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RT8511B Datasheet(PDF) 8 Page - Richtek Technology Corporation

Part # RT8511B
Description  43V Asynchronous Boost WLED Driver
Download  11 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8511B Datasheet(HTML) 8 Page - Richtek Technology Corporation

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RT8511B
8
DS8511B-05
February 2015
www.richtek.com
©
Copyright
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Mode2
Mode3
Figure 4. Power On Sequence
Mode1
Mode2
Mode3
Figure 5. Power Off Sequence
VIN
VOUT
soft-start
EN
VIN
VOUT
EN
PWM
soft-start
VIN
VOUT
EN
PWM
VIN
VOUT
EN
PWM
VIN
VOUT
EN
PWM
Shutdown
Delay
Mode1
VIN
VOUT
soft-start
EN
PWM
Soft-Start
The RT8511B provides a built-in soft-start function to limit
the inrush current, while allowing for an increased PWM
frequency for dimming.
Current Limiting Protection
The RT8511B can limit the peak current to achieve over
current protection. The IC senses the inductor current
through the LX pin in the charging period. When the value
exceeds the current limiting threshold, the internal N-
MOSFET will be turned off. In the off period, the inductor
current will descend. The internal MOSFET is turned on
by the oscillator during the beginning of the next cycle.
Power Sequence
In order to assure that the normal soft-start function is in
place for suppressing the inrush current, the input voltage
and enable voltage should be ready before PWM pulls
high. Figure 4 and Figure 5 show the power on and power
off sequences.


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