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MC34063A 데이터시트 PDF




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부품번호 MC34063A 기능
기능 (MC33063A / MC34063A) Step-Up/Down/ Inverting Switching Regulators
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MC34063A 데이터시트, 핀배열, 회로
MC34063A, MC33063A,
NCV33063A
1.5 A, Step−Up/Down/
Inverting Switching
Regulators
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.
Features
Operation from 3.0 V to 40 V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.5 A
Output Voltage Adjustable
Frequency Operation to 100 kHz
Precision 2% Reference
Pb−Free Packages are Available
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Drive 8
Collector
Ipk 7
Sense
6
VCC
Comparator 5
Inverting
Input
S Q Q2
R
100
Q1
Ipk
Oscillator
CT
Comparator
+ 1.25 V
Reference
Regulator
1
Switch
Collector
2 Switch
Emitter
3 Timing
Capacitor
4
GND
(Bottom View)
This device contains 51 active transistors.
Figure 1. Representative Schematic Diagram
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8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
3x063
ALYWA
G
1
8
1
PDIP−8
P, P1 SUFFIX
CASE 626
8
3x063AP1
AWL
YYWWG
1
8
33063AVP
AWL
YYWWG
1
x
A
L, WL
Y, YY
W, WW
G or G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
Switch
Collector
Switch
Emitter
1
2
Timing 3
Capacitor
GND 4
8
Driver
Collector
7 Ipk Sense
(Top View)
6 VCC
Comparator
5 Inverting
Input
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
© Semiconductor Components Industries, LLC, 2007
February, 2007 − Rev. 19
1
Publication Order Number:
MC34063A/D




MC34063A pdf, 반도체, 판매, 대치품
MC34063A, MC33063A, NCV33063A
1000
500 VCC = 5.0 V
200
Pin 7 = VCC
Pin 5 = GND
100 TA = 25°C
50
ton
20
10
5.0 toff
2.0
1.0
0.01 0.02 0.05 0.1 0.2
0.5 1.0 2.0
CT, OSCILLATOR TIMING CAPACITOR (nF)
5.0 10
Figure 2. Output Switch On−Off Time versus
Oscillator Timing Capacitor
1.8
1.7
1.6
1.5
1.4
1.3
VCC = 5.0 V
1.2 Pins 1, 7, 8 = VCC
Pins 3, 5 = GND
1.1 TA = 25°C
(See Note 7)
1.0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IE, EMITTER CURRENT (A)
Figure 4. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
VCC = 5.0 V
Pin 7 = VCC
Pin 2 = GND
Pins 1, 5, 8 = Open
CT = 1.0 nF
TA = 25°C
10 ms/DIV
Figure 3. Timing Capacitor Waveform
1.1
1.0
0.9 Darlington Connection
0.8
0.7
0.6 VCC = 5.0 V
0.5 Pin 7 = VCC
0.4
Pins 2, 3, 5 = GND
TA = 25°C
0.3 (See Note 7)
Forced b = 20
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IC, COLLECTOR CURRENT(A)
Figure 5. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
400
380
360
VCC = 5.0 V
Ichg = Idischg
340
320
300
280
260
240
220
200
−55
−25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
Figure 6. Current Limit Sense Voltage
versus Temperature
125
3.6
3.2
2.8
2.4
2.0
1.6
1.2 CT = 1.0 nF
0.8 Pin 7 = VCC
Pin 2 = GND
0.4
0
0 5.0 10 15 20 25 30 35 40
VCC, SUPPLY VOLTAGE (V)
Figure 7. Standby Supply Current versus
Supply Voltage
7. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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MC34063A 전자부품, 판매, 대치품
MC34063A, MC33063A, NCV33063A
81
7
Rsc
0.33
Vin
25 V
100
6
+
5
SQ
R
Q2
Q1
Ipk
OSC
CT
VCC
+
Comp.
1.25 V
Ref
Reg
2
1N5819
3
CT L
220 mH
470
pF
4
R1 1.2 k
R2
3.6 k
Vout
5.0 V/500 mA
+
470 CO
1.0 mH
Vout
+
100
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
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
Vin = 25 V, RL = 0.1 W
Vin = 25 V, IO = 500 mA
Vin = 25 V, IO = 500 mA
Figure 10. Step−Down Converter
Results
12 mV = ±0.12%
3.0 mV = ±0.03%
120 mVpp
1.1 A
83.7%
40 mVpp
8
7
Rsc
Vin 6
1
8
27
Vout
Rsc
Vin 6
1
V
2
Figure 11. External Current Boost Connections for IC Peak Greater than 1.5 A
11a. External NPN Switch
11b. External PNP Saturated Switch
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