MC34063A.PDF

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MC34063A (6) EDIT
MC34063A, MC33063A
DC-to-DC Converter
Control Circuits
The MC34063A Series is a monolithic control circuit containing the
primary functions required for DC–to–DC converters. These devices
consist of an internal temperature compensated reference, comparator,
controlled duty cycle oscillator with an active current limit circuit,
driver and high current output switch. This series was specifically
designed to be incorporated in Step–Down and Step–Up and
Voltage–Inverting applications with a minimum number of external
components. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
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8
PDIP–8
P, P1 SUFFIX
CASE 626
1
•
Operation from 3.0 V to 40 V Input
•
Low Standby Current
SO–8
D SUFFIX
CASE 751
•
Current Limiting
8
•
Output Switch Current to 1.5 A
1
•
Output Voltage Adjustable
•
Frequency Operation to 100 kHz
•
Precision 2% Reference
8
SOEIAJ–8
M SUFFIX
CASE 968
1
PIN CONNECTIONS
Switch
Collector
Switch
Emitter
Timing
Capacitor
1
8
Driver
Collector
2
7
I pk Sense
Representative Schematic Diagram
3
6
V CC
Comparator
Inverting
Input
Drive
Collector
8
1
Switch
Collector
Gnd
4
5
SQ
Q2
(Top View)
Q1
R
7
I pk
Sense
100
2
Switch
Emitter
ORDERING INFORMATION
I pk
Oscillator
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
C T
6
3
Timing
Capacitor
V CC
Comparator
+
-
DEVICE MARKING INFORMATION
1.25 V
Reference
Regulator
See general marking information in the device marking
section on page 11 of this data sheet.
Comparator
Inverting
Input
5
4
Gnd
(Bottom View)
This device contains 51 active transistors.
W Semiconductor Components Industries, LLC, 2000
August, 2000 – Rev. 6
1
Publication Order Number:
MC34063A/D
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MC34063A, MC33063A
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
V CC
40
Vdc
Comparator Input Voltage Range
V IR
–0.3 to +40
Vdc
Switch Collector Voltage
V C(switch)
40
Vdc
Switch Emitter Voltage (V Pin 1 = 40 V)
V E(switch)
40
Vdc
Switch Collector to Emitter Voltage
V CE(switch)
40
Vdc
Driver Collector Voltage
V C(driver)
40
Vdc
Driver Collector Current (Note 1.)
I C(driver)
100
mA
Switch Current
I SW
1.5
A
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
T A = 25
P D
1.25
W
Thermal Resistance
R q JA
100
° C/W
SOIC Package, D Suffix
T A = 25 ° C
P D
625
W
Thermal Resistance
R q JA
160
°
C/W
Operating Junction Temperature
T J
+150
° C
Operating Ambient Temperature Range
T A
C
MC34063A
0 to +70
MC33063AV
–40 to +125
MC33063A
–40 to +85
Storage Temperature Range
T stg
–65 to +150
° C
1. Maximum package power dissipation limits must be observed.
2. ESD data available upon request.
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2
°
C
°
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MC34063A, MC33063A
ELECTRICAL CHARACTERISTICS (V CC = 5.0 V, T A = T low to T high [Note 3.], unless otherwise specified.)
Characteristics
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (V Pin 5 = 0 V, C T = 1.0 nF, T A = 25
°
C)
f osc
24
33
42
kHz
Charge Current (V CC = 5.0 V to 40 V, T A = 25 ° C)
I chg
24
35
42
m A
Discharge Current (V CC = 5.0 V to 40 V, T A = 25 ° C)
I dischg
140
220
260
m A
Discharge to Charge Current Ratio (Pin 7 to V CC , T A = 25
C)
I dischg /I chg
5.2
6.5
7.5
–
Current Limit Sense Voltage (I chg = I dischg , T A = 25 ° C)
V ipk(sense)
250
300
350
mV
OUTPUT SWITCH (Note 4.)
Saturation Voltage, Darlington Connection
(I SW = 1.0 A, Pins 1, 8 connected)
V CE(sat)
–
1.0
1.3
V
Saturation Voltage (Note 5.)
(I SW = 1.0 A, R Pin 8 = 82 W to V CC , Forced b 20)
V CE(sat)
–
0.45
0.7
V
DC Current Gain (I SW = 1.0 A, V CE = 5.0 V, T A = 25 ° C)
h FE
50
75
–
–
Collector Off–State Current (V CE = 40 V)
I C(off)
–
0.01
100
m
A
COMPARATOR
Threshold Voltage
T A = 25 ° C
T A = T low to T high
V th
V
1.225
1.21
1.25
–
1.275
1.29
Threshold Voltage Line Regulation (V CC = 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Reg line
mV
–
–
1.4
1.4
5.0
6.0
Input Bias Current (V in = 0 V)
I IB
–
–20
–400
nA
TOTAL DEVICE
Supply Current (V CC = 5.0 V to 40 V, C T = 1.0 nF, Pin 7 = V CC ,
V Pin 5 > V th , Pin 2 = Gnd, remaining pins open)
I CC
–
–
4.0
mA
3. T low = 0 ° C for MC34063A, –40 ° C for MC33063A, AV T high = +70 ° C for MC34063A, +85 ° C for MC33063A, +125 ° C for MC33063AV
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents ( 3 300 mA) and high driver currents
( . 30 mA), it may take up to 2.0 m s for it to come out of saturation. This condition will shorten the off time at frequencies . 30 kHz, 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 configuration is used, the following output drive condition is recommended:
Forced of output switch :
I C output
I C driver – 7.0 mA * 10
* The 100
W
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
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3
°
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MC34063A, MC33063A
1000
500
200
100
50
V CC = 5.0 V
Pin 7 = V CC
Pin 5 = Gnd
T A = 25 ° C
t on
20
10
5.0
2.0
1.0
t off
V CC = 5.0 V
Pin 7 = V CC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
C T = 1.0 nF
T A = 25 ° C
0.01 0.02
0.05 0.1
0.2
0.5 1.0
2.0
5.0 10
10 m s/DIV
C T , OSCILLATOR TIMING CAPACITOR (nF)
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor
Figure 2. Timing Capacitor Waveform
1.8
1.1
1.0
1.7
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Darlington Connection
1.6
1.5
1.4
V CC = 5.0 V
Pin 7 = V CC
Pins 2, 3, 5 = Gnd
T A = 25 ° C
(See Note 6.)
1.3
Forced b = 20
V CC = 5.0 V
Pins 1, 7, 8 = V CC
Pins 3, 5 = Gnd
T A = 25 ° C
(See Note 6.)
1.2
1.1
1.0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
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 Current
Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
400
380
360
340
320
300
280
260
240
220
200
3.6
3.2
V CC = 5.0 V
I chg = I dischg
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
C T = 1.0 nF
Pin 7 = V CC
Pin 2 = Gnd
-55
-25
0
25
50
75
100
125
0
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
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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4
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MC34063A, MC33063A
170 m H
L
8
1
180
SQ
R
Q2
Q1
7
2
1N5819
I pk
C T
R sc
0.22
Osc
3
V in
12 V
6
V CC
C T
+ 100
1.25 V
Ref
Reg
+
- Comp.
1500
pF
5
4
1.0 m H
R2
V out
28 V/175 mA
V out
47 k
+
+
R1 2.2 k
330
C O
100
Optional Filter
Test
Conditions
Results
Line Regulation
V in = 8.0 V to 16 V, I O = 175 mA
30 mV = ± 0.05%
Load Regulation
V in = 12 V, I O = 75 mA to 175 mA
10 mV =
±
0.017%
Output Ripple
V in = 12 V, I O = 175 mA
400 mVpp
Efficiency
V in = 12 V, I O = 175 mA
87.7%
Output Ripple With Optional Filter
V in = 12 V, I O = 175 mA
40 mVpp
Figure 7. Step–Up Converter
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