LT3599
BLOCK DIAGRAM
SHDN /UVLO
V IN
RT
SYNC
SW
1.4V
+
1.227 V REF
SOFT-START LOGIC
SLOPE
OSCILLATOR
S
Q
Q1
V C
SS
PWM
PWM DIMMING
A2
R
A3
+
– –
V OUT
PMOS
LOGIC
+
V REF
V O_SW
V REF
OVP g m
FB
R2
R1
+
0.7V
CTRL
LED g m
SHORTLED
1V
T SET
V PTAT
I SET
A1
LED DRIVE
CIRCUITRY
OPENLED , SHORTLED
DETECTION
LED4 DISABLE
OPENLED
LED1
LED2
LED3
LED4
DISABLE4
GND
3599 F01
Figure 1. Block Diagram
3599fe
8
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