Datasheet

LTC4278
23
4278fc
APPLICATIONS INFORMATION
+
–
V
FB
1.237V
ENABLE
COLLAPSE
DETECT
1V
LTC4278 FEEDBACK AMP
FB
R1
R2
16
17
V
CMP
V
IN
PRIMARY
FLYBACK
SECONDARY
•
•
•
MP
T1
V
FLBK
MS
C
VCMP
4278 F10a
C
OUT
ISOLATED
OUTPUT
+
S
R
Q
–
+
PRIMARY-SIDE
MOSFET DRAIN
VOLTAGE
PG VOLTAGE
SG VOLTAGE
V
IN
t
ON(MIN)
ENABLE
DELAY
MIN ENABLE
FEEDBACK
AMPLIFIER
ENABLED
PG DELAY
4278 F10b
V
FLBK
0.8 • V
FLBK
Figure 10a. LTC4278 Switching Regulator Feedback Amplifier
Figure 10b. LTC4278 Switching Regulator Timing Diagram