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BD6586MUV Datasheet(PDF) 9 Page - Rohm

Part # BD6586MUV
Description  White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type)
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD6586MUV Datasheet(HTML) 9 Page - Rohm

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Technical Note
9/19
www.rohm.com
2011.6 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
BD6586MUV
SW
SW
SW
TEST0
TEST
N.C.
ISET
EN2
LE D6
LE D5
LED 4
LED 3
LE D2
VBAT
EN1
GND
PWM
CVBAT
to GND
to Anode of each LED
BD6586MUV
to Power Supply
COUT
CIN
SBD
L
RISET
1
2
3
4
5
6
7
8
9
10
11
12
18
17
16
15
14
13
24
23
22
21
20
19
PWM
(100Hz~1000Hz)
to Anode of LED
to Power Supply
Thermal Via
Thermal Via
PCB Layout
In order to make the most of the performance of this IC, its layout pattern is very important. Characteristics such as efficiency
and ripple and the likes change greatly with layout patterns, which please note carefully.
Fig.9 PCB Layout
Connect the input bypath capacitor CIN nearest to coil L and PGND, as shown in the upper diagram.
Ripple of a power supply is smoothed by CIN and connect stable voltage to VBAT terminal by the low resistance. Thereby,
the input voltage ripple of the IC can be reduced.
Connect CVBAT nearest to between the VBAT terminal and GND (4 pin) as shown in the upper diagram when you can't be
wired by the low resistance from CIN to VBAT pin
Connect schottky barrier diode SBD of the regulator nearest to between coil L and SW terminal.
And connect output capacitor COUT nearest to between CIN and GND pin. Thereby, the output voltage ripple of the IC can
be reduced.
GND terminal (4,7,10 pin) is connected inside the IC, and it is GND of the block except switching and a transistor.
A current drive performance may be restricted by influence of a noise, if PGND which is not smooth connected to GND.
A GND terminal is connected to the stable GND plane. And connect it to a GND plane after smoothing PGND by CIN and
COUT. GND and PGND are separated inside IC.
And connect it to a GND plane after smoothing PGND by CIN and COUT.
Connect the heat sink of IC to a GND plane through Thermal Via. And Connect with the largest possible pattern.
It is satisfactory even if it connects with the GND terminal of IC.
Connect LED current setting resistor RISET nearest to ISET pin. There is possibility to oscillate when capacity is added to
ISET terminal, so pay attention that capacity isn't added. And, RISET of GND side must be wired directly to GND(7pin) pin.
When those pins are not connected directly near the chip, influence is given to the performance of BD6586MUV, and may
limit the current drive performance. As for the wire to the inductor, make its resistance component small so as to reduce
electric power consumption and increase the entire efficiency.
A layout pattern in consideration of these is shown in p.12.


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