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LTC4002 датащи(PDF) 8 Page - Linear Technology

номер детали LTC4002
подробное описание детали  PWM LED Driver and Boost, Flyback and SEPIC Controller
PDF  24 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC4002 датащи(HTML) 8 Page - Linear Technology

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8
LTC3783
3783f
PI FU CTIO S
ITH(Pin15):ErrorAmplifierOutput/CompensationPin.The
current comparator input threshold increases with this
control voltage, which is the output of the gm 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
VIN 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
OSC
V-TO-I
V-TO-I
LDO
BIAS AND
START-UP
9
+
–
–
+
–
LOGIC
VREF
BIAS
SLOPE
COMP
TEMP
SENSOR
(165
°C)
OT
SS_RESET
Q
0.615V
FREQ
GATE
12
SENSE
8
PWMOUT
11
VIN
16
RUN
3738 BD
UV
ITRIP
17
GND
4
VREF
S
R
OV
CLK
SLEEP
EN
OV/FB
VREF
1 S
0
5
SYNC
6
ILIM
3
FBP
FBN
2
1
OV/FB
14
SS
13
+
–
50
µA
0.2V
+
–
+
–
IMAX
0.15V
+
–
VREF
+
–
1.9V
IVMODE
VREF
+
–
ITH
15
PWMIN
7
2.23V
VREF
+
–
INTVCC
10
A
EA



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