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| IP35063 IP33063 IP34063 TOP VIEW SW ITCH COLLECTOR SW ITCH EMITTER TIM ING C APACITOR GND DC-DC CONVERTER CONTROL CIRCUIT 8 7 6 5 D RIVER C OLLEC TO R 1 2 3 4 Ipk SENSE FEATURES * * * * * * * Operation from 2.5 to 40V input Low Standby Current Current Limiting Output switch current of 1.5A Output voltage adjustable from 1.25 to 40V Operating frequency from 100Hz to 100kHz Direct replacement for MC34063/MC34063A series VC C C OMP AR ATOR INVER TIN G INPUT J Package - 8 Pin Ceramic DIP N Package - 8 Pin Plastic DIP D-8 Package - 8 Pin Plastic (150) SOIC Order Information Part Number IP35063 IP33063 IP34063 J-Pack 8 Pin N-Pack 8 Pin D-8 8 Pin Temp. Range -55 to +125C -40 to +85C 0 to +70C Note: To order, add the package identifier to the part number. eg. IP35063D-8 ABSOLUTE MAXIMUM RATINGS Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage Switch Collector to Emitter Voltage Driver Collector Voltage Switch Current Power Dissipation @ Tamb = 25C Derate above 25C Operating Junction Temperature Ceramic Packages Plastic Packages Ceramic Packages Plastic Packages +40V -0.3V to +40V 40V 40V 40V 40V 1.5A 1.25W 1W 10mW/C 150C 125C See Table Above -65 to 150C Prelim. 2/95 Operating Ambient Temperature Range See Table Above Storage Temperature Range Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. IP35063 IP33063 IP34063 DESCRIPTION The IP34063 series of control circuits contains all the functions required to implement DC-DC converters. Included are internal voltage reference, comparator, controlled duty cycle oscillator with current limit circuit, driver, and high current output switch. This series was specifically designed to be incorporated in Step-Down (Buck) and Step-Up (Boost) applications with a minimum number of external components. Driver Collector 8 1 Switch Collector S R 7 Ipk Sense OSCILLATOR Q Q2 Q1 170 2 Switch Emitter 6 V CC COMPARATOR 1.25 V REFERENCE REGULATOR Comparator Inverting Input 5 3 Timing Capacitor 4 Gnd ELECTRICAL CHARACTERISTICS Parameter (Test Parameters unless otherwise stated : VCC = 5V , TJ = 25C) Min. 20 150 Typ. 35 200 0.5 6.0 250 300 1 0.45 35 120 10 1.18 1.25 0.04 40 CT = 0.001F VPIN 5 > Vth 2.4 3.5 mA 1.32 0.2 400 350 1.3 0.7 Max. 50 250 Units A A Vpp -- mV V V -- nA V mV/V nA Test Conditions VCC = 5 to 40V VCC = 5 to 40V Ipk(sense) = VCC Ichg = Idischg OSCILLATOR Charging Current Discharge Current Voltage Swing Discharge to Charge Current Ratio Current Limit Sense Voltage OUTPUT SWITCH Saturation Voltage, Darlington Connection * ISW = 1.0A Saturation Voltage * DC Current Gain Collector Off-State Current ISW = 1.0A IC(Driver) = 50mA (Forced = 20) ISW = 1.0A , VCE = 5.0V VCE = 40V COMPARATOR Threshold Voltage * Threshold Voltage Line Regulation * Input Bias Current * VCC = 3 to 40V VIN = 0V VCC = 5 to 40V Supply Current * Ipk(sense) = VCC TOTAL DEVICE Pin 2 = Gnd , Remaining Pins Open. NOTES * Applies over full operating temperature range (see order information). Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 IP35063 IP33063 IP34063 DESIGN FORMULA TABLE Calculation tON tOFF (tON + tOFF)MAX CT Ipk(switch) RSC L(MIN) CO 4x Step-Down VOUT + VF VIN(MAX) - VSAT - VOUT 1 fMIN 10-5 tON Step-Up VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 fMIN 4 x 10-5 tON 2 IOUT(MAX) tON + tOFF tOFF 2 IOUT(MAX) 0.33 / Ipk(switch) VIN(MAX) - VSAT - VOUT Ipk(switch) tON(MAX) 0.33 / Ipk(switch) VIN(MIN) - VSAT Ipk(switch) tON(MAX) Ipk(switch) (tON + tOFF) 8 Vripple(p-p) IOUT tON Vripple KEY VSAT VF -- Saturation voltage of the output switch. -- Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen:- VIN VOUT IOUT fMIN Vripple(p-p) -- Nominal input voltage. If this voltage is not constant, then use VIN(MAX) for step-down and VIN(Min) for step-up converter. R2 -- Desired output voltage, VOUT = 1.25 1 + . R1 -- Desired output current. -- Minimum desired output switching frequency at the selected values for VIN and IO. -- Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitors equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. ( ) Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 IP35063 IP33063 IP34063 APPLICATIONS INFORMATION Step-Down Converter Step-Up Converter L 170 H 8 S R Q Q2 Q1 170 Ipk 1 1 8 0 8 S R Q Q2 Q1 170 Ip k 1N5822 1 7 R SC 0.33 V IN 25V 100 F OSCILLATOR CT 2 R SC 0.22 7 OSCILLATOR CT 2 1N5819 6 V CC COMPARATOR 1.25 V REFERENCE REGULATOR 3 CT 470pF L 220 H V IN 12V 100 F 6 V CC COMPARATOR 1.25 V REFERENCE REGULATOR 3 CT 1 50 0p F 5 4 5 4 V OUT R1 1.2K R2 3.3K 5.0V 500mA CO 470 F R1 2 .2 K R2 47K V OUT 28V 175 mA CO 1500 F External Current Boost Connections for IC > 1.5A Step-Down, External NPN Switch Step-Up, External NPN Switch 8 S R Q Q2 Q1 170 1 8 S R Q Q2 Q1 170 1 V OUT 7 OSCILLATOR R SC V IN 2 V OUT R SC 7 OSCILLATOR 2 6 COMPARATOR 1.25 V REFERENCE REGULATOR 3 V IN 6 COMPARATOR 1.25 V REFERENCE REGULATOR 3 5 4 5 4 Step-Down, External PNP Saturated Switch Step-Up, External NPN Saturated Switch 8 S R Q Q2 Q1 170 1 VO U T 8 S R Q Q2 Q1 1 70 1 VO U T 7 O S CILLA TO R RS C VI N 2 7 O SC ILL AT O R R SC 2 R - 0 FOR C O NS TA NT V IN 6 C O M PA RA TO R 1.2 5 V R EF ER EN C E RE G UL AT O R 3 V IN 6 C O M PA RA TO R 1 .25 V R EF ER EN CE RE G UL ATO R 3 5 4 5 4 Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 IP35063 IP33063 IP34063 TYPICAL PERFORMANCE CHARACTERISTICS Output Switch On-Off Time vs Oscillator Timing Capacitor OUTPUT SWITCH ON-OFF TIME (s) 1 00 0 ICC SUPPLY CURRENT (mA) 500 V CC = 5V Standby Supply Current vs Supply Voltage 3.2 C T = 0.001F Ipk(sense) = VCC Ipk(sense) = VCC Pin 5 = Gnd 200 100 50 20 10 5 2 2.4 Pin 2 = Gnd t on t off 1.6 0.8 1 0.1 0.2 0.5 CT 1 2 5 10 20 50 10 0 OSCILLATOR TIMING CAPACITOR (nF) 0 0 5 10 15 20 25 30 35 40 V CC SUPPLY VOLTAGE (V) Emitter-Follower Configuration Output Switch Saturation Voltage vs Emitter Current 1.6 VCE(sat) SATURATION VOLTAGE (V) V CC = 5V Common-Emitter Configuration Output Switch Saturation Voltage vs Collector Current 1.2 VCE(sat) SATURATION VOLTAGE (V) V CC = 5V 1.5 1.4 1.3 1.2 1.1 1.0 0 Pin 1,7,8 = VCC Pin 3,5 = Gnd 1.0 0.8 0.6 Pin 7 = VCC Pin 2,3,5 = G nd DARLINGTON CONNECTION FORCED = 20 0.4 0.2 0 0.2 0.4 IE 0.6 0.8 1.0 1.2 1.4 0 0.2 0.4 IC 0.6 0.8 1.0 1.2 1.4 EMITTER CURRENT (A) COLLECTOR CURRENT (A) Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 |
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