Fujitsu MB39A105 Datasheet Download Page 15 | Manualshive

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MB39A105

15

1.0 V

0.9 V

0.8 V

0.7 V

0.3 V

t

•

Soft

-

start and short-circuit protection circuit timing chart

FB voltage

CSCP voltage

OSC
amplifier

Output short

Output

short

Soft-start time
t

S

Short-circuit detection time
t

CSCP

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Summary of Contents for MB39A105

Page 1: ...e short circuit protection detection output function prevents input output short on a chopper type up converter This product is covered by US Patent Number 6 147 477 FEATURES Power supply voltage range 1 8 V to 6 V Reference voltage accuracy 1 High frequency operation capability 1 MHz Max Built in standby function 0 µA Typ Built in timer latch short circuit protection circuit Built in short circui...

Page 2: ...MB39A105 2 PIN ASSIGNMENT TOP VIEW FPT 8P M05 INE CSCP VCC SCPOD 1 2 3 4 FB RT GND OUT 8 7 6 5 ...

Page 3: ...C Power supply terminal 4 SCPOD O Open drain output terminal for short circuit protection detection During timer latch short circuit protection operation Output High Z During normal operation Output L 5 OUT O External Nch FET gate drive terminal 6 GND Ground terminal 7 RT Triangular wave oscillation frequency setting resistor connection terminal 8 FB O Error Amplifier Error Amp output terminal ...

Page 4: ...2 INE FB CSCP 7 RT 6 5 GND OUT 4 3 SCPOD VCC VREF VREF Error Amp SCP Comp PWM Comp Drive Nch IO 400 mA at VCC 3 3 V 0 5 V 1 10 1 0 V UVLO OSC S Q R 0 9 V 0 7 V 0 3 V bias RT Current VREF Power ON OFF CTL VREF 1 27 V L UVLO release ...

Page 5: ...espect to uses operating conditions or combinations not represented on the data sheet Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand Parameter Symbol Condition Rating Unit Min Max Power supply voltage VCC VCC terminal 7 V Output current IO OUT terminal 35 mA Output peak current IOP Duty 5 t 1 fOSC Duty 700 mA Power dissip...

Page 6: ... kΩ 450 500 550 kHz Frequency temperature variation fOSC fOSC 5 Ta 0 C to 85 C 1 4 Soft start block CS Charge current ICS 2 CSCP 0 V 16 11 6 µA 5 Error amplifier block Error Amp Threshold voltage VTH 1 FB 0 5 V 0 495 0 5 0 505 V Input bias current IB 1 INE 0 V 120 30 nA Voltage gain AV 8 DC 70 dB Frequency band width BW 8 AV 0 dB 1 1 MHz Output voltage VOH 8 1 17 1 27 1 37 V VOL 8 40 200 mV Output...

Page 7: ...r Amplifier Threshold Voltage V TH V Error Amplifier Threshold Voltage vs Ambient Temperature Ambient temperature Ta C Triangular Wave Oscillation Frequency f OSC kHz Ta 25 C RT 7 5 kΩ 5 4 3 2 1 0 0 2 4 6 8 10 5 0 4 5 4 0 3 5 3 0 2 5 2 0 1 5 1 0 0 5 0 0 0 10 20 30 40 50 Ta 25 C VCC 3 3 V ICC Ta 25 C VCC 3 3 V 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 2 4 6 8 10 VCC 3 3 V RT 7 5 kΩ 0 52 0 51 0 ...

Page 8: ...ain and Phase vs Frequency Frequency f Hz Max On Duty Max On Duty vs Triangular Wave Oscillation Frequency Triangular wave oscillation frequency fOSC kHz Ta 25 C VCC 3 3 V 10000 1000 100 10 1 10 100 VCC 3 3 V RT 7 5 kΩ 600 550 500 450 400 40 20 0 20 40 60 80 100 Ta 25 C VCC 3 3 V 100 95 90 85 80 75 70 10 100 1000 10000 10 11 9 IN OUT Error Amp 1 µF 1 24 V 10 kΩ 2 4 kΩ 240 kΩ 10 kΩ 40 30 20 10 0 10...

Page 9: ...MB39A105 9 Continued 600 500 400 300 200 100 0 490 40 20 0 20 40 60 80 100 Power Dissipation vs Ambient Temperature Power dissipation P D mW Ambient temperature Ta C ...

Page 10: ...ng stable phase compensation to the system Also it is possible to prevent rush current at power supply start up by connecting a soft start capacitor with the CSCP terminal pin 2 which is the non inverted input terminal for Error Amp The use of Error Amp for soft start detection makes it possible for a system to operate on a fixed soft start time that is independent of the output load on the DC DC ...

Page 11: ...on circuit UVLO The transient state or a momentary decrease in supply voltage which occurs when the power supply is turned on may cause the IC to malfunction resulting in breakdown or degradation of the system To prevent such malfunctions under voltage lockout protection circuit detects a decrease in internal reference voltage with respect to the power supply voltage turns off the output FET and s...

Page 12: ...TION FREQUENCY The triangular oscillation frequency is determined by the timing resistor RT connected to the RT terminal pin 7 Triangular oscillation frequency fosc VO R1 R2 INE CSCP Error Amp 0 5 V VO V R1 R2 0 5 1 2 R2 Output Voltage Setting Circuit fosc kHz 3750 RT kΩ ...

Page 13: ...CSCP terminal voltages and the inverted input terminal voltage INE pin 1 voltage The FB terminal voltage is decided for the soft start period by the comparison between 0 5 V in an internal reference voltage and the voltages of the CSCP terminal The DC DC converter output voltage rises in proportion to the CSCP terminal voltage as the soft start capacitor connected to the CSCP terminal is charged T...

Page 14: ...se the capacitor CSCP is charged further When the capacitor CSCP is charged to about 1 0 V the latch is set and the external FET is turned off dead time is set to 100 At this time the latch input is closed and the CSCP terminal pin 2 is held at L level When CSCP terminal becomes L level SCPOD terminal Nch MOS FET becomes OFF SCPOD terminal pin 4 is held at L level and can be used as a short circui...

Page 15: ...5 1 0 V 0 9 V 0 8 V 0 7 V 0 3 V t Soft start and short circuit protection circuit timing chart FB voltage CSCP voltage OSC amplifier Output short Output short Soft start time tS Short circuit detection time tCSCP ...

Page 16: ...1 0 V INE CS GND VCC 1 27 V FB 0 5 V 1 8 RT GND VCC 7 0 33 V Soft start block CS Short circuit protection circuit block SCP Triangular wave oscillator block RT Error amplifier block Output block OUT GND VCC 5 ESD protection element ESD protection element ESD protection element ...

Page 17: ... 7 µF C3 4 7 µF C2 4 7 µF C1 0 1 µF L1 6 8 µH C5 4 7 µF C6 4 7 µF C7 0 1 µF D1 V O 9 0 V Q2 Q1 1 8 2 INE FB CSCP VIN 1 8 V to 6 0 V 7 RT Q3 6 5 GND OUT 4 3 SCPOD VCC VREF VREF Error Amp SCP Comp PWM Comp Drive Nch I O 400 mA at VCC 3 3 V 0 5 V 1 10 1 0 V UVLO OSC S Q R 0 9 V 0 7 V 0 3 V bias RT Current VREF Power ON OFF CTL VREF 1 27 V L UVLO release ...

Page 18: ... VF 0 40 V Max at IF 1 A SANYO SBS004 L1 Inductor 6 8 µH 1 4 A 144 mΩ SUMIDA CMD5D13 6R8 C1 C7 C9 C2 to C6 C8 Ceramics Condenser NeoCapacitor Ceramics Condenser 0 1 µF 4 7 µF 0 22 µF 50 V 10 V 10 V TDK NEC TOKIN TDK C1608JB1H104K TEPSLA21A475M8R C1608JB1A224K R1 R4 R5 R6 R7 R8 R11 Resistor Resistor Resistor Resistor Resistor Resistor 7 5 kΩ 51 kΩ 43 kΩ 330 kΩ 22 kΩ 100 kΩ 0 5 0 5 0 5 0 5 0 5 0 5 s...

Page 19: ...e selection must ensure that peak drain current does not exceed rated values Continuity loss PC On cycle switching loss PS ON Off cycle switching loss PS OFF Total loss PT PT PC PS ON PS OFF Example Using the SANYO MCH3405 Input voltage VIN Max 2 4 V output voltage VO 9 V drain current ID 0 94 A Oscillation frequency fOSC 500 kHz L 6 8 µH drain source on resistance RDS ON 160 mΩ tr 18 ns tf 8 ns D...

Page 20: ...d and this will also reduce efficiency The inductance must be set at the point where efficiency is greatest Note also that the DC superimposition characteristics become worse as the load current value approaches the rated current value of the inductor so that the inductance value is reduced and ripple current increases causing loss of efficiency The selection of rated current value and inductance ...

Page 21: ...ions IO To determine whether the current through the inductor is within rated values it is necessary to determine the peak value of the ripple current as well as the peak to peak values of the ripple current that affect the output ripple voltage The peak value and peak to peak value of the ripple current can be determined by the following formulas Peak value IL Peak to peak value IL Example Using ...

Page 22: ... the diode is within the mean output current level and peak current is within peak surge current limits there is no problem In this application the SANYO SBS004 is used The diode mean current and diode peak current can be calculated by the following formulas Diode mean current IDi Diode peak current IDip Example Using the SANYO SBS004 VR DC reverse voltage 15 V mean output current 1 0 A peak surge...

Page 23: ... should also be taken to use a capacity with sufficient margin for allowable ripple current This application uses the TEPSLA21A475M8R NEC TOKIN The ESR capacitance value and ripple current can be calculated from the following formulas Equivalent Series Resistance ESR Capacitance value CL Ripple current ICL Example Using the TEPSLA21A475M8R Three piecies are parallel Rated voltage 10 V ESR 500 mΩ m...

Page 24: ...0 V 100 90 80 70 60 50 40 30 1 m 10 m 100 m 1 Conversion efficiency η Load current IL A Conversion Efficiency vs Load current VG V 10 5 0 15 10 5 0 VD V t µs Ta 25 C VIN 3 3 V VO 9 V IO 100 mA 0 1 2 3 4 5 6 7 8 9 10 Switching Wave Form Ta 25 C 9 V output ...

Page 25: ... printed circuit boards should be stored and shipped in conductive bags or containers Work platforms tools and instruments should be properly grounded Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground Do not apply negative voltages The use of negative voltages below 0 3 V may create parasitic transistors on LSI lines which can cause abnormal operation O...

Page 26: ...05 Dimensions in mm inches 2002 FUJITSU LIMITED F08013Sc 1 1 3 00 0 10 118 004 4 40 0 10 6 40 0 20 252 008 173 004 1 10 043 MAX 0 65 026 0 10 004 0 8 0 22 0 10 009 004 0 127 0 03 0050 001 0 54 021 0 10 0 10 004 004 Details of A part 1 95 077 C INDEX 1 4 5 8 A ...

Page 27: ...c and could lead directly to death personal injury severe physical damage or other loss i e nuclear reaction control in nuclear facility aircraft flight control air traffic control mass transport control medical life support system missile launch control in weapon system or 2 for use requiring extremely high reliability i e submersible repeater and artificial satellite Please note that Fujitsu wil...

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