POWER INTEGRATIONS INN2003K-TL

The InnoSwitch-CH family of ICs dramatically simplifies the development and manufacturing of low-voltage, high current power supplies, particularly those in compact enclosures or with high efficiency requirements. The InnoSwitch-CH architecture is revolutionary in that the devices incorporate both primary and secondary controllers, with sense elements and a safety-rated feedback mechanism into a single IC. Close component proximity and innovative use of the integrated communication link permit accurate control of a secondary-side synchronous rectification MOSFET and optimization of primary-side switching to maintain high efficiency across the entire load range. Additionally, the minimal DC bias requirements of the link enables the system to achieve less than 10 mW no-load in challenging applications such as smart-mobile device chargers. The InnoSwitch-CH combines a high-voltage power MOSFET switch and both primary-side and secondary-side controllers in one device. The feedback scheme using a proprietary FluxLink coupling scheme using the package lead frame and bond wires to provide a reliable and low-cost means to provide accurate direct sensing of the output voltage and output current on the secondary to communicate information to the primary IC. Unlike conventional PWM (pulse width modulated) controllers, it uses a simple ON/OFF control to regulate the output voltage and current. The primary controller consists of an oscillator, a receiver circuit magnetically coupled to the secondary controller, current limit state machine, 5.95 V regulator on the PRIMARY BYPASS pin, overvoltage circuit, current limit selection circuitry, over temperature protection, leading edge blanking and a 650 V power MOSFET. The InnoSwitch-CH secondary controller consists of a transmitter circuit that is magnetically coupled to the primary receiver, constant voltage (CV) and constant current (CC) control circuitry, a 4.45 V regulator on the SECONDARY BYPASS pin, synchronous rectifier MOSFET driver, frequency jitter oscillator and a host of integrated protection features.

• Incorporates flyback controller, 650 V MOSFET, secondary-side sensing and synchronous rectification driver
• Integrated FluxLink, HIPOT-isolated, feedback link
• Exceptional CV/CC accuracy, independent of transformer design or external components
• Instantaneous transient response ±5% CV with 0%-100%-0% load step
• <10 mW no-load at 230 VAC when supplied by transformer bias winding
• Easily meets all global energy efficiency regulations
• Low heat dissipation
• Primary sensed output OVP
• Secondary sensed output overshoot clamp
• Secondary sensed output OCP to zero output voltage
• Hysteretic thermal shutdown
• 100% production HIPOT compliance testing equivalent to 6 kV DC/1 sec
• Reinforced insulation
• Isolation voltage >3,500 VAC
• UL1577 and TUV (EN60950 and EN62368) safety approved
• EN61000-4-8 [100 A/m) and EN61000-4-9 (1000 A/m) compliant
• Halogen free and RoHS compliant

• Chargers and adapters for smart mobile devices
• High efficiency, low voltage, high current power supplies