LT3743IUFD#PBF Linear Technology, LT3743IUFD#PBF Datasheet - Page 23

• 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: -

TYPICAL APPLICATIONS
Switched Cathode PWM Dimming (100:1) 0A to 20A
10A/DIV
10V/DIV
5V/DIV
PWM
I
LED
SW
2.2nF
10μs/DIV
R
499Ω
R
10k
HOT
NTC
82.5k
CONTROL
EN/UVLO
V
10nF
INPUT
CC_INT
PWM
6V to 30V, 20A LED Driver with Switched Cathode
3743 TA05b
EN/UVLO
PWM
CTRL_SEL
RT
SYNC
V
CTRL_L
CTRL_H
CTRL_T
SS
REF
VCL
LT3743
PWMGH
PWMGL
V
SENSE
SENSE
CBOOT
VCH
CC_INT
GND
SW
V
HG
LG
34k
FB
IN
+
–
4.7nF
150nF
22μF
1μF
D1: LUMINUS PT121
L1: MVR1261C-112ML
M1: RJK0365DPA
M2: RJK0328DPB
M3: SiR496DP
C1: PTPR330M9L (THREE IN PARALLEL)
M1
M2
1.1μH
L1
100
90
80
70
60
50
40
30
20
10
0
82μF
0
10Ω
2.5mΩ
33nF
PWM DIMMING DUTY CYCLE (%)
20
V
6V TO 30V
IN
0A to 20A Effi ciency
10Ω
20A MAXIMUM
40
OUTPUT
C1
330μF
3
60
60.4k
10k
3743 TA05
V
GREEN LED
IN
80
= 12V
M3
3743 TA05c
D1
100
LT3743
23
3743fb