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RT9284B15PJ5 Datasheet(PDF) 11 Page - Richtek Technology Corporation

Part # RT9284B15PJ5
Description  Tiny Package, High Performance, Constant Current Switching Regulator for White LED
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9284B15PJ5 Datasheet(HTML) 11 Page - Richtek Technology Corporation

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11
RT9284A/B
DS9284A/B-05 August 2007
www.richtek.com
Figure 7. Filtered PWM Signal for LED Dimming Control
of RT9284A
0
2
4
6
8
10
12
14
16
18
20
0
1020
3040
50
6070
8090
100
PWM Duty (%)
Figure 8
Inductor Selection
The recommended value of inductor for 3 to 5 WLEDs
applications are 4.7 to 22
μH. Small size and better
efficiency are the major concerns for portable device, such
as RT9284A/B used for mobile phone. The inductor should
have low core loss at 1.2MHz and low DCR for better
efficiency. To avoid inductor saturation current rating should
be considered.
)
I
(I
(RMS)
I
PEAK
OUT
D
×
Capacitor Selection
Input and output ceramic capacitors of 1
μF are
recommended for RT9284A/B applications. For better
voltage filtering, ceramic capacitors with low ESR are
recommended. X5R and X7R types are suitable because
of their wider voltage and temperature ranges.
Diode Selection
Schottky diode is a good choice for RT9284A/B because
of its low forward voltage drop and fast reverse recovery.
Using Schottky diode can get better efficiency. The high-
speed rectification is also a good characteristic of
Schottky diode for high switching frequency. Current rating
of the diode must meet the root mean square of the peak
current and output average current multiplication as
following :
The diode
’ s reverse breakdown voltage should be larger
than the output voltage. SS0520 is recommended Schottky
diode for rectifier.
Layout Guide
A full GND plane without gap break.
VCC to GND noise bypass
–Short and wide connection
for the 1
μF MLCC capacitor between Pin6 and Pin2.
Minimized LX node copper area to reduce EMI.
Minimized FB node copper area and keep far away from
noise sources.
Figure 9. Top Layer
The LED current can be calculated by the following
equation.
PWM
FB
FB
DC
LED
R2 (V
Duty
V
)
V
R3 + R
I
=
R1
××
VDD
GND
LX
FB
OVP
RT9284A
VIN
EN
6
4
2
3
5
1
ILED
2.7V to 5.5V
C1
C2
R1
D1
SS0520
L1
4.7uH to 22uH
R2
PWM Signal
R3
110
10k
10k
2.8V
0V
RDC
3k
CDC
1uF
VEN > 1.5V
VEN < 0.4V


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