NCP1370BDR2G

Overview

The NCP1370BDR2G is a dimmable quasi-resonant primary side current-mode controller designed for LED TV backlight applications. It targets isolated flyback and non-isolated constant current topologies, operating at a fixed frequency of 65 kHz with an input voltage range of 9.5 V to 26 V. The device delivers up to 800 mA output current in a single-channel configuration housed in an SOIC-8 package. It supports adjustable output voltage and features a maximum supply current of 5 mA across an operating temperature range of -40 °C to +125 °C.

Feature Summary

• Enables precise constant LED current regulation from the primary side, eliminating the need for secondary feedback circuits, biasing networks, or opto-couplers.
• Operates in quasi-resonant mode to optimize efficiency by switching at MOSFET drain-source voltage valleys while avoiding unstable valley hopping.
• Supports analog and digital dimming modes, which can be combined to enhance dimming precision and flexibility for various display requirements.

Applications

• LED TV backlight controllers
• LED TV power supplies
• LED light engines

Procurement Notes

Verify the specific suffix 'B' against the official datasheet to confirm fault handling behavior, as Version B waits four seconds before restarting after certain faults compared to other versions. Ensure the SOIC-8 package dimensions and moisture sensitivity level align with assembly requirements. Confirm RoHS compliance status through the manufacturer's latest product change notifications prior to finalizing procurement orders.

Selection Notes

Select this component when designing isolated flyback or non-isolated constant current LED drivers that require high efficiency without secondary side sensing. It is suitable for applications needing programmable peak current limits and robust protection against open/shorted LEDs. Consider its compatibility with analog and PWM dimming signals if variable brightness control is required for the target display system.

Part Context

This part belongs to the NCP1370 series of offline controllers manufactured by onsemi. It is specifically engineered for LED lighting driver ICs within the PMIC category. The series focuses on simplifying design through high integration and reduced external component counts while maintaining strict safety standards for consumer electronics backlighting systems.

Replacement Considerations

The NCP1370ADR2G is a documented variant within the same family. Verify functional equivalence regarding fault handling logic and pinout compatibility before substitution. No other direct public substitutes are confirmed in the provided documentation.

FAQ

How does the NCP1370BDR2G regulate LED current without an opto-coupler?

It uses a novel primary side sensing method to precisely regulate constant LED current, removing the need for secondary side feedback circuitry and opto-couplers.

What protection features are included for LED faults?

The device includes protection against secondary diode shorts, open and shorted output LEDs, VCC undervoltage/overvoltage, and brown-out conditions.