MIC2845 datasheet(13/21 Pages) MICREL

Part #	MIC2845

Description	6 Channel High Side Current Source WLED driver

PDF	21 Pages

Scroll/Zoom	100%

Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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13 / 21 page

Micrel Inc.

MIC2845/46

January 2008

M9999-010808-A

Application Information

MIC2845 PWM Dimming Interface

The MIC2845 can receive PWM signals from the END

pin for WLED dimming. The frequency of the PWM

signal should be between 200Hz – 1kHz and the duty

cycle can range from 1% to 100%. Dimming is

generated by pulsing the WLEDs on and off in

synchronization with the PWM signal. An internal

shutdown delay ensures that the internal control circuitry

remains active during PWM dimming for optimum

performance. Figure 4 through Figure 8 show the WLED

current response when a PWM signal is applied to the

END pin.

Figure 4. PWM Signal at 1% Duty Cycle

Figure 5. PWM Signal at 20% Duty Cycle

Figure 6. PWM Signal at 50% Duty Cycle

Figure 7. PWM Signal at 80% Duty Cycle

Figure 8. PWM Signal at 100% Duty Cycle

MIC2845 Datasheet(PDF) 13 Page - Micrel Semiconductor