Wing MC34063ADRG Dc-to-dc converter control circuit Datasheet

MC34063A
DC-TO-DC Converter Control Circuits
DESCRIPTION
PIN CONFIGURATION
The MC34063A is a monolithic control circuit containing
the primary functions required for DC-to-DC converters.
The 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. MC34063A is specifically designed
to be incorporated in Step-Down, Step-Up and VoltageInverting applications with a minimum number of external components.
Switch
Collector
1
8
Diver
Collector
Switch
Emitter
2
7
IPK Sense
Timing
Capacitor
3
6
VCC
5
Comparator
Inverting
Input
GND
4
(Top View)
FEATURES
Operation from -0.3V to 40V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.5A
Output Voltage Adjustable
Frequency Operation to 42kHz
Precision 2% Reference
APPLICATION
DC-DC Converter
ORDERING INFORMATION
Temperature Range
0°C to +70°C
Package
SOP8L
SOP8L
Pb-Free
DIP8L
1
Orderable
Device
Package Qty
MC34063ADG
MC34063ADRG
75Units/Tube
2500Units/Tape
MC34063APG
50Units/Tube
MC34063A
DC-TO-DC Converter Control Circuits
SCHEMATIC DIAGRAM
1
8
Switch
Collector
Drive
Collector
Q2
S Q
Q1
R
7
100
Ipk
Sense
2
Switch
Emitter
Ipk
Oscillator GT
6
3
Timing
Capacitor
VCC
+
1,25V
Reference
Regulator
Comparator
_
5
4
GND
Comparator
Inverting
Input
(Bottom View)
Figure 1. Representative Schematic Diagram
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Value
Unit
Power Supply Voltage
VCC
40
V
Comparator Input Voltage Range
VIR
−0.3 to +40
V
Switch Collector Voltage
Switch Emitter Voltage (VPin1 = 40 V)
VC(switch)
VE(switch)
40
40
V
V
Switch Collector to Emitter Voltage
VCE(switch)
40
V
VC(driver)
IC(driver)
40
100
V
mA
ISW
1.5
A
625
mW
1.25
W
Driver Collector Voltage
Driver Collector Current (Note 1)
Switch Current
Power Dissipation, TA = 25°C
D Package
PD
P Package
Thermal Resistance, TA = 25°C
D Package
RθJA
P Package
160
100
°C/W
Operating Junction Temperature
Operating Ambient Temperature Range
TJ
+150
°C
TA
0 to +70
°C
Storage Temperature Range
Tstg
−65 to +150
°C
2
MC34063A
DC-TO-DC Converter Control Circuits
ELECTRICAL CHARACTERISTICS
(Vcc = 5.0V, TA=0 to +70°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ Max Unit
OSCILLATOR
Frequency
fosc
V Pin5 =0V,C T =1.0nF,T A = 25°C 24
33
42
kHz
Charge Current
Ichg
V CC = 5.0V to 40V, T A = 25°C 24
33
42
μA
I dischg
V CC = 5.0V to 40V, T A = 25°C 140
200 260
Idischg/Ichg
Pin7 to V CC , T A =25°C
5.2
6.2
Vlpk(sense)
I chg = I dischg , T A = 25°C
250
300 350
Discharge Current
Discharge to Charge
Current Ratio
Current Limit
Sense Voltage
OUTPUT SWITCH (Note 3)
Saturation Voltage,
VCE(sat)
Darlington Connection
Saturation Voltage,
Darlinton Connection
VCE(sat)
DC Current Gain
hFE
Collector Off-State
Current
IC(off)
I SW = 1.0A,
Pins 1, 8 connected
ISW = 1.0A, Forced β = 20
RPin 8 = 82Ω to VCC
I SW = 1.0A, V CE =5.0V,
T A = 25°C
7.5
mV
1.3
V
0.45 0.7
V
1.0
50
μA
75
V CE = 40V
40
T A = 25°C
1.225 1.25 1.275
100
μA
COMPARATOR
Threshold Voltage
V th
Threshold Voltage
Line Regulation
Reg line
Input Bias Current
T A = T low to T high
1.21
1.29
V
V CC = 3.0V to 40V
1.4
IIB
V in = 0V
-20 -400
nA
ICC
V CC = 5.0V to 40V,
C T = 10nF, V pin7 = V CC ,
V Pin5 > V th , Pin 2 = GND,
Remaining pins open
2.5
mA
5.0
mV
TOTAL DEVICE
Supply Current
4.0
NOTE 1: Maximum package power dissipation limits must be observed
NOTE 2: Low duty cycle pulse techniques are used during test to maintain juction temperature as
close to ambient temperature as possible
3
MC34063A
DC-TO-DC Converter Control Circuits
Assembly Information:
CHIP APPEARANCE
CHIP SIZE
CHIP THICKNESS
8
1
1a
1b
2a
2b
7
3
BONDING PAD
DIMENSION
2
3
4
5
6
4
5
6
7
8
SCRIBE LINE WIDTH
TOP METAL
BACK METAL
WAFER SIZE
4
SWITCH
COLLECTOR
SWITCH
EMITTER
TIMING
CAPACITOR
GROUND
COMPARATOR
INVERTING
INPUT
Vcc
Ipk SENCE
DRIVER
COLLECTOR
1,18 × 1,27 mm
460 ± 20 μm
90 × 90 μm
90 × 90 μm
90 × 90 μm
90 × 90 μm
90 × 90 μm
90 × 90 μm
90 × 90 μm
90 × 90 μm
96 μm
Al
–
100 mm
MC34063A
500
V CC =5.0V
Pin7=V CC
Pin5=GND
T A =25°C
200
100
50
t on
20
10
5.0
t off
2.0
1.0
0.01 0.02 0.05 0.1 0.2 0.5
1.0 2.0
5.0
VCC=5.0V Pins1,5,8=Open
Pin7=VCC CT=1.0μF
Pin2=GND TA=25°C
10
10μS / DIV
CT,OSCILLATOR TIMING CAPACITOR(nF)
Figure 2. Output Switch On−Off Time vs.
Oscillator Timing Capacitor
Figure 3. Timing Capacitor Waveform
1.7
1.6
1.5
1.4
VCC=5.0V
Pins1,7,8=Vcc
Pins3,5=GND
TA = 25ºC
1.3
1.2
1.1
1.0
0
0.2
VCE(sat),SATURATION VOTAGE(V)
1.1
1.8
VCE(sat),SATURATION VOTAGE(V)
200 mV / DIV
1000
VOSC,OSOCILLATOR VOLTAGE(V)
ton-off.OUTPUT SWITCH ON-OFF TIME(μS)
DC-TO-DC Converter Control Circuits
TYPICAL PERFORMANCE CHARACTERISTICS
1.0
0.9
Darlington Connection
0.8
0.7
0.6
VCC=5.0V
Pin7=Vcc
Pins 2,3,5=GND
TA = 25ºC
0.5
0.4
Forcedβ = 20
0.3
0.2
0.1
0
0
0.4 0.6 0.8 1.0 1.2 1.4 1.6
IC, COLLECTOR CURRENT(A)
IE, EMITTER CURRENT(A)
Figure 4. Emitter Follower Configuration Output
Saturation Voltage vs. Emitter Current
Figure 5. Common Emitter Configuration Output Switch
Saturation Voltage vs. Collector Current
3.6
380
ICC,SUPPLY CURRENT(mA)
VIPK(sense),CURRENT LIMIT
400
Vcc=5.0V
Ichg=Idischg
360
SENSE VOLTAGE(V)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
340
320
300
280
260
240
220
3.2
2.8
2.4
2.0
1.6
1.2
0.4
0
200
-55
-25
0
25
50
75
100 125
TA,AMBIENT TEMPERATURE(°C)
Figure 6. Current Limit Sense Voltage vs.
Temperature
CT=1.0nF
Pin7=Vcc
Pin2=GND
0.8
0
5.0 10
15
20
25 30
35
40
VCC,S UPPLY VOLTAGE(V)
Figure 7. Standby Supply Current vs. Supply Voltage
5
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION
L1
170μH
R3
8
1
DRC
SWC
Ipk
SWE
180Ω
7
RSG
6
2
VCC
TC
D1
BYV10-40
3
0.22Ω
VIN
5
12V
C2
100μF
CII
GND
4
+
VOUT
C3
1.5nF
R1
R2
2.2kΩ
47kΩ
C3
330μF
+
Figure 8. Step−Up Converter
For VOUT=28V
Parameter
Test Conditions
Result(Typ)
Unit
Line Regulation
VIN = 8 to 16 V, IO = 175 mA
30
mV
Load Regulation
VIN = 12 V, IO = 75 to 175 mA
mV
Output Ripple
VIN = 12 V, IO = 175 mA
10
300
Efficiency
VIN = 12 V, IO = 175 mA
89
%
6
mV
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
8
1
DRC
SWC
BYV10-40
7
RSC
0.33Ω
Ipk
SWE
D1
6
5
Vin
C2
100μF
2
VCC
CII
TC
GND
3
4
+
L1
220μH
C3
470pF
R2
R1
1.2kΩ
3.6kΩ
C1
470μF
+
Figure 9. Step−Down Converter
For VOUT = 5V
Result(Typ)
Unit
VIN = 15 to 25 V, IO = 500 mA
5
mV
Load Regulation
VIN = 25 V, IO = 50 to 500mA
mV
Output Ripple
VIN = 25 V, IO = 500 mA
30
100
Efficiency
VIN = 25 V, IO = 500mA
VIN = 25 V, Rload = 0.1 Ω
80
%
1.2
A
Parameter
Line Regulation
ISC
Test Conditions
7
mV
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
8
1
DRC
SWC
Ipk
SWE
L1
7
RSC
0.22Ω
90μH
6
5
VIN
4.5 to 6V
C2
100μF
2
3
VCC
CII
TC
GND
+
4
D1
BYV10-40
C3
1.5nF
R2
R1
8.2kΩ
953kΩ
VOUT
-12V / 100mA
C1
1000μF
+
Figure 10. Voltage Inverting Converter
For VOUT = -12V
Result(Typ)
Unit
VIN = 4.5 to 6 V, IO = 100 mA
15
mV
Load Regulation
VIN = 5 V, IO = 10 to 100mA
mV
Output Ripple
VIN = 5 V, IO = 100 mA
20
230
Efficiency
VIN = 5 V, IO = 100mA
VIN = 5 V, Rload = 0.1 Ω
58
%
0.9
A
Patameter
Line Regulation
ISC
Test Conditions
8
mV
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
8
1
VOUT
Q2
S Q
+
Q1
R
2
7
Ipk
Oscillator
RSC
6
VIN
+
Comparator
3
1.25V
Reference
Regulator
4
_
5
Figure 11. Step-up with External NPN Switch
8
1
S Q
Q2
Q1
R
2
7
Ipk
Oscillator
RSC
3
VOUT
VIN
6
+
Comparator
1.25V
Reference
Regulator
+
4
_
5
Figure 12. Step-down with External NPN Switch
9
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
8
1
Q2
S Q
Q1
R
VOUT
2
+
7
Ipk
Oscillator
RSC
6
VIN
3
1.25V
Reference
Regulator
+
Comparator
4
_
5
Figure 13. Step-down with External PNP Switch
8
1
Q2
S Q
Q1
R
2
7
Ipk
Oscillator
RSC
3
VOUT
VIN
6
+
Comparator
1.25V
Reference
Regulator
4
_
5
Figure 14. Voltage Inverting with External NPN Switch
10
+
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
8
1
Q2
S Q
VOUT
Q1
R
2
+
7
Ipk
Oscillator
RSC
3
VIN
6
1.25V
Reference
Regulator
+
Comparator
4
_
5
Figure 15. Voltage Inverting with External PNP Saturated Switch
+12V
+
GND
+
8
1
S Q
Q2
Q1
R
2
7
Ipk
Oscillator
RSC
VIN
6
+
Comparator
3
1.25V
Reference
Regulator
4
_
5
Figure 16. Dual Output Voltage
11
-12V
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
+
+VOUT
Isolated from input
-VOUT
+
8
1
S Q
Q2
Q1
R
2
7
VIN
RSC
3
Ipk
Oscillator
6
+
Comparator
1.25V
Reference
Regulator
4
_
5
Figure 17. Higher Output Power, Higher Input Voltage
12
MC34063A
DC-TO-DC Converter Control Circuits
CALCULATION
Table 1 Design Formula Table
Calculation
ton/toff
Step-Up
Step-Down
Vout + VF - Vin(min)
Vin(min) - Vsat
1
f
(ton+toff)max
Voltage-Inverting
Vout + VF
Vin(min) - Vsat - Vout
|Vout | + VF
Vin - Vsat
1
f
1
f
toff
ton + toff
ton/toff + 1
ton + toff
ton/toff + 1
ton + toff
ton/toff + 1
ton
(ton + toff) - toff
(ton + toff) - toff
(ton + toff) - toff
CT
4.0×10 -5 ton
ton
2Iout(max) toff + 1
Ipk(switch)
RSC
L(min)
CO
(
I
)
2Iout(max)
0.3
0.3
PK(switch)
IPK(switch)
(Vin(min) - Vsat)
ton(max)
Ipk(switch)
≈
4.0×10 -5 ton
Ioutton
Vripple(p-p)
(Vin(min) - Vsat - Vout)
ton(max)
Ipk(switch)
Ipk(switch)(ton + toff)
8Vripple(p-p)
4.0×10 -5 ton
ton
2Iout(max) toff + 1
(
)
0.3
IPK(switch)
(Vin(min) - Vsat)
ton(max)
Ipk(switch)
≈
Ioutton
Vripple(p-p)
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 values of Vin and Io
Vripple(pp)=Desired peak-to-peak output ripple voltage.In prictice,the calculated capacitor value
will need to be increased due to its equivalent series resistance and board layout.
The ripple should be kept to a low value since it will directiy affect the line and load
regulation.
13
MC34063A
DC-TO-DC Converter Control Circuits
PHYSICAL DIMENSIONS
SOP8L
A3
A1
A2
1
B1
4
B
R2
3
2
A
R1
C3
C4
C2
C
C1
B2
D1
D
Symbol
A
A1
A2
A3
B
B1
B2
C
C1
C2
Dimension(mm)
Max
Min
4.95
0.37
5.15
0.47
1.27(TYP)
0.41(TYP)
5.80
6.20
4.00
3.80
5.0(TYP)
1.30
0.55
0.55
1.50
0.65
0.65
Symbol
C3
C4
D
D1
R1
R2
1
2
3
4
14
Dimension(mm)
Min
Max
0.05
0.20
0.20(TYP)
1.05(TYP)
0.40
0.60
0.07(TYP)
0.07(TYP)
17 (TYP)
13 (TYP)
4 (TYP)
12 (TYP)
MC34063A
DC-TO-DC Converter Control Circuits
DIP8L
A
D2
1
B
2
3
D1
C2
C3
C
C1
C4
D
A5
A3
A4
A1
A2
Symbol
A
Dimension(mm)
Min
Max
9.30
9.50
A1
A2
Symbol
Min
1.524(TYP)
0.39
Dimension(mm)
0.53
Max
C2
0.5(TYP)
C3
3.3(TYP)
C4
1.57(TYP)
A3
2.54(TYP)
D
8.20
8.80
A4
0.66(TYP)
D1
0.20
0.35
A5
0.99(TYP)
D2
7.62
7.87
B
6.3
7.20(TYP)
C
C1
6.5
3.30
3.50
15
1
8 (TYP)
2
8 (TYP)
3
5 (TYP)
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