SWITCHING REGULATOR CONTROLLER MB3778 DESCRIPTION MB377

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SWITCHING REGULATOR CONTROLLER MB3778 DESCRIPTION MB377

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DS04-27203-5E
SWITCHING REGULATOR CONTROLLER
MB3778
DESCRIPTION
MB3778 dual switching regulator control basic circuit that controls system switching regulator power channels. Complete synchronization achieved using same oscillator output. This accept following types output voltage: step-down, step-up, voltage inversion (inverting voltage output only circuit). MB3778's power consumption makes ideal portable equipment.
FEATURES
Wide input voltage range: 3.6V current consumption: 1.7mA typ. operation, 10µA max. stand-by Wide oscillation frequency range: 1kHz 500kHz On-chip timer latched short-circuit sensing circuit Under-voltage lockout conditions On-chip 2.46V reference voltage circuit: 1.23V output obtained from terminal Variable dead-time provides control over total range On-ship stand-by function: power on/off function
PACKAGES
(DIP-16P-M04) (FPT-16P-M06)
MB3778
ASSIGNMENT
(TOP VIEW) +IN1 -IN1 D.T.C.1 OUT1 E/GND VREF -IN2 D.T.C.2 OUT2
ABSOLUTE MAXIMUM RATINGS (See NOTE)
25°C) Parameter Power Supply Voltage Error Amp. Input Voltage Control Input Voltage Collector Output Voltage Collector Output Current Power Dissipation Operating Temperature Storage Temperature Symbol VCTL VOUT IOUT Tstg Condition 25°C (SOP) 25°C (DIP) Rating -0.3 -0.3 *620 1000 +125 Unit
packages mounted epoxy board (4cm 1.5mm) 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.
MB3778
PIN/ASSIGNMENT
+IN1 -IN1 Function Oscillator timing capacitor (150 15,000pF). Oscillator timing resistor (5.1 100k). VREF also available this error amplifier reference input. Non-inverted input error amplifier Inverted input error amplifier Output error amplifier resistor capacitor connected between this terminal -IN1 terminal adjust gain frequency. OUT1 dead-time control. Dead-time control adjusted external resistive divider connected VREF pin. capacitor connected between this terminal enables soft-start operation. Open collector output. Output transistor common ground independent signal ground. This output source sink 50mA. Ground. Power (3.6 18V) Open collector output. Output transistor common ground independent signal ground. This output source sink 50mA. Sets dead-time OUT2. this terminal same that DTC1. Output terminal error amplifier Sets gain adjusts frequency when resistor capacitor connected between this terminal -IN2 terminal. Voltage VREF internally connected non-inverting input error amplifier error amplifier positive voltage output. Inverting input terminal error amplifier Power control terminal. stand-by state when this terminal pulled "Low". Current consumption 10µA lower stand state. input driven CMOS. Connects time constant setting capacitor timer latch short-circuit protection circuit. Connect capacitor between this GND. details, "How time constant timer latch short-circuit protective circuit". 2.46V reference voltage output terminal which source 1mA. This used reference input idle period error amplifiers.
DTC1
OUT1 E/GND OUT2
DTC2
-IN2
VREF
MB3778
BLOCK DIAGRAM
Figure
MB3778 Block Diagram
2.46V Reference Voltage 2.46V Error
1.23V Power Supply 1.9V 1.3V
Triangular Waveform
Comp
S.C.P. Comp
Comp
2.1V Error 2.46V
1.23V
U.V.L.O.
Latch
D.T.C. Comp
1.1V
RECOMMENDED OPERATING CONDITIONS
Value Parameter Power Supply Voltage Error Amp. Input Voltage Control Input Voltage Collector Output Voltage Collector Output Current Timing Capacitor Timing Resistor Oscillator Frequency Operating Temperature Symbol Min. VCTL VOUT IOUT fOSC 1.05 Typ. Max. 1.45 15000 Unit
MB3778
OPERATION DESCRIPTION
Reference voltage circuit
reference voltage circuit generates temperature-compensated reference voltage 2.46V) from (pin reference voltage used internal circuit. reference obtained from VREF terminal (pin 16).
Triangular wave oscillator
Triangular waveforms generated frequency connecting timing capacitor resistor terminal (pin terminal (pin amplitude this waveform from 1.3V 1.9V. These waveforms connected non-inverting inputs comparator output through terminal.
Error amplifiers (Error Amp.)
error amplifier detects output voltage switching regulator outputs control signals. in-phase input voltage range from 1.05V 1.45V. reference voltage obtained dividing reference voltage output (recommended value: VREF/2) voltage (1.23V) supplied non-inverting input. VREF/2 voltage internally connected non-inverting input other error amplifier. loop gain chosen connecting feedback resistor capacitor inverting input terminal from output terminal error amplifier. Stable phase compensation possible.
Timer latch short circuit protection circuit
This circuit detects output levels each error amplifier. output level both error amplifiers 2.1V higher, 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, 0.65V), latch circuit turns output drive transistor sets idle period 100%.
Under voltage Lock-out circuit
transition state power-on momentary power fluctuation cause control malfunction, which adversely affect even destory system. under voltage lockout circuit monitors with reference internal reference voltage resets latch circuit turn output drive transistor off. idle period 100%. also pulls protection enable terminal (pin "Low".
comparator unit
Each comparator inverting input non-inverting inputs. This voltage-to-pulse-width converter controls output pulse width according input voltage. comparator turns output drive transistor while triangular waveforms from oscillator lower than error amplifier output dead time control terminal voltage.
Output drive transistor
output drive transistors have open collector outputs with common source supply common grounds independent signal ground. output drive transistors sink source 50mA.
Power control unit
power control terminal (pin controls power on/off modes (the power supply current stand-by mode 10µA lower).
MB3778
ELECTRICAL CHARACTERISTICS
25°C,
Value Parameter
Reference Section Output Voltage Output Temp. Stability Input Stability Load Stability Short Circuit Output Current -1mA -30°C +85°C 3.6V -0.1mA -1mA VREF VREF VRTC Line Load 2.41 2.46 ±0.2 2.51
Condition
Symbol Min. Typ. Max.
Unit
Under Voltage Lockout Protection Section -0.1mA Threshold Voltage -0.1mA Hysteresis Width Reset Voltage (VCC) Protection Circuit Section Input Thresold Voltage Input Stand Voltage Input Latch Voltage Input Source Current Comparator Threshold Voltage pull pull VtPC VSTB Ibpc 0.60 -1.4 0.65 -1.0 -0.6 -0.1mA VHYS 2.60 2.72
Triangular Waveform Oscillator Section Oscillator Frequency Frequency Deviation Frequency Stability (VCC) Frequency Stability (TA) Dead-Time Control Section Input Threshold Voltage (fOSC 10kHz) Duty Cycle Input Bias Current Latch Mode Sink Current Latch Input Voltage 2.5V 100µA Duty Cycle Duty Cycle 100% VR/1.45V Vt100 1.05 2.25 330pF, 330pF, 3.6V -30°C +85°C fOSC fdev
MB3778
ELECTRICAL CHARACTERISTICS (Continued)
25°C,
Value Parameter
Error Amp. Section Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Range Voltage Gain Frequency Badn Width Common Mode Rejection Ratio 1.6V 1.6V 1.6V 3.6V 200k Max. Output Voltage Width Output Sink Current Output Source Current Comparator Section Input Threshold Voltage (fOSC 10kHz) Input Sink Current Input Source Current Control Section Input Condition Input Condition Control Terminal Current Output Section Output Leak Current Output Saturation Voltage Device Section Stand Current Average Supply Current VCTL VCTL VCC, Output Load ICCS ICCa 50mA Leak VSAT VCTL VOFF ICTL Duty Cycle Duty Cycle 100% 1.6V 1.6V Vt100 IIN+ IIN- 1.05 2.25 VOM- IOM+ IOM- VICR CMRR VOM+ -100 -500 1.05 VREF -0.3 -100 1.45
Condition
Symbol Min. Typ. Max.
Unit
MB3778
TEST CIRCUIT
Figure
TEST 4.7K OUTPUT 4.7K OUTPUT MB3778
MB3778 Test Circuit
INPUT
330pF
TEST INPUT
TIMING CHART (Internal Waveform)
Triangular waveform oscillator output Short circuit protection comparator Reference 2.1V 1.9V input 1.6V Dead Time input 1.3V voltage Error Amp. output comparator output Output Transistor collector waveform S.C.P. Terminal waveform Short circuit protection comparator output Control Terminal voltage "High" "Low" "High" "Low" 0.6V "High" "Low" Power "ON" 2.1V (CCTL Min. Value) 2.1V 3.6V Protection Enable Time (µs) (CCC Min. Value) Power "OFF" DEAD TIME 100%
Figure
MB3778 Timing Chart
Power supply voltage
MB3778
APPLICATION CIRCUIT
Figure
820pF 8.2k 1.8k 4.7k 4.7k 4.7k 0.003 2.4k 5.6k 120µH 9.1k (-5V) 120µH MB3778 220µF 1.8k 0.003 56µH 0.1µF
Chopper Type Step Down/Inverting
(10V)
220µF
220µF (5V)
Figure
820pF 8.2k 1.8k 4.7k 4.7k 4.7k 0.003 2.4k
Chopper Type Step Up/Inverting
0.1µF MB3778 1.6k 220µF 1.8k 0.003 (5V)
56µH
120µH 120µH (5V)
9.1k (-5V)
220µF
220µF
MB3778
APPLICATION CIRCUIT (Continued)
Figure
820pF 8.2k MB3778 150k 4.7k 1.8k 1000pF 5.6k 1.8k 0.003 0.1µF 56µH
Multi Output Type (Apply Transformer)
(10V)
220µF
220µF
220µF
220µF
220µF
V02- (-12V)
V01- (-5V)
V02+ (5V)
V01+ (12V)
MB3778
OUTPUT VOLTAGE
output voltage using connections shown Fig. error amplifiers power supplied reference voltage circuit other internal circuits. inphase voltage range from 1.05V 1.45V. 1.23V (VREF/2) reference input voltage that connected either inverting non-inverting input terminals.
Figure
Connection Error Amp. Output Voltage
VREF
VREF
Figure
Connection Error Amp. Output Voltage
VREF VREF VREF
MB3778
TIME CONSTANT TIMER LATCH SHORT-CIRCUIT PROTECTION CIRCUIT
Fig. shows configuration protection latch circuit. Each error amplifier outputs connected inverting inputs short-circuit protection comparator compared with reference voltage (2.1V) connected non-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 held about 50mV. load changes drastically load short-circuit inverting inputs short-circuit protection comparator above 2.1V, short-circuit protection comparator output goes "Low" turn transistor protection enable terminal voltage discharged, then short-circuit protection comparator charges protection enable capacitor according following formula: 50mV 10-6/CPE 0.65 50mV 10-6/CPE tPE/0.6 (µF) When protection enable capacitor charges about 0.65V, protection latch enable under voltage lockout circuit output drive transistor turned off. idle period also 100%. Once under voltage lockout circuit enabled, protection enable released; however, protection latch reset power turned off. non-inverting inputs D.T.C. comparator (pin compared reference voltage (about 1.8V) connected non-inverting input. prevent malfunction short-circuit protection-circuit under soft-start operation D.T.C. comparator outputs "High" level until D.T.C. terminal voltage reaches about 1.1V, then closes protection enable terminal turning transistor
Figure
Protection Latch Circuit
2.46V
S.C.P. Comp. Error Amp. Error Amp. 2.1V
U.V.L.O.
Latch
D.T.C. Comp. 1.1V
D.T.C.1 D.T.C.2
MB3778
SYNCHRONIZATION
synchronize MB3778 ICs, specified capacitor resistor connected terminals master terminals (pin slave connected VREF terminal (pin disable charge/discharge circuit triangular wave oscillation. terminals master slave connected together.
Figure
Connection Master, Slave
MB3778 (MASTER)
MB3778 (SLAVE)
MB3778 (SLAVE)
MB3778
TYPICAL PERFORMANCE CHARACTERISTICS
Figure
Reference voltage VREF
Power supply voltage Reference voltage
Figure
Average supply current ICCa (mA)
Power supply voltage Average supply current
TA=25°C
TA=25°C
Power supply voltage
Power supply voltage
Figure
2.47 Reference voltage VREF 2.46 2.45 2.44 2.43 2.42 2.41 2.40
Reference voltage Temp
Figure
Triangular waveform Max. Amplitude voltage
Timing capacitor Triangular waveform Max. Amplitude voltage
VCC=6V RT=15k TA=25°C
VCC=VCTL=6V IOR=-1mA
Timing capacitor (pF)
Figure
Collector saturation voltage VREF
Temp (°C) Collector saturation voltage Sink Current Error Amp. Max. output voltage VCC=6V TA=25°C
Figure
Error Amp. Max. output voltage Frequency
VCC=6V TA=25°C
100k Frequency (Hz)
500k
Sink current (mA)
MB3778
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Figure Timing resistor Oscillation frequency
Triangular waveform cycle (µsec) VCC=6V TA=25°C VCC=6V RT=15k TA=25°C
Figure
Triangular waveform cycle Timing capacitor
Timing resistor fOSC (Hz)
100k
CT=150pF
CT=1500pF
Timing capacitor (pF)
CT=15000pF 100k Timing resistor 500M
Figure
Frequency stability
Temp. Oscillation frequency
VCC=6V CT=330pF RT=15k
Figure
Suty
Oscillation frequency Duty
VCC=6V CT=330pF RT=15k TA=25°C 100k Oscillation frequency (Hz) 500k
Temp (°C)
Figure
Control voltage Reference voltage
VCC=6V TA=25°C Control current ICTL (µA)
Figure
Control input current
VCC=6V TA=25°C
Reference voltage VREF
Control voltage VCTL
Control voltage ICTL
MB3778
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Figure Frequency Gain/Phase
CNF=OPEN
Figure
Frequency Gain/Phase (Actual Data)
CNF=0.047µF
Phase (deg)
Frequency (Hz) 100k
-180
Frequency (Hz) 100k
-180
Figure Frequency Gain/Phase (Actual Data)
CNF=470pF
Figure
Frequency Gain/Phase (Actual Data)
CNF=4700pF
Phase (deg)
Gain (dB)
Gain (dB)
Frequency (Hz) 100k
-180
Frequency (Hz) 100k
-180
Figure
Actual Circuit
VREF VREF
4.7k 10µF 4.7k
4.7k 240k
4.7k
Error Amp.
Phase (deg)
Phase (deg)
Gain (dB)
Gain (dB)
MB3778
APPLICATION
Equivalent series resistance stability smoothing capacitor
equivalent series resistance (ESR) smoothing capacitor DC/DC converter greatly affects loop phase characteristic. smoothing capacitor with high improves system stability because phase advanced into highfrequency range ideal capacitor (see Fig. 30). smoothing capacitor with reduces system stability. care when using electrolytic capacitors capacitors) tantalum capacitors.
Figure
DC/DC Converter Basic Circuit
Figure
Gain Frequency
Figure
Phase Frequency
Phase (deg)
Gain (dB)
(1): (2): Frequency f(Hz) 100k -180
(1): (2):
Frequency f(Hz)
100k
MB3778
Reference data aluminum electrolytic smoothing capacitor 1.0) replaced with electrolytic capacitor capacitor: 0.2), phase margin reduced half (see Fig. 33).
Figure
DC/DC Converter characteristic Test Circuit
VOUT
characteristic Between this point
VREF/2 Error Amp.
Figure
Gain (dB)
DC/DC Converter output Gain Phase
VCC=10V RL=25 CP=0.1µF
Phase (deg)
Condenser 220µF (16V) RC1.0 fOSC=1kHz
Frequency (Hz)
-180 100k
Figure
Gain (dB)
DC/DC Converter output Gain Phase
VCC=10V RL=25 CP=0.1µF
Phase (deg)
Condenser 22µF (16V) RC0.2 fOSC=1kHz
Frequency (Hz)
-180 100k
MB3778
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)
MB3778
(Continued)
pin, Plastic (FPT-16P-M06)
2.25(.089)MAX 10.15 -0.20 .400 -.008
+0.25 +.010
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)
MB3778
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
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F9803 FUJITSU LIMITED Printed Japan

SWITCHING REGULATOR CONTROLLER MB3778 DESCRIPTION MB377

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