Datasheet

LT3761
10
3761f
block Diagram
+
–
+
–
+
–
–
+
–
+
×1/4
A6
+
+
–
FREQ
PROG
1V
1V
CLAMP
100mV
CTRL
V
REF
EN/UVLO
25mV
185µA
2.3µA
CTRL
BUFFER
CURRENT MODE
COMPARATOR
DRIVER
PWM LATCH
I
SENSE
A4
+
–
105mV
g
m
A5
OVFB
COMPARATOR
1.25V
FB
PWMOUT
PWM
PWMINT
1.25V
V
IN
INTV
CC
V
C
+
–
+
–
A2
R Q
S
R Q
S
RAMP
GENERATOR
I
DIM_SS
DETECT
100kHz TO 1MHz
OSCILLATOR
+
–
+
–
A8
7.85V
LDO
GATE
SENSE
3761 BD
OPENLED
GND
1.2V
FB
ISN
ISP
+
–
1.22V
+
–
2.02V
1.3V
FB
0.8V + F3(I
DIM/SS
)
0.8V
RT
DIM/SS
SHDN
CV EAMP
CC EAMP
A7
10µA AT
FB = 1.25V
12µA
FAULT
LOGIC
OPENLED
LOGIC
PWMINT
T > 165°C
ISP > ISN + 0.6V
FAULT
10µA
BANDGAP
REFERENCE
–
+
g
m
A1
A3
ISN
ISP
F1(I
DIM/SS
)
F2(I
DIM/SS
)
10µA AT
A1
+
= A1
–
R
LED
R
SNS
I
SWITCH
I
LED
+
–
+
–
1.5mA
FAULT
+
–