Fujitsu MB39A104 User Manual

DS04-27231-3EFUJITSU SEMICONDUCTORDATA SHEETASSP For Power Management Applications (General Purpose DC/DC Converter) 2-ch DC/DC Converter ICwith Over

MB39A10410(Continued)−++ +10(15)11(14)9(16)INOUTError Amp1(Error Amp2)1 µF1.24 V10 kΩ2.4 kΩ240 kΩ10 kΩ403020100−10−20−30−40180900−90−180100 1 k

MB39A10411 FUNCTIONS1. DC/DC Converter Functions (1) Reference voltage block (REF) The reference voltage circuit generates a temperature-compensated r

MB39A104122. Control FunctionWhen CTL terminal (pin 24) is “L” level, IC becomes the standby mode. The power supply current is 10 µA (Max)at the stand

MB39A10413 SETTING THE OUTPUT VOLTAGE SETTING THE TRIANGULAR OSCILLATION FREQUENCYThe triangular oscillation frequency is determined by the timing cap

MB39A10414 SETTING THE SOFT-START AND DISCHARGE TIMESTo prevent rush currents when the IC is turned on, you can set a soft-start by connecting soft-st

MB39A10415−++1691015R1R2(−INE2)CS1(CS2)CS1(CS2)−INE110 µAFB1(FB2)VREFVOError AmpUVLO1.24 V1114L priorityCH ON/OFF signalL : ON, H : OFF• Soft-Start Ci

MB39A10416 TREATMENT WITHOUT USING CS TERMINALWhen not using the soft-start function, open the CS1 terminal (pin 11) and the CS2 terminal (pin 14) .11

MB39A10417 ABOUT TIMER-LATCH PROTECTION CIRCUIT1. Setting Timer-Latch Overcurrent Protection Detection CurrentThe overcurrent protection circuit is ac

MB39A10418Overcurrent Protection Circuit: Range of OperationWhen an overcurrent flow occurs, if the increased voltage between the drain and source of

MB39A104192. Setting Time Constant for Timer-Latch Short-Circuit Protection CircuitEach channel uses the short-circuit detection comparator (SCP Comp.

MB39A1042 PIN ASSIGNMENTS (TOP VIEW) (FPT-24P-M03) 123456789101112VCCO :VH :OUT1 :VS1 :ILIM1 :DTC1 :VCC :CSCP :FB1 :−INE1 :CS1 :RT :24232221201918171

MB39A10420 TREATMENT WITHOUT USING CSCP TERMINALWhen not using the timer-latch short-circuit protection circuit, connect the CSCP terminal (pin 8) to

MB39A10421 I/O EQUIVALENT CIRCUIT718+−1.24 V17VREFVCCGND77.8kΩ24.8kΩCTLGND72kΩ104kΩ24CSXVCCGNDVREF(5.0 V)RTGND(3.1 V)12+−1.35 VVCCCSCP2 kΩGNDVREF(5.0

MB39A10422 APPLICATION EXAMPLEABB+ +A++R10R11R968 kΩ220kΩC160.1µFC121000 pFC141000 pFC211000 pF150 kΩ56 kΩR15R16R1468 kΩ220kΩR13C170.1µF13 kΩ100 kΩR8V

MB39A10423 PARTS LISTNote : TOSHIBA : TOSHIBA CorporationROHM : ROHM Co., LtdSANYO : SANYO Electric Co., Ltd.TDK : TDK CorporationSUMIDA : SUMIDA

MB39A10424 SELECTION OF COMPONENTS• Pch MOS FETThe P-ch MOSFET for switching use should be rated for at least 20% more than the maximum input voltage.

MB39A10425The above power dissipation figures for the TPC8102 are satisfied with ample margin at 2.4 W (Ta = +25 °C) .CH2Input voltage VIN (Max) = 1

MB39A10426The above power dissipation figures for the TPC8102 are satisfied with ample margin at 2.4 W (Ta = +25 °C) .• InductorsIn selecting induct

MB39A10427Example:CH1CH2Inductance values derived from the above formulas are values that provide sufficient margin for continuousoperation at maximum

MB39A10428To determine whether the current through the inductor is within rated values, it is necessary to determine thepeak value of the ripple curre

MB39A10429• Flyback diodeThe flyback diode is generally used as a Shottky barrier diode (SBD) when the reverse voltage to the diode isless than 40V.

MB39A1043 PIN DESCRIPTIONPin No. Symbol I/O Descriptions1VCCO Output circuit power supply terminal (Connect to same potential as VCC pin.) 2 VH O Pow

MB39A10430• Smoothing CapacitorThe smoothing capacitor is an indispensable element for reducing ripple voltage in output. In selecting a smooth-ing ca

MB39A10431CH2Capacitance valueCH1CH2Ripple currentCH1CH2ESR ≤ ∆VO − 1∆IL 2πfCL ≤ 0.033 − 10.364 2π × 500 × 103 × 82 × 10−6 ≤ 86.8 mΩCL ≥ ∆IL2πf (∆VO

MB39A10432 REFERENCE DATA(Continued)Vin = 7 VVin = 10 VVin = 19 VVin = 12 V1009080706050403010 m 100 m 1 10Vin = 7 VVin = 10 VVin = 19 VVin = 12 V1009

MB39A10433(Continued)VG (V)151050151050VS (V)t (µs)Ta = +25 °CVIN = 12 VCTL = 5 VVO = 5 VRL = 1.67 Ω012345678910VG (V)151050151050VS (V)t (µs)Ta = +25

MB39A10434 USAGE PRECAUTION•••• Printed circuit board ground lines should be set up with consideration for common impedance.•••• Take appropriate sta

MB39A10435 PACKAGE DIMENSIONS24-pin plastic SSOP (FPT-24P-M03) Note 1) *1 : Resin protrusion. (Each side : +0.15 (.006) MAX) .Note 2) *2 : These dime

MB39A104FUJITSU LIMITEDAll Rights Reserved.The contents of this document are subject to change without notice. Customers are advised to consult with F

MB39A1044 BLOCK DIAGRAM−++−++−++−++−++−+−+10VREFVREF1196151416198−INE1CS1FB1DTC1−INE2CS2FB2DTC2CSCP12 13 1817RT CT GNDVREF2472322021225431CTLVCCGNDOV

MB39A1045 ABSOLUTE MAXIMUM RATINGS* : The packages are mounted on the epoxy board (10 cm × 10 cm).WARNING: Semiconductor devices can be permanently da

MB39A1046 ELECTRICAL CHARACTERISTICS (VCC = VCCO = 12 V, VREF = 0 mA, Ta = +25 °C)(Continued)ParameterSymbolPin No ConditionsValueUnitMin Typ Max1.Ref

MB39A1047(Continued) (VCC = VCCO = 12 V, VREF = 0 mA, Ta = +25 °C)*: Standard design value.Parameter Symbol Pin No. ConditionsValueUnitMin Typ Max8.Er

MB39A1048 TYPICAL CHARACTERISTICS(Continued)Ta = +25 °CCTL = 5 V10864200 5 10 15 20Ta = +25 °CCTL = 5 VVREF = 0 mA10864200 5 10 15 20Ta = +25 °CVCC =

MB39A1049(Continued)Ta = +25 °CVCC = 12 VCTL = 5 VCT = 39 pF10000100010010CT = 100 pFCT = 220 pFCT = 560 pF1 10 100 1000Ta = +25 °CVCC = 12 VCTL = 5