LT3496 반도체 회로 부품 판매점
Triple Output LED Driver
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 Linear Technology |
FEATURES
n True Color PWM™ Dimming Delivers Up to 3000:1
Dimming Ratio
n Built-In Gate Driver for PMOS LED Disconnect
n Three Independent Driver Channels with 750mA,
45V Internal Switches
n Operates in Buck, Boost, Buck-Boost Modes
n CTRL Pin Accurately Sets LED Current Sense
Threshold Over a Range of 10mV to 100mV
n Adjustable Frequency: 330kHz to 2.1MHz
n Open LED Protection
n Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V
n Surface Mount Components
n 28-Lead (4mm × 5mm) QFN and TSSOP Packages
APPLICATIONS
n RGB Lighting
n Billboards and Large Displays
n Automotive and Avionic Lighting
n Constant-Current Sources
LT3496
Triple Output LED Driver
DESCRIPTION
The LT®3496 is a triple output DC/DC converter designed
to operate as a constant-current source and is ideal for
driving LEDs. The LT3496 works in buck, boost or buck-
boost mode. The LT3496 uses a fixed frequency, current
mode architecture resulting in stable operation over a
wide range of supply and output voltages. A frequency
adjust pin allows the user to program switching frequency
between 330kHz and 2.1MHz to optimize efficiency and
external component size.
The LT3496 supports 3000:1 dimming control on each
channel. Each of the three regulators is independently
operated by that channel’s PWM signal. The PWM feature
allows precise adjustment of the color mixing or dimming
ratio of the LED source. Each of the three channels has
a built-in gate driver to drive an external LED-disconnect
P-channel MOSFET, allowing high dimming range. The
output current range of each channel of the LT3496 is
programmed with an external sense resistor.
The CTRL pin is used to adjust the LED current either for
analog dimming or overtemperature protection.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
7199560, 7321203, and others pending.
wwwT.DYataPShIeCetA4UL.comAPPLICATION
High Dimming Ratio Triple Output LED Power Supply
PVIN
42V CAP1
200mΩ
LED1
CAP2
200mΩ
LED2
TG1 TG2
CAP3
200mΩ
LED3
TG3
1μF
s3
7 LEDs
0.5A
0.47μF 0.47μF
0.5A
0.5A
0.47μF
18μH
18μH
18μH
VIN
3V TO 24V
1μF
PWM1-3
SHDN
SW1
CAP1-3
LED1-3
VIN
PWM1-3
SHDN
SW2
LT3496
GND
SW3 TG1-3
VC1-3
VREF
CTRL1-3
FADJ
OVP1-3
22k
470pF
3496 TA01a
3000:1 PWM Dimming at 120Hz
PWM
5V/DIV
IL
0.5A/DIV
ILED
0.5A/DIV
0.5μs/DIV
3496 TA01b
3496fe
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LT3496
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN (Note 4)...............................................................40V
SW1-SW3, LED1-LED3, CAP1-CAP3 ........................45V
TG1-TG3 ............................................ CAP – 10V to CAP
PWM1-PWM3 ...........................................................20V
VREF, CTRL1-CTRL3, FADJ, VC1-VC3, OVP1-OVP3 .2.5V
SHDN (Note 4) ...........................................................VIN
Operating Junction Temperature Range
(Note 2).................................................. –40°C to 125°C
Max Junction Temperature.................................... 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
SHDN 1
PWM3 2
PWM2 3
PWM1 4
VREF 5
CTRL3 6
CTRL2 7
CTRL1 8
FADJ 9
VC3 10
VC2 11
VC1 12
OVP3 13
OVP2 14
TOP VIEW
29
28 VIN
27 TG3
26 LED3
25 CAP3
24 SW3
23 SW2
22 CAP2
21 LED2
20 TG2
19 SW1
18 CAP1
17 LED1
16 TG1
15 OVP1
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 25°C/W, θJC = 10°C/W
www.DataSheet4UEX.cPoOmSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
28 27 26 25 24 23
PWM1 1
22 CAP3
VREF 2
CTRL3 3
21 SW3
20 SW2
CTRL2 4
CTRL1 5
19 CAP2
29
18 LED2
FADJ 6
17 TG2
VC3 7
16 SW1
VC2 8
15 CAP1
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 2.7°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3496EFE#PBF
LT3496EFE#TRPBF
3496FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3496IFE#PBF
LT3496IFE#TRPBF
3496FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3496EUFD#PBF
LT3496EUFD#TRPBF
3496
28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3496IUFD#PBF
LT3496IUFD#TRPBF
3496
28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
*For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3496fe
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제조업체: Linear Technology
( linear )
LT3496 led
데이터시트 다운로드 :
[ LT3496.PDF ]
[ LT3496 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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