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PDF LT3003 Data sheet ( Hoja de datos )
| Número de pieza | LT3003 | |
| Descripción | 3-Channel LED Ballaster | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 3% LED Current Matching
■ Up to 350mA Continuous Current per LED String
■ Up to 3000:1 True Color PWMTM Dimming Range
■ PWM Input Disconnects LED Strings
■ Can Operate in Buck, Boost and Buck-Boost Modes
■ Wide Input Range: 3V to 40V
■ Overtemperature Outputs
■ Works with LT1618, LT3477, LT3474, LT3475,
LT3476, LTC®3783
■ Thermally Enhanced 10-Pin MSOP Package
APPLICATIONS
■ High Power LED Ballaster
■ Automotive Lighting
■ Video Cameras
■ TFT LCD Backlighting
LT3003
3-Channel LED
Ballaster with PWM
DESCRIPTION
The LT®3003 drives three separate strings of LEDs up
to 350mA/channel with 3% accurate current matching,
resulting in uniform LED brightness and intensity. This
approach is superior to conventional methods of running
three separate channels with external ballast resistors
requiring expensive factory calibration.
The LT3003 operates in boost, buck and buck-boost mode.
A True Color PWM Dimming ratio of up to 3000:1 is achiev-
able using a logic-level signal at the PWM pin for all modes
without the need for external level-shifting circuitry. For
applications with input supply above and below the output
voltage of the LED strings, the LT3003 allows the LEDs to
be returned to the input supply (buck-boost mode) instead
of being limited to only SEPIC solutions.
The LT3003 is ideal for high power LED driver applications
such as TFT LCD backlighting and heads-up displays. Ad-
ditional overtemperature outputs allow appropriate system
management for increased reliability.
The LT3003 is available in a small 10-pin MSE package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technolology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Buck Mode LT3003 with the LT3476
PVIN
32V
1µF
0.1Ω
8 × 3 = 24 LEDs
350mA PER STRING
VIN
3V TO 16V
10µF
PWM
DIMMING
LED1
VMAX
LED2
LED3
VIN
SHDN LT3003
PWM
GND OT1 OT2
VEE
1µF
CAP LED
PWM
VIN SIMPLIFIED LT3476
GND
VC
SW
0.33µF
1nF 10µH
3003 TA01a
Efficiency
90
85
80
75
70
65
PVIN = 32V
NUMBER OF LEDS = 8 × 3 = 24
60
0 200 400 600 800
1000
TOTAL LED CURRENT (mA)
1200
3003 TA01b
3003fa
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PIN FUNCTIONS
VEE (Pin 10): Lower Rail.
• Boost: Connect to System Ground
• Buck Mode: Connect to Inductor
• Buck-Boost Mode: Connect to Input Supply
LT3003
Exposed Pad (Pin 11): GND. The ground for the IC should
be soldered to a continuous copper ground plane under
the LT3003 die. Soldering the Exposed Pad to the copper
ground plane under the device will reduce thermal resis-
tance and increase the power capability of the LT3003.
BLOCK DIAGRAM
1
LED1
4
VMAX
B1 +
–
2
LED2
VIN
B2
3
LED3
+ B3
–
PWM
6
+
0.5V –
B1 B2 B3
PWM
LOGIC
VEE
BIAS
BG
EXPOSED PAD
11
Figure 1. Block Diagram
+
– 3V
+
– 0.7V
THERMAL
SHUTDOWN
BG 125°C
150°C
VEE
10
VIN
5
SHDN
9
OT1
7
OT2
8
3003 F01
3003fa
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LT3003
TYPICAL APPLICATIONS
330mA Boost LT3003 with the LT3477
VIN
8V TO 16V
L1
4.7µH
D1
C1
1µF 13 14
25V ISP1 ISN1
1
10 VIN
9 IADJ1
IADJ2
16 17
SW SW 6
FBN
18
NC
19
NC
20
NC
3
SHDN LT3477
11
ISP2
PWM
D2
1N4148W
7
FBP
8
5 VREF
VC
12
ISN2
R3
2 6.81k
RT
GND GND SS
Q1
2N7002
C2
22nF
15 21 4
C3
0.033µF
C1, C3: TAIYO YUDEN TMK212BJ105MG-BR
C4: MURATA GRM32ER71H475KA88L
D1: DIODES INC. DFLS140
L1: SUMIDA CDRH5D16-4R7
R5
1.15M
1%
R6
45.3k
1%
VOUT
C4
4.7µF
50V
R4
0.3Ω
1%
ILED
110mA PER STRING
6 to 8
LEDs PER STRING
3
LED1
6
PWM
2
LED2
1
LED3
4
VMAX
VOUT VIN
7
OT1
LT3003
5
VIN
8
OT2
GND
11
9
SHDN
VEE
10
3003 TA03a
4V
C3
1µF
25V
PWM Dimming
1000
ILED = 110mA PER STRING
NUMBER OF LEDS = 8 × 3 = 24
100
10
1
0.1
1
10 100 1000
PWM DIMMING RATIO
10000
3003 TA03b
Efficiency
100
95
ILED = 110mA PER STRING
NUMBER OF LEDS = 8 × 3 = 24
90
85
80
75
70
65
60
55
50
8 9 10 11 12 13 14 15 16
VIN (V)
3003 TA03b
3003fa
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT3003.PDF ] | |
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