Datasheet

TC646B/TC648B/TC649B
DS21755C-page 2  2002-2013 Microchip Technology Inc.
Functional Block Diagram
TC646B/TC649B
Note: The V
OTF
comparator
is for the TC646B device only.
70 mV
(typ)
V
OTF
10 k
V
SHDN
V
IN
C
F
V
AS
GND
V
DD
V
OUT
FAULT
SENSE
Clock
Generator
Control
Logic
3xT
PWM
Timer
Start-up
Timer
Missing
Pulse
Detect
TC648B
V
OTF
V
SHDN
V
IN
C
F
V
AS
GND
V
DD
V
OUT
OTF
NC
Clock
Generator
Control
Logic
Start-up
Timer
Note