HVLED002

Overview

The HVLED002 is a high-performance current mode LED controller IC designed for fixed frequency operation. It supports buck and inverse buck topologies with an internal trimmed oscillator guaranteed at 250 kHz, extendable to 500 kHz. The device operates within a supply voltage range of 7 V to 25 V and features a precision reference with undervoltage lockout. It utilizes cycle-by-cycle latching PWM for current limiting and includes a low-impedance totem pole output stage suitable for driving N-channel MOSFETs. The component is available in an 8-SOIC package and functions without an internal switch.

Feature Summary

• Current mode control architecture with precise duty cycle regulation via internal trimmed oscillator
• Cycle-by-cycle current limiting through latching PWM comparator
• High-current totem pole output stage optimized for N-channel MOSFET drive
• Integrated undervoltage lockout with hysteresis and precision reference

Applications

• Inverse buck LED drivers for street lighting
• Offline AC/DC LED driver implementations
• Dimmable LED systems requiring analog or PWM control
• High-efficiency industrial and sports lighting power supplies

Procurement Notes

Verify the specific ordering suffix (e.g., TR for tape and reel) against the required packaging format before finalizing orders. Confirm that the application environment remains within the specified -40°C to +150°C junction temperature range. Ensure input voltage constraints do not exceed the maximum 25 V limit for the controller supply rail. Cross-reference datasheet revisions to confirm pin compatibility and electrical characteristics match the design requirements.

Selection Notes

Select this controller for applications requiring fixed-frequency current mode regulation without integrated power switches. It is suitable for designs needing external N-channel MOSFETs driven by a robust totem pole output. Consider its capability for both analog and PWM dimming inputs when designing variable intensity lighting systems. Verify that the external shunt resistor network aligns with the desired output current levels supported by the error amplifier input.

Part Context

The HVLED002 belongs to STMicroelectronics' dedicated LED driver portfolio, often paired with offline controllers like the HVLED001B in multi-stage solutions. It serves as the secondary stage controller in inverse buck topologies, managing output current regulation while the primary stage handles power factor correction. This separation allows for optimized efficiency and flexible dimming strategies in high-power LED fixtures.

Replacement Considerations

The HVLED001B is documented as a complementary controller in similar architectures but serves different topology roles. No direct functional substitutes are explicitly confirmed in public documentation. Evaluate alternative ST LED controllers based on specific topology requirements and switching frequency needs.

FAQ

Does the HVLED002 include an internal power switch?

No, the HVLED002 does not contain an internal switch; it requires an external N-channel MOSFET driven by its totem pole output stage.

What is the guaranteed operating frequency of the internal oscillator?

The internal trimmed oscillator is guaranteed at 250 kHz, though the device supports current mode operation up to 500 kHz.

How does the device handle overcurrent conditions?

It employs a latching PWM comparator that provides cycle-by-cycle current limiting to protect the circuit during abnormal conditions.