MB3759 Fujitsu, MB3759 Datasheet
MB3759
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MB3759 Summary of contents
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... Switching Regulator Controller (Switchable between push-pull and single-end functions) MB3759 DESCRIPTION The MB3759 is a control IC for constant-frequency pulse width modulated switching regulators. The IC contains most of the functions required for switching regulator control circuits. This reduces both the component count and assembly work. FEATURES • ...
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... MB3759 PIN ASSIGNMENT BLOCK DIAGRAM 0.2 V Dead time DT 4 control Error amp.1 1 IN1 2 IN1 IN2 16 IN2 15 Error amp Feed back 2 (TOP VIEW) IN1 1 16 IN2 IN1 2 15 IN2 REF GND DIP-16P-M04 ( ) FPT-16P-M06 ( ) Output control OSC PMW comparator Reference 14 V REF regurator ...
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... Top — Tstg — Value Min — 0 — SINK I — SOURCE I — REF R 1 470 1000 T fosc 1 Top 30 MB3759 Unit Rating Max Min — — — 250 mA — — 1000 mW — 620 125 C Unit Typ Max — — 200 ...
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... MB3759 ELECTRICAL CHARACTERISTICS Parameter Output voltage Input regulation Load regulation Reference Temperature stability section Short circuit output current Reference lockout voltage Reference hysteresis voltage Oscillator frequency Standard deviation of frequency Oscillator section Frequency change with voltage Frequency change with temperature Input bias current ...
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... SINK O (pin3 (pin4 I See “ TEST — CC CIRCUIT” (pin6 REF I — CCQ I/O open — — — — MB3759 ° + Value Unit Typ Max 250 nA 0.2 1.0 A — — dB 800 — kHz 80 — dB 0.7 — — mA — 100 A — 100 A 1 ...
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... MB3759 TEST CIRCUIT TEST INPUT OPERATING TIMING = 3 Voltage OUTPUT 1 OUTPUT 15V CC 150 /2 W 150 1000 pF IN1 IN1 IN2 V IN2 REF OC GND OUTPUT 1 OUTPUT ...
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... OSCILLATION FREQUENCY f = OSC OUTPUT LOGIC TABLE Input (Output Control) GND V REF 1.2 · µF T fosc : kH Z Output State Single-ended or parallel output Push-pull MB3759 7 ...
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... MB3759 TYPICAL CHARACTERISTICS Reference voltage vs. power supply voltage REF 4 V REF Power supply voltage V Oscillator vs 500 k 200 k 100 0. 0 Reference voltages. temperature (V) CC Duty ratio vs. dead time control voltage , = 470 pF T 1000 100 k 200 k 500 100 Temperature Ta (° 1000 + + Dead time control voltage V ...
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... Collector output current I (mA) C Output voltage vs. output current (feed back terminal) 0 +70˚C 0 + + Output current I Emitter saturation voltage vs. emitter output current 1.8 1.6 1 +70 C 1.2 1 200 Emitter output current I MB3759 + 1.0 1 (mA +25 C 100 150 200 (mA) ...
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... MB3759 (Continued) Output voltage vs. reference voltage 400 OUT Reference voltage V Power dissipation vs. power supply voltage 1000 Ta = +25 C 800 600 400 200 Power supply voltage V 10 Power supply current vs. power supply voltage 10 7 (V) REF Power dissipation vs. ambient temperature ( 1000 (mA) (200, 10) ...
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... The theoretical conversion efficiency is 100%. In practice, losses occur in the switching element and elsewhere, and design decisions to minimize these losses include making the switching frequency as low as practical and setting an optimum ratio of input to output voltage. is supplied to the LC circuit and when Q is off, the energy stored OFF 100 MB3759 ...
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... MB3759 SWITCHING ELEMENT 1. Selection of the Switching Transistor It can be said that the success or otherwise of a switching regulator is determined by the choice of switching transistor. Typically, the following parameters are considered in selecting a transistor. • Withstand voltage • Current • Power • Speed For the withstand voltage, current, and power necessary to determine that the area of safe operation (ASO) of the intended transistor covers the intended range for these parameters ...
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... As a rule for diode selection, use a diode with a reverse recovery time 2SC3058A (450 +25˚ max. Single pulse C (Pulse max 0.5 0.2 0 100 200 500 1000 Collector - emitter voltage V (V) CE that is sufficiently faster than the transistor rr MB3759 13 ...
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... MB3759 APPLICATION IN PRACTICAL CIRCUITS 1. Error Amplifier Gain Adjustment Take care that the bias current does not become large when connecting an external circuit to the FB pin (pin 3) for adjusting the amplifier gain. As the FB pin is biased to the low level by a sink current, the duty cycle of the output signal will be affected if the current from the external circuit is greater than the amplifier can sink ...
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... If you wish to use both dead-time and softstart, combine these configuration. 4. Output Current Limiting (Fallback system using a detection resistor inserted on the output side) (1) Typical example V REF REF R1+ Incorporating soft start V REF GND MB3759 V REF DT pin causing the output REF ...
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... MB3759 • Initial limit current I L1 The condition for V is the diode is reverse biased the input offset voltage to the op-amp (- for example the variation the offset voltage gives the following This indicates a setting of 100 mV or more is required. • Polarity change point I ...
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... – this case, a current flows into the reference voltage source via R3 and the reference voltage, design the circuit such that this does not exceed 200 µ GND GND (R2 V – REF MB3759 V > < > R1) > maintain the stability O REF 17 ...
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... MB3759 (3) When an external stabilized negative power supply is presen The output current I after current limiting is – the output is momentarily shorted, V 300 mV or less to ensure that a voltage of less than -0 not applied to the op-amp input >> (R2 R1 goes briefly negative. In this case, set the voltage across R1 to ...
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... Example Protection Circuit for Output Transistor Due to its monolithic IC characteristics, applying a negative voltage greater than the diode voltage ( : = 0 the substrate (pin 7) of the MB3759 causes a parasitic effect in the IC which can result in misoperation. Accordingly, the following measures are required if driving a transformer or similar directly from the output transistor of the IC ...
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... MB3759 (2) Provide a bias at the anode-side of the diode to clamp the low level side of the transistor. (3) Drive the transformer via a buffer transistor 7 0.7 V 0.1 µF 1 ...
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... Typical Application (1)Chopper regulator 1 AC 100 100 k 0. 5 IN1 C 1 IN1 REF 5.6 k IN2 R T IN2 GND 2200 pF 300 MB3759 + 2200 F 0.1 21 ...
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... MB3759 (2) Inverter regulator AC 100 100 k 0.22 µF 2 µ 5.1 k 5.1 k 300 100 100 IN1 C 1 IN1 REF 2 IN2 R T IN2 GND 2200 pF REF 2 2200 F 0.1 B ...
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... ORDERING INFORMATION Part number MB3759P MB3759PF Package 16-pin plastic DIP (DIP-16P-M04) 16-pin plastic SOP (FPT-16P-M06) MB3759 Remarks 23 ...
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... MB3759 PACKAGE DIMENSIONS 16-pin plastic DIP (DIP-16P-M04) INDEX-1 INDEX-2 4.36(.172)MAX 3.00(.118)MIN +0.30 0.99 –0 +.012 .039 –0 1.27(.050) MAX 1994 FUJITSU LIMITED D16033S-2C +0.20 19.55 –0.30 +.008 .770 –.012 6.20±0.25 (.244±.010) 0.51(.020)MIN 0.25±0.05 (.010± ...
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... Note 4) Pins width do not include tie bar cutting remainder. 0.17 .007 5.30±0.30 7.80±0.40 (.209±.012) (.307±.016) "A" 8 0.13(.005) M MB3759 +0.03 –0.04 +.001 –.002 Details of "A" part +0.25 2.00 –0.15 (Mounting height) +.010 .079 –.006 0.25(.010) 0~8 ˚ ...
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... MB3759 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 and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, ...