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RT8525 Datasheet(PDF) 9 Page - Richco, Inc.

Part # RT8525
Description  Boost Controller with Dimming Control
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Manufacturer  RICHCO [Richco, Inc.]
Direct Link  http://www.richco-inc.com
Logo RICHCO - Richco, Inc.

RT8525 Datasheet(HTML) 9 Page - Richco, Inc.

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RT8525
DS8525-01 March 2012
www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Layout Considerations
PCB layout is very important for designing switching power
converter circuits. The following layout guides should be
strictly followed for best performance of the RT8525.
The power components L1, D1, CIN, COUT
, M1 and RS
must be placed as close as possible to reduce current
loop. The PCB trace between power components must
be as short and wide as possible.
Place components RFB1, RFB2, ROVP1 and ROVP2 close
to IC as possible. The trace should be kept away from
the power loops and shielded with a ground trace to
prevent any noise coupling.
The compensation circuit should be kept away from
the power loops and should be shielded with a ground
trace to prevent any noise coupling. Place the
compensation components to the COMP pin as close
as possible, no matter the compensation is RC, CC1 or
CC2.
Figure 5. PCB Layout Guide
Figure 4. Derating Curve of Maximum Power Dissipation
DRV
PGND
ISW
EN
OOVP
FB
FAULT
VDC
VIN
COMP
SS
FSW
AGND
PWMI
2
3
4
5
8
7
6
14
13
12
11
10
9
RC
CC1
CC2
PGND
VIN
CIN
VIN
RSLP
RS
M1
COUT
D1
L1
VOUT
AGND
ROVP2
RFB2
ROVP1
RFB1
PGND
The compensation circuit
should be kept away from
the power loops and should
be shielded with a ground
trace to prevent any noise
coupling.
Place the power components as close as possible. The traces
should be wide and short especially for the high-current loop.
The feedback voltage divider resistors must near the
feedback pin. The divider center trace must be
shorter and avoid the trace near any switching nodes.
VOUT
AGND is suggested
that connect to PGND
from the sense resistor
RS for better stability.
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
0
25
50
75
100
125
Ambient Temperature (°C)
Single-Layer PCB


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