AV34063

AV34063 AVICTEK | Alldatasheet

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Technical content

@vic AV34063 Copyright © Avic Electronics Corp. 1 Website: http://www.avictek.com 1.5A,Step-Up/Down Inverting Switching Regulators

DESCRIPTION

The AV34063 is a monolithic control circuit containing the primary functions required for DC-to-DC converters. This device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit,driver and high current output switch. This device was specifically designed to be incorporated in Step-Down and Step-Up and Voltage-inverting applications with a minimum number of external components.

FEATURES

z Operation from 3.0 to 40V input z Low standby current z Current limiting z Output switch current of 1.5A z Output voltage adjustable z Frequency of operation from 100Hz to 100KHz z Precision 2% reference BLOCK DIAGRAM

ORDERING INFORMATION

Part Number Operating Temperature Range Package Type AV34063 0℃~+70℃ DIP-8 AV34063S 0℃~+70℃ SOP-8 DIP-8 SOP-8 4 5 4 5 Switch Collector Switch Emitter Timing Capacitor Gnd Comparator Inverting Input VCC IPK Sense Drive Collector (Bottom View) (Top View) Switch Collector Switch Emitter Timing Capacitor Gnd Comparator Inverting Input VCC IPK Sense Drive Collector S Q R 100 CT IPK Oscillalo Comparator 1.25 Reference Re gulator

@vic AV34063 Copyright © Avic Electronics Corp. 2 Website: http://www.avictek.com MAXIMUM RATING Characteristic Symbol Value Unit Power Supply Voltage VCC 40 Comparator Input Voltage Range VIR -0.3 to +40 Switch Collector Voltage VC(switch) 40 Switch Emitter Voltage (VPIN1=40V) VE(switch) 40 Switch Collector toEmitter Voltage VCE(switch) 40 Driver Collector Voltage V C(driver) 40 V Driver Collector Current (Note1) I C(driver) 100 mA Switch Current I SW 1.5 A Power Dissipation and Thermal Charcteristics Plastic Package TA =25 Thermal Resistance Thermal Resistance PD RθJA PD RθJA 1.25 100 0.625 100 W / W W / W Operating Juncton Temperature T J +150 Operating Ambient Temperature Range T A 0 to +70 Storage Temperature Range T stg -60~150 Notes: 1. Maximum package power dissipation limits must be observed. 2.ESD data available upon request.

@vic AV34063 Copyright © Avic Electronics Corp. 3 Website: http://www.avictek.com ELECTRICAL CHARACTETRISTICS (VCC=5.0V,TA=Tlow to Thigh [Note1],unless otherwise specified.) Characteristics Symbol Min Typ Max Unit OSCILLATOR Frequency(Vpin5=0V, CT =1.0nF, TA =25 ) FOSC 24 33 42 KHz Charge Current (VCC=5.0V to 40V, TA =25 ) Ichg 24 35 42 µA Discharge Current (VCC=5.0V to 40V, TA =25 ) Idischg 140 220 260 µA Discharge to Charge Current Ratio (Pin 7 to VCC, TA =25 ) Idischg/ Ichg 5.2 6.5 7.5 - Current Limit Sense Voltage (Ichg= Idischg, TA =25 ) Vipk(sence) 250 300 350 mV OUTPUT SWITCH (NOTE 2) Saturation Voltage, Darlington Connection (Note 3) (ISW =1.0A, Pins 1,8 connected) VCE(sat) - 1.0 1.3 V Saturation Voltage, Darlington Connection (ISW =1.0A, Rpin8 =82Ω to VCC, Forced β≈20) VCE(sat) - 0.45 0.7 V DC Current Gain (ISW =1.0A, VCE=5.0V, TA =25 ) HEF 50 75 - - Collector Off-State Current (VCE=40V) IC(Off) - 0.01 100 µA COMPARATOR Threshold Voltage (TA =25 (TA = Tlow to Thigh) Vth 1.238 1.225 1.25 1.262 1.275 V Threshold Voltage Line Regulation (VCC=3.0V to 40V) Regline - 1.4 5.0 mV Input Bias Current (Vin=0V) IIB - -20 -400 nA TOTAL DEVICE Supply Current ((VCC=5.0V to 40V, CT =1.0nF, (Pin 7 to VCC, (Pin 5> Vth, (Pin 2=Gnd, remaining pins open) ICC - - 4.0 mA Notes: 1. Tlow =0 Thigh =+70 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 3. If the output switch is driven into hard saturation (non-Darlington) at low switch current (≤300mA) and high driver currents (≥30mA),it may take up to 2.0 µs for it to come out of saturation. This condition will shorten the off time at frequencies ≥30KHz, and is magnified at high temperature. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended : Forced β of output switch : ( I C output/( IC driver - 7.0mA) ≥10 ) *The 100Ω resister in the emitter of the driver device requires about 7.0mA before the output switch conducts.

@vic AV34063 Copyright © Avic Electronics Corp. 6 Website: http://www.avictek.com Test Conditions Results Line Regulation Vin = 15 V to 25 V, I O = 500 mA 12 mV = ±0.12% Load Regulation Vin = 25 V, I O = 50 mA to 500 mA 3.0 mV = ±0.03% Output Ripple Vin = 25 V, I O = 500 mA 120 mVpp Short Circuit Current V in = 25 V, RL = 0.1 Ω 1.1A Effciency Vin = 25 V, I O = 500 mA 83.7% Output Ripple With Optional Filter Vin = 25 V, I O = 500 mA 40 mVpp 4 5 S R Q IP OSC CT 1N5819 L 220µH CT 470pF 1.25V Ref Re g Comp. VCC VOUT 5V/500mA R 1 1.2K R 2 3.6K CO 470 RSC 0.33 Vin 25V 100 1.0µH VOUT 100 Optional Filter Figure9. Step–Down Converter VOUT VOUT RSC RSC Vin Vin 1 1 2 2 10a. External NPN Switch 10b. External PNP Saturated Switch(See Nt5 ) Figure10. External Current Boost Connections for IC Peak Greater than 1.5 A

@vic AV34063 Copyright © Avic Electronics Corp. 7 Website: http://www.avictek.com Test Conditions Results Line Regulation Vin = 4.5 V to 6 V, I O = 100 mA 3.0 mV = ±0.012% Load Regulation Vin = 5.0 V, I O = 10 mA to 100 mA 0.022 mV = ±0.09% Output Ripple Vin = 5.0 V, I O = 100 mA 500 mVpp Short Circuit Current V in = 5.0 V, RL = 0.1 Ω 910mA Effciency Vin = 5.0 V, I O = 100 mA 62.6% Output Ripple With Optional Filter Vin = 5.0 V, I O = 100 mA 70 mVpp 4 5 S R Q Q2 L 88µH 1N5819 IP OSC CT 1.25V Ref Re g VCC Comp. 1500pF RSC 0.24 Vin 4.5V to 6V 100 100 CO 1000u R 2 8.2K R 1 953 VOUT -12V/100mA 1.0µH VOUT Optional Filter Figure11. Step–Down Converter 12a. External NPN Switch 12b. External PNP Saturated Switch Figure12. External Current Boost Connections for IC Peak Greater than 1.5 A VOUT VOUT Vin Vin 8 1

@vic AV34063 Copyright © Avic Electronics Corp. 8 Website: http://www.avictek.com Note 5 : If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300mA) and high driver currents (≥30mA), it may take up to 2.0µs to come out of sturation. This condition will shorten the off time at frequencies ≥30KHz, and is magnified at high temperatures. This condition does not occur with a darlington configuration, since the output switch cannot saturate. If a non-darlington is used, the following output drive condition is recommended. Vsat=Saturation voltage of the output switch. VF =Forward voltage drop of the output rectifier. The following power supply characteristics must be chosen: Vin -Nominal input voltage. Vout -Desired output voltage, Vout = 1.25(1+R2/R1). Iout - Desired output current. Fmin -Minimum desired output switching frequency at the selected valued of Vin an Io. Vripple(p-p) - Desired peak-to-peak output ripple voltage.In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout.The ripple voltage should be kept to a low value since it will directiy affect the line and load regulation. Figure13. Design Formula Table