ASSP Power Supplies BIPOLAR Switching Regulator Controller

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ASSP Power Supplies BIPOLAR Switching Regulator Controller

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DS04-27205-4E
ASSP Power Supplies
BIPOLAR
Switching Regulator Controller
MB3782
DESCRIPTION
FUJITSU MB3782 PWM-type switching regulator controller, designed with open-collector output connection external drive transistors coils, providing selection three types output voltage: stepup, step-down inverting (inverting output available circuit only). MB3782 features identical oscillator output waveforms enable completely synchronous operation prevent occurrence low-frequency beat between channels. Also, MB3782 features power dissipation (2.1 typ) built-in standby mode µA), making possible configuration wide variety high-efficiency, stable power supplies, even with battery power. MB3782 ideal power supply high-performance portable devices such video camcorders cameras.
FEATURES
Wide voltage range (3.6 power dissipation (operating mode: (typ), standby mode: (max) Wide range oscillator frequencies, high-frequency capability kHz) On-chip timer-latch type short detection circuit On-chip undervoltage lockout circuit On-chip 2.50 reference voltage circuit (1.25 output available pin) Dead time adjustment over full duty cycle range On-chip standby mode (power on/off function)
(Continued)
PACKAGE
Plastic Plastic
(DIP-20P-M01)
(FPT-20P-M01)
MB3782
ASSIGNMENT
VIEW
VREF DTC1 PUT1 OUT2 DTC3 OUT3 DTC2
(DIP-20P-M01) (FPT-20P-M01)
DESCRIPTION
Name VREF Description 2.50 (typ) voltage output: provides load current error amplifier reference input dead time setting. Oscillator timing capacity connection: should used capacity range 15000 Oscillator timing resistor connection: should used resistance range This also provide output voltage level VREF/2, error amplifier reference input. Error amplifier non-inverting input pin. Error amplifier inverting input pin. Error amplifier output pin: connect resistor capacitor between this -IN1 gain adjust frequency characteristics. OUT1 dead time setting pin: VREF voltage divided external resistor applied dead time. Also, capacitor connected between this perform soft start operations.
+IN1 -IN1
DTC1*
(Continued)
MB3782
(Continued)
Name VOUT1 OUT2
Description Open collector type output with emitter connected GND. Output current Ground Open collector type output with emitter connected GND. Output current Used OUT2 dead time. VREF voltage divided external resistor applied dead time. Also, capacitor connected between this perform soft start operations. Error amplifier output pin: connect resistor capacitor between this -IN2 gain adjust frequency characteristics. Error amplifier inverting input pin. Time constant setting capacitor connection timer-latch type short prevention circuit: capacitor should connected between this pin. details, Setting Time Constant Timer-Latch Type Short Prevention Circuit." Open collector type output emitter connected GND. Output current Used OUT3 dead time. VREF voltage divided external resistor applied dead time. Also, capacitor connected between this perform soft start operations. Error amplifier output pin: connect resistor capacitor between this -IN3 gain adjust frequency characteristics. Error amplifier inverting input pin. Power supply control pin: level places standby mode reduces power consumption lower. Input level driven CMOS. Power supply pin: voltage range
DTC2*1
-IN2
SCP*2
OUT3
DTC3*
-IN3
(Continued)
Dead Time Control Short Circuit Protection
MB3782
BLOCK DIAGRAM
VREF
1.25
Triangular wave oscillator
Reference voltage source
Power on/off control circuit
Error Amp.1 DTC1
Comp. Ch.1
OUT1
Error Amp.2
Comp.
1.25
Ch.2
OUT2
DTC2
Error Amp.3
Comp.
1.25
Ch.3
OUT3
DTC3
Comp. VREF
Latch
U.V.L.O.
MB3782
FUNCTIONAL DESCRIPTIONS
Reference Voltage Source
reference voltage source uses voltage provided power supply (pin generate temperature-compensated reference voltage 2.50 which used operating power supply internal circuits reference voltage source output through VREF (pin
Triangular Wave Oscillator
connecting timing capacitor resistor respectively (pin (pin oscillator provide triangular waveform desired frequency. waveform amplitude connected non-inverting input onchip comparator also output through pin.
Error Amps
error amps amplifiers that detect output voltage switching regulator send control signal. common-mode input voltage range 1.05 1.45 that voltage applied non-inverting input reference voltage should either voltage obtained dividing reference voltage output (recommended value: VREF/2) voltage obtained from (1.25 non-inverting input error amps internally connected VREF/2 voltage. Also, feedback transistor capacitor connected between error output inverting input provide desired level loop gain, enabling stable phase compensation.
Timer Latch (S-R Latch) Type Short Prevention Circuit
timer-latch type short prevention circuit detects output levels from each error amps. Whenever more error amps produces output level higher, timer circuit activated starting charging external protection enabler capacitor. error output voltage does return normal range before voltage this capacitor reaches transistor's base-emitter junction voltage (VBE 0.65 V)), latch circuit will operate turn output transistor same time dead time 100%. Once prevention circuit activated, power must switched again resume normal operation.
Input Voltage Fault Prevention Circuit (Under Voltage Lock-Out (UVLO) function)
When power switched excess power momentary drops power line current cause operating faults controller which turn lead damage deterioration systems. input voltage fault prevention circuit detects internal reference voltage level with respect power supply voltage level acts reset latch circuit, thereby turning output transistor same time setting dead time 100% holding (pin "low." Operation returns normal when power supply voltage reaches exceeds UVLO threshold voltage level.
Comparator
comparator voltage comparator with inverting non-inverting inputs, which acts voltage pulse width converter controlling on-time output pulse according input voltage level. When triangular waveform produced oscillator lower than either error output voltage, output transistor switched
MB3782
also possible terminal provide soft start function.
Output Transistor
output open-collector type, with emitter output transistor connected pin. power transistor external switching carry base current
Power Supply Control
Power supply on/off control enabled through (pin 19). standby mode, power supply current less.)
MB3782
SETTING TIME CONSTANT TIMER-LATCH TYPE SHORT PREVENTION CIRCUIT
Figure shows configuration protection latch circuit. output lines from error amps each connected inverting input lines short protection comparator, which constantly compares them with reference voltage approximately connected non-inverting input. When load conditions switching regulator stabilized, there variation output from error amps, therefore short prevention controls held equilibrium. this situation, voltage (pin held approximately When load conditions change rapidly, case load short, high potential signal (greater than 2.1V) from error amps input inverting signal input short protection comparator, short protection comparator outputs "low" level signal. transistor consequently switched off, that short protection capacitor externally connected voltage then charged according following formulas. 10-6/CPE 0.65 10-6/CPE tPE/0.6 (µF) When short protection capacitor charged level approximately 0.65 latch input voltage fault prevention circuit enabled, turning output drive transistor off. same time, dead time 100% (pin held "low." This closes latch input then discharges capacitor
2.50 S.C.P.Comp. Error Amp.1 Error Amp.2 Error Amp.3 U.V.L.O. Comp.
Latch
Figure
Protection Latch Circuit
MB3782
SETTING OUTPUT VOLTAGE
following diagrams show connections used output voltage. Because power supply error amps provided same reference voltage circuit used other internal circuits, common-mode input voltage range 1.05 1.45 reference voltage input pins should 1.25 (VREF/2). method connection channel different from channel channel addition, channel capable picking both positive negative voltages, while channel channel pick only positive output voltages.
VREF VREF
Figure
Error (channel connection: Output voltage positive
VREF VREF VREF
Figure
Error (channel connection: Output voltage positive
MB3782
1.25
12,17
1.25
Figure Error (channel channel connection
non-inverting input error amps channel channel internally connected VREF/2, therefore cannot configured inverting output. ch-1 Step Step down Inverting ch-2 ch-3
MB3782
USING
triangular waves, shown Figure oscillator frequency charging discharging capacitor connected using current value resistor connected pin. addition, when voltage level VREF/2 output external circuits from pin, care must taken making external circuit connections adjust fact that increased value current external circuits determining oscillator frequency (see Figure
Triangular wave oscillator VREF
VREF
Figure
VREF/2 connection external circuits from
Triangular wave generator VREF external circuits VREF
Figure
VREF/2 connection external circuits from
MB3782
TREATMENT UNUSED ERROR AMPS
error amps that used should handled follows. Note that failure apply proper treatment error amps will cause circuit activate disable switching regulator output.
Error (channel
VREF DTC1
Note: shoud left open.
Error (channel
VREF
DTC2
Note: shoud left open.
Error (channel
VREF DTC3
Note: shoud left open.
MB3782
TREATMENT UNUSED
When timer latch short protection circuit used, should connected shortest possible path.
ABSOLUTE MAXIMUM RATINGS
Parameter Power supply voltage Error input voltage Dead time control input voltage Control input voltage Collector output voltage Collector output current Allowable loss Operating temperature Storage temperature Symbol VCTL VOUT IOUT Tstg +25°C Condition Version Version Rating -0.3 -0.3 -0.3 740*2 1110 +25°C) Unit
operation conditions where +25°C, version should derated mW/°C, version should derated 11.1 mW/°C. When mounted cm-square dual-sided epoxy board. Note: Permanent device damage occur above 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.
MB3782
RECOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage Error input voltage Control input voltage Collector output voltage Collector output current Reference voltage output current Timing capacitance Timing resistance Oscillator frequency Operating temperature Symbol VCTL VOUT IOUT IREF fOSC Condition Value Min. 1.05 Typical Max. 18.0 1.45 15000 Unit
MB3782
ELECTRICAL CHARACTERISTICS
(VCC +25°C) Parameter Reference voltage Output voltage Output voltage temperature variation Input stability Load stability Short output current Threshold voltage Hysteresis width Reset voltage (VCC) Input threshold voltage Input standby voltage Input latch voltage Input source current Comparator threshold voltage Oscillator frequency Frequency deviation Frequency deviation (VCC) Frequency deviation (Ta) Input threshold voltage duty cyclet Input bias current Latch mode sink current Latch input voltage Symbol VREF VRTC Line Load VHYS VtPC VSTB Ibpc fOSC fdev Vt100 Ibdt pull-up pull-up 85°C Duty cycle Duty cycle VR/1.45 Conditions 85°C -0.1 -1mA VREF -0.1 -0.1 -0.1 Value Min. 2.45 0.60 -1.4 1.05 Typ. 2.50 ±0.2 2.72 2.60 0.65 -1.0 Max. 2.55 0.70 -0.6 2.25 Unit
Dead time controller (DTC)
Triangular wave Short circuit protection Undervoltage lock oscillator (SCP) circuit (UVLO)
(Continued)
MB3782
(Continued)
Parameter Input offset voltage Input offset current Input bias current Common mode input voltage range Error amps Voltage gain Frequency bandwidth Common mode rejection ratio Maximum output voltage range Output sink current Output source current comparator Input threshold voltage Input sink current Input source current Input conditions Input conditions Control current Output leak current Output saturation voltage Standby current Average feed current Symbol VICR CMRR VOM+ VOMIOM+ IOMVt0 Vt100 IIN+ IINVOFF ICTL Leak VSAT ICCS ICCa VCTL VOUT IOUT VCTL VCTL VCC, output load VOUT VOUT Duty cycle Duty cycle Conditions VOUT VOUT VOUT (VCC +25°C) Value Unit Typ. Max. -100 1.45 2.25
Min. -100 -500 1.05 VREF -0.3 1.05
Entire Output device block
Control block
Voltage control channel positive negative. non-inverting input error amps channel channel internally connected VREF/2, therefore voltage control positive only. VREF/2 output obtained from pin.
MB3782
TEST CIRCUIT
OUTPUT OUTPUT
TEST INPUT
TEST INPUT TEST INPUT OUTPUT
wavefoms
Short protection comparator reference input
Dead time,PWM input voltage Error output "High" "Low" "High" "Low" "High" "Low" Power Power
comparator output
Dead time
TIMING CHART (INTERMAL WAVEFORMS)
Output transistor-collector waveforms
waveforms
Short protection comparator output
Control voltage (VCTL: minimum value) Protection enable time (µs)
Power supply voltage (VCC: minimum)
MB3782
MB3782
EXAMPLE APPLICATION
VREF
DTC1
DTC2
DTC3
OUT1
(-5V)
0.033
3782
(+5V)
OUT2
0.033
OUT3
0.033
MB3782
TYPICAL CHARACTERISTICS CURVES
Power supply voltage vs.reference voltage Reference voltage VREF Power supply voltage vs.average feed current +25°C
+25°C
Power supply voltage Ambient temperature vs.reference voltage 2.51 2.50 2.49 2.48 2.47 2.46 2.45 Ambient temperature (°C) VCTL
Power supply voltage
Timing capacity vs.triangular wave maximum amplitude voltage +25°C
Reference voltage VREF
Timihg capacitance (pF)
Sink current vs.collector saturation voltage Collector saturation voltagre Error maximum output voltage amplitude +25°C
Frequency vs.error maximum output voltage amplitude +25°C
Sink current (mA)
Fequency (Hz)
(Continued)
MB3782
Timing resistance vs.oscillator frequency +25°C
Triangular wave period(µsec)
Power supply voltage vs.averege feed current +25°C
Oscillator frequency fOSC (Hz)
15000
1500 Timing capacitance (pF)
Timing resistance Ambient temperature vs.oscillator frequency
Frequency variation
Oscillator frequency vs.duty cycle
Duty Cycle
1330 +25°C
Oscillator frequency (Hz)
Ambient temperature (°C) Control voltage vs.reference voltage +25°C
Control current ICTL (µA)
Control input current +25°C
Reference voltage VREF
Control voltage VCTL
Control voltage VCTL
(Continued)
MB3782
Frequenncy vs.gain phase open
Frequenncy vs.gain phase 0.047
Phase (deg)
Frequenncy (Hz) Frequenncy vs.gain phase
Frequenncy (Hz) Frequenncy vs.gain phase 4700
Phase (deg)
Frequenncy (Hz) Test Circuit VREF VREF
Frequenncy (Hz)
Error
(Continued)
Phase (deg)
Gain (dB)
Gain (dB)
Phase (deg)
Gain (dB)
Gain (dB)
MB3782
(Continued)
Ambient temperature vs.allowable loss
Allowable loss (mW)
1200 1110 1000
version
version
Ambient temperature (°C)
MB3782
APPLICATIONS
Concerning Equivalent Series Resistance Stability Smoothing Capacitors
DC/DC converters, equivalent series resistance value (ESR) smoothing capacitors major influence loop phase characteristics. means which phase characteristics approximate phase relationships ideal capacitors highfrequency bands (see Graph 1-1), thus improving system stability. same time, smoothing capacitors with reduces system stability, that care must taken when using semiconductor electrolytic capacitors capacitors) tantalum capacitors with ESR.
Figure
Basic circuit step-down voltage DC/DC converter
Frequency vs.Gain
Frequency vs.phase
Phase (deg)
Gain (dB)
Frequency (Hz)
Frequency (Hz)
Graph
Frequency gain phase
MB3782
Reference data Changing smoothing capacitor from aluminum electrolytic capacitor 1.0) lower-ESR semiconductor electrolytic capacitor capacitor: decreases phase margin (see Graphs 1-2, 1-3).
phase characteristics measured between these points
VREF/2 Error
Figure
Measurement DC/DC Capacitor Phase Characteristics
Graph
DC/DC converter output frequency vs.gain phase
Gain (dB)
Phase (deg)
Aluminum electrolytic capacitor fosc
Frequency (Hz)
Graph
Gain (dB)
DC/DC converter output frequency vs.gain phase
Phase (deg)
capacitor fosc
Frequency (Hz)
MB3782
ORDERING INFORMATION
Part number MB3782P MB3782PF Package Plastic DIP, (DIP-20P-M01) Plastic SOP, (FPT-20P-M01) Remarks
MB3782
PACKAGE DIMENSIONS
Plastic (DIP-20P-M01)
24.64 -0.30 .970 -.012
+.008 +0.20
INDEX-1 INDEX-2 6.60±0.25 (.260±.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
0.86 .034 1.27(.050)
1.27
.050 2.54(.100)
7.62(.300)
15°MAX
Dimensions (inches)
1994 FUJITSU LIMITED D20005S-3C-3
(Continued)
MB3782
(Continued)
Plastic SOP, (FPT-20P-M01)
2.25(.089)MAX 12.70
+0.25 -0.20 +.010 -.008
.500
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
+0.05
0.50±0.20 (.020±.008)
Details part 0.20(.008)
0.10(.004) 11.43(.450)REF 0.50(.020) 0.18(.007)MAX 0.68(.027)MAX
1994 FUJITSU LIMITED F20003S-5C-4
Dimensions (inches)
MB3782
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

ASSP Power Supplies BIPOLAR Switching Regulator Controller

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