Texas Instruments LM3402/LM3402HV Constant Current Buck Regulators
Texas Instruments LM3402/LM3402HV Constant Current Buck Regulators are monolithic switching regulators designed to deliver constant currents to high-power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 735mA for step-down (Buck) regulators. Hysteretic control with controlled on-time is coupled with an external resistor. This allows the converter output voltage to adjust as needed to deliver a constant current to series and series - parallel-connected arrays of LEDs. They can be of varying number and type, LED dimming by pulse width modulation (PWM) or broken/open LED protection. Low-power shutdown and thermal shutdown complete the feature set available with this device.
Features
- Integrated 0.5A N-channel MOSFET
- VIN range from 6V to 42V (LM3402)
- VIN range from 6V to 75V (LM3402HV)
- 500mA output current overtemperature
- Cycle-by-Cycle current limit
- No control loop compensation required
- Separate PWM dimming and low power shutdown
- Supports all-ceramic output capacitors and capacitor-less outputs
- Thermal shutdown protection
- VSSOP, SO PowerPAD packages
Applications
- LED driver
- Constant current source
- Automotive lighting
- General illumination
- Industrial lighting
Associated Tools
Texas Instruments LM3404MREVAL High Power PSOP-8 Evaluation Board
Demonstrates the enhanced thermal performance and fast dimming of LM3402 and LM3404 buck regulators.
Texas Instruments LM3404FSTDIMEV LED Current Evaluation Board
Demonstrates the constant LED current capabilities of LM3402 and LM3404 buck regulators.
Block Diagram
Published: 2015-09-09
| Updated: 2022-03-11