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RT8560 Datasheet(PDF) 13 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) 13 Page - Richtek Technology Corporation

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RT8560
13
DS8560-01 April 2011
www.richtek.com
Where,
VRISET is the voltage of the RISET pin (1.21V typ.) and the
RISET is the resister between RISET pin and GND.
This setting is the reference for the LED current at LED1-
4 and represents the sensed LED current for each string.
The DC/DC converter regulates the LED current according
to the setting.
Brightness Control
The RT8560 features both analog and digital dimming
control. Analog dimming is linearly controlled by an
external voltage (0.3V < VACTL < 1.2V). With an on-chip
output clamping amplifier and a 200k
Ω resistor, PWM
dimming signal is easily low-pass filtered to an analog
dimming signal with one external capacitor for noise-free
PWM dimming. A very high contrast ratio true digital PWM
dimming can be achieved by driving ACTL pin with a PWM
signal and suggest PWM frequency is from 200Hz to
10kHz. Refer to Figure 8, the minimum dimming duty can
be as low as 1% for the frequency range from 100Hz to
300Hz. For the dimming frequency from 300Hz to 1kHz,
the duty is about 5%. If the frequency is increased to
1kHz to 30kHz, the duty will be about 10%.
LED Current vs. ACTL PWM Duty Cycle
0
2
4
6
8
10
12
14
16
18
20
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100
%
Duty Cycle (%)
ACTL = 200Hz
ACTL = 1kHz
ACTL = 10kHz
ACTL = 20kHz
ACTL = 30kHz
ACTL = 0V to 3V, VIN = 12V
0
10
20
30
40
50
60
70
80
90
100
Figure 8. LED Current vs. PWM Dimming Duty Cycle
Over Voltage Protection
The RT8560 equips over voltage protection (OVP) function.
When the voltage at OVP pin reaches a threshold of
approximately 2.5V, the MOSFET drive output (SW) will
turn
“OFF”. The MOSFET drive output (SW) will turn
“ON” again once the voltage at OVP drops below the
threshold of approximately 2.5V.
So, the output voltage can be clamped at a certain voltage
level and it can be calculated by the following equation :
OUT, OVP
R1
V
= 2.5
1+
R2
⎛⎞
×⎜⎟
⎝⎠
Where,
R1 and R2 are the voltage divider connected to OVP pin.
If at least one string is in normal operation, the controller
will automatically ignore the open strings and continue to
regulate the current for the string(s) in normal operation.
Current-limit Protection
The RT8560 can limit the peak current to achieve over
current protection. The RT8560 senses the inductor
current of on period that flows through SW pin. The duty
cycle depend on current signal and internal slope
compensation compared with error signal. The internal
N-MOSFET will be turned off when the current signal is
large than internal slope compensation. In the off period,
the inductor current will be descended until the internal
N-MOSFET is on by the oscillator.
Over Temperature Protection
The RT8560 has over temperature protection (OTP)
function to prevent the excessive power dissipation from
overheating. OTP will shut down the IC while junction
temperature exceeds 150
°C. Main converter starts
switching once the junction temperature is cooled
approximately 20
°C.
Inductor Selection
The value of the output inductor (L), where the transition
from discontinuous to continuous mode occurs is
approximated by the following equation :
)
2
2
OUT
IN
IN
OUT
OUT
(V
V
V
L =
2I
f V
−×
×× ×


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