, the pins 7, 8 external copper foil The area is increasing and tinned to increase heat dissipation. 2, the 7, 8 pin of the chip is the high pressure part of the chip, and the maximum voltage can reach more than 600V, so it is necessary to ensure a safe distance of 1.5 mm or more on the line arrangement to avoid breakdown discharge in the circuit. Read more
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