LT3743IUFD#PBF Linear Technology, LT3743IUFD#PBF Datasheet - Page 8

• Manufacturer Part Number: LT3743IUFD#PBF
• Description: IC LED DRVR HP CONST CURR 28QFN
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3743IUFD#PBF

• Topology: High Side, Low Side, PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: General Purpose
• Type - Secondary: RGB
• Frequency: 200kHz ~ 1MHz
• Voltage - Supply: 6 V ~ 36 V
• Mounting Type: Surface Mount
• Package / Case: 28-QFN
• Operating Temperature: -40°C ~ 125°C
• Internal Switch(s): Yes
• Efficiency: 92%
• Led Driver Application: Lighting
• No. Of Outputs: 1
• Output Current: 20A
• Output Voltage: 40V
• Input Voltage: 6V To 36V
• Dimming Control Type: PWM
• Operating Temperature Range: -40°C To +125°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Current - Output / Channel: -

LT3743
TYPICAL PERFORMANCE CHARACTERISTICS
8
CTRL_SEL
11.1A/DIV
2V/DIV
5A/DIV
10V/DIV
5V/DIV
V
120
100
OUT
80
60
40
20
I
0
SW
LED
I
L
0
Overcurrent Threshold
Voltage Regulation with 10A
Regulated Inductor Current
LED Current Waveforms
(3000:1) 2A to 20A
0.75
CTRL_H (V)
100μs/DIV
20μs/DIV
1.5
2.25
3743 G28
3743 G34
3743 G31
3.0
200mA/DIV
CTRL_SEL
CTRL_SEL
10A/DIV
10V/DIV
10A/DIV
20V/DIV
2V/DIV
5V/DIV
5A/DIV
5V/DIV
5V/DIV
PWM
V
I
I
OUT
SW
LED
SW
LED
I
I
L
L
LED Current Waveforms
(90% PWM) 0.5A to 5A
LED Current Waveforms
(3000:1) 0A to 2A to 20A
Common Mode Lockout (V
40μs/DIV
20μs/DIV
1ms/DIV
IN
= 7V)
3743 G32
3743 G35
3743 G29
200mA/DIV
CTRL_SEL
CTRL_SEL
0.2V/DIV
10A/DIV
CTRL_L
2V/DIV
5V/DIV
5V/DIV
8A/DIV
5V/DIV
5A/DIV
PWM
V
I
I
OUT
LED
LED
I
I
L
L
LED Current Waveforms
(2000:1) 3A to 10A
LED Current Waveforms (3000:1)
Analog Dimming on CTRL_L
C
Overvoltage Lockout Operation
With Open-Load Condition
OUT(LOW)
= 22μF , C
40ms/DIV
40μs/DIV
5μs/DIV
OUT(HIGH)
= 1mF
3743fb
3743 G33
3743 G30
3743 G36