General Description
QX5241 is a step-down high-brightness LED constant-current driver with high accuracy.
A high-side current-sense resistor adjusts the output current, which minimizes the number of external components while delivering an LED current with ±1% accuracy, and a dedicated PWM input (DIM) makes a wide range of pulsed dimming feasible.
A hysteretic control algorithm ensures excellent input-supply rejection and fast response to load transients and PWM dimming. QX5241 features a 20% inductor current ripple and operates up to 1MHz switching frequency.
QX5241 is well suited for applications requiring a wide input voltage range from 5.5V to 36V, and operates over the -20℃ to 85℃ automatic temperature range.
Features
Ø Maximum Output Current: 2.5A
Ø High Efficiency: 96%
Ø High-side Current Sense
Ø Maximum Dimming Frequency: 5KHz
Ø Hysteretic Control: No Compensation
Ø Maximum Operating frequency: 1MHz
Ø High Current Accuracy: Up to ±1%
Ø Wide input voltage range: 5.5V to 36V
Ø Maximum Output Power: 25W
Ø 5V, 5mA On-chip Regulator
Applications
Ø Architectural, Industrial, and Ambient Lighting
Ø MR16 and Other LED Bulbs
Ø Automotive Lighting
