LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 23

• Manufacturer Part Number: LTC4278CDKD#PBF
• Description: IC PD IEEE 802.3AT 25.5W 32-DFN
• Manufacturer: Linear Technology

Specifications of LTC4278CDKD#PBF

• Controller Type: Powered Device Interface Controller (PD)
• Interface: IEEE 802.3af
• Voltage - Supply: 4.5 V ~ 20 V
• Current - Supply: 6.4mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-DFN
• Input Voltage: 60V
• Supply Current: 1.35mA
• Digital Ic Case Style: DFN
• No. Of Pins: 32
• Duty Cycle (%): 88%
• Frequency: 100kHz
• Operating Temperature Range: °C To +70°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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