LT3517I View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT3517I' PDF : 20 Pages View PDF
LT3517
TYPICAL APPLICATIONS
Low Side Current Sensing Load Dump Protected Buck-Boost Mode LED Driver
VIN
8V TO 16V
PWM
C1
2.2µF
L1
6.8µH
D1
SHDN VIN
SW
FB
PWM
TGEN
VREF
CTRL
SYNC
LT3517
VC RT SS
ISP
ISN
TG
GND
R3
10k
C4
33nF
RT
6.04k
2MHz
C3
0.1µF
R1
3.92M
R2
124k
RSENSE
330mΩ
M1
300mA
C5
0.22µF
C2
4.7µF
3517 TA05a
D1: DIODES DFLS160
L1: TOKO B992AS-6R8N
C1: KEMET C0806C225K4RAC
C2: KEMET C1206C475K3RAC
C3: MURATA GRM21BR71H104KA01B
C4: MURATA GRM219R71H333KAQ01B
C5: MURATA GRM21BR71H224KA01B
M1: ZETEX ZXMP6A13FTA
LEDs: LUXEON I (WHITE)
5000:1 PWM Dimming at 100Hz
PWM
5V/DIV
ILED
200mA/DIV
IL
1A/DIV
VIN = 12V
fOSC = 2MHz
ILED = 300mA
500ns/DIV
3517 TA05b
Load Dump Response
VISP
15V TO 40V
VISP REF GND
VIN REF GND
VIN 15V TO 40V
5ms/DIV
VIN Raises From 15V to 40V in 5ms.
VISP 10V/DIV
VIN 10V/DIV
ILED 200mA/DIV
IL 1A/DIV
3517 TA05d
Efficiency
90
VIN = 12V
80 CTRL = VREF
70
60
50
40
30
20
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3517 TA05c
14
For more information www.linear.com/LT3517
3517fg
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