Instruction/ maintenance manual of the product MB39A104 Fujitsu
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DS04-27231-3E FUJITSU SEMICONDUCT OR DA T A S H E E T ASSP F or P o wer Management Applications (Gener al Pur pose DC/DC Con v er ter) 2-c h DC/DC Con ver ter IC with Over current Pr otection MB39A104.
MB39A104 2 ■ PIN ASSIGNMENTS (TOP VIEW) (FPT-24P-M03) 1 2 3 4 5 6 7 8 9 10 11 12 VCCO : VH : OUT1 : VS1 : ILIM1 : DTC1 : VCC : CSCP : FB1 : − INE1 : CS1 : RT : 24 23 22 21 20 19 18 17 16 15 14 13 .
MB39A104 3 ■ PIN DESCRIPTION Pin No. Symbol I/O Descriptions 1V C C O Output circuit power supply terminal (Connect to same potential as VCC pin.
MB39A104 4 ■ BLOCK DIA GRAM − + + − + + − + + − + + − + + − + − + 10 VREF VREF 11 9 6 15 14 16 19 8 − INE1 CS1 FB1 DTC1 − INE2 CS2 FB2 DTC2 CSCP 12 13 18 17 RT CT GND VREF 24 7 23 2 20 21 22 5 4 3 1 CTL VCC GNDO VH ILIM2 VS2 OUT2 ILIM1 VS1 OUT1 VCCO 10 µ A 1.
MB39A104 5 ■ ABSOLUTE MAXIMUM RA TINGS * : The packages are mounted on the epo xy board (10 cm × 10 cm). W ARNING: Semiconductor de vices can be per manently damaged by application of stress (v oltage, current, temperature , etc.) in e xcess of absolute maximum ratings.
MB39A104 6 ■ ELECTRICAL CHARA CTERISTICS (VCC = VCCO = 12 V, VREF = 0 mA, T a = + 25 ° C) (Continued) Parameter Symbol Pin No Conditions Va l u e Unit Min Typ Max 1.
MB39A104 7 (Continued) (VCC = VCCO = 12 V, VREF = 0 mA, T a = + 25 ° C) *: Standard design v alue. P arameter Symbol Pin No. Conditions Va l u e Unit Min T yp Max 8.Error amplifier bolck [Error Amp1, Error Amp2] F requency bandwidth BW 9, 16 A V = 0 dB 1.
MB39A104 8 ■ TYPICAL CHARA CTERISTICS (Continued) Ta = + 25 ° C CTL = 5 V 10 8 6 4 2 0 0 5 10 15 20 Ta = + 25 ° C CTL = 5 V VREF = 0 mA 10 8 6 4 2 0 0 5 10 15 20 Ta = + 25 ° C VCC = 12 V CTL = 5 V 10 8 6 4 2 0 0 5 10 15 20 25 30 35 VCC = 12 V CTL = 5 V VREF = 0 mA 2.
MB39A104 9 (Continued) Ta = + 25 ° C VCC = 12 V CTL = 5 V CT = 39 pF 10000 1000 100 10 CT = 100 pF CT = 220 pF CT = 560 pF 1 10 100 1000 Ta = + 25 ° C VCC = 12 V CTL = 5 V RT = 11 k Ω 10000 1000 100 10 RT = 24 k Ω RT = 68 k Ω RT = 130 k Ω 10 100 1000 1000 0 Ta = + 25 ° C VCC = 12 V CTL = 5 V RT = 47 k Ω 3.
MB39A104 10 (Continued) − + + + 10 (15) 11 (14) 9 (16) IN OUT Error Amp1 (Error Amp2) 1 µ F 1.24 V 10 k Ω 2.4 k Ω 240 k Ω 10 k Ω 40 30 20 10 0 − 10 − 20 − 30 − 40 180 90 0 − 90 .
MB39A104 11 ■ FUNCTIONS 1. DC/DC Con ver ter Functions (1) Reference v oltage bloc k (REF) The ref erence voltage circuit generates a temper ature-compensated reference v oltage (5.0 V T yp) from the v oltage supplied from the power supply terminal (pin 7).
MB39A104 12 2. Contr ol Function When CTL ter minal (pin 24) is “L” le vel, IC becomes the standb y mode. The po wer supply current is 10 µ A (Max) at the standby mode .
MB39A104 13 ■ SETTING THE OUTPUT V OL T A GE ■ SETTING THE TRIANGULAR OSCILLA TION FREQUENCY The triangular oscillation frequency is deter mined by the timing capacitor (C T ) connected to the CT ter minal (pin 13), and the timing resistor (R T ) connected to the R T ter minal (pin 12).
MB39A104 14 ■ SETTING THE SOFT-ST ART AND DISCHARGE TIMES T o prev ent rush currents when the IC is tur ned on, you can set a soft-star t by connecting soft-star t capacitors (C S1 and C S2 ) to the CS1 ter minal (pin 11) f or channel 1 and the CS2 ter minal (pin 14) for channel 2, respectiv ely .
MB39A104 15 − + + 16 9 10 15 R1 R2 ( − INE2) CS1 (CS2) C S1 (C S2 ) − INE1 10 µ A FB1 (FB2) VREF V O Error Amp UVLO 1.24 V 11 14 L priority CH ON/OFF signal L : ON, H : OFF • Soft-Start Circu.
MB39A104 16 ■ TREA TMENT WITHOUT USING CS TERMINAL When not using the soft-star t function, open the CS1 ter minal (pin 11) and the CS2 ter minal (pin 14) .
MB39A104 17 ■ ABOUT TIMER-LA TCH PRO TECTION CIRCUIT 1. Setting Timer -Latch Overcurrent Pr otection Detection Current The ov ercurrent protection circuit is actuated upon completion of the soft-star t period.
MB39A104 18 Overcurrent Pr otection Circuit: Range of Operation When an ov ercurrent flow occurs, if the increased v oltage between the drain and source of the FET is detected by means of the e xter n.
MB39A104 19 2. Setting Time Constant f or Timer -Latch Short-Circuit Pr otection Circuit Each channel uses the shor t-circuit detection comparator (SCP Comp .) to alwa ys compare the error amplifier ′ s output le vel to the ref erence voltage (3.1 V T yp).
MB39A104 20 ■ TREA TMENT WITHOUT USING CSCP TERMINAL When not using the timer-latch shor t-circuit protection circuit, connect the CSCP ter minal (pin 8) to GND with the shor test distance.
MB39A104 21 ■ I/O EQUIV ALENT CIRCUIT 7 18 + − 1.24 V 17 VREF VCC GND 77.8 k Ω 24.8 k Ω CTL GND 72 k Ω 104 k Ω 24 CSX VCC GND VREF (5.0 V) RT GND (3.1 V) 12 + − 1.35 V VCC CSCP 2 k Ω GND VREF (5.0 V) 8 CT GND (3.1 V) 13 − INEX CSX GND VCC VREF (5.
MB39A104 22 ■ APPLICA TION EXAMPLE A B B + + A + + R10 R11 R9 68 k Ω 220 k Ω C16 0.1 µ F C12 1000 pF C14 1000 pF C21 1000 pF 150 k Ω 56 k Ω R15 R16 R14 68 k Ω 220 k Ω R13 C17 0.1 µ F 13 k Ω 100 k Ω R8 VIN (7 V to 19 V) R1 24 k Ω C1 100 pF C20 0.
MB39A104 23 ■ P ART S LIST Note : T OSHIBA : T OSHIBA Cor p oration ROHM : ROHM Co ., Ltd SANY O : SANY O Electric Co ., Ltd. TDK : TDK Cor poration SUMID A : SUMID A Electric Co ., Ltd. ssm : SUSUMU Co ., Ltd. COMPONENT ITEM SPECIFICA TION VENDOR P ARTS No .
MB39A104 24 ■ SELECTION OF COMPONENTS • Pch MOS FET The P-ch MOSFET f or s witching use should be rated f or at least 20% more than the maximum input voltage . T o minimize contin uity loss, use a FET with low R DS(ON) between the dr ain and source.
MB39A104 25 The abov e power dissipation figures f or the TPC8102 are satisfied with ample margin at 2.4 W (T a = + 25 ° C) . CH2 Input v oltage V IN (Max) = 19 V output voltage V O = 3.3 V, drain current I D = 3 A, Oscillation frequency f OSC = 500 kHz, L = 15 µ H, drain-source on resistance R DS (ON) : = 50 m Ω , tr = tf : = 100 ns.
MB39A104 26 The abov e power dissipation figures f or the TPC8102 are satisfied with ample margin at 2.4 W (T a = + 25 ° C) . • Inductors In selecting inductors, it is of course essential not to ap.
MB39A104 27 Example: CH1 CH2 Inductance v alues der ived from the abo ve f or mulas are v alues that provide sufficient margin f or continuous operation at maxim um load current, but at which contin uous operation is not possible at light loads .
MB39A104 28 T o deter mine whether the current through the inductor is within rated v alues, it is necessar y to determine the peak v alue of the r ipple current as well as the peak-to-peak v alues of the ripple current that affect the output ripple voltage .
MB39A104 29 • Flybac k diode The flyback diode is gener ally used as a Shottky barr ier diode (SBD) when the re verse v oltage to the diode is less than 40V . The SBD has the characteristics of higher speed in ter ms of f aster rev erse recov er y time, and low er f orw ard v oltage, and is ideal f or achieving high efficiency .
MB39A104 30 • Smoothing Capacitor The smoothing capacitor is an indispensable element f or reducing r ipple voltage in output. In selecting a smooth- ing capacitor it is essential to consider equiv alent ser ies resistance (ESR) and allowab le r ipple current.
MB39A104 31 CH2 Capacitance v a lue CH1 CH2 Ripple current CH1 CH2 ESR ≤ ∆ V O − 1 ∆ I L 2 π fC L ≤ 0.033 − 1 0.364 2 π × 500 × 10 3 × 82 × 10 − 6 ≤ 86.8 m Ω C L ≥ ∆ I L 2 π f ( ∆ V O − ∆ I L × ESR) ≥ 0.491 2 π × 500 × 10 3 × ( 0 .
MB39A104 32 ■ REFERENCE D A T A (Continued) Vin = 7 V Vin = 10 V Vin = 19 V Vin = 12 V 100 90 80 70 60 50 40 30 10 m 100 m 1 10 Vin = 7 V Vin = 10 V Vin = 19 V Vin = 12 V 100 90 80 70 60 50 40 30 10 m 100 m 1 10 TOTAL efficiency η ( % ) Input voltage V IN (V) TOTAL Efficiency vs.
MB39A104 33 (Continued) V G (V) 15 10 5 0 15 10 5 0 V S (V) t ( µ s) Ta = + 25 ° C VIN = 12 V CTL = 5 V V O = 5 V RL = 1.67 Ω 0123 4567 89 1 0 V G (V) 15 10 5 0 15 10 5 0 V S (V) t ( µ s) Ta = + 25 ° C VIN = 12 V CTL = 5 V V O = 3.
MB39A104 34 ■ USA GE PRECA UTION • • • • Printed cir cuit board gr ound lines should be set up with consideration for common impedance. • • • • T ake appropriate static electricity measures. • Containers f or semiconductor materials should ha v e anti-static protection or be made of conductive material.
MB39A104 35 ■ P A CKA GE DIMENSIONS 24-pin plastic SSOP (FPT-24P-M03) Note 1) *1 : Resin protrusion. (Each side : + 0.15 (.006) MAX) . Note 2) *2 : These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness.
MB39A104 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering.
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