Stage light no flicker and no noise design IC scheme
Description
H6228 adopts linear dimming and PWM dimming. 65536 (256*256) level high brightness dimming.
H6228 is a high-precision step-down LED constant current driver chip with high efficiency, few external components, and external power MOS tube that adopts PWM working mode. It is suitable for 4-48V input.
The output current is adjustable from 60mA to 1.25A (according to the heat dissipation conditions).
The operating frequency of H6228 can be set by external resistor programming, and the built-in frequency jitter circuit can reduce EMI interference to other equipment. In addition, the peak current sampling mode is adopted to improve the current accuracy under wide input voltage conditions.
H6228 has the functions of output short-circuit protection and over-temperature regulation current.
The H6228 adopts high-end current detection, and the output current accuracy is ±5%. The output current is insensitive to the input, output voltage and inductance. The internal loop compensation is integrated, and the peripheral circuit is simple and reliable.
The H6228PWM port supports PWM dimming with a small duty cycle, and can respond to PWM pulse width waveforms less than 100ns. The PWM port is high, the chip works normally, and the low-level chip output is turned off.
Features: Wide input voltage range
4V～48V, current range can be set
Built-in 15mA～1200mA fixed off-time control built-in frequency jitter circuit
Reduce EMI interference to other equipment
Dimming depth up to 0.1%
Working frequency up to 1MHz
Can do multiple common anode output
Strong anti-interference adopts SOT89-5 package
Typical schematic diagram: