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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
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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 Driver Collector Current (Note1) IC(driver) Switch Current ISW 1.5 Power Dissipation and Thermal Charcteristics 1.25 PD Plastic Package TA =25 100 RJA Thermal Resistance PD 0.625 SOIC Package TA =25 RJA 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
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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 =82 to VCC, Forced 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 A A mV V V A
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 s 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 of output switch : ( IC output/( IC driver - 7.0mA) 10 ) *The 100 resister in the emitter of the driver device requires about 7.0mA before the output switch conducts.
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Typical Characteristics
T on-off output switch on-off time (s) 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
10 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 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
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200 mV/DIV
VCC=5V Pin7=VCC Pin5=Gnd TA =25
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170H 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
1.0H
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
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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 220H
Vin 25V
100 5
VOUT
R1 1.2K R2 3.6K
5V/500mA
1.0H
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 = 0.1 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
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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
88H
Vin
4.5V to 6V
1N5819 1500pF 4 1.0H
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 = 0.1 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
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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 2.0s 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.
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