LTC4269-1 Linear Technology Corporation, LTC4269-1 Datasheet - Page 23

• Manufacturer Part Number: LTC4269-1
• Description: IEEE 802.3 At PD And Synchronous No-Opto Flyback Controller
• Manufacturer: Linear Technology Corporation

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APPLICATIONS INFORMATION
R1
R2
16
FB
MOSFET DRAIN
PRIMARY-SIDE
–
PG VOLTAGE
SG VOLTAGE
VOLTAGE
1V
+
ENABLE
COLLAPSE
DETECT
LTC4269-1 FEEDBACK AMP
Figure 10a. LTC4269-1 Switching Regulator Feedback Amplifi er
1.237V
V
Figure 10b. LTC4269-1 Switching Regulator Timing Diagram
IN
V
FB
–
+
R
S
Q
t
ON(MIN)
V
ENABLE
V
DELAY
FLBK
CMP
17
42691 F10a
MIN ENABLE
AMPLIFIER
FEEDBACK
ENABLED
C
V
VCMP
FLBK
MP
PRIMARY
FLYBACK
V
IN
•
•
PG DELAY
T1
•
SECONDARY
0.8 • V
42691 F10b
MS
FLBK
+
LTC4269-1
C
OUT
ISOLATED
OUTPUT
23
42691f