@vic AV34063 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. DIP-8 SOP-8 FEATURES Operation from 3.0 to 40V input Low standby current Current limiting Output switch current of 1.5A Output voltage adjustable Frequency of operation from 100Hz to 100KHz Precision 2% reference BLOCK DIAGRAM Drive Collector IPK Sense 1 8 S Q VCC Comparator Inverting Input Q1 2 100 IPK 6 Q2 R 7 Switch Collector CT Oscillalo 3 Comparator 5 Switch Emitter Timing Capacitor 1.25 Reference Regulator 4 Gnd Switch Collector Switch Emitter Timing Capacitor Gnd Drive Collector 7 IPK Sense 8 1 2 3 6 VCC 4 5 Comparator Inverting Input (Top View) (Bottom View) ORDERING INFORMATION Part Number Operating Temperature Range Package Type AV34063 0℃~+70℃ DIP-8 AV34063S 0℃~+70℃ SOP-8 Copyright © Avic Electronics Corp. 1 Website: http://www.avictek.com @vic AV34063 MAXIMUM RATING Characteristic Symbol Value 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 VC(driver) 40 100 C(driver) Driver Collector Current (Note1) I Switch Current ISW 1.5 Power Dissipation and Thermal Charcteristics 1.25 PD Plastic Package TA =25 100 RθJA Thermal Resistance PD 0.625 SOIC Package TA =25 RθJA 100 Thermal Resistance Operating Juncton Temperature TJ +150 0 to +70 Operating Ambient Temperature Range TA Storage Temperature Range Tstg -60~150 Notes: 1. Maximum package power dissipation limits must be observed. 2.ESD data available upon request. Copyright © Avic Electronics Corp. 2 Unit V mA A W /W W /W Website: http://www.avictek.com @vic AV34063 ELECTRICAL CHARACTETRISTICS (VCC=5.0V,TA=Tlow to Thigh [Note1],unless otherwise specified.) Characteristics Symbol OSCILLATOR FOSC Frequency(Vpin5=0V, CT =1.0nF, TA =25 ) Ichg Charge Current (VCC=5.0V to 40V, TA =25 ) Idischg Discharge Current (VCC=5.0V to 40V, TA =25 ) Idischg/ Ichg Discharge to Charge Current Ratio (Pin 7 to VCC, TA =25 ) Vipk(sence) Current Limit Sense Voltage (Ichg= Idischg, TA =25 ) OUTPUT SWITCH (NOTE 2) Saturation Voltage, Darlington Connection (Note 3) VCE(sat) (ISW =1.0A, Pins 1,8 connected) Saturation Voltage, Darlington Connection VCE(sat) (ISW =1.0A, Rpin8 =82Ω to VCC, Forced β≈20) HEF DC Current Gain (ISW =1.0A, VCE=5.0V, TA =25 ) IC(Off) Collector Off-State Current (VCE=40V) COMPARATOR Threshold Voltage (TA =25 ) Vth (TA = Tlow to Thigh) Threshold Voltage Line Regulation (VCC=3.0V to 40V) Regline Input Bias Current (Vin=0V) IIB Min Typ Max Unit 24 24 140 5.2 250 33 35 220 6.5 300 42 42 260 7.5 350 KHz µA µA mV - 1.0 1.3 V - 0.45 0.7 V 50 - 75 0.01 100 µA 1.238 1.225 - 1.25 1.4 -20 1.262 1.275 5.0 -400 V mV nA TOTAL DEVICE Supply Current ((VCC=5.0V to 40V, CT =1.0nF, (Pin 7 to 4.0 mA ICC VCC, (Pin 5> Vth, (Pin 2=Gnd, remaining pins open) 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 : ( IC 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. Copyright © Avic Electronics Corp. 3 Website: http://www.avictek.com @vic AV34063 VCC=5V Pin7=VCC Pin5=Gnd TA =25℃ ton toff 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 VCC=5V Pin7=VCC Pin2=Gnd 200 mV/DIV 1000 500 200 100 50 20 10 5.0 2.0 1.0 VOSC, OSCILLATOR VOLTAGE (V) T on-off output switch on-off time (µs) Typical Characteristics Pins1,5,8=open CT =1.0nF TA =25℃ 10µ s/DIV CT, OSCILLATOR TIMING CAPACITOR (nF) Figure2. Timing Capacitor Waveform 1.8 1.7 1.6 15 1.4 VCC=5V Pin1,7,8=VCC Pin3,5=Gnd TA =25℃ (See Note 4) 1.3 1.2 1.1 1.0 0 0.2 0.4 06 0.8 1.0 1.2 1.4 1.6 VCESAT , SATURATION VOLTAGE (V) VCESAT , SATURATION VOLTAGE (V) Figure 1. Output Switch On–Off Time versus Oscillator Timing Capacitor 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Darlington Connection VCC=5V Pin7=VCC Pin2,3,5=Gnd TA =25℃ (See Note 4) 0 0.2 IE, EMITTER CURRENT (A) 25 50 0.8 1.0 1.2 1.4 1.6 Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current ICC, SUPPLY CURRENT (mA) VIPK(Sense), CURRENT LIMIT SENSE VOLTAGE (V)) 0 0.6 IC, COLLECTOR CURRENT(A) Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter C t 400 380 VCC=5V 360 Ichg=Idisch 340 320 300 280 260 240 220 200 -55 -25 0.4 Forced β≈20 75 100 125 CT =1.0nF Pin7=VCC Pin2=Gnd 0 5.0 10 15 20 25 30 35 40 VCC, SUPPLY VOLTAGE (V) TA, AMBIENT TEMPERATURE (°C) Figure 5. Current Limit Sense Voltage versus Temperature Copyright © Avic Electronics Corp. 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 Figure 6. Standby Supply Current versus Supply Voltage 4 Website: http://www.avictek.com @vic AV34063 170µH L 8 1 180 S Q Q2 R Q1 7 2 1N5819 IP RSC 0.22 CT OSC 6 3 CT VCC 100 Comp. 1.25V Ref Reg 1500pF 5 4 VOUT R1 2.2K 1.0µH VOUT 28V/175mA R2 47K CO 330 100 Optional Filter Test Line Regulation Load Regulation Output Ripple Effciency Output Ripple With Optional Filter Conditions Vin = 8.0 V to 16 V, IO = 175 mA Vin = 12 V, IO = 75 mA to 175 mA Vin = 12 V, IO = 175 mA Vin = 12 V, IO = 175 mA Vin = 12 V, IO = 175 mA Results 30 mV = ±0.05% 10 mV = ±0.017% 400 mVpp 87.7% 40 mVpp Figure 7. Step–Up Converter 8 VOUT 1 7 VOUT 1 7 2 2 RSC RSC Vin 8 6 6 Vin 8a. External NPN Switch R → 0 for constant Vin 8b. External NPN Saturated Switch Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A Copyright © Avic Electronics Corp. 5 Website: http://www.avictek.com @vic AV34063 8 1 S Q R Q2 Q1 7 2 IP RSC 0.33 OSC CT 3 6 Vin 25V 1N5819 VCC L Comp. 1.25V Ref Reg 100 220µH CT 470pF 5 4 1.0µH VOUT R1 1.2K VOUT 5V/500mA R2 3.6K CO 470 100 Optional Filter Test Line Regulation Load Regulation Output Ripple Short Circuit Current Effciency Output Ripple With Optional Filter Conditions Vin = 15 V to 25 V, IO = 500 mA Vin = 25 V, IO = 50 mA to 500 mA Vin = 25 V, IO = 500 mA V in = 25 V, RL = 0.1Ω Vin = 25 V, IO = 500 mA Vin = 25 V, IO = 500 mA Results 12 mV = ±0.12% 3.0 mV = ±0.03% 120 mVpp 1.1A 83.7% 40 mVpp Figure9. Step–Down Converter 8 8 1 1 VOUT 7 7 2 2 VOUT RSC RSC 6 6 Vin Vin 10a. External NPN Switch N t 5) 10b. External PNP Saturated Switch(See Figure10. External Current Boost Connections for IC Peak Greater than 1.5 A Copyright © Avic Electronics Corp. 6 Website: http://www.avictek.com @vic AV34063 8 1 Q2 S Q R 7 Q1 2 RSC 0.24 IP OSC 6 L CT 3 VCC Vin 4.5V to 6V 88µH Comp. 100 5 1.25V Ref Reg 1N5819 1500pF 4 1.0µH VOUT R2 8.2K VOUT -12V/100mA R1 953 CO 1000u 100 Optional Filter Test Line Regulation Load Regulation Output Ripple Short Circuit Current Effciency Output Ripple With Optional Filter Conditions Vin = 4.5 V to 6 V, IO = 100 mA Vin = 5.0 V, IO = 10 mA to 100 mA Vin = 5.0 V, IO = 100 mA V in = 5.0 V, RL = 0.1Ω Vin = 5.0 V, IO = 100 mA Vin = 5.0 V, IO = 100 mA Results 3.0 mV = ±0.012% 0.022 mV = ±0.09% 500 mVpp 910mA 62.6% 70 mVpp Figure11. Step–Down Converter 8 1 7 2 VOUT Vin 6 Vin 12a. External NPN Switch 8 1 7 2 VOUT 6 12b. External PNP Saturated Switch Figure12. External Current Boost Connections for IC Peak Greater than 1.5 A Copyright © Avic Electronics Corp. 7 Website: http://www.avictek.com @vic AV34063 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. Figure13. Design Formula Table 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. Copyright © Avic Electronics Corp. 8 Website: http://www.avictek.com