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TC18C46 Datasheet(PDF) 6 Page - TelCom Semiconductor, Inc

Part # TC18C46
Description  CMOS CURRENT MODE PWM CONTROLLER
PDF  10 Pages
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Manufacturer  TELCOM [TelCom Semiconductor, Inc]
Direct Link  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC18C46 Datasheet(HTML) 6 Page - TelCom Semiconductor, Inc

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4-106
TELCOM SEMICONDUCTOR, INC.
Figure 1. R1 and R2 Set Maximum Peak Output Current
Figure 2. Resistive Sensing
4
3
3 CURRENT-
SENSE
AMPLIFIER
C
R*
(A) Ground Reference
*OPTIONAL RC FILTER
I
I
4
3
TCx8C46
VOUT
RS
(B) Above-Ground Resistive Sensing
TCx8C46
RS
3 CURRENT-
SENSE AMPLIFIER
×
×
+
–
+
–
TC18C46
TC28C46
TC38C46
SWITCH
CURRENT
3 CURRENT-SENSE
×
0.65V
–
+
4
3
7
5
6
VDD
100
µA
V1
ERROR
AMPLIFIER
POSITIVE
FEEDBACK
Q2
350mV
Q3
SHUTDOWN
COMPARATOR
350mV
6k
Ω
Q4
FROM
UNDERVOLTAGE
LOCKOUT
10
PWM LATCH
S
S
R
Q
LOCK-UP
AMPLIFIER
I L
3.5k
Ω
Q1
PWM COMPARATOR
"A" = 1
OUTPUT
OFF (LOW)
VREF
5.1V
2
V1
R2
16
LIMIT
BUFFER
AMPLIFIER
RS
R1
AMPLIFIER
1
+
–
+
–
+
–
+
–
–
+
+
–
CMOS CURRENT MODE
PWM CONTROLLERS
TC18C46
TC28C46
TC38C46



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