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TC170 Datasheet(PDF) 5 Page - TelCom Semiconductor, Inc

Part # TC170
Description  CMOS CURRENT MODE PWM CONTROLLER
PDF  8 Pages
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Manufacturer  TELCOM [TelCom Semiconductor, Inc]
Direct Link  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC170 Datasheet(HTML) 5 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
CMOS CURRENT MODE
PWM CONTROLLER
TC170
4
3
3.15 CURRENT-
SENSE
AMPLIFIER
C
R*
(A) Ground Reference
*OPTIONAL RC FILTER
I
I
4
3
TC170
VOUT
RS
(B) Above-Ground Resistive Sensing
TC170
RS
3.15 CURRENT-
SENSE AMPLIFIER
×
×
+
–
+
–
Figure 1.
R1 and R2 Set Maximum Peak Output Current
Figure 2.
Resistive Sensing
TC170
SWITCH
CURRENT
3.15 CURRENT-SENSE
×
0.75V
–
+
4
3
7
5
6
VDD
100 A
µ
V1
ERROR
AMPLIFIER
POSITIVE
FEEDBACK
Q2
350mV
Q3
SHUTDOWN
COMPARATOR
350mV
6k
Q4
FROM
UNDERVOLTAGE
LOCKOUT
10
PWM LATCH
S
S
R
Q
LOCK-UP
AMPLIFIER
I L
3.5k
Q1
PWM COMPARATOR
"A" = 1
OUTPUT
OFF (LOW)
VREF
5.1V
2
V1
R2
16
LIMIT
BUFFER
AMPLIFIER
RS
R1
AMPLIFIER
1
+
–
+
–
+
–
+
–
–
+
+
–



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