@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
S Q
Q2
Q1
100
I
PK
C
T
1
Switch
Collector
2
I
PK
Sense
7
R
Switch
Emitter
6
V
CC
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 I
PK
Sense
8
6 V
CC
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
V
CC
40
Comparator Input Voltage Range
V
IR
-0.3 to +40
Switch Collector Voltage
V
C(switch)
40
Switch Emitter Voltage (V
PIN1
=40V)
V
E(switch)
40
Switch Collector toEmitter Voltage
V
CE(switch)
40
Driver Collector Voltage
V
C(driver)
40
100
Driver Collector Current (Note1)
I
C(driver)
Switch Current
I
SW
1.5
Power Dissipation and Thermal Charcteristics
P
D
1.25
Plastic Package T
A
=25
100
R
θJA
Thermal Resistance
P
D
0.625
SOIC Package T
A
=25
R
θJA
100
Thermal Resistance
Operating Juncton Temperature
T
J
+150
0 to +70
Operating Ambient Temperature Range
T
A
Storage Temperature Range
T
stg
-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
(V
CC
=5.0V,T
A
=T
low
to T
high
[Note1],unless otherwise specified.)
Characteristics
Symbol
OSCILLATOR
F
OSC
Frequency(V
pin5
=0V, C
T
=1.0nF, T
A
=25
)
I
chg
Charge Current (V
CC
=5.0V to 40V, T
A
=25
)
I
dischg
Discharge Current (V
CC
=5.0V to 40V, T
A
=25
)
I
dischg/
I
chg
Discharge to Charge Current Ratio (Pin 7 to V
CC,
T
A
=25 )
V
ipk(sence)
Current Limit Sense Voltage (I
chg=
I
dischg,
T
A
=25
)
OUTPUT SWITCH (NOTE 2)
Saturation Voltage, Darlington Connection (Note 3)
V
CE(sat)
(I
SW
=1.0A, Pins 1,8 connected)
Saturation Voltage, Darlington Connection
V
CE(sat)
(I
SW
=1.0A, R
pin8
=82Ω to V
CC,
Forced
β≈20)
H
EF
DC Current Gain (I
SW
=1.0A,
V
CE
=5.0V
,
T
A
=25
)
I
C(Off)
Collector Off-State Current (
V
CE
=40V
)
COMPARATOR
Threshold Voltage
(T
A
=25
)
V
th
(T
A
= T
low
to T
high
)
Threshold Voltage Line Regulation (V
CC
=3.0V to 40V)
Reg
line
Input Bias Current (V
in
=0V)
I
IB
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 ((V
CC
=5.0V to 40V, C
T
=1.0nF, (Pin 7 to
-
-
4.0
mA
I
CC
V
CC,
(Pin 5>
V
th
,
(Pin 2=Gnd, remaining pins open)
Notes: 1.
T
low
=0
T
high
=+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/( I
C
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
V
OSC
, OSCILLATOR VOLTAGE (V)
AV34063
t
on
t
off
0.01 0.02 0.05 0.1 0.2
0.5 1.0 2.0
5.0 10
V
CC
=5V
Pin7=VCC
Pin2=Gnd
Pins1,5,8=open
C
T
=1.0nF
T
A
=25℃
10µ s/DIV
Figure2. Timing Capacitor Waveform
C
T
, OSCILLATOR TIMING CAPACITOR (nF)
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor
V
CESAT
, SATURATION VOLTAGE (V)
V
CESAT
, SATURATION VOLTAGE (V)
1.8
1.7
1.6
15
1.4
1.3
1.2
1.1
1.0
0
0.2
V
CC
=5V
Pin1,7,8=V
CC
Pin3,5=Gnd
T
A
=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
V
CC
=5V
Pin7=V
CC
Pin2,3,5=Gnd
T
A
=25℃
(See Note 4)
Forced
β≈20
0.2
0.4
0.6
0.8
1.0
1.2
1.4 1.6
I
E
, EMITTER CURRENT (A)
I
C
, 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
V
IPK(Sense)
, CURRENT LIMIT SENSE
VOLTAGE (V))
400
380
V
CC
=5V
360
I
chg
=I
disch
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
I
CC
, SUPPLY CURRENT (mA)
C
T
=1.0nF
Pin7=VCC
Pin2=Gnd
5.0
10
15
20
25
30
35
40
T
A
, AMBIENT TEMPERATURE (°C)
V
CC
, SUPPLY VOLTAGE (V)
Figure 5. Current Limit Sense Voltage
versus Temperature
Figure 6. Standby Supply Current versus
Supply Voltage
Copyright © Avic Electronics Corp.
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Website:
http://www.avictek.com
200 mV/DIV
V
CC
=5V
Pin7=VCC
Pin5=Gnd
T
A
=25℃
@vic
170µH
L
8
180
S Q
R
7
I
P
OSC
6
100
Comp.
5
V
CC
1.25V
Ref
Reg
Q2
Q1
2
1N5819
C
T
3
C
T
1500pF
4
1
AV34063
R
SC
0.22
V
OUT
R1
2.2K
28V/175mA
1.0µH
V
OUT
100
R2
47K
C
O
330
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Effciency
Output Ripple With Optional Filter
Conditions
Vin = 8.0 V to 16 V, I
O
= 175 mA
Vin = 12 V, I
O
= 75 mA to 175 mA
Vin = 12 V, I
O
= 175 mA
Vin = 12 V, I
O
= 175 mA
Vin = 12 V, I
O
= 175 mA
Figure 7. Step–Up Converter
Results
30 mV = ±0.05%
10 mV = ±0.017%
400 mVpp
87.7%
40 mVpp
8
1
V
OUT
8
1
V
OUT
7
2
R
SC
7
2
R
SC
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 I
C
Peak Greater than 1.5 A
Copyright © Avic Electronics Corp.
5
Website:
http://www.avictek.com
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