Shenzhen DongKe Semicon DK112

DK112 is a dedicated low-power switching power supply control IC, widely used in power adapters, LED power supplies, induction cookers, air conditioners, DVD players, and other small household appliances.

• Dual-chip design: high-voltage switching transistor uses bipolar transistor design to reduce product cost; control circuit uses large-scale MOS digital circuit design with emitter-drive topology to drive the bipolar transistor chip, enhancing the safe voltage rating of the high-voltage switching transistor
• Built-in self-powered circuit eliminates the need for an external power supply to the chip, effectively reducing external component count and cost
• Integrated high-voltage constant-current startup circuit eliminates the need for an external startup resistor
• Built-in overcurrent protection, overload protection, output short-circuit protection, thermal protection, and optocoupler failure protection circuits
• Built-in slope compensation circuit ensures circuit stability at low voltage and high power output
• Built-in PWM oscillator with frequency dithering function for excellent EMC performance
• Built-in frequency conversion function automatically reduces operating frequency during standby, meeting European green energy standards (< 0.3W) while reducing output voltage ripple
• Built-in high-voltage protection: automatically shuts down and performs delayed restart when the input bus voltage exceeds the protection threshold
• Built-in ramp current drive circuit reduces chip power dissipation and improves circuit efficiency
• 4KV ESD protection tested

• Power adapters
• LED power supplies
• Induction cookers
• Air conditioners
• DVD players and other small home appliances