AV34063S

@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 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 SOP-8 BLOCK DIAGRAM Drive Collector 8 SQ Q2 Q1 100 IPK CT 1 Switch Collector 2 IPK Sense 7 R Switch Emitter 6 VCC Oscillalo 3 1.25 Reference Regulator Comparator Timing Capacitor 4 Gnd Comparator Inverting Input 5 Switch Collector Switch Emitter Timing Capacitor Gnd 1 2 3 4 (Top View) Drive Collector 7 IPK Sense 8 6 VCC 5 Comparator Inverting Input (Bottom View) ORDERING INFORMATION Part Number AV34063 AV34063S Operating Temperature Range 0℃~+70℃ 0℃~+70℃ Package Type DIP-8 SOP-8 Copyright © Avic Electronics Corp. 1 Website: http://www.avictek.com @vic MAXIMUM RATING AV34063 Unit 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. V mA A W /W W /W Copyright © Avic Electronics Corp. 2 Website: http://www.avictek.com @vic 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 24 24 140 5.2 250 50 - AV34063 Typ 33 35 220 6.5 300 1.0 0.45 75 0.01 Max 42 42 260 7.5 350 1.3 0.7 100 Unit KHz µA µA mV V V 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 Typical Characteristics T on-off output switch on-off time (µs) 1000 500 200 100 50 20 10 5.0 2.0 1.0 VOSC, OSCILLATOR VOLTAGE (V) AV34063 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 Pins1,5,8=open CT =1.0nF TA =25℃ 10µ s/DIV Figure2. Timing Capacitor Waveform CT, OSCILLATOR TIMING CAPACITOR (nF) Figure 1. Output Switch On–Off Time versus Oscillator Timing Capacitor VCESAT , SATURATION VOLTAGE (V) VCESAT , SATURATION VOLTAGE (V) 1.8 1.7 1.6 15 1.4 1.3 1.2 1.1 1.0 0 0.2 VCC=5V Pin1,7,8=VCC Pin3,5=Gnd TA =25℃ (See Note 4) 0.4 06 0.8 1.0 1.2 1.4 1.6 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 Darlington Connection VCC=5V Pin7=VCC Pin2,3,5=Gnd TA =25℃ (See Note 4) Forced β≈20 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 IE, EMITTER CURRENT (A) IC, COLLECTOR CURRENT(A) Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter C t Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current VIPK(Sense), CURRENT LIMIT SENSE VOLTAGE (V)) 400 380 VCC=5V 360 Ichg=Idisch 340 320 300 280 260 240 220 200 -55 -25 0 25 50 75 100 125 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 0 ICC, SUPPLY CURRENT (mA) CT =1.0nF Pin7=VCC Pin2=Gnd 5.0 10 15 20 25 30 35 40 TA, AMBIENT TEMPERATURE (°C) VCC, SUPPLY VOLTAGE (V) Figure 5. Current Limit Sense Voltage versus Temperature Figure 6. Standby Supply Current versus Supply Voltage Copyright © Avic Electronics Corp. 4 Website: http://www.avictek.com 200 mV/DIV VCC=5V Pin7=VCC Pin5=Gnd TA =25℃ @vic 170µH L 8 180 SQ R 7 IP OSC 6 100 Comp. 5 VCC 1.25V Ref Reg Q2 Q1 2 1N5819 CT 3 CT 1500pF 4 1 AV34063 RSC 0.22 VOUT R1 2.2K 28V/175mA 1.0µH VOUT 100 R2 47K CO 330 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 Figure 7. Step–Up Converter Results 30 mV = ±0.05% 10 mV = ±0.017% 400 mVpp 87.7% 40 mVpp 8 1 VOUT 8 1 VOUT 7 2 RSC 7 2 RSC Vin 6 6 Vin R → 0 for constant Vin 8a. External NPN Switch 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 8 SQ R 7 1 AV34063 Q2 Q1 2 1N5819 RSC 0.33 6 IP OSC VCC Comp. CT 3 L 1.25V Ref Reg CT 470pF 4 220µH Vin 25V 100 5 VOUT R1 1.2K R2 3.6K 5V/500mA 1.0µH VOUT 100 CO 470 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 Figure9. Step–Down Converter Results 12 mV = ±0.12% 3.0 mV = ±0.03% 120 mVpp 1.1A 83.7% 40 mVpp 8 1 8 1 VOUT 7 RSC 6 2 7 2 VOUT RSC 6 Vin 10a. External NPN Switch N t 5) Vin 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 8 Q2 Q1 2 L 3 Comp. 100 5 1.25V Ref Reg 1 SQ R AV34063 7 RSC 0.24 6 IP OSC VCC CT 88µH Vin 4.5V to 6V 1N5819 1500pF 4 1.0µH VOUT R2 8.2K -12V/100mA VOUT 100 R1 953 CO 1000u 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 Figure11. Step–Down Converter Results 3.0 mV = ±0.012% 0.022 mV = ±0.09% 500 mVpp 910mA 62.6% 70 mVpp 8 1 8 1 VOUT 7 2 VOUT Vin 6 7 2 Vin 6 12a. External NPN Switch 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