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| LAB TOP VIEW VCC VZ FEEDBACK GAIN 1 8 SEME IP5661C IP5561C GND OUTPUT CURRENT SENSE RT/CT 2 7 SWITCHED-MODE POWER SUPPLY CONTROL CIRCUIT FEATURES * STABILISED POWER SUPPLY * TEMPERATURE COMPENSATED REFERENCE SOURCE * SAWTOOTH GENERATOR * PULSE WIDTH MODULATOR * CURRENT LIMITING * 8 PIN DIP VCC 3 6 4 5 J Package - 8 Pin Ceramic DIP N Package - 8 Pin Plastic DIP D Package - 8 Pin Plastic (150) SOIC BLOCK DIAGRAM RT CT 5 REFERENCE VOLTAGE ERROR AMP FEEDBACK GAIN 3 SAWTOOTH GENERATOR DESCRIPTION 7 S 4 OUTPUT PWM LATCH R 0.5V CURRENT SENSE 6 STABILISED SUPPLY 2 8.2V Vz 1 8 VCC GND The IP5561 is a control circuit for use in switched mode power supplies. This single monolithic chip incorporates all the control and supervisory (protection) functions required in switched mode power supplies, including an inter nal temperature compensated reference source, internal zener reference, sawtooth generator, pulse width modulator, output stage and cycle by cycle current limit. Order Information Part Number IP5561 IP5561C J-Pack 8 Pin N-Pack 8 Pin D-8 8 Pin Temp. Range -55 to +125C 0 to +70C Note: To order, add the package identifier to the part number. eg. IP5561J IP5561CD-8 ABSOLUTE MAXIMUM RATINGS (Tcase = 25C unless otherwise stated) SUPPLY Voltage Sourced Current Sourced 18V 30mA OUTPUT TRANSISTOR Output Current Collector Voltage (Pin 7) Operating Junction Temperature Storage Temperature Range Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. TJ TSTG 40mA 18V See Ordering Information -55 to +150C Prelim. 4/95 Semelab plc. LAB ELECTRICAL CHARACTERISTICS (TJ = 25C unless otherwise stated) Parameter Test Conditions Min. 3.69 TJ = Over Temp. Range IL = -7mA 3.65 100 7.8 8.2 200 8.8 7.8 SEME IP5661C IP5561C IP5561 Typ. Max. 3.75 3.84 3.88 Min. 3.57 3.55 IP5561C Typ. Max. 3.75 3.96 3.98 100 8.2 200 8.8 Units REFERENCE SECTIONS Internal Reference Voltage (VREF) Temperature Coefficient of VREF Internal Reference (VZ) Temperature Coefficient of VZ V ppm/C V ppm/C OSCILLATOR SECTION Frequency Range Initial Accuracy Oscillator Duty Cycle Range TJ = Over Temp. Range fO = 20kHz 50 12 0-90 0-98 0-90 100k 50 12 0-98 100k Hz % CURRENT LIMITING IIN Vpin6 = 250mV TJ = Over Temp. Range Inhibit Delay Time Single Pulse Inhibit Delay Current Limit Trip Level for 20% overdrive IOUT = 20mA IOUT = 40mA 0.40 0.88 0.7 0.50 -2 -10 -20 1.10 0.8 0.60 0.40 0.88 0.7 0.50 -2 -10 -20 1.10 0.8 0.60 A s V ERROR AMPLIFIER Output Voltage Swing (VOH) Output Voltage Swing (VOL) Open Loop Gain Feedback Resistor Small Signal Bandwidth 10k 3 60 10k 3 6.2 0.7 60 6.2 0.7 V dB MHz OUTPUT STAGE VCE(sat) Output Current IC = 20mA TJ = Over Temp. Range 20 0.4 20 0.4 V mA TJ = Over Temp. Range SUPPLY VOLTAGE/CURRENT Supply Current (ICC) Supply Voltage (VCC) IZ = 0, Voltage Fed TJ = Over Temp. Range ICC = 10mA, Voltage Fed ICC = 30mA, Voltage Fed 20 20 21 10 13 22 30 19 20 21 10 13 24 30 mA V LOW SUPPLY PROTECTION Pin 1 Threshold 8 9 10.5 8 9 10.5 V NOTES 1) Test Conditions: VCC = 12V , TJ = 25C unless otherwise stated 2) Tests marked TJ = Over Temp. Range apply over the full temperature range ie. TJ = -55 to +125C for IP5561 TJ = 0 to +70C for IP5561C Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 4/95 LAB Open Loop Phase 0 60 SEME IP5661C IP5561C TYPICAL PERFORMANCE CHARACTERISTICS -- ERROR AMPLIFIER Open Loop Gain -30 50 PHASE ANGLE () -60 GAIN (dB) 40 -90 30 -120 20 -150 10 -180 0 1k 10k 100k FREQUENCY (Hz) 1M 10M 1k 10k 100k FREQUENCY (Hz) 1M 10M Transfer Curve of Pulse Width Modulator Duty Cycle vs Input Voltage 100 MAX - MAXIMUM DUTY CYCLE (%) 90 80 - DUTY CYCLE (%) 70 60 50 40 30 20 10 0 0 1 2 V 3 Pin 4 Maximum Duty Cycle vs Base Voltage on Q1 100 90 80 70 60 50 40 30 20 10 0 4 5 6 0 1 2 V Pin 1 3 4 5 Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 4/95 LAB Power Derating Curve 1.00 VPIN4 SEME IP5661C IP5561C TYPICAL PERFORMANCE CHARACTERISTICS -- ERROR AMPLIFIER Slow Start Voltage 0.75 PD MAX (W) 0.50 0.25 0.00 25 50 75 100 125 150 t = R'C t TA AMBIENT TEMPERATURE (C) PD = VCC ICC + ( VCC - VZ ) IZ + ( Vpin7 Ipin7 x ) Typical Frequency Plot vs RT and CT 200 Start-up Circuit (Optional) VZ 2 OSCILLATOR FREQUENCY (kHz) 100 50 R=5 k R=1 0 k 2 IP5561 R1 4 R=2 0k R=4 0k RT V1 C Q1 IP5561 5 R2 10 5 CT max = f ( R2 R1+R2 VZ + VBE Q1 ) 1 1.5 2 2.5 3 3.5 4 4.5 (nF) 5 TIMING CAPACITANCE Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 4/95 |
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