The A6214 is a single-IC switching regulator that provides
constant-current output to drive high-power LEDs. It integrates
a high-side N-channel DMOS switch for DC-to-DC step- down
(buck) conversion. A true average current is output using a
cycle-by-cycle, controlled on-time method.
Output current is user-selectable by an external current sense
resistor. Output voltage is automatically adjusted to drive
various numbers of LEDs in a single string. This ensures the
optimal system efficiency.
LED dimming is accomplished by a direct logic input
pulse-width-modulation (PWM) signal at the Enable pin.
Alternatively, an Analog Dimming input can be used to calibrate
the LED current, or implement thermal foldback in conjunction
with external NTC thermistor.
The A6216 has the added capability to generate its own PWM
dimming frequency and duty cycle in stand-alone mode.
The A6214 is provided in a compact 10-pin narrow SOIC
package (suffix LK). The A6216 is in 16-pin TSSOP (suffix
LP), both with exposed pad for enhanced thermal dissipation.
It is lead (Pb) free, with 100% matte-tin leadframe plating.
Applications
Automotive lighting:
- Daytime running lights
- Front and rear fog lights
- Turn/stop lights
- Map light
- Dimmable interior lights
