Avic AV34063S 1.5a,step-up/down inverting switching regulator Datasheet

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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
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
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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.
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Unit
V
mA
A
W
/W
W
/W
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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.
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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
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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
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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
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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
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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 2.0µs 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.
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