Fujitsu MB3878 Uživatelský manuál Strana 1

DS04-27706-2EFUJITSU SEMICONDUCTORDATA SHEETASSP For Power Supply Applications (Secondary battery)DC/DC Converter IC for ChargingMB3878 DESCRIPTION

MB387810(Continued)Ta = +25 °CVCC = 19 VCTL = 5 V1 M100 k10 k10 k 100 k 1 MTa = +25 °CCTL = 5 VRT = 47 kΩ3403303203103002902802702602502400 5 10 15 20

MB387811(Continued)−+−+VCC = 19 VError Amp.1(Error Amp.2)(3)(5)(4)2.5 V10 kΩ2.4 kΩ240 kΩ10 kΩ5.2 V1 µFOUTINφAVTa = +25 °C40200−20−40180900−90−1801 k 1

MB387812 FUNCTIONAL DESCRIPTION1. DC/DC Converter Unit (1) Reference voltage block (Ref)The reference voltage generator uses the voltage supplied f

MB387813(7) PWM comparator block (PWM Comp.)The PWM comparator circuit is a voltage-pulse width converter for controlling the output duty of the error

MB387814 SETTING THE CHARGING VOLTAGEThe charging voltage (DC/DC output voltage) can be set by connecting external voltage setting resistors (R3,R4

MB387815 AC ADAPTOR VOLTAGE DETECTIONWith an external resistor connected to the +INE2 terminal(pin 3), the IC enters the dynamically-controlledchar

MB387816 PROCESSING WITHOUT USE OF THE CS PINIf the soft-start function is not used, the CS terminal (pin 22) should be left open.When no soft-star

MB387817 APPLICATION EXAMPLE 1+−−+8101312AB9+−−+422413× 25× 25+++−5202119−+++−11162217 6 231418<Current Amp.1><Error Amp.1>7VREF<C

MB387818 PARTS LIST (for APPLICATION EXAMPLE 1) Note VISHAY SILICONIX : VISHAY Intertechnology, Inc.MOTOROLA : Motorola Japan Ltd.SUMIDA : SUMIDA E

MB387819 REFERENCE DATA1009896949290888684828010 m 100 m 1 10100989694929088868482800 2 4 6 8 10 12 14 16181614121086420012345DCC : Dynamically Con

MB38782(Continued)• Built-in current detector amplifier with wide in-phase input voltage range : 0 V to Vcc• In standby mode, leave output voltage se

MB387820 APPLICATION EXAMPLE 2+−−+8101312ABCD9+−+−+−−+422413× 25× 25+++−5202119−+++−11162217 6 231418<Current Amp.1><Error Amp.1>7VRE

MB387821 PARTS LIST (for APPLICATION EXAMPLE 2) Note VISHAY SILICONIX : VISHAY Intertechnology, Inc.MOTOROLA : Motorola Japan Ltd.SUMIDA : SUMIDA E

MB387822 USAGE PRECAUTIONS• Printed circuit board ground lines should be set up with consideration for common impedance.• Take appropriate static e

MB387823 PACKAGE DIMENSION24-pin plastic SSOP (FPT-24P-M03) Note1: Pins width and pins thickness include plating thickness.Note2: * This dimensio

MB3878FUJITSU LIMITEDAll Rights Reserved.The contents of this document are subject to change without notice. Customers are advised to consult with FUJ

MB38783 PIN DESCRIPTIONPin No. Symbol I/O Descriptions1 −INC2 I Current detection amplifier (Current Amp. 2) input pin.2 OUTC2 O Current detection

MB38784 BLOCK DIAGRAM+−−+81013129+−−+422413× 25× 25+++−5202119−+++−11162217 6 231418<Current Amp.1><Error Amp.1>7VREF<Current Amp.

MB38785 ABSOLUTE MAXIMUM RAGINGS* : The package is mounted on the dual-sided epoxy board (10 cm × 10 cm).WARNING: Semiconductor devices can be per

MB38786 ELECTRICAL CHARACTERISTICS (Ta = +25 °C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA)* : Standard design value.(Continued)Parameter SymbolPin

MB38787 (Ta = +25 °C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA)* : Standard design value.(Continued)Parameter SymbolPin No.ConditionsValueUnitMin Typ

MB38788(Continued) (Ta = +25 °C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA)* : Standard design valueParameter SymbolPin No.ConditionsValueUnitMin Typ M

MB38789 TYPICAL CHARACTERISTICS(Continued)Ta = +25 °CCTL = 5 V1210864200 5 10 15 20 25Ta = +25 °CCTL = 5 VVREF = 0 mA10864200 5 10 15 20 25Ta = +25