Linear Technology DC1160A - LT3518EUF Demo Board DC1160A DC1160A データシート
製品コード
DC1160A
LT3518
1
3518fe
FEATURES
APPLICATIONS
DESCRIPTION
Full-Featured LED Driver
with 2.3A Switch Current
The LT
®
3518 is a current mode DC/DC converter with an
internal 2.3A, 45V switch specifi cally designed to drive
LEDs. The LT3518 operates as a LED driver in boost, buck
mode and buck-boost mode. It combines a traditional
voltage loop and a unique current loop to operate as a
constant-current source or constant-voltage source. Pro-
grammable switching frequency allows optimization of the
external components for effi ciency or component size. The
switching frequency of the LT3518 can be synchronized
to an external clock signal. The LED current is externally
programmable with a 100mV sense resistor. The external
PWM input provides 3000:1 LED dimming. The CTRL pin
provides further 10:1 dimming ratio.
LEDs. The LT3518 operates as a LED driver in boost, buck
mode and buck-boost mode. It combines a traditional
voltage loop and a unique current loop to operate as a
constant-current source or constant-voltage source. Pro-
grammable switching frequency allows optimization of the
external components for effi ciency or component size. The
switching frequency of the LT3518 can be synchronized
to an external clock signal. The LED current is externally
programmable with a 100mV sense resistor. The external
PWM input provides 3000:1 LED dimming. The CTRL pin
provides further 10:1 dimming ratio.
The LT3518 is available in the tiny footprint 16-lead QFN
(4mm × 4mm) and the 16-pin TSSOP package. The LT3518
provides a complete solution for both constant-voltage
and constant-current applications.
(4mm × 4mm) and the 16-pin TSSOP package. The LT3518
provides a complete solution for both constant-voltage
and constant-current applications.
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3000:1 True Color PWM™ Dimming Ratio
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2.3A, 45V Internal Switch
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100mV High Side Current Sense
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Open LED Protection
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Adjustable Frequency: 250kHz to 2.5MHz
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Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V
Transient Protection to 40V
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Operates in Boost, Buck Mode and Buck-Boost Mode
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Gate Driver for PMOS LED Disconnect
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Constant-Current and Constant-Voltage Regulation
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CTRL Pin Provides 10:1 Analog Dimming
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Low Shutdown Current: <1μA
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Available in (4mm × 4mm) 16-Lead QFN and 16-Pin
TSSOP Packages
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Display Backlighting
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Automotive and Avionic Lighting
n
Illumination
n
Scanners
1.5A Buck Mode LED Driver
Effi ciency
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color
PWM is a trademark of Linear Technology Corporation. Patent Pending. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 7199560,
7321203, 7746300.
PWM is a trademark of Linear Technology Corporation. Patent Pending. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 7199560,
7321203, 7746300.
1.5A
10μF
15μH
2.2μF
0.1μF
68mΩ
M1
2.2μF
V
REF
ISP
TGEN
GND
V
REF
VC
16.9k
1MHz
1MHz
3518 TA01a
0.1μF
V
IN
SHDN
CTRL
PWM
SYNC
FB
SS
RT
SW
PV
IN
24V
V
IN
3.3V
ISN
LT3518
TG
PWM
PWM DUTY CYCLE (%)
0
40
EFFICIENCY (%)
50
60
70
80
90
100
20
40
60
80
3518 TA01b
100
CTRL = V
REF
TYPICAL APPLICATION