Fujitsu MB3878 manual Reference Data, Batt

MB3878

■REFERENCE DATA

Conversion efficiency η (%)

Conversion efficiency vs. charge current	Conversion efficiency vs. charge voltage
(Fixed voltage mode)	(Fixed current mode)

100	VIN = 19 V					100			VIN = 19 V
98					(%)	98
	BATT charge voltage = 12.6 V		fOSC = 277.9 kHz						BATT : Electronic load,
96	η (%) = (VBATT ⋅ IBATT)	/ (VIN ⋅ IIN)		⋅ 100	η	96			(Product of KIKUSUI PLZ-150W)
94					efficiency	94
92						92
90						90
88					Conversion	88
86						86
84						84
82						82
80						80
10 m	100 m	1		10		0	2	4	6	8	10	12	14	16

BATT charge current IBATT (A) BATT charge voltage VBATT (V)

BATT voltage vs. BATT charge current

	18		VIN = 19 V
	16
(V)			BATT : Electronic load,
	14		(Product of KIKUSUI PLZ-150W)
BATT
	12
V	10
voltage		Dead Battery MODE			DCC MODE
	8
	6
BATT	4
	2		DCC : Dynamically Controlled Charging
	0
	0	1	2	3	4	5

BATT charge current IBATT (A)

Soft-start operating waveforms

DC/DC converter switching waveforms

=

BATT (V) 20

15

CTL (V) 10

205

150

			VIN = 19 V
			Load : BATT = 20 Ω
			−INE2 = 0 V
	5 V
	5 V			20 ms
0	40	80	120	160	200

OUTH (V) 20

15

10

5

0

FB3 (V) 4

2

0

			VIN	19 V
			fOSC = 277.9 kHz
			Load : BATT = 1 A
	5 V
	2 V			1 ∝s
0	2	4	6	8	10
					∝

t (ms)

t ( s)

19