LT3755IUD-1#PBF Linear Technology, LT3755IUD-1#PBF Datasheet - Page 19
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LT3755IUD-1#PBF
Manufacturer Part Number
LT3755IUD-1#PBF
Description
IC LED DRVR HP CONST CURR 16-QFN
Manufacturer
Linear Technology
Type
High Power, Constant Currentr
Datasheet
1.LT3755EUDPBF.pdf
(26 pages)
Specifications of LT3755IUD-1#PBF
Constant Current
Yes
Constant Voltage
Yes
Topology
Flyback, Low Side, PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
Number Of Outputs
1
Internal Driver
No
Type - Primary
Automotive
Type - Secondary
White LED
Frequency
100kHz ~ 1MHz
Voltage - Supply
4.5 V ~ 40 V
Voltage - Output
75V
Mounting Type
Surface Mount
Package / Case
16-WQFN Exposed Pad
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
1A
Internal Switch(s)
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Typical applicaTions
100
84
80
96
92
88
0.0
V
IN
= 12V
0.2
Efficiency vs Load
0.4
8V TO
LOAD (A)
40V
V
IN
0.6
C
4.7µF
IN
INTV
V
500mA/DIV
0.8
OUT
0V TO 5V
L1: COILTRONICS DR127-220
M1: VISHAY SILICONIX SI7850DP
D1: DIODES INC. PDS5100
M2: VISHAY SILICONIX SI2308DS
RT1: MURATA NCP18WM1045
10V/DIV
37551 TA02c
2A/DIV
CC
100k
R1
1M
R2
187k
= 50V
PWM
C
0.01µF
I
LED
SS
I
L1
1.0
Waveforms for 50W LED Driver with
50W White LED Headlamp Driver
V
16.9k
IN
R
28.7k
375kHz
100k
NTC
RT1
T
= 12V
PWM Disconnect NFET
SHDN/UVLO
V
CTRL
OPENLED
PWM
SS
RT
V
REF
C
R
10k
C
C
0.001µF
C
LT3755-2
50µs/DIV
V
GND
IN
PWMOUT
SEE SUGGESTED LAYOUT, FIGURE 5
INTV
SENSE
GATE
ISN
22µH
ISP
FB
LT3755/LT3755-1/LT3755-2
L1
CC
C
4.7µF
VCC
37551 TA02b
120
100
M1
80
60
40
20
R
0.015
0
SENSE
25
V
D1
(ISP-ISN)
R
0.1
LED
for NTC Resistor Divider
45
1A
Threshold vs Temperature
TEMPERATURE (°C)
65
R3
1M
R4
23.7k
M2
37551 TA02a
50W
LED
STRING
85
C
4.7µF
OUT
105
37551 TA02d
125
37551fd