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RT8560 Datasheet(PDF) 14 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) 14 Page - Richtek Technology Corporation

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RT8560
14
DS8560-01 April 2011
www.richtek.com
)
OUT
IN
OUT
OUT
RIPPLE
OUT
(V
V
I
C
=
VV
f
η
−×
××
×
Layout Guideline
PCB layout is very important for designing power switching
converter circuits. Some recommended layout guides that
should be strictly be followed are shown as follows :
The power components L, D, CVIN, COUT1 and COUT2
must be placed as close as possible to reduce the ac
current loop. The PCB trace between power components
must be as short and wide as possible due to large
current stream flows through these traces during
operation.
Place L and D connected to SW pin as close as possible.
The trace should be short and wide as possible.
It is recommended to place CVcc1 and CVcc2 close to
VCC1 and VCC2 pins.
Pin14 is the compensation point to adjust system
stability. Place the compensation components to pin14
as close as possible, no matter the compensation is
RC or capacitance.
Figure 9. PCB layout
OUT
OUT
IN
OUT
IN
PEAK
IN
OUT
VI
V
T V
V
I
=
V2 L
V
η
××
⎛⎞
+
⎜⎟
×× × ⎝⎠
Where,
VOUT = maximum output voltage.
VIN = minimum input voltage.
f = operating frequency.
IOUT = sum of current from all LED strings.
The boost converter operates in discontinuous mode over
the entire input voltage range when the L1 inductor value
is less than this value L. With an inductance greater than
L, the converter operates in continuous mode at the
minimum input voltage and may be discontinuous at higher
voltages.
The inductor must be selected with a saturated current
rating that is greater than the peak current provided by
the following equation :
Where,
η is the efficiency of the power converter.
Diode Selection
Schottky diode is a good choice for an asynchronous
Boost converter due to the small forward voltage. However,
power dissipation, reverse voltage rating and pulsating peak
current are the important parameters for Schottky diode
selection. Choose a suitable diode whose reverse voltage
rating is greater than the maximum output voltage.
Capacitor Selection
The input capacitor reduces current spikes from the input
supply and minimizes noise injection to the converter. For
most applications, a 10uF ceramic capacitor is sufficient.
A value higher or lower may be used depending on the
noise level from the input supply and the input current to
the converter.
It is recommended to choose a ceramic capacitor bases
on the output voltage ripple requirements. The minimum
value of the output capacitor COUT is approximately given
by the following equation :
1
2
3
4
5
15
14
13
12
11
6
7
89
10
20 19 18
16
17
LED4
GND
GND
GND
GND
SW
SW
EN
OVP
SS
VC
21
COUT1
COUT2
D
VOUT
COUT3
GND
GND
CVIN
L
CVCC1
CVCC2
RVCC2
RVCC1
GND
RVC
CVC1
CVC2
VIN
Place these components
as close as possible.
Locate the CVCC1 and CVCC2 as
close as possible to VCC1 and
VCC2 pin.
Locate the compensation
components to VC pin as
close as possible.


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