LT4276
17
4276fa
For more information www.linear.com/LT4276
Typical applicaTions
+
V
OUT
5V AT 4.7A
–V
OUT
Q1
L1: COILCRAFT, DO1813P-181HC
L2: COILCRAFT, DO1608C-103
L4: COILCRAFT, DO1608C-104
C2, C3: 22µF, 6.3V, MURATA GRM31CR70J226KE19
C5: 47µF, 6.3V, PANASONIC 6SVP47M
C7: 2.2µF, 100V, MURATA GRM32ER72A225KA35
T1: WÜRTH, 750313082 OR PCA EPC3409G
Q1-Q9: PSMN075-100MSE
T2: PCA EPA4271GE OR PULSE PE-68386NLL2
10µH
L1
180nH
L4
100µH
10µF
100V
10nF
100V
3.3k
24V
8.2Ω
10µF
10V
HSSRC
SWVCC FB31
PG
SG
T2P
ITHBROSCSFSTFFSDLYRCLASSGND
VPORT
LT4276B
HSGATE
ISEN
+
ISEN
–
V
IN
V
CC
C7
2.2µF
BSZ520N15NS3G
BAT54WS
BAT46WS
TO MICROPROCESSOR
4276 TA03
PSMN2R4-30MLD
MMBT3906 MMBT3904
T1
1nF
1µF
5.90k20Ω
2k
160Ω||160Ω
1/4W
5.1Ω
1/4W
40mΩ
1/4W
15Ω
100Ω
1µF
220pF
0.1µF
107k7.50k35.7Ω
PTVS58VP1UTP
3.3nF
2.2nF
2KV
20k
10k
2.2nF
C2, C3
22µF
||
22µF
C5
47µF
100pF
100V
47nF
100V
2.2nF
2kV
OPTO
BG36
LT4321
BG12TG12 TG36
TG78TG45BG45 BG78
OUTP
OUTN
EN
EN
IN12
T2
Q2 Q3
Q4 Q5
Q6 Q7
Q8 Q9
1
DATA
PAIRS
SPARE
PAIRS
2
3
6
4
5
7
8
IN36
IN45
IN78
47nF
100V
BAV19WS
••
•
•
•
FMMT723
25.5W (Type 2) PoE
+
Power Supply in Flyback Mode with 5V, 4.7A Output
Efficiency vs Load Current V
OUT
vs Load Current
LOAD CURRENT (A)
0.5
78
EFFICIENCY (%)
92
90
88
86
84
82
80
94
2.01.5 3.0 3.5 4.0 4.52.5 5.01.0
4276 TA03a
VPORT = 42.5V
VPORT = 50V
VPORT = 57V
LOAD CURRENT (A)
0.5
4.80
V
OUT
(V)
5.15
5.10
5.05
5.00
4.95
4.90
4.85
5.20
2.01.5 3.0 3.5 4.0 4.52.5 5.01.0
4276 TA03b
VPORT = 42.5V
VPORT = 50V
VPORT = 57V
