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TC170 Datasheet(PDF) 2 Page - Microchip Technology

Part No. TC170
Description  CMOS Current Mode PWM Controller
Download  16 Pages
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC170 Datasheet(HTML) 2 Page - Microchip Technology

 
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TC170
DS21395B-page 2
© 2002 Microchip Technology Inc.
Functional Block Diagram
5.1-Volt
Reference
Oscillator
x 3.15 Current
Amplifier
PWM
Comparator
Positive
Feedback
15
9
10
3
4
7
5
8
6
VIN
Sync
(–) Current
Sense Input
(+) Current
Sense Input
Comp
(+) Error
Amp Input
(–) Error
Amp Input
Error
Amplifier
100
µA
0.75V
Limit Buffer
Amplifier
Q4
350mV
Lock-up
Amplifier
Q3
Q1
Q2
3.5k
Shutdown
Comparator
350
mV
6k
Shutdown
Current Limit/
Soft-Start Adjust
NOTE: Outputs low in OFF state.
16
1
S
S
R
Q
C
DQ
Q
Ground
VDD
Output
A (
)
12
14
11
13
PWM Latch
TC170
VREF
2
+
RO
CO
VDD
+
+
+
+
+
Undervoltage
Lockout
Output
B (
)


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