AUDIO SYSTEM POWER SUPPLY MB3794 multi-output, multi-function pow

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AUDIO SYSTEM POWER SUPPLY MB3794 multi-output, multi-function pow

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MB3794 AUDIO SYSTEM POWER SUPPLY
AUDIO SYSTEM POWER SUPPLY
MB3794 multi-output, multi-function power supply which developed audio systems, including digital tuning system. supplies microcomputer, 9.15V stage tuner, 8.4V FM/AM receiver compact cassette tape deck shares power among them. easy switch between CASSETTE, common power modes multiplex drive method enables signals received even while cassette tape deck being used. MB3794 complete system power supply. mounted 17-pin small package save space.
Multiple output ports (5.0V, 9.15V, four 8.4V) Multiple function ports (four control input ports three control output ports) Suitable components Control input constant-voltage output on/off control (except output) CMOS-compatible control input voltage saturation voltage (0.3V typical) Small backup current (380 typical) Small package (ZlP with radiation fin) Power supply surge voltage over-current protection circuits
OUT-CS START OUT-COM OUT-FM OUT-AM IN-FM IN-AM STBY IN-CS ASSIGNMENT (TOP VIEW)
ABSOLUTE MAXIMUM RATINGS (see Note) Rating
Input voltage Input surge voltage Power dissipation Storage temperature Output current
(GND +25_C)
Symbol
TSTG
Value
6.5* +150 OUT-FM OUT-AM,OUT-CS OUT-COM T1-B
Unit
*See Page Power Derating Characteristics
Note: Permanent device damage occur Absolute Maximum Ratings exceeded. Functional operation should restricted conditions detailed operational sections this data sheet. Exposure absolute maximum rating conditions extended periods affect device reliability.
This device contains circuitry protect inputs against damage high static voltages electric fields. However, advised that normal precautions taken avoid application voltage higher than maximum rated voltages this high impedance circuit.
MB3794
POWER SUPPLY
REFERENCE VOLTAGE POWER SUPPY CIRCUIT
REGULATOR
OUT-
SYSTEM
SYSTEM
POWER SUPPLY
BIAS CIRCUIT REGULATOR OUT-START OUTPUT)
REGULATOR
OUT-STBY OUTPUT)
REGULATOR IN-FM
(9.15V OUTPUT)
REFERENCE VOLTAGE CONTROL CIRCUIT VOLTAGE CIRCUIT
REGULATOR IN-AM REGULATOR
OUT-COM (8.4V OUTPUT)
OUT-FM (8.4 OUTPUT)
REGULATOR
OUT-AM (8.4V OUTPUT
IN-CS
REGULATOR
OUT-CS (8.4V OUTPUT)
Figure MB3794 Block Diagram
MB3794 FUNCTIONAL EXPLANATIONS PINS
Terminal
Terminal Name
IN-FM IN-AM IN-CS connected main battery. connected backup battery.
Function
CMOS-level control supplied output selection input with microcomputer. (Function table sequences
line connection check terminal. (Sequences level low, outputs turned off. terminal uses hysteresis compensate line noise. Power supply tuner such DEM. Power supply tuner. Power supply cassette tape deck, such equalizer amplifier. Select IN-CS this output. Power supply common system functions such tone control volume/balance control. Select IN-FM, IN-AM, IN-CS this output. Power supply varicap first stage tuner. Select IN-FM IN-AM this output. Control output circuit that standby function, that works same logic OUT-COM. Transmits system operation start information microprocessor according voltage. (Sequence Powers microprocessor receives power from supply cannot turned control input. (Sequence goes down, this output terminal resets microprocessor. (Sequence Improves ripple rejection ratio when voltage reduced. improvement, connect terminal ACC. usage, TERMINAL USAGE. Ground
OUT-FM OUT-AM OUT-CS OUT-COM
STBY START
MB3794 RECOMMENDED OPERATING CONDITIONS
(VACC VBU, Parameter
Input voltage Backup input voltage
Symbol
(ACC)
Name
OUT-FM
Min.
Typ.
13.2 13.2
Max.
Unit
Output current
OUT-AM, OUT-CS OUT-COM START, STBY
Operating temperature
MB3794 ELECTRICAL CHARACTERISTICS
VACC VBU, 25_C Standard Parameter Symbol Condition
VACC =10V VACC 9.5V VACC 9.8V Output Voltage VACC 9.5V VACC 9.8V VD01 VD02 VACC 9.5V VACC 9.5V VACC 9.5V VACC 9.5V VACC 7.5V Minimum Voltage Difference VD03 VD04 VD05 VD06 VD07 VD08 Output Offset Voltage VACC VACC Input Stability DVIN VACC VACC VACC START STBY START, STBY START STBY
Name
9.15
Unit
MB3794 ELECTRICAL CHARACTERISTICS, continued
VACC VBU, 25_C Standard Parameter Symbol Condition
VACC VACC 9.5V Load stability DVLoad VACC 9.8V VACC 9.5V VACC 9.8V VACC 9.5V VACC 7.5V Control terminal input voltage (FM, VACC 9.5V VIHC terminal input voltage VILC Control terminal input current (FM, IIHC terminal input current IILC VHYSC Hysteresis width VHYSR terminal output voltage terminal input current Backup input current Ripple rejection ratio Output voltage temperature coefficient VOLR IACCO IBUO R.R. DV/DT IRST VACC VACC 7.5V 13.2 7.5V 1VP.P 0.045 %/_C VACC 9.5V VACC 9.5V VACC 9.5V 1.34V, VACC 9.5V VACC 9.5V -0.3 1.14 -0.3 1.34 VACC
Name
Unit
MB3794 APPLICATION
IN-FM IN-AM
BACKUP POWER SUPPLY
CONTROL PANEL IN-CS
ACCESSORY POWER SUPPLY
START MICROCOMPUTER
MB3794
STBY
SEVERAL CONTROL SIGNALS
ANTENNA OUT-AM OUT-FM OUT-CS
TUNER DEMODULATION CIRCUIT TUNER
CASSETTE CIRCUIT CASSETTE
PRAMP EQUALIZER
MB3794 TERMINAL USAGE
terminal usually connected terminal. However, resistor RY), shown figure below, added ripple rejection ratio 8.4V output system (V02 V05) improved when voltage (nonstabilized area). time constant determined impedance (about terminal
output voltages when resistors added calculated from following expressions: With (ACC) With (ACC)
Note: standard value minimum voltage based conditions that value must more because output voltage limited minimum voltage difference.
MB3794 FUNCTION TABLE
Input Output STBY START outputs selection selection selection selection selection selection outputs Function
Note: Double selection increases heat dissipation, power consumption layout must designed carefully.
CONTROL SEQUENCE
System Input
INPUT OUTPUT STBY START
MB3794 CONTROL SEQUENCE (continued)
System
Standby Output (ACC System)
STBY OUTPUT
1.28V 1.28V 1.21V
STBY CHECK (INPUT) (HYSTERESIS ONLY)
Start Output (ACC System)
START (OUTPUT)
1.28V
1.21V
1.25V
1.28V
(INPUT)
START
Reset Output System)
4.10V
3.90V
3.90V
4.10V
MB3794 POWER DERATING CHARACTERISTICS
PERMISSIBLE DISSIPATION PD(W)
AMBIENT TEMPERATURE
Conditions: 2-mm thick radiation board 2-mm thick radiation board 2-mm thick radiation board radiation board
MB3794 PACKAGE DIMENSIONS
Rights Reserved. Circuit diagrams utilizing Fujitsu products included means illustrating typical semiconductor applications. Complete information sufficient construction purposes necessarily given. information contained this document been carefully checked believed reliable. However, Fujitsu assumes responsibility inaccuracies.
information contained this document does convey license under copyrights, patent rights trademarks claimed owned Fujitsu. Fujitsu reserves right change products specifications without notice. part this publication copied reproduced form means, transferred third party without prior written consent Fujitsu.
further information please contact: Japan FUJITSU LIMITED Integrated Circuits Semiconductor Marketing Furukawa Sogo Bldg., 6-1, Marunouchi 2-chome Chiyoda-ku, Tokyo 100, Japan Tel: (03) 3216-3211 Telex: 781-2224361 FAX: (03) 3216-9771 North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804 Tel: -922-9000 Telex: 910-671-4915 FAX: 408-432-9044 Europe FUJlTSU MlKROELEKTRONiK GmbH Arabella Centre 9.OG Lyoner Strasse 44-48 D-6000 Frankfurt F.R. Germany Tel: (069) 66320 Telex: 411963 FAX: (069) 6632122 Asia FUJITSU MICROELECTRONICS ASIA LIMITED Bras Basah Road, Plaza Park, #06-04/07, Singapore 0718 Tel: 336-1600 Telex: 55573 FAX: 336-1609 Printed Japan PV0079-902A2

AUDIO SYSTEM POWER SUPPLY MB3794 multi-output, multi-function pow

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