Datasheet

LTC1877
7
1877fb
FUNCTIONAL DIAGRAM
+
–
+
–
+
–
+
–
+
–
OVDET
EA
+
–
I
RCMP
+
–
I
COMP
8
7
3
1
RUN
PLL LPF
VCO
X
Y
Y = “0” ONLY WHEN X IS A CONSTANT “1”
BURST
DEFEAT
SLOPE
COMP
OSC
SYNC/MODE
0.6V
FREQ
SHIFT
V
REF
0.8V
0.85V
7
g
m
= 0.5m
0.8V REF
SHUTDOWN
0.55V
0.8V
SLEEP
V
IN
V
IN
V
IN
V
IN
I
TH
SLEEP
V
FB
EN
BURST
V
IN
2
S
R
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI
SHOOT-
THRU
Q
Q
6Ω
6
SW
5
GND
1877 BD
4