LT3518 LINER [Linear Technology], LT3518 Datasheet - Page 8

• Manufacturer Part Number: LT3518
• Description: Full-Featured LED Driver with 2.3A Switch Current
• Manufacturer: LINER [Linear Technology]

LT3518
BLOCK DIAGRAM
8
PV
IN
SHDN
CTRL
FB
V
SYNC
SS
R
C
T
1.01V
+
ISP
R
1V
SENSE
X10
1V
V
–
IN
ISN
–
+
+
+
–
10μA
CURRENT
SENSE
AMPLIFIER
A1
A2
+
–
1V
A5
+
+
–
A6
+
+
ADJUST
FREQ
SS
C
A3
IN
Figure 1. Buck Mode LED Driver
AMPLIFIER
Q2
ERROR
MOSFET DRIVER
2.5MHz TO 250kHz
V
TG
ISP
OSCILLATOR
GENERATOR
V
ISP
– 7V
RAMP
LED ARRAY
+
–
V
COMPARATOR
IN
A4
PWM
TGEN
R
S
Q
C
FILT
PWM
2V
–
+
MAIN SWITCH
DRIVER
A7
A8
100μA
+
–
SW SW
V
IN
Q1
MAIN
SWITCH
V
GND
REF
3518 F01
3518fb