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LT1932 Datasheet(PDF) 9 Page - Linear Technology

Part # LT1932
Description  Constant-Current DC/DC LED Driver in ThinSOT
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1932 Datasheet(HTML) 9 Page - Linear Technology

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9
LT1932
APPLICATIO S I FOR ATIO
TYPICAL APPLICATIO S
Figure 7. Recommended Component Placement
C1
L1
D1
GND
C2
RSET
1932 F07
1
2
3
6
5
4
DIMMING
CONTROL
SHDN
VIN
Board Layout Considerations
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To maximize efficiency, switch rise and fall times are made
as short as possible. To prevent radiation and high fre-
quency resonance problems, proper layout of the high
frequency switching path is essential. Minimize the length
and area of all traces connected to the SW pin and always
use a ground plane under the switching regulator to
minimize interplane coupling. The signal path including
the switch, output diode D1 and output capacitor C2,
contains nanosecond rise and fall times and should be
kept as short as possible. In addition, the ground connec-
tion for the RSET resistor should be tied directly to the GND
pin and not be shared with any other component, ensuring
a clean, noise-free connection. Recommended compo-
nent placement is shown in Figure 7.
5V Driver for 16 White LEDs
VIN
SW
D1
30mA
1932 TA14a
L1
10
µH
VIN
5V
LT1932
SHDN
C1: TAIYO YUDEN JMK212BJ475
(408) 573-4150
C2: TAIYO YUDEN GMK325BJ225
(408) 573-4150
D1: ZETEX ZHCS400
(631) 543-7100
L1: MURATA LQH3C100M24
(814) 237-1431
61
4
RSET
750
Ω
5V DC
DIMMING
CONTROL
C1
4.7
µF
C2
2.2
µF
51.1k
2
3
100
Ω
5
LED
RSET
GND
100
Ω
Efficiency
LED CURRENT (mA)
0
50
55
60
65
70
75
80
10
20
30
515
25
1932 TA14b



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