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RT9285AGQW Datasheet(PDF) 4 Page - Richtek Technology Corporation

Part # RT9285AGQW
Description  Tiny Package, High Performance, Diode Embedded White LED Driver
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9285AGQW Datasheet(HTML) 4 Page - Richtek Technology Corporation

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RT9285A/B
Preliminary
4
DS9285A/B-02 August 2007
www.richtek.com
PWM Dimming (RT9285B)
For controlling the LED brightness, the RT9285B can perform the dimming control by applying a PWM signal to EN pin.
A low pass filter is implemented inside chip to reduce the slew rate of ILED to prevent the audio noise. The average LED
current is proportional to the PWM signal duty cycle. The magnitude of the PWM signal should be higher than the
maximum enable voltage of EN pin, in order to let the dimming control perform correctly.
EN
I
WLED
I
WLED, AVG
= Duty of EN
Figure 2
Figure 1
Feedback Voltage
Time
Symbol
Increase
0.5
µs to 75µs
TUP
Decrease
180
µs to 300µs
TDOWN
Delay between steps
> 0.5
µs
TDELAY
Shutdown
> 1ms
TSHDN
Table 2
Current Limiting
The current flow through the inductor as charging period is detected by a current sensing circuit. As the value over the
current limiting, the NMOS will be turned-off so that the inductor will be forced to leave charging stage and enter discharging
stage. Therefore, the inductor current will not increase over the current limiting.
T
DOWM
T
UP
T
DELAY
T
SHDN
EN
I
WLED
Shut-down
100%
15/16
100%
Shut-down


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