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PDF LT3595A Data sheet ( Hoja de datos )
| Número de pieza | LT3595A | |
| Descripción | 16 Channel Buck Mode LED Driver | |
| Fabricantes | Linear Dimensions Semiconductor | |
| Logotipo |  |
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FEATURES
n 4.5V to 45V Input Supply Range
n Up to 50mA LED Current per Channel
n 100mA, 45V Internal Switches
n Improvements vs LT3595
Pinout Allows 1-Sided PCB Layout
Higher Maximum Switch Duty Cycle
LED Current Accuracy (7% vs 8%)
±4% LED Current Matching
n 16 Independent LED Channels
n 5000:1 True Color PWMTM Dimming Range
n LEDs Disconnected in Shutdown
n Internal Schottky Diodes
n 2MHz Switching Frequency
n RSET Pin Sets Master LED Current
n Typical Efficiency: 92%
n Open LED Detection and Thermal Protection
n 56-Pin 5mm × 9mm × 0.75mm QFN Package
APPLICATIONS
n LED Video Billboards
n LCD Televisions
n Stadium and Advertising Displays
LT3595A
16 Channel
Buck Mode LED Driver
DESCRIPTION
The LT®3595A is a high performance LED Driver designed
to drive sixteen independent channels of up to 10 LEDs
at currents up to 50mA. Series connection of the LEDs
provides identical LED currents resulting in uniform bright-
ness. Power switches, Schottky diodes, and compensation
components are all internal, providing a small converter
footprint and lower component cost. The high 2MHz
switching frequency permits the use of tiny, low profile
inductors and capacitors. A fixed frequency, current mode
architecture results in stable operation over a wide range
of supply and output voltage.
A single external resistor sets the LED current for all sixteen
channels, and dimming is then controlled for each chan-
nel by pulse width modulating the individual PWM pins.
LED current accuracy is 7%, channel-to-channel current
matching is ±4% and the PWM dimming range is 5000:1.
The part is available in a 5mm × 9mm × 0.75mm 56-pin
QFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color
PWM is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPLICATION
VIN
15V TO
45V
16-Channel LED Driver (Three LEDs per Channel), 20mA Current
0.47μF
10μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
VCC
100k
LED
BRIGHTNESS
CONTROL
VCC
3V TO
5.5V
L1 SW1 L2 SW2
SW3 L3 SW4 L4
L5 SW5 L6 SW6
SW7 L7
OPENLED
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
LT3595A
PWM7
PWM8
SHDN
VCC
L16 SW16 L15 SW15 VIN SW14 L14 SW13 L13
L12 SW12 L11 SW11 VIN SW10 L10
SW8 L8
PWM9
PWM10
PWM11
PWM12
PWM13
PWM14
PWM15
PWM16
GND
RSET
SW9 L9
10μF
LED
BRIGHT-
NESS
CONTROL
5000:1 PWM
Dimming at 100Hz
VPWM
5V/DIV
ISW
20mA/DIV
ILED
10mA/DIV
400ns/DIV
VIN = 15V
T = 10ms
3 LEDS AT 20mA tON = 2μs
3595A TA01b
0.47μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
3595A TA01
3595af
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LT3595A
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Current Limit vs Temperature
150
140
130
120
110
100
90
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3595A G09
Switching Frequency
vs Temperature
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3595A G10
Schottky Leakage Current
vs Temperature
1.4
1.2
1.0
VIN = 45V
0.8
0.6
VIN = 24V
0.4
VIN = 4.5V
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3595A G11
Switch Saturation Voltage
(VCESAT)
700
600
500
T = –40°C
400
300 T = 25°C
200 T = 125°C
100
0
0 20 40 60 80 100
SWITCH CURRENT (mA)
3595A G12
Schottky Forward Voltage Drop
100
80
60
T = 125°C
40
20
0
0
T = 25°C
T = –40°C
0.2 0.4 0.6 0.8
1
SCHOTTKY FORWARD DROP (V)
3595A G13
Transient Response
VSHDN
5V/DIV
VSW
50V/DIV
ISW
50mA/DIV
ILED
20mA/DIV
100μs/DIV
VIN = 45V
10 LEDS AT 20mA
3595A G14
OPENLED Waveforms
ILED
CH 1
20mA/DIV
OPENLED
5V/DIV
VSW
CH 1
50V/DIV
ILED
CH 2
20mA/DIV
20μs/DIV
VIN = 45V
10 LEDS AT 20mA
3595A G15
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LT3595A
APPLICATIONS INFORMATION
Dimming Control
The sixteen PWM1-16 inputs control the dimming func-
tion. Each channel is modulated by its corresponding
PWM1-16 input. On a rising edge of any PWM1-16, the
IC’s internal support circuitry is enabled and the specific
channel turns on. LED current flows in the channel until
the falling edge of the PWM1-16 input. In this way, the
average LED current is modulated. The minimum on time
of a channel is 2μs and the maximum period is 10ms (at
100Hz). Therefore, the maximum dimming ratio is 5000:1.
Since the maximum RSET produces 10mA, the minimum
modulated LED current is 2μA.
When multiple channels are modulated, the rising edges
of PWM1-16 must be synchronized. The falling edges may
be asynchronous. A sample timing diagram is shown in
Figure 3.
SYNCHRONIZED RISING EDGES
PWM1-4
tON(MIN) = 2μs
PWM5-8
tMAX = 10ms
PWM9-16
ILED1-4
ILED5-8
ILED9-16
Figure 3. Timing Diagram for Multi-Channel Modulation
3595A F03
3595af
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT3595A.PDF ] | |
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