SWITCHING REGULATOR CONTROLLER MB3775 VOLTAGE DUAL SWITCHING

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SWITCHING REGULATOR CONTROLLER MB3775 VOLTAGE DUAL SWITCHING

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DS04-27204-3E
SWITCHING REGULATOR CONTROLLER
MB3775
VOLTAGE DUAL SWITCHING REGULATOR CONTROLLER
MB3775 dual pulse-width-modulation control circuit. contains basic circuits required control circuits. Complete synchronization obtained using same oscillator output waveform. This provide following types output voltage: step down, step inverter. Power consumption low, thus MB3775 ideal highefficiency portable equipment.
(DIP-16P-M04)
Wide supply voltage range: current consumption: typical Wide oscillation frequency range: On-chip timer latch short protection circuit On-chip under voltage lockout protection On-chip reference voltage: 1.28 Variable dead time provides control over total operating range. 25°C) Value -0.3 °C(SOP) Power Dissipation Tstg °C(DIP) 25°C(VSOP) *620 1000 *430 Unit
(FPT-16P-M06)
ABSOLUTE MAXIMUM RATINGS (see NOTE)
Rating Power Supply Voltage Error Amp. Input Voltage Collector Output Voltage Collector Output Current Symbol Condition
(FPT-16P-M05) ASSIGNMENT (TOP VIEW)
+IN1 -IN1 D.T.C.1 OUT1 E/GND
Operating Temperature Storage temperature
to+125
packages mounted epoxy board 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.
VREF +IN2 -IN2 D.T.C.2 OUT2
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.
MB3775
BLOCK DIAGRAM
1.9V 1.3V
VREF=1.28V
Reference Voltage 2.5V
Triangular Waveform Comp Comp
Error
S.C.P. Comp
1.1V 2.5V U.V.L.O. D.T.C. Comp 1.8V
Error
1.28V 0.9V 0.9V
Latch
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol fOSC IREF Value -0.2 1.45 15000 Unit
Power Supply Voltage Error Amp. Input Voltage Collector Output Voltage Collector Output Current Phase Compensation Capacitor Timing Capacitor Timing Resistor Oscillator Frequency Reference Voltage Output Current Operating Temperature
MB3775
OPERATION DESCRIPTION
Reference voltage
reference voltage circuit generates stable, temperature-compensated reference from (pin internal circuits. reference voltage temperature compensated Vref obtained external circuit Vref terminal (pin 16).
Oscillator
triangular waveform frequency obtained connecting external capacitor resistor (pin terminals (pin amplitude this waveform from oscillator internally connected non-inverting inputs comparators. oscillator waveform available terminal.
Error amplifiers
error amplifier detects output voltage switching regulator. common-mode input voltage range -0.2 1.45 input reference voltage VREF levels. Error amplifiers used either inverting non-inverting amplifiers. voltage gain fixed. Phase compensation possible connecting capacitor terminals (pins error amplifiers. error amplifier output internally connected inverting inputs comparators also short protection circuit.
Timer latch short protection circuit
timer latch short protection circuit detects output levels error amplifiers. both error amplifier outputs lower, timer circuit begins charging externally connected protection enable capacitor. output level error amplifier does drop below normal voltage range before capacitor voltage reaches transistor base-emitter voltage 0.65 latch circuit turns output drive transistor sets dead time
Under voltage lockout protection circuit
ambiguous transition state power-on momentary fluctuation supply line result loss control adversely affect even destroy system. under voltage lockout protection circuit compares internal reference voltage level with supply voltage level. supply voltage level falls below reference level latch circuit reset output drive transistor turned dead time protection enable terminal (pin pulled "Low".
comparator
Each comparator inverting inputs non-inverting input. This voltage-to-pulse-width converter controls output pulse width according input voltage. comparator turns output drive transistor when oscillator triangular waveform higher than error amplifier output dead time control terminal voltage.
Output drive transistor
open-collector output-drive transistors provide common-emitter output dielectric capability. output drive transistors source drive current switching power transistor.
MB3775
ELECTRICAL CHARACTERISTICS
(Ta=25°C, VCC=6V) Parameter condition Symbol Value Unit
Reference Section
Output Voltage Output Temp. Stability Input Stability Load Stability Short Circuit Output Current
Under Voltage Lockout Protection Section
-0.1 VREF
VREF VRTC Line Load
1.26
1.28 ±0.2
1.30
Threshold Voltage Hysteresis Width Reset Voltage (VCC)
Protection Circuit Section
-0.1 -0.1 -0.1
VHYS
2.72 2.60
Input Threshold Voltage Input Stand Voltage Input Latch Voltage Input Source Current Comparator Threshold Voltage
Triangular Waveform Oscillator Section
VtPC
0.60
0.65 -1.0
-0.6
pull pull
VSTB Ibpc
-1.4
Ocillator Frequency Frequency Deviation Frequency Stability (VCC) Frequency Stability (Ta)
Dead-Time Control Section
fOSC fdev
Input Threshold Voltage (fOSC kHz) Input Bias Current Latch Mode Source Current Latch Input Voltage
Duty Cycle Duty Cycle
Vt100 Ibdt
-0.2 -150
VREF -0.15
VREF -0.1
Idt=-40
MB3775
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25°C, VCC=6V) Parameter Condition Symbol Value Unit
Error Amp. Section
Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Range Voltage Gain Frequency Band Width Common Mode Rejection Ratio Max. Output Voltage Width Output Sink Current Output Source Current
Comparator Section
VCC=3.6V
VICR
-100 -500 -0.2
-100 -1.2
+100 +1.45 -0.7
CMRR VOM+ VOM-
IOM+ IOM-
Input Threshold Voltage (fOSC=10 kHz) Input Sink Current Input Source Current
Output Section
Duty Cycle Duty Cycle
Vt100 IIN+ IIN-
1.05
-1.2
-0.7
Output Leak Current Output Saturation Voltage
VO=18V IO=50
Leak VSAT
Stand Current Average Supply Current
Output "OFF" RT=15k
ICCS ICCa
MB3775
TEST CIRCUIT
INPUT TEST 4.7k VCC=6V
OUTPUT 4.7k OUTPUT
MB3775 330pF
TEST INPUT
TIMING CHART (Internal Waveform)
Error Amp. output Triangular waveform osillator output 1.9V Dead Time 1.5V input voltage 1.3V Short circuit protection 1.1V comparator Reference input "High" comparator output "Low" Output Transistor collector waveform S.C.P Terminal waveform "High" "Low" 0.6V
LOCK-OUT
DEAD TIME 100%
Short circuit protection "High" comparator output "Low" LOCK-OUT CANCEL Power supply voltage 3.6V (VCC Min. Value) Protection Enable Time (sec) (Typ. Value)
MB3775
APPLICATION CIRCUIT
Fig. Chopper Type Step Down/Inverting (10V) 820pF 2.3k 5.6k 120µH 9.1k (-5V) Fig. Chopper Type Step Up/Inverting (5V) 820pF 2.3k 3.9k 120µH 9.1k (-5V) (+12V) 120µH 0.1µF MB3775 1.9k 0.1µF 56µH 0.1µF 120µH 0.1µF MB3775 1.9k 0.1µF 0.1µF 56µH
220µF
220µF
220µF (+5V)
220µF
220µF
220µF
MB3775
APPLICATION CIRCUIT (Continued)
Fig. Chopper Type Step Up/Inverting (For High Speed) 820pF 2.3k 120µH 9.1k (-5V) (+12V) 330pF 120µH 0.1µF 220µF MB3775 0.1µF 1.9k 56µH 0.1µF (5V)
220µF
220µF
Fig. Multi Output Type (Apply Transformer) 820pF MB3775 0.1µF 1.8k 1.9k 0.1µF 5.6K 0.1µF 56µH (10V)
220µF
220µF
220µF
220µF
220µF
V02(-12V)
V01(-5V)
V02+ (+5V)
V01+ (+12V)
MB3775
OUTPUT VOLTAGE
output voltage using connection shown Fig. error amplifiers supplied internal reference voltage circuit other internal circuits. common-mode input voltage range from -0.2 +1.45 When amplifiers operated non-inverting, inverting terminal VREF operated inverting, non-inverting terminal ground.
Fig. -Connection Error Amp. Output Voltage plus [V0+ VREF R2/R1)]
1.28 When amplifiers
VREF
Fig. -Connection Error Amp. Output Voltage minus [V0- -VREF (R2/R1)]
VREF
MB3775
TIME CONSTANT TIMER LATCH SHORT PROTECTION CIRCUIT
TIMING CHART shows configuration protection latch circuit. Error amplifier outputs, internally connected non-inverting inputs short-circuit protection comparator compared with reference voltage (1.1 connected inverting input. When load condition switching regulator stable, error amplifier output fluctuation. Thus, short-circuit protection control also kept balance, protection enable terminal (pin voltage kept about load condition drastically changes load short-circuit low-level signals (1.1 lower) input noninverting inputs short-circuit protection comparator from error amplifiers, short-circuit protection comparator outputs "Low" level turn transistor off. protection enable terminal voltage discharged, then short-circuit protection comparator charges externally connected protection enable capacitor according following formula: 10-6/CPE 0.65 10-6/CPE tPE/0.6 (µF) When protection enable capacitor charges about 0.65 protection latch enable under voltage lockout protection circuit turn output drive transistor off. dead time Once under voltage lockout protection circuit enabled, protection enable released; however, protection latch reset power turned off. non-inverting inputs D.T.C. comparator connected D.T.C. terminals (pins through power supply (about compared with reference voltage (about connected inverting input. prevent malfunction short protection circuit soft-start mode (using D.T.C. terminals), D.T.C. comparator outputs "High" level turn until D.T.C. terminal voltage drops about
Fig. Protection Latch Circuit
2.5V S.C.P.Comp. Error Amp.1 Error Amp.2 1.1V U.V.L.O.
Latch
D.T.C.Comp. 1.8V
0.9V 0.9V
D.T.C.1 D.T.C.2
MB3775
SYNCHRONIZATION
synchronize MB3775 ICs, first, specified capacitor resistor connected terminals master start self oscillation. Next, applied terminals slave disable charge/discharge circuit triangular wave oscillation. Finally, terminals master slave connected. Instead applying terminals, these terminals pulled resistor (see resistance indicated dashed line Fig. Select pull-up resistance Rpull from formula given below.
Rpull
Rpull: Pull Resistor VCC: Power Supply Voltage Number Slave
Fig. Connection Master, Slave
MB3775 (MASTER)
Rpull
MB3775 (SLAVE)
MB3775 (SLAVE)
MB3775
TYPICAL PERFORMANCE CHARACTERISTICS
Fig. Power supply voltage Reference voltage
Fig. Power supply voltage Average supply current Average supply current (mA) Power supply voltage
Reference voltage VREF(V)
Power supply voltage
Fig. Power supply voltage Stand current
Fig. Reference voltage Temp. 1.29
Reference voltage VREF Power supply voltage Error output voltage
Stand current ICCS (mA)
1.28
1.27
1.26
1.25
Temp. (5C)
Fig. Collector saturation voltage Sink current
Fig. Error Amp. Max. output voltage Frequency
Collector saturation voltage VSAT
Sink current (mA)
100K Frequency f(Hz)
MB3775
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. Timing resistor Oscillation Frequency
Triangular waveform cycle µsec) Fig. Triangular waveform cycle Timing capacitor
Timing resistor fOSC (Hz)
100k
CT=150pF
Timing resistance=15k VCC=6V
CT=1500pF
CT=15000pF 100K Timing resistor Timing resistance=15k VCC=6V 10-1 Timing capacitor (pF)
Fig. Timing capacitor Triangular waveform Max. Amplitude voltage
Fig. Frequency Gain/Phase
Gain Phase (deg)
Triangular waveform Max. Amplitude voltage
Gain AV(dB)
Phase
-180
Timing capacitor (pF) CFB=1µF
100K Frequency f(Hz)
Fig. Frequency Gain/Phase (Actual Data)
Fig. Frequency Gain/Phase (Actual Data)
CFB=0.1µF
Gain V(dB)
Phase (deg)
Gain AV(dB)
Gain Phase
Gain Phase
-180
-180
Frequency f(Hz)
Frequency f(Hz)
Phase (deg)
MB3775
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. Frequency Gain/Phase (Actual Data) CFB=0.01µF
Gain (dB)
Gain Phase
-180
Frequency f(Hz)
Phase (deg)
MB3775
APPLICATION
error amplifier frequency characteristic
Figure shows equivalent circuit error amplifier. frequency characteristic error amplifier high-frequency gain ratio resistors dB). (set value When gain about roll-off frequency adjusted changing external phase compensating capacitor (see Fig. 24). When high frequency gain needed phase must advanced frequency, connect resistor between terminal shown Figure (see Fig. 25).
Fig. Error Amp. Equivalent Circuit Error Amp.
COMP
[FB]
Fig. Error Amp. Equivalent Circuit (Insert Error Amp.
COMP
[FB]
NOTE: shown above, frequency characteristic error amplifier external phase compensating capacitor When ceramic chip capacitor must used meet requirements small system, careful temperature characteristic. (-30 frequency characteristic, sufficient phase margin must allowed room temperature.) Ceramic chip capacitors with temperature characteristic characteristic) film capacitors recommended (see Fig. 28).
MB3775
Fig. Error Amp. Frequency characteristics
(Large) (Small) (Small) Phase (deg) Phase (deg) CP=0.1µF
Gain (dB)
(Large)
CP=0.1µF -180
100k
100M
Frequency f(Hz)
Fig. Error Amp. Frequency characteristics
CP=0.1µF
Gain (dB) RP=0 (Large) (Large)
RP=0
-180
100k
100M
Frequency f(Hz)
MB3775
Fig. Ceramic Chip Capacitor (0.1
Temp. characteristic Temp. Ratio -30°C 0.19 25°C 80°C 0.32 -30°C 80°C 25°C Frequency f(Hz) 100K
Phase (deg) -30°C 25°C 80°C Phase (deg) Phase (deg)
Gain (dB)
Fig. Tantal Capacitor (0.33
Temp. characteristic Temp. Ratio -30°C 0.95 1.05 25°C 80°C 0.95 1.05 -30°C 25°C 80°C -30°C 80°C Frequency f(Hz) 100K 25°C
Gain (dB)
Fig. Film Capacitor (0.1
Temp. characteristic -30°C 25°C 80°C
Gain (dB)
-30°C, 25°C, 80°C
-30°C, 25°C 80°C Frequency f(Hz) 100K
MB3775
Effect equivalent series resistance smoothing capacitor
equivalent series resistance (ESR) smoothing capacitor DC/DC converter greatly affects loop phase characteristic. smoothing capacitor with reduces system stability increasing phase shift high-frequency region (see Fig. 30). Therefore, smoothing capacitor with high will improve system stability. careful when using semiconductor electrolytic capacitors (OS-CON) tantalum capacitors.
Fig. Step Down DC/DC Converter Basic Circuit
Fig. Gain Frequency
Fig. Phase Frequency
Gain (dB)
Phase (deg)
RC=0 RC=31m Frequency f(Hz) 100K
RC=0 RC=31m -180 Frequency f(Hz)
100K
MB3775
Reference data aluminum electrolytic smoothing capacitor 1.0) replaced with semiconductor electrolytic capacitor (OS-CON: phase shift reduced half (see Fig. 34).
Fig. DC/DC Converter characteristic Test Circuit VOUT
characteristic Between this point. 0.1µF VREF Error Amp.
Fig. DC/DC Converter output Gain (dB) VCC=10V RL=25 CP=0.1µF Phase (deg) Capacitor 22µF(16V) fosc=1kHz
-180 Frequency f(Hz) 100K
Fig. DC/DC Converter output Gain (dB) VCC=10V RL=25 P=0.1µF Phase (deg) OS-CON 220µF(16V) fosc=1KHz
-180 Frequency f(Hz) 100K
MB3775
Measures ensuring system stability when smoothing capacitor used
When smoothing capacitor used DC/DC converter, only apparent even high-frequency region, phase delayed almost 1805. Consequently, system phase margin stability reduced. other hand, capacitor needed reduce amount output ripple. This contrary system stability explained above. solve this problem, phase compensation used. This method increases phase margin advancing phase when phase margin reduced capacitor. three suggestions listed below recommended DC/DC converters using MB3775. shown Fig. capacitor connected parallel with output feedback resistor advance phase. formula below guideline capacitance.
2fR2 Unstable Frequency (See Fig.
Fig. External circuit example1 advance phase
VREF
Fig. DC/DC Converter output
Phase (deg)
Gain (dB)
VCC=10V RL=25 CP=0.1µF Smoothing Capacitor 22µF OS-CON C1=4700pF R1=1.8k R2=5.6 Frequency f(Hz)
-180 100K
MB3775
Measures ensuring system stability when smoothing capacitor used (Continued)
shown Figure resistor (RP) connected between terminal error amplifier advance phase. more increased, more phase advanced. However, gain high-frequency range also increased, which causes instability. Therefore, select optimum resistance (see Fig. 38).
Fig. External circuit example advance phase VREF
Fig. DC/DC Converter output
Gain (dB) VCC=10V L=25 P=0.1µF Smoothing Capacitor 22µF OS-CON P=470 1=1.8k 2=5.6 Frequency f(Hz)
Phase (deg)
-180 100K
MB3775
shown Fig. phase advanced using both example (Fig. 37).
Fig. External circuit example advance phase
VREF
Error amplifier input ripple voltage
boost circuit charging phase compensating capacitor connected error amplifier shown Figure protect against output voltage overload power-on. offset voltage provided negative input side that boost circuit only operates power-on. When capacitor connected parallel with output feedback resistor, because output ripple large advanced phase compensation, boost circuit starts operating, which degrade regulation differential input voltage error amplifier exceeds careful with differential input voltage error amplifier.
Fig. Error Amp. /Boost Equivalent circuit
Advanced phase compensation capacitor Boost circuit
15mV [FB] VREF Error Amp.
MB3775
PACKAGE DIMENSIONS
pins, 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 1.27(.050)
1.52
.039
.060 2.54(.100)
7.62(.300)
15°MAX
1994 FUJITSU LIMITED D16033S-2C-3
Dimensions (inches).
pins, Plastic (FPT-16P-M06)
10.15 -0.20 .400 -.008
+0.25 +.010
2.25(.089)MAX 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).
MB3775
pins, Plastic (FPT-16P-M05)
5.00±0.10(.197±.004)
1.25 -0.10 +.008 .049 -.004
+0.20
0.10(.004)
INDEX
*4.40±0.10
(.173±.004)
6.40±0.20 (.252±.008)
5.40(.213)
0.65±0.12 (.0256±.0047)
0.22 -0.05 +.004 .009 -.002
+0.10
0.15 -0.02 +.002 .006 -.001
+0.05
Details part 0.10±0.10(.004±.004) (STAND OFF)
4.55(.179)REF
0.50±0.20 (.020±.008)
1994 FUJITSU LIMITED F16013S-2C-4
Dimensions (inches).
MB3775
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 MB3775 VOLTAGE DUAL SWITCHING

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