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RT8560 Datasheet(PDF) 12 Page - Richtek Technology Corporation

Part # RT8560
Description  High Voltage 4 Channel LED Driver
Download  15 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8560 Datasheet(HTML) 12 Page - Richtek Technology Corporation

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RT8560
12
DS8560-01 April 2011
www.richtek.com
Applications Information
The RT8560 is a current mode boost converter operated
at 1MHz to power up to 60 white LEDs with a
programmable current for uniform intensity. The part
integrates current sources, soft-start, and easy analog
and digital dimming control. The protection block provides
the circuitry for over-temperature, over-voltage and current-
limit protection features.
Input UVLO
The input operating voltage range of the RT8560 is 7V to
40V. An input capacitor at the VCC1 and VCC2 pin can
reduce ripple voltage. It is recommended to use a ceramic
10uF or larger capacitance as the input capacitor. This IC
provides an under voltage lockout (UVLO) function to
enhance the stability when startup. The UVLO threshold
of input rising voltage is around 6.2V.
Power Sequence
Please refer to the below Figure 5 and 7. The
recommended power-on sequence is that the PWM ready
before EN and/or VIN ready. If not, the Soft-Start function
will be disabled. As to power-off sequence, the EN/VIN
must be pulled low within 10ms to prevent
“Hard-Start”
shown as Figure 7.
LED
ISET
5.36k
I
= 20mA
R
×
Soft Start
The RT8560 employs a soft start feature to limit the inrush
current. The soft-start circuit prevents the excessive inrush
current and input voltage droop. The soft-start time is
determined by capacitor CSS connected to SS with a 7uA
constant current to charge CSS. The value of capacitor
CSS is user-defined to satisfy designer' requirement.
LED connection
The RT8560 equips 4 channel LED divers and each channel
supports up to 15 LEDs. The 4 LED strings are connected
from VOUT to pin 15, 16, 17 and 18 respectively. If one of
the LED channel is not used, the LED pin should be
opened directly.
Setting and Regulation of LED current
The LED current can be calculated by the following
equation :
EN must be turned
on late than VIN
and PWM signal
EN must be turned
off early than VIN
and PWM signal
Power-on
sequence
EN
VIN
PWM
Power-off
sequence
UVLO
VOUT
Soft-Start
No Soft-Start
Abnormal Power-
on sequence
If PWM turns
on late
Figure 5. Power-On Sequence Control by EN
VIN must be
turned on late
than EN and
PWM signal
VIN must be turned
off early than EN and
PWM signal
Power-on
sequence
EN
VIN
PWM
Power-off
sequence
UVLO
VOUT
Soft-Start
No Soft-Start
Abnormal Power-
on sequence
If PWM turns
on late
Figure 6. Power-On Sequence Control by VIN
PWM
EN/VIN
EN and/or VIN should be
pulled low once PWM pull low
for over 10ms
10ms
Figure 7. To Prevent
“Hard-Start” Sequence


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