Power Integrations INN2023K-TL

Product Summary INN2023K-TL InnoSwitch-CH Series by Power Integrations

The INN2023K-TL is a highly integrated off-line CV/CC flyback switcher IC belonging to the InnoSwitch-CH family, manufactured by Power Integrations. Optimized for high efficiency and compact footprint, the device is ideally suited for the design of low-voltage, high-current power supplies—such as those used in mobile device chargers and adapters. Housed in the safety-compliant eSOP-R16B package, INN2023K-TL features an integrated 650 V MOSFET, synchronous rectification driver, secondary-side sensing, and innovative isolated feedback via FluxLink™ technology. These characteristics address growing demands for regulatory compliance, energy efficiency, and robust protection in consumer and industrial power applications.

System Structure and Major Functions of the INN2023K-TL InnoSwitch-CH

The architecture of INN2023K-TL brings together both primary- and secondary-side controllers within a single IC. At its core, the device utilizes the proprietary FluxLink™ for HIPOT-isolated feedback communication, delivering exceptional constant voltage (CV) and constant current (CC) regulation accuracy independent of transformer variations or external component tolerances.

Key features include:

Integration of flyback controller and 650 V MOSFET for primary-side switching.

Secondary-side sensing and synchronous rectification, maximizing efficiency across all load conditions.

Ultra-fast transient response (±5% CV within 0–100% load step).

Achieves <10 mW no-load power at 230 VAC (with transformer bias winding), ensuring compliance with global efficiency standards.

EcoSmart™ technology for reduced heat dissipation and minimal standby losses.

Halogen-free and RoHS-compliant package.

Built-in Protection and Safety Features of the INN2023K-TL InnoSwitch-CH

To address stringent safety and reliability requirements, the INN2023K-TL integrates a comprehensive suite of protection mechanisms:

Primary and secondary sensed output overvoltage protection (OVP), with primary-side OVP latch functionality.

Secondary output overshoot clamp and output overcurrent protection (OCP) to zero output voltage.

Hysteretic thermal shutdown, where MOSFET switching is disabled above 142 °C and re-enabled after a 75 °C drop, protecting against fault-induced board overheating.

Auto-restart operation for output overload and short-circuit events, alternating disabling/enabling MOSFET switching until fault conditions are cleared.

Safe Operating Area (SOA) protection, with cycle skipping to prevent transformer saturation during consecutive current limit events.

Full regulatory compliance: reinforced insulation and HIPOT testing equivalent to 6 kV DC/1 sec, isolation voltage >3,500 VAC, UL1577, TUV (EN60950, EN62368), EN61000-4-8 and EN61000-4-9.

Performance Specifications and Output Capacity of the INN2023K-TL InnoSwitch-CH

The output power performance of INN2023K-TL is defined for continuous operation in typical enclosed adapters and open-frame designs. For instance, in a universal input 5 V, 2 A charger scenario, designers can expect sustained performance at high ambient temperatures provided heat sinking principles are observed (SOURCE pin temperature ≤110 °C). Minimum continuous power ratings, peak power capabilities, and current limit selections are detailed in the manufacturer's output power table, enabling precise supply design for target load profiles. The current limit state machine dynamically reduces current threshold under medium and light loads, ensuring high efficiency and excellent regulation across variable conditions.

Common Use Cases for the INN2023K-TL InnoSwitch-CH

A representative engineering application is a 5 V, 2 A universal input switch-mode charger. By leveraging secondary-side synchronous rectification, the INN2023K-TL enables designers to substitute expensive Schottky diodes with standard MOSFETs—both reducing BOM costs and increasing efficiency. The built-in ON/OFF control dynamically adjusts switching cycles to match output demand, resulting in high efficiency during stand-by and rapid transient load response. Features such as cable drop compensation (for 5 V designs) address voltage drop issues in portable device charging scenarios. The IC's architecture ensures accurate current and voltage regulation throughout CV/CC operation, ideal for smart device chargers.

Design Approach and Implementation Advice for the INN2023K-TL InnoSwitch-CH

Effective realization of INN2023K-TL-based power supplies involves attention to several design principles:

Decoupling capacitors at PRIMARY BYPASS and SECONDARY BYPASS pins must adhere to manufacturer guidelines for capacitance and voltage rating (e.g., 0.1–10 μF X5R/X7R for primary bypass).

The bias winding on the transformer with suitable rectification/filtering establishes optimal startup and low no-load power consumption; proper turns ratio and resistor selection ensure minimal standby losses.

Primary-side snubber/clamp circuits (e.g., RCD clamp) are critical in limiting drain voltage spikes and EMI.

Output voltage feedback dividers and decoupling capacitors ensure stable regulation and ripple suppression.

The correct selection and placement of SR MOSFETs (preferably 18 mΩ R_DS(ON), low gate threshold) maximizes synchronous rectification efficiency.

PCB layout must focus on minimized loop areas for high-frequency paths, robust single-point grounding, effective heat sinking for SOURCE pins, and required safety clearances for creepage and ESD compliance.

Transformer design should achieve the correct primary inductance and reflected output voltage, with safety margins (creepage), primary layers, and low-loss cores for optimal thermal management and EMI performance.

Deployment Aspects Tailored to Applications for INN2023K-TL InnoSwitch-CH

Engineers must also take into account:

Practical output power is subject to input capacitance management, ambient temperature, board mounting, heat dissipation, and transformer tolerances.

Use of external protection diodes across ISENSE-SECONDARY GROUND for output voltages >5 V assures protection against capacitor discharge surges.

EMI reduction involves strategic component placement, common mode chokes, RC snubbers, and filter design.

Audible noise mitigation through transformer varnishing, capacitor selection, and optimized control settings.

Comprehensive bench validation under worst-case conditions is essential (e.g., maximum drain voltage/current, thermal checks).

Alternative or Substitute Devices Comparable to the INN2023K-TL InnoSwitch-CH

Within the InnoSwitch-CH family from Power Integrations, compatible models for replacement or up-/down-scaling include INN2023K-TL, INN2024K-TL, and INN2025K-TL, each offering graded drain current and output power capabilities. Selection should be based on application power rating, thermal constraints, and design requirements as outlined in the series output power table. These models maintain architectural consistency and feature set, enabling straightforward migration across device ratings without significant design revision.

Conclusion

: INN2023K-TL InnoSwitch-CH as a Strategic Choice for Power Supply Design

For engineers and procurement professionals tasked with developing compact, high-efficiency CV/CC power supplies, the INN2023K-TL InnoSwitch-CH establishes a benchmark in integration, ease of design, and regulatory compliance. With its robust feature set, advanced protection mechanisms, and proven energy efficiency performance, this device is particularly well-suited for next-generation charger and adapter designs facing stringent global market expectations. Cross-family alternatives within InnoSwitch-CH enable scalable solutions and future-proof engineering decisions, positioning the INN2023K-TL as a preferred selection for innovative power supply applications.