MC34063ACN [STMICROELECTRONICS]
DC-DC CONVERTER CONTROL CIRCUITS; DC- DC转换器控制电路
| 型号： | MC34063ACN |
| 厂家： | 
ST |
| 描述： | DC-DC CONVERTER CONTROL CIRCUITS |
| 文件： | 总15页 (文件大小：132K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MC34063A
DC-DC CONVERTER CONTROL CIRCUITS
■
OUTPUT SWITCH CURRENT IN EXCESS OF
1.5A
■
■
■
■
■
2% REFERENCE ACCURACY
LOW QUIESCENTCURRENT: 2.5mA (TYP.)
OPERATINGFROM 3V TO 40V
FREQUENCY OPERATION TO 100KHz
ACTIVE CURRENT LIMITING
DIP-8
DESCRIPTION
The MC34063A series is a monolithic control
circuit delivering the main functions for DC-DC
voltage converting.
The device contains an internal temperature
compensated reference, comparator, duty cycle
controlled oscillator with an active current limit
circuit, driver and high current output switch.
Output voltage is adjustable through two external
resistors with a 2% reference accuracy.
SO-8
Employing a minimum number of external
components the MC34063A devices series is
designed for
Step-Down, Step-Up and
Voltage-Invertingapplications.
BLOCK DIAGRAM
1/15
April 2000
MC34063A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
VCC
Vir
Power Supply Voltage
50
-0.3 to 40
40
Comparator Input Voltage Range
V
VSWC Switch Collector Voltage
VSWE Switch Emitter Voltage (VSWC = 40V)
V
40
V
VCE
Vdc
Idc
Switch Emitter to Collector Voltage
Driver Collector Voltage
Driver Collector Current
Switch Current
40
V
40
V
100
mA
A
ISW
Ptot
1.5
o
Plastic Package
Power Dissipation at Tamb = 25 C (for
)
1.25
W
(for SOIC Package)
0.625
Top
Operating Ambient Temperature Range (for AC SERIES)
(for AB SERIES)
0 to 70
- 40 to 85
oC
oC
Tstg
Storage Temperature Range
- 40 to 150
oC
Absolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
THERMAL DATA
Symbol
Parameter
DIP-8
SO-8
Unit
Rthj-amb Thermal Resistance Junction-ambient (*)
Max
100
160
oC/W
(*) This value depends from thermal design of PCB on which the device is mounted.
CONNECTION DIAGRAM
PIN CONNECTIONS
(top view)
Pin No
Symbol
SWC
SWE
TC
Name and Function
Switch Collector
1
2
3
4
5
6
7
8
Switch Emitter
Timing Capacitor
Ground
GND
CII
Comparator Inverting Input
Voltage Supply
Ipk Sense
VCC
Ipk
DRC
Voltage Driver Collector
ORDERING NUMBERS
Type
MC34063AB
DIP-8
SO-8
SO-8 (tape & reel)
MC34063ABD-TR
MC34063ABN
MC34063ACN
MC34063ABD
MC34063ACD
MC34063AC
MC34063ACD-TR
2/15
MC34063A
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, VCC = 5V, Ta = TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
Symbol
fOSC
Parameter
Frequency
Test Conditions
Vpin5 = 0 V CT = 1 nF Ta = 25 oC
Min.
24
Typ.
33
Max.
42
Unit
KHz
Ichg
Charge Currernt
VCC = 5 to 40V
VCC = 5 to 40V
Pin 7 = VCC
Ta = 25 oC
Ta = 25 oC
Ta = 25 oC
24
33
42
A
µ
Idischg
Discharge Current
140
5.2
200
6.2
260
7.5
A
µ
I
dischg/Ichg Discharge to Charge
Current Ratio
Vipk(sense) Current Limit Sense Voltage Ichg = Idischg
Ta = 25 oC
250
300
350
mV
OUTPUT SWITCH
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VCE(sat) Saturation Voltage,
Darlington Connection
ISW = 1 A Pins1, 8 connected
1
1.3
V
VCE(sat) Saturation Voltage
ISW = 1 A Rpin8 = 82 to V
,
CC
0.45
0.7
V
Ω
Forced ~ 20
β
hFE
DC Current Gain
ISW = 1 A
VCE = 5 V
Ta = 25 oC
50
120
IC(off)
Collector Off-StateCurrent
VCE = 40 V
0.01
100
µA
COMPARATOR
Symbol
Parameter
Threshold Voltage
Test Conditions
Min.
Typ.
Max.
Unit
Vth
Ta = 25 oC
1.225
1.21
1.25
1.275
1.29
V
V
Ta = TLOW to THIGH
Regline Threshold Voltage Line
Regulation
VCC = 3 to 40V
1
5
mV
IIB
Input Bias Current
VIN = 0 V
-5
-400
nA
TOTAL DEVICE
Symbol
Parameter
Supply Current
Test Conditions
VCC = 5 to 40V CT = 1 nF
Min.
Typ.
Max.
Unit
ICC
2.5
4
mA
Pin 7 = VCC Vpin5 > Vth Pin 2 = GND
Remaining pins open
NOTES:
1) Maximum package power dissipation limit must be observed.
2) TLOW = 0 oC, THIGH = 70 oC (AC series); TLOW = -40 oC, THIGH = 85 oC (AB series).
3) If Darlington configuration is not used, care must be taken to avoid deep saturation of output switch. The resulting switch-off time may be
adversely affected. In a Darlington configuration the following output driver condition is suggested:
Forced
β of output current switch = ICOUTPUT/(ICDRIVER - 1mA*) ≥ 10
* Current less due to a built in 1K antileakage resistor.
Ω
3/15
MC34063A
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output Saturation
Voltagevs Emitter Current
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
Common Emitter Configuration Output Switch
SaturationVoltage vs Collector Current
Darlington Configuration Collector Emitter
SaturationVoltage (VCE(sat)) vs Temperature
Power Collector Emitter Saturation Voltage
(VCE(sat)) vs Temperature
Current Limit Sense Voltage Voltage (Vipk) vs
Temperature
4/15
MC34063A
TYPICAL ELECTRICAL CHARACTERISTICS
(Continued)
Bias Current vs Temperature
Reference Voltage vs Temperature
Supply Current vs Temperature
Supply Current vs Input Voltage
5/15
MC34063A
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
Printed Demoboard
Symbol
Vout
GND
GND
Vin
Pin
1
2
3
4
Test Condition (VOUT = 28V)
Test
Conditions
IN = 8 to 16V, IO = 175 mA
Value (Typ.)
Unit
mV
mV
mV
%
Line Regulation
Load Regulation
Output Ripple
Efficency
V
V
V
V
30
10
IN = 12V, IO = 75 to 175 mA
IN = 12V, IO = 175 mA
IN = 12V, IO = 175 mA
300
89
6/15
MC34063A
Step-Down Converter
Printed Demoboard
Symbol
Vout
GND
GND
Vin
Pin
1
2
3
4
Test Condition (VOUT = 5V)
Test
Line Regulation
Load Regulation
Output Ripple
Efficency
Conditions
IN = 15 to 25V, IO = 500 mA
IN = 25V, IO = 50 to 500 mA
IN = 25V, IO = 500 mA
Value (Typ.)
Unit
mV
mV
mV
%
V
V
V
V
5
30
100
80
IN = 25V, IO = 500 mA
ISC
VIN = 25V, RLOAD = 0.1
1.2
A
Ω
7/15
MC34063A
VoltageInvertingConverter
Printed Demoboard
Symbol
Vout
GND
GND
Vin
Pin
1
2
3
4
Test Condition (VOUT = -12V)
Test
Line Regulation
Load Regulation
Output Ripple
Efficency
Conditions
IN = 4.5 to 6V, IO = 100 mA
Value (Typ.)
Unit
mV
mV
mV
%
V
V
V
V
15
20
IN = 5V, IO = 10 to 100 mA
IN = 5V, IO = 100 mA
IN = 5V, IO = 100 mA
230
58
ISC
VIN = 5V, RlLOAD = 0.1
0.9
A
Ω
8/15
MC34063A
Calculation
Parameter
Step-Up
Step-Down
Voltage Inverting
(Discontinuos mode)
(Continuos mode)
(Discontinuos mode)
ton/toff
V
out + VF − Vin(min)
Vin(min) − Vsat
V
out + VF
Vin(min) − Vsat − Vout
1/fmin
| Vout| + VF
V
in − Vsat
(ton + toff)max
CT
1/fmin
4.5x10-5ton
1/fmin
4.5x10-5ton
4.5x10-5ton
2Iout(max)[(ton/toff)+1]
0.3/IPK(switch)
IPK(switch)
RSC
2Iout(max)[(ton/toff)+1]
0.3/IPK(switch)
2Iout(max)
0.3/IPK(switch)
CO
I
out ton
IPK (switch) (ton + toff
8Vripple
)
Iout ton
Vripple p p
( − )
Vripple p p
( − )
(p− )
p
L(min)
Vin(min) − Vsat
IPK (switch)
Vin(min) − Vsat − Vout
Vin(min) − Vsat
IPK (switch)
ton(max)
ton (max)
ton (max)
IPK (switch)
NOTES:
V
sat = Saturationvoltage of the output switch
VF = Foward voltage drop of the output rectifier
THE FOLLOWING POWER SUPPLY CHARACTERISTICS MUST BE CHOSEN:
in = Nominal input voltage
V
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 = Desired peak to peak output ripple voltage. In practice, the calculaed capacitor value will and 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 directly affect the line and load regulation.
Step-up With External NPN Switch
9/15
MC34063A
Step-down With External NPN Switch
Step-down With External PNP Switch
10/15
MC34063A
VoltageInvertingWith ExternalNPN Switch
VoltageInvertingWith ExternalPNP Saturated Switch
11/15
MC34063A
Dual Output Voltage
Higher Output Power, Higher Input Voltage
12/15
MC34063A
Plastic DIP-8 MECHANICAL DATA
mm
inch
TYP.
0.130
DIM.
MIN.
TYP.
MAX.
MIN.
MAX.
A
a1
B
3.3
0.7
0.028
0.055
0.036
1.39
0.91
1.65
1.04
0.065
0.041
B1
b
0.5
0.020
b1
D
E
0.38
0.5
9.8
0.015
0.020
0.386
8.8
0.346
0.100
0.300
0.300
e
2.54
7.62
7.62
e3
e4
F
7.1
4.8
0.280
0.189
I
L
3.3
0.130
Z
0.44
1.6
0.017
0.063
P001F
13/15
MC34063A
SO-8 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
MIN.
MAX.
0.068
0.009
0.064
0.033
0.018
0.010
0.019
A
a1
a2
a3
b
0.1
0.003
0.65
0.35
0.19
0.25
0.025
0.013
0.007
0.010
b1
C
c1
D
45 (typ.)
4.8
5.8
5.0
6.2
0.188
0.228
0.196
0.244
E
e
1.27
3.81
0.050
0.150
e3
F
3.8
0.4
4.0
1.27
0.6
0.14
0.157
0.050
0.023
L
0.015
M
S
8 (max.)
0016023
14/15
MC34063A
Information furnished isbelieved to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. Thispublication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
2000 STMicroelectronics – Printed in Italy – All Rights Reserved
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.
15/15
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