Datasheet

LT3518
7
3518fe
BLOCK DIAGRAM
Figure 1. Buck Mode LED Driver
1V
CTRL
1.01V
1V
1V
10µA
V
IN
–
+
+
–
+
–
+
+
+
A1
X10
R
SENSE
ISP ISN
PV
IN
PWM
LED ARRAY
A3
A2
SS
–
+
–
+
A4
–
+
–
+
A5
–
+
A7
2V
3518 F01
A6
S
MAIN SWITCH
DRIVER
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER
PWM
COMPARATOR
R
Q1
MAIN
SWITCH
Q
TG
V
ISP
V
ISP
– 7V
MOSFET DRIVER
TGEN
C
FILT
SW SW
GND
C
IN
SHDN
FB
VC
SYNC
SS
RT
V
IN
FREQ
ADJUST
A8
V
REF
RAMP
GENERATOR
2.5MHz TO 250kHz
OSCILLATOR
+
100µA
V
IN
Q2