MC34063AD [HTC]
DC-DC Converter Control Circuits; DC- DC转换器控制电路
| 型号： | MC34063AD |
| 厂家： | 
HTC KOREA TAEJIN TECHNOLOGY CO. |
| 描述： | DC-DC Converter Control Circuits |
| 文件： | 总11页 (文件大小：174K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DC-DC Converter Control Circuits
MC34063A
FEATURES
8 SOP/ 8 DIP PIN Configulation
OUTPUT SWITCH CURRENT IN EXCESS OF 1.5A
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2% REFERENCE ACCURACY
LOW QUIESCENT CURRENT:2.5mA(TYP.)
OPERATING FROM 3V TO 40V
FREQUENCY OPERATION TO 100KHz
ACTIVE CURRENT LIMITING
MOISTURE SENSITIVITY LEVEL 3
● MC34063AG is Halogen Free products
SOP-8 PKG
DIP-8 PKG
APPLICATION
Driver
Collector
Switch
Collector
8
1
2
Battery Chargers
●
●
●
●
NICs / Switches / Hubs
ADSL Modems
Switch
Emitter
Ipk Sense
Vcc
7
Negative Voltage Power Supplies
Timing
Capacitor
6
5
3
4
Comparator
Inverting
Input
Ground
ORDERING INFORMATION
Device
Package
SOP-8
DIP-8
MC34063AD
MC34063AGD
MC34063AN
DESCRIPTION
The MC34063A series is a monolithic control circuit delivering the main functions for DC-DC voltage
converting.
The device contains an intermal 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.
Employing a minimum number of external components the MC34063A devices series is designed for
Step-Down, Step-Up and Voltage-lnverting applications.
May. 2009 - Rev. 1.2
HTC
− 1 −
DC-DC Converter Control Circuits
MC34063A
BLOCK DIAGRAM
Driver
8
Collector
Switch
1
Collector
s
Q
Q2
Q1
R
Switch
Emitter
Ipk Sense
7
2
Timing
Ipk Oscillator
3
4
Capacitor
Vcc
6
Comparator
1.25V
+
Reference
Regulator
GND
-
Comparator
lnverting
5
input
THERMAL DATA
SYMBOL
DIP-8
100
SOP-8
PARAMETER
UNIT
Thermal Resistance Junction-ambient (*)
Rthi-amb
160
℃/w
Max
(*) This Value depends from thermal design of PCB on which the device is mounted.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
Vcc
PARAMETER
VALUE
UNIT
V
50
-0.3 to 40
40
Power Supply Voltage
Vir
V
Comparator input Voltage Range
Switch Collector Voltage
VSWC
VSWE
VCE
Vdc
V
40
V
Switch Emitter Voltage (VSWC=40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
40
V
40
V
Idc
100
Driver Collector Current
㎃
A
Isw
1.5
Switch Current
Ptot
1.25
W
Power Dissipation at Tamb=25℃(for Plastic Package)
(for SOIC Package)
0.625
-30 to +125
-40 to +150
Top
Tstg
Operating Ambient Temperature Range
Storage Temperature Range
℃
℃
Absolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
May. 2009 - Rev. 1.2
HTC
− 2 −
DC-DC Converter Control Circuits
MC34063A
ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC=5V, Ta=TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
SYMBOL
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
V
pin5= 0 V ,CT= 1nF ,Ta= 25oC
FOSC
24
24
33
35
42 KHz
Frequency
VCC= 5 to 40V ,Ta= 25oC
VCC= 5 to 40V ,Ta= 25oC
Pin 7= VCC ,Ta= 25oC
Ichg
42
260
7.5
㎂
㎂
Charge Current
Idischg
140
5.2
250
220
6.5
300
Discharge Current
I
dischg/Ichg
Discharge to Charge Current Ratio
Current Limit Sense Voltage
Vipk(sense)
350
㎷
I
chg= Idischg ,Ta= 25oC
OUTPUT SWITCH
SYMBOL
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
VCE(sat)
ISW= 1A ,Pins 1,8 connected
1.0
1.3
V
Saturation Voltage,
Darlington connection
Saturation Voltage
VCE(sat)
0.45
0.7
V
ISW= 1A ,Rpin8= 82Ω to VCC,
Forced β ~ 20
SW= 1A, VCE= 5V, Ta= 25oC
hFE
50
75
DC Current Gain
I
IC(off)
VCE= 40V
0.01
100
㎂
Collector Off-State Current
COMPARATOR
SYMBOL
Vth
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
Ta= 25oC
1.225 1.25 1.275
V
V
Threshold Voltage
Ta= TLOW to THIGH
VCC= 3 to 40V
VIN= 0V
1.21
1.29
5
Regline
IIB
1
Threshold Voltage Line Regulation
Input Bias Current
㎷
㎁
-5
-400
TOTAL DEVICE
SYMBOL
ICC
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
1.4
4
VCC= 5 to 40V, CT=1㎋
Pin7= VCC ,Vpin5>Vth, Pin2=GND
Remaining pins open
for MC34063A
Supply Current
㎃
Notes:
1) Maximum package power dissipation limit must be observed.
TLOW= '-30℃, THIGH= '+125℃
2)
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= CI OUTPUT/(ICDRIVER-1㎃*)≥10
* Current less due to a built in 1KΩ antileakage resistor.
May. 2009 - Rev. 1.2
HTC
− 3 −
DC-DC Converter Control Circuits
MC34063A
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output Saturation
Voltage vs Emitter Current
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
VCE(sat)
(V)
Ton Toff
(㎲)
1.75
VCC=5V
200
VCC=5V
Pin1,7,8=VCC
Pins3,5=GND
Ta=25℃
1.70
1.65
1.60
1.55
1.50
Pin7=VCC
Pin5=GND
Ta=25℃
150
100
50
Ton
Toff
1.45
1.40
0
IE(㎃)
0
400
1200
CT(㎋)
800
0.1
1
0.01
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
Darlington Configuration Collector Emitter
Saturation Voltage (VCE(sat)) vs Temperature
V
CE(sat)
(V)
V
CE(sat)
(㎷)
Darlington Connection
1.0
1000
VCC=5V
IC=1A
0.8
0.6
950
900
VCC=5V
Pin7=VCC
Pins2,3,5=GND
Ta=25℃
0.4
850
0.2
0
800
750
Forced β =20
0
400
800
1200
1C(㎃)
0
TJ(℃)
-40
40
120
80
Power Collector Emitter Ssturation Voltage
(VCE(sat)) vs Temperature
Current Limit Sense Voltage Voltage (Vipk) vs
Temperature
Vipk
V
CE(sat)
(㎷)
(㎷)
600
320
VCC=5V
IC=1A
MC34063A
550
310
300
500
450
290
VCC=5V
280
400
350
Ichg=Idischg
270
TJ(℃)
-40
0
40
80
120
-40
40
80
TJ(℃)
0
120
May. 2009 - Rev. 1.2
HTC
− 4 −
DC-DC Converter Control Circuits
MC34063A
TYPICAL ELECTRICAL CHARACTERISTICS (Continued)
Reference Voltage vs Temperature
Bias Current vs Temperature
Vref
(V)
IBias
(㎁)
1.265
10
8
VCC=5V
VCC=5V
1.260
CII to GND
1.255
1.250
6
4
2
0
1.245
1.240
-40
40
80
TJ(℃)
-40
0
120
40
80
TJ(℃)
0
120
Supply Current vs Temperature
Supply Current vs Input Voltage
ICC
(㎃)
ICC
(㎃)
4.0
5
TJ= 25℃
CT= 1㎋
3.5
VCC=5V
4
CT=1㎋
3.0
2.5
3
2
2.0
1.5
1
0
0
-40
20
30
40 Vin(V)
40
80
TJ(℃)
10
0
120
May. 2009 - Rev. 1.2
HTC
− 5 −
DC-DC Converter Control Circuits
MC34063A
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
L1
170μH
R3
1
2
8
DRC
SWC
SWE
TC
180Ω
7
D1
Ipk
BYV10-40
Rsc
6
5
3
4
Vcc
CII
0.22Ω
VIN
VOUT
C3
GND
+
C2
12V
25V/175㎃
1.5㎋
100㎌
MC34063A
R1
R2
+
2.2KΩ
44KΩ
C1
330㎌
Step-Down Converter
1
2
8
7
6
DRC
Ipk
SWC
SWE
TC
BYV10-40
Rsc
D1
0.33Ω
3
4
Vcc
CII
L
5
VIN
C3
GND
220μH
+
C2
25V
470㎊
100㎌
MC34063A
R1
R2
VOUT
+
1.2KΩ
3.5KΩ
C1
5V/0.5A
470㎌
May. 2009 - Rev. 1.2
HTC
− 6 −
DC-DC Converter Control Circuits
MC34063A
Step-Up With External NPN Switch
8
VOUT
1
Q2
S
R
Q
+
Q1
2
3
4
7
Rsc
Ipk Oscillator
6
5
VIN
comparator
1.25V
+
-
Reference
Regulator
Voltage Inverting Converter
1
8
DRC
SWC
L1
7
6
2
R3
Ipk
Vcc
CII
SWE
TC
0.22Ω
90μH
3
4
D1
5
BYV10-40
C3
VIN
GND
+
C2
1.5㎋
4.5V to 5V
100㎌
MC34063A
R2
R1
VOUT
8.2KΩ
953Ω
C1
-12V /100㎃
1000㎌
+
May. 2009 - Rev. 1.2
HTC
− 7 −
DC-DC Converter Control Circuits
MC34063A
Step-Down With External NPN Switch
8
1
Q2
S
R
Q
Q1
2
7
VOUT
3
4
Rsc
Ipk Oscillator
+
6
5
comparator
VIN
1.25V
+
-
Reference
Regulator
Step-Down With External PNP Switch
8
S
R
1
Q2
Q
Q1
VOUT
+
2
3
4
7
Rsc
Ipk Oscillator
VIN
6
5
comparator
1.25V
+
-
Reference
Regulator
May. 2009 - Rev. 1.2
HTC
− 8 −
DC-DC Converter Control Circuits
MC34063A
Voltage Inverting With External NPN Switch
8
1
S
R
Q
Q2
Q1
2
7
VOUT
Ipk Oscillator
Rsc
3
4
+
6
5
comparator
VIN
1.25V
+
-
Reference
Regulator
Voltage Inverting With External PNP Saturated Switch
8
1
Q2
S
R
Q
Q1
VOUT
+
2
3
4
7
Ipk Oscillator
Rsc
6
comparator
VIN
1.25V
+
-
Reference
Regulator
5
May. 2009 - Rev. 1.2
HTC
− 9 −
DC-DC Converter Control Circuits
MC34063A
Dual Output Voltage
+12V
+
+
GND
-12V
8
1
S
R
Q
Q2
Q1
2
7
Rsc
Ipk Oscillator
3
4
comparator
6
VIN
1.25V
+
-
Reference
Regulator
5
Higher Output Power, Higher Input Voltage
+VOUT
+
+
Isolated from input
-VOUT
8
1
S
R
Q
2
3
4
7
VIN
Ipk Oscillator
Rsc
comparator
6
5
1.25V
+
-
Reference
Regulator
May. 2009 - Rev. 1.2
HTC
− 10 −
DC-DC Converter Control Circuits
MC34063A
Design Formula Table
Calculation
Step-Up
Step-Down
Voltage-Inverting
Vout + VF - Vin(min)
Vin(min) - Vsat
Vout + VF
|Vout| + VF
Vin + Vsat
ton/toff
Vin(min) - Vsat
1
fmin
1
fmin
1
fmin
(ton/toff)max
4.0 X 10-5 ton
4.0 X 10-5 ton
4.0 X 10-5 ton
CT
ton
ton
Ipk(switch)
Rsc
2Iout(max)
+ 1
2Iout(max)
2Iout(max)
+ 1
(
)
(
)
toff
0.3 / Ipk(switch)
toff
0.3 / Ipk(switch)
0.3 / Ipk(switch)
Vin(min) - Vsat
Ipk(switch)
Vin(min)-Vsat-Vout
Vin(min) - Vsat
)
Ipk(switch)
x ton(max)
L(min)
x ton(max)
x ton(max)
(
)
(
)
(
Ipk(switch)
Iout ton
Vripple(pp)
Iout ton
Ipk(switch)(ton + toff)
8Vripple(pp)
Co
9
9
Vripple(pp)
TERMS AND DEFINITIONS
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.
Iout - Desired output current.
fmin- Minimum desired output switching frequency at the selected values of Vin and IO.
Vripple(p-p) – Desired peack-to-peack output ripple voltage. In practice the calculated capacitor value will need
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.
May. 2009 - Rev. 1.2
HTC
− 11 −
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