UNISONIC TECHNOLOGIES CO., LTD MC34063A

Transcription

1 UNISONIC TECHNOLOGIES CO., LTD MC34063A DC TO DC CONVERTER CONTROLLER DESCRIPTION The UTC MC34063A is a monolithic regulator subsystem, intended for use as DC to DC converter. This device contains a temperature compensated band gap reference, a duty-cycle control oscillator, driver and high current output switch. It can be used for step down, step-up or inverting switching regulators as well as for series pass regulators. FEATURES * Operation from 3.0V to 40V. * Short circuit current limiting. * Low standby current. * Output switch current of.a without external transistors. * Frequency of operation from 00Hz to 00kHz. * Step-up, step-down or inverting switch regulators. ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package Packing MC34063AL-D08-T MC34063AG-D08-T DIP-8 Tube MC34063AL-S08-R MC34063AG-S08-R SOP-8 Tape Reel MC34063AL-P08-R MC34063AG-P08-R TSSOP-8 Tape Reel MARKING DIP-8 SOP-8 TSSOP-8 8 UTC MC34063A Date Code L: Lead Free G: Halogen Free Lot Code of 9 Copyright 207 Unisonic Technologies Co., Ltd QW-R N

2 PIN CONFIGURATION Switch Collector 8 Driver Collector Switch Emitter 2 7 IPEAK Sense Timing Capacitor 3 6 V CC GND 4 Comparator Inverting input PIN DESCRIPTION PIN NO PIN NAME I/O DESCRIPTION Switch Collector I Internal Darlington pairs TI collector 2 Switch Emitter O Internal Darlington pairs TI emitter 3 Timing Capacitor The value of selected capacitor controls the internal oscillator run rate 4 GND Comparator Inverting Input 6 V CC I Inverting input of comparator which can set & initiate the Darlington pairs output switch 7 I PEAK Sense I Current sense input to monitor the voltage drop across an external resistor placed in series with V CC 8 Driver Collector I Internal Darlington pairs TI collector BLOCK DIAGRAM E Switch Collector T T2 Q S R D 8 Drive Collector Switch Emitter Timing Capacitor 2 C 7 Is A CT OSCILLATOR 3 6 IPEAK Sense Vcc COMP. GND 4.2VREF B Comparator Inverting Input UNISONIC TECHNOLOGIES CO., LTD 2 of 9

3 ABSOLUTE MAXIMUM RATINGS (T A =2 C, unless otherwise specified. ) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC 40 V Comparator Input Voltage V IN(COMP) -0.3 ~ +40 V Switch Collector Voltage V C(SW) 40 V Switch Emitter Voltage V E(SW) 40 V Switch Collector to Emitter Voltage V CE(SW) 40 V Driver Collector Voltage V C(DR) 40 V Switch Current I SW. A DIP-8 20 mw Power Dissipation (T A =2 C) SOP-8 P D 62 mw TSSOP mw Junction Temperature T J +0 C Operating Temperature T OPR 0 ~ +70 C Storage Temperature T STG -6 ~ +0 C Note: Absolute maximum ratings are those values beyond which the device which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT DIP-8 00 C/W Junction-to-Ambient SOP-8 θ JA 60 C/W TSSOP C/W ELECTRICAL CHARACTERISTICS (V CC =.0V, T A =0~+70 C, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT OSCILLATOR Maximum Oscillator Frequency F OSC V PIN =0V, CT=.0nF, T A =2 C khz Charging Current I CHG V CC = to 40V, T A =2 C μa Discharging Current I DISCHG V CC = to 40V, T A =2 C μa Oscillator Amplitude V OSC T A =2 C 0. V Discharge to Charge Current Ratio K V 7 =V CC, T A =2 C Current limit Sense Voltage V SENSE I CHG =I DISCHG, T A =2 C mv OUTPUT SWITCH Saturation Voltage (Note) V CE(SAT) I SW =.0A, V C(DRIVER) =V C(SW) V Saturation Voltage 2 (Note) V CE(SAT)2 I SW =.0A, V C(DRIVER) =0mA V DC Current Gain (Note) G I (DC) I SW =.0A, V CE =.0V, T A =2 C 0 80 Collector Off State Current (Note) I C(OFF) V CE =40.0V, T A =2 C μa COMPARATOR Threshold Voltage V THD V Threshold Voltage Line Regulation V THD V CC =3 ~ 40V mv Input Bias Current I I(BIAS) V IN =0V na TOTAL DEVICE Supply Current I CC V CC =~40V, C T =0.00 V 7 =V CC, V C >V THD, Pin2=GND ma Note: Output switch tests are performed under pulsed conditions to minimize power dissipation. UNISONIC TECHNOLOGIES CO., LTD 3 of 9

4 STEP-UP CONVERTER 70μH L R SC 0.22 VIN2V V CC + - I PK O SC Comp. S Q R C T Q2.2V REF REG Q 2 3 C T 00pF N89 4 R 2 VOUT R 2.2k 47k 28V/7mA CO.0μH VOUT + 00 Optional Filter TEST CONDITIONS RESULTS Line Regulation V IN = 8.0V ~ 6V, I OUT = 7mA 30mV = ±0.0% Load Regulation V IN = 2V, I OUT = 7mA ~ 7mA 0mV = ±0.07% Output Ripple V IN = 2V, I OUT = 7mA 400mV P-P Efficiency V IN = 2V, I OUT = 7mA 87.7% Output Ripple With Optional Filter V IN = 2V, I OUT = 7mA 40mV P-P UNISONIC TECHNOLOGIES CO., LTD 4 of 9

5 STEP-DOWN CONVERTER(Cont.) TEST CONDITIONS RESULTS Line Regulation V IN = V ~ 2V, I OUT = 00mA 2mV = ±0.2% Load Regulation V IN = 2V, I OUT = 0mA ~ 00mA 3.0mV = ±0.03% Output Ripple V IN = 2V, I OUT = 00mA 20mV P-P Short Circuit Current V IN = 2V, R L = 0.Ω.A Efficiency V IN = 2V, I OUT = 00mA 83.7% Output Ripple With Optional Filter V IN = 2V, I OUT = 00mA 40mV P-P UNISONIC TECHNOLOGIES CO., LTD of 9

6 VOLTAGE INVERTING CONVERTER TEST CONDITIONS RESULTS Line Regulation V IN = 4.V ~ 6.0V, I OUT = 00mA 3.0mV = ±0.02% Load Regulation V IN =.0V, I OUT = 0mA ~ 00mA 0.022V = ±0.09% Output Ripple V IN =.0V, I OUT = 00mA 00mV P-P Short Circuit Current V IN =.0V, R L = 0.Ω 90mA Efficiency V IN =.0V, I OUT = 00mA 62.2% Output Ripple With Optional Filter V IN =.0V, I OUT = 00mA 70mV P-P UNISONIC TECHNOLOGIES CO., LTD 6 of 9

7 EXTERNAL CURRENT BOOST CONNECTIONS FOR IC PEAK GREATER THAN.A UNISONIC TECHNOLOGIES CO., LTD 7 of 9

8 TYPICAL CHARACTERISTICS Output Switch ON-OFF Time versus Oscillator Timing Capacitor V CC =.0V Pin 7 = V CC Pin = GND T A = 2 Timing Capacitor Waveform t ON 0 t OFF V CC =.0V Pin 7 = V CC Pin 2 = GND Pin,,8 = Open C T =.0nF T A = Oscillator Timing Capacitor, C T (nf) 0μs/DIV UNISONIC TECHNOLOGIES CO., LTD 8 of 9

9 DESIGN FORMULA TABLE CALCULATION STEP-DOWN STEP-UP VOLTAGE-INVERTING t ON V OUT + V F t OFF V IN -V CE(SAT) (t ON +t OFF ) MAX F MIN F MIN C T 4x0 - t ON 4x0 - t ON 4x0 - t ON I SW 2I OUT(MAX) R S 0.3/I SW 0.3/I SW 0.3/I SW L (MIN) C O 9 I OUT t ON V RIPPLE(P-P) V CE(SAT) V F - Saturation voltage of the output switch. - Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen: V IN - Nominal input voltage. V OUT - Desired output voltage, V OUT =.2(+R 2 /R ) I OUT - Desired output current. F MIN - Minimum desired output switching frequency at the selected values for V IN and I OUT. V RIPPLE(P-P) - Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD 9 of 9