MB3782PF FUJITSU [Fujitsu Component Limited.], MB3782PF Datasheet
MB3782PF
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MB3782PF Summary of contents
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FUJITSU SEMICONDUCTOR DATA SHEET ASSP Power Supplies BIPOLAR Switching Regulator Controller MB3782 DESCRIPTION The FUJITSU MB3782 is a PWM-type switching regulator controller, designed with open-collector output for connection to external drive transistors and coils, providing a selection of three types ...
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MB3782 PIN ASSIGNMENT PIN DESCRIPTION Pin No. Pin Name 1 V REF +IN1 5 –IN1 6 FB1 7 DTC1 TOP VIEW REF CTL 19 ...
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Pin No. Pin Name 8 VOUT1 9 GND 10 OUT2 11 DTC2 FB2 13 –IN2 14 SCP OUT3 16 DTC3 FB3 18 –IN3 19 CTL *1: DTC = Dead Time ...
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MB3782 BLOCK DIAGRAM 1.25 V Triangular wave oscillator + IN1 4 – IN1 5 FB1 6 DTC1 7 – IN2 13 FB2 12 DTC2 11 – IN3 18 FB3 17 DTC3 16 SCP Comp. SCP 14 4 ...
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FUNCTIONAL DESCRIPTIONS 1. Reference Voltage Source The reference voltage source uses the voltage provided at the power supply pin (pin 20) to generate a temper- ature-compensated reference voltage ( 2.50 V), which is used as the operating power supply for ...
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MB3782 SETTING THE TIME CONSTANT FOR THE TIMER-LATCH TYPE SHORT PREVENTION CIRCUIT Figure 1 shows the configuration of the protection latch circuit. The output lines from the error amps are each connected to the inverting input lines of the short ...
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SETTING OUTPUT VOLTAGE The following diagrams show the connections used to set the output voltage. Because the power supply to the error amps is provided by the same reference voltage circuit used for the other internal circuits, the common-mode input ...
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MB3782 1.25 V Figure 4 Error amp (channel 2, channel 3) connection The non-inverting input to the error amps on channel 2 and channel 3 is internally connected to V therefore cannot be configured for inverting output. ch-1 Step up ...
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USING THE R PIN T The triangular waves, as shown in Figure 5, act to set the oscillator frequency by charging and discharging the capacitor connected to the C pin using the current value of the resistor connected to the ...
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MB3782 TREATMENT OF UNUSED ERROR AMPS Any error amps that are not used should be handled as follows. Note that failure to apply proper treatment to error amps will cause the SCP circuit to activate and disable the switching regulator ...
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TREATMENT OF UNUSED SCP PIN When the timer latch short protection circuit is not used, the SCP pin should be connected to the GND by the shortest possible path. SCP 14 MB3782 11 ...
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MB3782 ABSOLUTE MAXIMUM RATINGS Parameter Power supply voltage Error amp input voltage Dead time control input voltage Control input voltage Collector output voltage Collector output current Allowable loss Operating temperature Storage temperature *1: For operation in conditions where Ta > ...
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ELECTRICAL CHARACTERISTICS Parameter Symbol Output voltage Output voltage temperature variation Input stability Load stability Short output current Threshold voltage Hysteresis width Reset voltage ( Input threshold voltage Input standby voltage Input latch voltage Input source current Comparator threshold ...
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MB3782 (Continued) Parameter Input offset voltage Input offset current Input bias current Common mode input voltage range Voltage gain Frequency bandwidth Common mode rejection ratio Maximum output voltage range Output sink current Output source current Input threshold voltage Input sink ...
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TEST CIRCUIT 330 pF 150 k TEST INPUT OUTPUT OUTPUT 4 CTL TEST 5 16 INPUT TEST 10 11 ...
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MB3782 TIMING CHART (INTERMAL WAVEFORMS) 16 ...
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EXAMPLE OF APPLICATION MB3782 17 ...
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MB3782 TYPICAL CHARACTERISTICS CURVES Power supply voltage vs.reference voltage 5.0 2 Power supply voltage V Ambient temperature vs.reference voltage 2.51 2.50 2.49 2.48 2.47 2.46 2. Ambient temperature Ta (˚C) ...
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Timing resistance vs.oscillator frequency +25˚ 100 1500 15000 100 k Timing ...
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MB3782 Frequenncy vs.gain and phase 100 Frequenncy f (Hz) Frequenncy vs.gain and phase 100 Frequenncy f ...
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Ambient temperature vs.allowable loss DIP version 800 740 SOP version 600 400 200 Ambient temperature Ta (˚C) MB3782 21 ...
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MB3782 APPLICATIONS • Concerning Equivalent Series Resistance and Stability of Smoothing Capacitors In DC/DC converters, the equivalent series resistance value (ESR) of smoothing capacitors has a major influence on loop phase characteristics. The ESR is a means by which phase ...
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Reference data Changing the smoothing capacitor from an aluminum electrolytic capacitor (RC conductor electrolytic capacitor (OS capacitor – Error amp Figure 8 Measurement of DC/DC Capacitor AV and Phase ( ) Characteristics DC/DC converter ...
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... The worker must put on a grounding device containing 250 k • Do not apply a negative voltage - Applying a negative voltage of 0 less to an LSI may generate a parasitic transistor, resulting in malfunction. ORDERING INFORMATION Part number MB3782P MB3782PF resistors in series. Package Plastic DIP, 20 pin (DIP-20P-M01) Plastic SOP, 20 pin ...
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PACKAGE DIMENSIONS Plastic DIP , 20 pin (DIP-20P-M01) 24.64 .970 INDEX-1 INDEX-2 4.36(.172)MAX 3.00(.118)MIN +0.30 0.86 1.27 –0 +.012 .034 .050 –0 1.27(.050) 2.54(.100) MAX TYP 1994 FUJITSU LIMITED D20005S-3C-3 C +0.20 –0.30 +.008 –.012 6.60±0.25 (.260±.010) 0.51(.020)MIN 0.25±0.05 (.010±.002) ...
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MB3782 (Continued) Plastic SOP 20 pin (FPT-20P-M01) +0. 12.70 .500 –0.20 20 INDEX 1 1.27(.050) 0.10(.004) 0.10(.004) 2002 FUJITSU LIMITED F20003S-c-7 Note These dimensions include resin protrusion. Note These dimensions ...
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MB3782 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in ...