MB3874 Datasheet, PDF (24/28 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Parallel Charging

MB3874/MB3876
• MB3876
Conversion efficiency vs.charge current
(Fixed voltage mode)
100
BATT1 charge voltage =16.8V,
98
fOSC = 282.71kHz, BATT2 = OPEN,
η(%)=(VBATT1 × IBATT1)/(Vin × Iin) × 100
96
94
Vin = 19 V
92
90
88
86
84
82
80
10 m
100 m
1
10
BATT1 charge current IBATT1 (A)
Conversion efficiency vs. charge voltage
(Fixed current mode)
100
98
BATT2 = OPEN,
BATT1 : Electronic load,
96
(Prouct of KIKUSUI PLZ-150W)
94
92
Vin = 19 V
90
R10 = 15 kΩ
88
86
84
82
80
0 2 4 6 8 10 12 14 16 18
BATT1 charge voltage VBATT1 (V)
Conversion efficiency vs.charge current
(Fixed voltage mode)
100
Parallel charging, BATT1 Charge voltage =16.8 V,
98 fOSC = 282.71 kHz,
η(%)=((VBATT1 × IBATT1)+(VBATT2 × IBATT2))/(Vin × Iin) × 100,
96 _{IBATTI = IBATT2}
94
92
Vin = 19 V
90
88
86
84
82
80
10 m
100 m
1
10
BATT1 charge current IBATT1 (A)
BATT voltage vs. BATT charge current
20
Vin = 19V,
18
BATT2 = open,
BATT1:Electronic load,
16
(Product of KIKUSUI
PLZ-150W)
14
12
10
Dead Battery MODE
DCC MODE
8
6
4
2
DCC : Dynamically-Controlled Charging
00.0 _{0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0}
BATT1 charge current IBATT1 (A)
100
98
96
94
92
90
88
86
84
82
80
0
Conversion efficiency vs. charge voltage
(Fixed current mode)
Parallel charging,
BATT1 : Electronic load,
(Prouct of KIKUSUI PLZ-150W),
IBATTI = IBATT2
Vin = 19 V
R10 = 15 kΩ
2 4 6 8 10 12 14 16 18
BATT1 charge voltage VBATT1 (V)
BATT voltage vs. BATT charge current
20
Parallel charging,
Vin = 19V,
18
BATT1: Electronic load,
16
(Product of KIKUSUI
PLZ-150W),
14
IBATTI = IBATT2
12
10
Dead Battery MODE
DCC MODE
8
6
4
2
DCC : Dynamically-Controlled Charging
00.0 _{0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0}
BATT1 charge current IBATT1 (A)
Note: KIKUSUI : KIKUSUI Electronics Corp.
24