Fujitsu MB3878 manual Reference Data, Batt

Page 19

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

Image 19
Contents Description FeaturesPackage TOP View PIN AssignmentPIN Description Pin No Symbol DescriptionsBlock Diagram Parameter Parameter Symbol Conditions Rating Unit Min MaxAbsolute Maximum Ragings Recommended Operating ConditionsParameter Symbol Pin Conditions Value Unit Min Typ Electrical CharacteristicsOutd = 1 mA 100 On resistor Parameter Symbol Pin Conditions Value Unit Min Typ Max200 Amplifier block Output source Typical Characteristics Triangular wave oscillator Deg Functional Description Bias voltage block VH PWM comparator block PWM CompOutput block OUT Control block CTLMethod of Setting the Triangular Wave Oscillator Frequency Setting the Charging VoltageMethod of Setting the Charging Current Method of Setting the SOFT-START TimeAC Adaptor Voltage Detection Operation Timing DiagramVcco OUT VIN Batt Processing Without USE of the CS PINOUTC2 Application ExampleParts No Batt Reference DataVCC Vishay Siliconix MB3878PFV Usage PrecautionsOrdering Information Part number Package RemarksIndex Package DimensionFujitsu Limited