Fujitsu MB3887 manual Processing Without Using of the CS Terminal

Page 23

MB3887

■PROCESSING WITHOUT USING OF THE CS TERMINAL

When soft-start function is not used, leave the CS terminal (pin 22) open.

“Open”

CS 22

Connection when soft-start time is not specified

■NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE

•Insert a reverse-current preventive diode at one of the three locations marked * to prevent reverse current from the battery.

•When selecting the reverse current prevention diode, be sure to consider the reverse voltage (VR) and reverse current (IR) of the diode.

VCC(O)

21

OUT

20

VH 19

VIN

∗

	A B
∗	I1	BATT
	RS	BATT
	RS
	∗
	Battery

23

Image 23

Contents Package FeaturesDescription MB3887 TOP View PIN AssignmentPIN Description Pin No Symbol DescriptionsBlock Diagram Absolute Maximum Ratings Parameter Symbol Conditions Rating Unit Min MaxRecommended Operating Conditions Parameter Symbol Conditions Value Unit Min TypBol Min Typ Electrical CharacteristicsParameter Sym Pin Conditions Parameter Sym Pin Conditions Value Unit Bol Min Typ Max Parameter Sym Pin Conditions Value Unit Bol Min Typ OUT = −45 mA Output block Resistor Typical Characteristics Triangular wave oscillation frequency fOSC kHz Error amplifier gain and phase vs. Frequency Gain a Power dissipation vs. Ambient temperature Functional Description Control block CTL PowerPWM comparator block PWM Comp Output block OUTSoft-start block Soft Setting the Charging VoltageMethod of Setting the Charging Current Method of Setting the Triangular Wave Oscillation FrequencyMethod of Setting the SOFT-START Time AC Adaptor Voltage Detection Operation Timing DiagramConnection when Current Amp is not used Processing Without Using the Current AMPConnection when Error Amp is not used Processing Without Using of the Error AMPConnection when soft-start time is not specified Processing Without Using of the CS TerminalAt 4 cell Application ExampleParts No Parts ListReference Data Batt Vbatt mV Ta = +25 C, VIN = 19 Batt = 12 Ω Part number Package Remarks Usage PrecautionsOrdering Information Index Package DimensionFujitsu Limited