LT3743IUFD#PBF Linear Technology, LT3743IUFD#PBF Datasheet - Page 11

• 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: -

BLOCK DIAGRAM
100nF
2.2nF
8.2nF
82.5k
34k
SYNC
402k
133k
8.2nF
V
IN
34k
16
15
13
14
17
18
2
3
6
7
8
4
EN/UVLO
V
SYNC
RT
CTRL_H
CTRL_L
SS
CTRL_T
VCL
VCH
CTRL_SEL
PWM
REF
1.5V
+
+
+
–
CTRL BUFFER
2V REFERENCE
OSCILLATOR
(QFN Package)
5.5μA
CURRENT
MIRROR
90k
–
+
Figure 1. Block Diagram
COMPARATOR
PWM
g
g
R
I
COMPARATOR
OUT
REGULATOR
m
m
O
OPEN-LED
VOLTAGE
AMP
= 475μA/V
= 3.5M
= 40μA
AMP
R
S
Q
2.5Ω
2.5Ω
–
+
–
+
SYNCRONOUS
+
–
CONTROLLER
REGUALTOR
INTERNAL
UVLO
AND
1V
1.3V
3k
LOW SIDE
HIGH SIDE
DRIVER
DRIVER
PWMGH
PWMGL
V
SENSE
SENSE
CBOOT
CC_INT
V
SW
HG
LG
FB
3743 F01
IN
+
–
28
27
25
23
24
26
11
12
10
22
19
40.2k
10k
10Ω
33nF
10Ω
R
5mΩ
2.2μH
0.1μF
S
330μF
×3
47μF
V
LT3743
IN
10μF
330μF
×3
11
10A LED
3743fb
OUTPUT