LTC3783 Datasheet, PDF (8/24 Pages) Linear Technology – PWM LED Driver and Boost, Flyback and SEPIC Controller

LTC3783
PI FU CTIO S
I_TH (Pin 15): Error Amplifier Output/Compensation Pin. The
current comparator input threshold increases with this
control voltage, which is the output of the g_m type error
amplifier. Nominal voltage range for this pin is 0V to 1.40V.
RUN (Pin 16): The RUN pin provides the user with an
accurate means for sensing the input voltage and pro-
gramming the start-up threshold for the converter. The
falling RUN pin threshold is nominally 1.248V and the
comparator has 100mV hysteresis for noise immunity.
When the RUN pin is grounded, the IC is shut down and the
V_IN supply current is kept to a low value (20µA typ).
Exposed Pad (Pin 17): Ground Pin. Solder to PCB ground
for electrical contact and rated thermal performance.
BLOCK DIAGRA
SLOPE
COMP
BIAS
V_REF
FREQ
5
SYNC
6
1.9V –
+
I_LIM
3
FBP
2
FBN
A
1
OV/FB
14
0.615V
V-TO-I
CLK
OSC
S
Q
R
SS_RESET
LOGIC
IVMODE
EA
OV/FB +
V_REF –
–
V_REF +–
1S
+
0
–
TEMP _OT
OV
SENSOR
(165°C)
0.2V +
–
SLEEP
50µA
ITRIP
SS
13
IMAX
I_TH
15
PWMIN
7
INTV_CC
10
V-TO-I
EN
LDO
V_REF
2.23V +
UV
–
BIAS AND
START-UP
V_REF
4
GND
17
GATE
9
SENSE
12
0.15V
PWMOUT
8
RUN
16
V_REF
V_IN
11
3738 BD
3783f
8