lt3517 Linear Technology Corporation, lt3517 Datasheet - Page 15

• Manufacturer Part Number: lt3517
• Description: Full-featured Led Driver With 1.5a Switch Current
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
V
V
ISP
IN
200mA/DIV
REF GND
REF GND
5V/DIV
1A/DIV
PWM
I
LED
I
L
V
V
f
I
8V TO 16V
OSC
LED
15V TO 40V
IN
IN
Raises From 15V to 40V in 5ms.
= 12V
= 300mA
= 2MHz
5000:1 PWM Dimming at 100Hz
V
V
IN
ISP
Load Dump Response
C1
2.2μF
V
PWM
500ns/DIV
Low Side Current Sensing Load Dump Protected Buck-Boost Mode LED Driver
IN
5ms/DIV
15V TO 40V
33nF
C4
10k
R3
PWM
TGEN
V
CTRL
SYNC
V
SHDN
REF
C
2MHz
6.04k
R
T
3517 TA05b
3517 TA05d
R
V
LT3517
IN
T
SS
6.8μH
L1
V
V
I
I
LED
L
C3
0.1μF
ISP
IN
1A/DIV
10V/DIV
SW
200mA/DIV
10V/DIV
GND
ISN
ISP
TG
FB
D1
R1
3.92M
R2
124k
M1
R
330mΩ
300mA
SENSE
90
80
70
60
50
40
30
20
0
C2
4.7μF
V
CTRL = V
IN
C5
0.22μF
= 12V
3517 TA05a
20
REF
PWM DUTY CYCLE (%)
Effi ciency
40
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)
60
80
3517 TA05c
100
LT3517
15
3517f