SWITCHING REGULATOR CONTROLLER MB3769A Fujitsu MB3769A pulse

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SWITCHING REGULATOR CONTROLLER MB3769A Fujitsu MB3769A pulse

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DS04-27202-3E
SWITCHING REGULATOR CONTROLLER
MB3769A
Fujitsu MB3769A pulse-width-modulation controller which applied fixed frequency pulse modulation technique. MB3769A contains wide band width Op-Amp high speed comparator construct very high speed switching regulator system kHz. Output suitable power drive owing adoption totem pole output. MB3769A provides stand-by mode voltage power supply when applied primary control system.
High frequency oscillator kHz) On-chip wide band frequency operation amplifier typ.) On-chip high speed comparator nsec typ.) Internal reference voltage generator provides stable reference supply
PLASTIC 16-PIN (DIP-16P-M04)
power dissipation (1.5 typ. standby mode, typ. operating
mode)
Output current peak) High speed switching operation nsec, nsec, 1000
typ.)
Adjustable Dead-time On-chip soft start quick shut down functions Internal circuitry prohibits double pulse dynamic current limit operation Under voltage lock function (OFF typ. OFF: typ.) On-chip output shut down circuit with latch function over voltage On-chip Zener diode
PLASTIC 16-PIN (FPT-16P-M06)
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.
MB3769A
ASSIGNMENT
(TOP VIEW)
(OP) (OP)
VREF
ABSOLUTE MAXIMUM RATINGS (See NOTE)
Rating Power Supply Voltage Output Current Operation Amp. Input Voltage Power Dissipation: Operating Temp. Storage Temp. Symbol IOUT (OP) TSTG Value (660*) 1000** 620*** +125 Unit
Duty package mounted epoxy board. 0.15
NOTE Permanent device damage occur above Absolute Maximum Ratings exceeded. Functional operation should restricted conditions detailed operational sections data sheet. Exposure absolute maximum rating conditions extended periods affect device reliability.
MB3769A
BLOCK DIAGRAM
Fig. MB3769A Block Diagram
Over Current Detection Comparator 1.85 VREF Comparator (OP)
Error Amp. Over Voltage Detector Power Triangle Wave Oscillator
(OP)
8/10
(2.5
15.4 Reference Regulator
VREF
MB3769A
RECOMMENDED OPERATING CONDITION
package Parameter SymboL VREF -100 -600 -0.2 -0.3 -0.3 VREF VCC-3 IOUT IOUT PEAK VINOP ISINK ISOURCE VINC+ -100 -600 -0.2 -0.3 -0.3 package Unit
Power Supply Voltage Output Current (DC) Output Current (Peak) Operation Amp. Input voltage Sink Current Source Current
Comparator Input Voltage VINCReference Section Output Current Timing Resistor Timing Capacitor Oscillator Frequency Zener Current Operating Temp. IREF fOSC
MB3769A
ELECTRICAL CHARACTERISTICS
(VCC=15V, TA=25°C) Value Parameter Output Voltage Symbol VREF VRIN VRLD VRTEMP fOSC fOSCIN fOSC Dmax Dset (OP) (OP) (OP) (OP) (OP) VREF VCC= IDTC= -0.3 Condition IREF IREF VREF RT=18 CT=680 1.55 -0.2 ±200 ±0.03 1.85 -0.3 ±750 ±300 µsec Unit
Input Regulation Reference Load Regulation Section Temp. Stability Short Circuit Output Current Oscillator Frequency Oscillator Section Voltage Stability Temp. Stability Input Bias Current Max. Duty Cycle Dead -time Duty Cycle Control Duty Section Input Cycle Threshold Max. Duty Voltage Cycle Discharge Voltage Input Offset Voltage Input Offset Current Input Bias Current Common-Mode Input Voltage Error Amplifier Section Voltage Gain Band Width Slew Rate Common-Mode Rejection Rate Level Output Voltage Level Output Voltage
MB3769A
ELECTRICAL CHARACTERISTICS (Continued)
(VCC=15V, TA=25°C) Value Parameter Input Offset Voltage Input Bias Current Symbol Condition over drive IOUT -100 IOUT 1000 1000 Open V11-7 1.55 12.5 -1.0 1.85 13.5 -0.2 10.0 15.4 0.03 10.8 12.0 nsec nsec nsec Unit
Current Comparator
Common-Mode Input VoltVCM Voltage Gain Response Time VOPO VOPM VOVP IIOVP VTHH VTHL ISTB
Comparator Section
Duty Cycle Max. Duty Cycle Level Output Voltage
Output Section
Level Output Voltage Rise Time Fall Time Threshold Voltage
Over Voltage Detector Under Voltage Stop
Input Current Reset Standby
Supply Current
Operating Zener Voltage Zener Current
MB3769A
Fig. MB3769A Test Circuit
15.0 OUTPUT
COMP (OP) (OP) VREF MB3769A 1000
VDTC
TEST INPUT <tr, typ. Voltage typ. 1.05 COMP COMP-in should within
0.95
OUTPUT
MB3769A
Fig. MB3769A Operating Timing
Soft Start Operation Dead-Time Input Voltage Triangle Wave Form Error Amp. Output
1.85V
Quick Shutdown Operation
Comparator Output Output Wave Form Comp. Current Wave Form Comp. Current Wave Form Comp. Current Latch Output Voltage Latch Power Supply Voltage Standby Mode Over Voltage Detector Latch (typ.) Over Current Detector
(typ.) Over Voltage Detector
Standby Mode
MB3769A
FUNCTIONS
Error Amplifier
error amplifier detects output voltage switching regulator. error amplifier uses high-speed operational amplifier with bandwidth (typical) V/ms slew rate (typical). ease use, common mode input voltage ranges from -0.2 VCC-3 Figure shows equivalent circuit.
Fig. MB3769A Equivalent Circuit Differential Amp.
VREF
(OP)
(OP)
Comp.
Protection element
Overcurrent Detection Comparator
There methods protection output transistor this device from overcurrents; restricts transistor's ontime overcurrent that flows through output transistor detected from average output current, other detects overcurrent external transistor (FET) shuts output down instantaneously. Using average output currents, peak current external transistor (FET) cannot detected, output transistor with large safe operation area (SOA) margin required. method detecting overcurrents external transistor (FET), output transistor protected against shorted filter capacitor power-on surge current. MB3769A uses dynamic current limiting detect overcurrents output transistor (FET). high-speed comparator flip-flop built-in. detect overcurrents, compare voltage +IN(C) current detection resistor connected source output transistor (FET), with reference voltage (connected -IN(C) using comparator. prevent output oscillation during overcurrent, flip-flop circuit protects against double pulses occurring within cycle. output overcurrent detector ORed with other signals comparator. example Application Example details use. Figure shows equivalent circuit over-current detection comparator.
MB3769A
Fig. MB3769A Equivalent Circuit Over Current Detection Comparator
VREF
Comp.
Protection element
DTC: Dead Time Control (Soft-Start Quick Shutdown)
dead time control terminal error amplifier output connected comparator. maximum duty cycle VDTC (voltage applied obtained from following formula (approximate value frequency): Duty Cycle (3.5 VDTC) duty cycle DMAX (80%) dead time control terminal used provide soft start. Figure terminal connected VREF terminal through Because capacitor does charge instantaneously when power turned output transistor kept turned off. input voltage output pulse width increase gradually according time constant that control system operates safely.
Fig. MB3769A Soft Start Function
VREF Soft Start Soft Start VREF
quick shutdown function prevents soft start malfunction when power turned quickly. After power shut down, soft start disabled because terminal electric potential from beginning power turned again before capacitor discharged. MB3769A prevents this turning discharge transistor quickly discharge capacitor stand-by mode.
MB3769A
Triangular Wave Oscillator
oscillation frequency expressed following formula: 0.0002 [kHz]
fOSC
master/slave synchronized operation several MB3769As, terminals master MB3769A connected usual terminals master slave device connected together. slave MB3769A's terminal connected it's VREF terminal disable slave's oscillator. this case, 50/n number master slave ICs) upper limit that internal bias currents stop master oscillation.
Fig. MB3769A Synchronized Operation
master VREF
slave
Overvoltage Detector
overvoltage detection circuit shuts system power down switching regulator's output voltage abnormal abnormal voltage appeared. reference voltage (VREF /2). system power shut down voltage rises above output kept shut down latching circuit until power supply turned (see Figure
Stand-by Mode Under-Voltage Lockout (UVLO)
Generally, required power MOSFET switching. UVLO that output (standard) when power turned (standard) when power turned off. stand-by mode, power supply current limited less when output inhibited UVLO circuit. When MB3769A operated from line, power supply current supplied through resistor (Figure That power supply current supplied line through resistor until operation starts. Current then supplied from transformer tertiary winding, eliminating need second power supply. volts (typical) hysteresis provided return from operation mode stand-by mode return stand-by mode until output power turned avoid malfunction noise.
MB3769A
Fig. MB3769A Primary Control
MB3769A
Output Section
Because output terminal (pin carries large current, collector emitter output transistor brought terminals. principle, connected connected GND, supplied from another power supply Note that should connected close package possible. capacitor more inserted between (see Figure Fig. MB3769A Typical Connection Circuit Output
MB3769A
APPLICATION EXAMPLE
Fig. MB3769A Convertor
1+IN (OP) 2-IN (OP) 4DTC 7GND VREF MB3769A
Overcurrent Protection Circuit
waveform output source terminal shown Figure time constant must chosen that voltage glitch waveform does cause erroneous overcurrent detection. This time constant should from detection current value depends because waveform weakened. keep this glitch small possible, rectifiers transformer secondary winding must fast-recovery type.
Fig. MB3769A Output Source Point
Glitch Point waveform
MB3769A
Fig. -Primary Control
+IN(OP) +IN(C) -IN(OP) -IN(C) VREF
*:The resistance
output current limiter required when driving which more than 1000 (CGS).
Secondly power supply
Fig. -Secondly Control
1000
+IN(OP) +IN(C) -IN(OP) -IN(C) VREF
MB3769A
SHORT PROTECTION CIRCUIT
system power shut down protect output against intermittent short-circuits continuous overloads. This protection circuit configured using input shown Figure
Fig. -Case (Over Protection Input) Primary Mode
output)
IN-B
MB3761
OUT-B HYS-A
IN-A
MB3769A
Fig. -Case (Over Protection Input) Secondly Mode
output) VREF MB3769A
IN-B IN-A OUT-B MB3761
HYS-A
MB3769A
SYNCHRONIZE WITH OUTSIDE CLOCK
MB3769A oscillator circuit shown Figure charge discharge currents expressed following formula:
Fig. -Oscillator Circuit
VREF
This circuit shows that voltage terminal less, oscillation cycle ends next cycle starts. example external synchronous clock circuit shown Figure
Fig. -Typical Connection Synchronized Outside Clock Circuit
tcycle MB3769A MB74HC04 R(5.1 clamp circuit (VL) tcycle (fEXT kHz)
Figure shows terminal waveform. near this case, maximum duty cycle restricted shown formula below Dmax= (3.5 1.85) (3.5 VTH) (3.5 (3.5 clamp circuit)
Fig. -Voltage Waveform
1.85
When provided followings. tcycle fOSC (3.5 (3.5 VTH) fOSC(3.5
MB3769A
fOSC
(tcycle [pF] (RT: tcycle,
Make high large duty cycle clamp circuit. circuits below used because clamp voltage must much lower than
Fig. -Clamp Circuit
VREF (4.7 (1.2 (1.2 (1.2
VREF MB3761
circuit must determined considering effects transistor saturation voltage must very small (<0.15 clamp circuit, transistor with very small (sat) should used.
MB3769A
SYNCHRONIZED OUTSIDE CLOCK CIRCUIT
Fig.
1.No Clamp Circuit (Connect with GND) V/div) Prove Capacitor V/div) Level (CT) V/div) MB74HC04
Fig.
2.Clamp Circuit (Dividing Resistor) V/div) Prove capacitor Level (CT) MB74HC04 VREF V/div)
V/div)
Fig.
3.Clamp Circuit (Apply MB3761)
V/div)
Prove capacitor MB74HC04 VREF MB3761
V/div)
Level (CT)
V/div)
MB3769A
Fig. -Test Circuit
(VCC) MB3769A
MB3769A
TYPICAL PERFORMANCE CHARACTERISTICS
Fig. -Power Supply Current Power Supply Voltage (Low Voltage stop VCC)
Power Supply Current (mA) Standly Current ISTB (mA) 10.0 12.0 16.0 20.0 operating operating Normal operating
Fig. -Standby Current vs.Temp.
Temp. (°C)
Power Supply Voltage
Reference Voltage VREF
Fig. -Reference Voltage Temp.
level Output Voltage IREF
Fig. -"L" level Output Voltage level Output Current
±750 µV/C
Temp. (°C)
level Output Current (mA)
Fig. -"H" level Output Voltage level Output Current
level Output Voltage level Output Current (mA)
MB3769A
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. -Oscillator Frequency
Oscillator Frequency fOSC (kHz)
"H", level Output Voltage
Fig. -"H", level Output Voltage Oscillator Frequency
1000 2200
Frequency fOSC (Hz)
Fig. -Oscillator Frequency Temp.
Oscillator Frequency fOSC
Fig. -Duty Cycle Dead Time Control Voltage
Dead Time Control Voltage VDTC fOSC fOSC Duty Cycle 1000
Target fOSC typ.
Temp. (°C)
Fig. -Dead Time Control Voltage Current(Standby Mode)
Dead Time Control Voltage VDTC
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 Dead Time Control Current IDTC (mA)
MB3769A
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. -Gain/Phase Frequency (Set
Gain (dB) Gain -360 Phase -180 -240 -300 Phase (deg) Duty Cycle
Fig. -Duty cycle Temp.
1000 VDTC
fOSC
fOSC
Frequency (Hz)
Temp. (°C)
Fig. -"L" level Output Voltage level Output Current
level Output Voltage level Output Current (mA) tr/tf/td (ns)
Fig. -tr/tf Output Comparator Temp.
1000
Fig. -"H" level Output Voltage level Output Current
level Output Voltage 14.0
13.5
13.0
12.5
Temp. (°C) level Output Current (mA)
MB3769A
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. -OVP Latch Standby Power Supply Current Temp.
Standby Power Supply Current (mA) open
Fig. -OVP Supply Voltage Reset Temp.
Supply Voltage Reset
Temp. (°C)
Temp. (°C)
MB3769A
PACKAGE DIMENSIONS
pin, Plastic (DIP-16P-M04)
19.55 -0.30 .770 -.012
+.008 +0.20
INDEX-1 INDEX-2 6.20±0.25 (.244±.010)
4.36(.172)MAX
0.51(.020)MIN 0.25±0.05 (.010±.002)
3.00(.118)MIN
0.46±0.08 (.018±.003)
+0.30 +.012 +0.30 +.012
0.99 .039 1.27(.050)
1.52
.060 2.54(.100)
7.62(.300)
15°MAX
1994 FUJITSU LIMITED D16033S-2C-3
Dimensions (inches).
(Continued)
MB3769A
(Continued)
pin, Plastic (DIP-16P-M04)
2.25(.089)MAX 10.15
+0.25 -0.20
.400
+.010 -.008
0.05(.002)MIN (STAND OFF)
INDEX
5.30±0.30 (.209±.012)
7.80±0.40 (.307±.016)
6.80 -0.20 +.016 .268 -.008
+0.40
1.27(.050)
0.45±0.10 (.018±.004)
0.15 -0.02 +.002 .006 -.001 Details part 0.40(.016)
+0.05
0.50±0.20 (.020±.008)
Details part 0.15(.006) 0.20(.008)
0.10(.004) 8.89(.350)REF
0.20(.008) 0.18(.007)MAX 0.68(.027)MAX 0.18(.007)MAX 0.68(.027)MAX
1994 FUJITSU LIMITED F16015S-2C-4
Dimensions (inches).
MB3769A
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: (044) 754-3763 Fax: (044) 754-3329
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherently certain rate failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Control Japan, prior authorization Japanese government should required export those products from Japan.
http://www.fujitsu.co.jp/
North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. Fri.: (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9803 FUJITSU LIMITED Printed Japan

SWITCHING REGULATOR CONTROLLER MB3769A Fujitsu MB3769A pulse

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