LT3955_15 Datasheet, PDF (10/30 Pages) Linear Technology – 60VIN LED Converter with Internal PWM Generator

LT3955
Block Diagram
V_REF
–
+^A7
2V
180µA
PWM
F1(I_DIM/SS)
F2(I_DIM/SS)
–
FB
+
1.3V
OVFB
COMPARATOR
PWMOUT
1.25V
– ^LDO
+^A8
0.8V + F3(I_DIM/SS) –
+
–
0.8V +
S
RQ
PWMINT
V_IN
7.85V
INTV_CC
SW
100mV
CTRL
CTRL
BUFFER
1V
CLAMP
×1/4
A3
ISP
ISN
FB
FAULT
1.5mA
10µA
CC EAMP
– ^A1
+^gm
10µA AT
A₁₊ = A_1–
1.25V
CV EAMP
+ ^A5
–^gm
10µA AT
FB = 1.25V
V_C
EN/UVLO – A6
1.22V ⁺
2.2µA
SHDN
FAULT
BANDGAP ISP > ISN + 0.6V
REFERENCE
T > 165°C
FAULT
LOGIC
+
–^A2
RQ
M1
S
DRIVER
48mV
CURRENT MODE
COMPARATOR
RAMP
GENERATOR
A4
I_SENSE
I_DIM/SS
DETECT
100kHz TO 1MHz
OSCILLATOR
1V +
+– _FREQ
PROG
12µA
DIM/SS
PWMINT
25mV
ISN
+
ISP –
RT SYNC
–
1.2V
FB ⁺
R_SENSE
PGND
GNDK
GND
VMODE
OPENLED
LOGIC
3955 BD
10
For more information www.linear.com/LT3955
3955fb