KP2124DP

KP212X is a high-performance primary-side controller delivering high-accuracy constant voltage (CV) and constant current (CC) output performance, particularly suited for low-power offline charger applications. KP212X also supports quasi-resonant buck-type LED CC/CV output applications — simply short the SEL pin to the GND pin to enable this mode. In CV output mode, KP212X employs a multi-mode operation combining amplitude modulation (AM) and frequency modulation (FM) control, improving system efficiency and reliability. In CC output mode, the device uses FM control with integrated line voltage and load voltage CC compensation. KP212X operates noise-free while ensuring excellent dynamic performance. The integrated line-loss compensation function enables high-performance CV output. KP212X integrates multiple protection features: VDD undervoltage lockout (UVLO), VDD overvoltage protection (OVP), cycle-by-cycle overcurrent protection (OCP), short-circuit protection (SLP), and VDD clamping.

Applications

• Mobile phone chargers
• AC adapters
• LED lighting

Key features

• Integrated 650V MOSFET
• Supports flyback and buck topology applications
• Flyback primary-side control (SEL pin floating)
• Quasi-resonant buck control (SEL < GND)
• ±4% constant current/constant voltage accuracy
• Standby power consumption <70mW
• Multi-mode primary-side control
• Noise-free operation
• Optimized dynamic response
• Adjustable line loss compensation
• Integrated constant current compensation for line voltage and load voltage
• Comprehensive integrated protection features:
• Short circuit protection (SLP)
• Over-temperature protection (OTP)
• Cycle-by-cycle current limiting protection (OCP)
• Leading edge blanking (LEB)
• Pin floating protection
• VDD over/under-voltage protection and clamp protection
• Package: SOP-7/8, DIP-7/8