DC-DC Converter Control Circuits MC34063A/B

DC-DC Converter Control Circuits
MC34063A/B
FEATURES








SOP-8 PKG
Output Switch Current In Excess of 1.5A
2% Reference Accuracy
Low Quiescent Current : 2.5mA(Typ.)
Operating From 3V to 40V
Frequency Operation to 100KHz
Active Current Limiting
Moisture Sensitivity Level 3D
MC34063AG is Halogen Free Products
DIP-8 PKG
APPLICATION
ORDERING INFORMATION
 Battery Chargers
Device
 NICs / Switches / Hubs
MC34063AD
 ADSL Modems
MC34063AGD
 Negative Voltage Power Supplies
MC34063BD
Package
SOP-8
MC34063AN
DIP-8
DESCRIPTION
The MC34063A/B 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.
Employing a minimum number of external components the MC34063A/B devices series is designed for StepDown, Step-Up and Voltage-Inverting applications.
Absolute Maximum Ratings (Note 1)
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Power Supply Voltage
VCC
-
50
V
Comparator Input Voltage Range
VIR
-0.3
40
V
Switch Collector Voltage
VSWC
40
V
Switch Emitter Voltage(VSWC=40V)
VSWE
40
V
Switch Collector to Emitter Voltage
VCE
40
V
Driver Collector Voltage
Vdc
-
40
V
Idc
-
100
mA
ISW
-
1.5
A
Driver Collector Current
(Note 2)
Switch Current
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DC-DC Converter Control Circuits
MC34063A/B
Absolute Maximum Ratings (Continued)
CHARACTERISTIC
Power Dissipation (at TA = 25°C)
SYMBOL
MIN.
MAX.
UNIT
SOP-8
PDMAX_SOP-8
0.625
W
DIP-8
PDMAX_DIP-8
1.0
W
SOP-8
θJA-SOP-8
160
°C/W
DIP-8
θJA-DIP-8
100
°C/W
-40
150
°C
0
75
°C
-40
85
°C
-65
150
°C
Thermal Resistance(*)
Operating Junction Temperature Range
TJ
MC34063A
TAOPR
Operating Ambient Temperature Range
MC34063B
Storage Temperature Range
TSTG
Note 1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these
conditions is not implied.
(*) This value depends from thermal design of PCB on which the device is mounted.
Ordering Information
Operating Ambient Temperature(TAOPR) Range
Package
0℃~70℃
0℃~70℃
SOP8
-40℃~85℃
0℃~70℃
Order No.
Supplied As
Status
MC34063AD
Reel
Active
MC34063AGD
Reel
Contact us
MC34063BD
Reel
Active
MC34063AN
Tube
Active
MC34063BN
Tube
Active
DIP8
-40℃~85℃
MC 34063
Package Type
D : SOP8
N : DIP8
G
: Halogen Free
Blank : Pb Free
Green Mode
Temperature Range
A : 0℃~70℃
B : -40℃~85℃
Root Name
Product Code
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DC-DC Converter Control Circuits
MC34063A/B
PIN CONFIGURATION
1
8
1
8
2
7
2
7
3
6
3
6
4
5
4
5
SOP-8
DIP-8
PIN DESCRIPTION
SOP-8 / DIP-8 PKG
Pin No.
Name
Function
1
Switch Collector
Internal switch transistor collector
2
Switch Emitter
Internal switch transistor emitter
3
Timing Capacitor
Timing Capacitor to control the switching frequency
4
GND
Ground pin for all internal circuits
5
Comparator Inverting Input
Inverting input pin for internal comparator
6
VCC
Voltage supply
7
IPK Sense
8
Driver Collector
Peak Current Sense Input by monitoring the voltage drop across an
external I sense resistor to limit the peak current through the switch
Voltage driver collector
BLOCK DIAGRAM
Driver
Collector
8
S
1
Switch
Collector
2
Switch
Emitter
IPK
Oscillator
3
Timing
Capacitor
1.25V
Reference
Regulator
4
GND
Q
R
IPK Sense
VCC
July 2013 - Rev. 1.1
Q1
7
6
Comparator
+
Comparator
Inverting
Input
Q2
5
-3
-
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DC-DC Converter Control Circuits
MC34063A/B
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, VCC=5V, TA=TLOW to THIGH, unless otherwise specified, see note 2)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
OSCILLATOR
FOSC
Frequency
VPIN5=0V, CT=1nF, TA=25℃
24
33
42
KHz
ICHG
Charge Current
VCC=5 to 40V, TA=25℃
24
35
42
㎂
Discharge Current
VCC=5 to 40V, TA=25℃
140
220
260
㎂
IDISCHG/ICHG
Discharge to Charge Current Ratio
Pin 7= VCC, TA=25℃
5.2
6.5
7.5
VIPK(SENSE)
Current Limit Sense Voltage
ICHG=IDISCHG, TA=25℃
250
300
350
mV
IDISCHG
OUTPUT SWITCH
VCE(SAT)
Saturation Voltage,
Darlington connection
ISW=1A, Pins 1,8 connected
1.0
1.3
V
VCE(SAT)
Saturation Voltage
ISW=1A, RPIN8=82Ω to VCC,
Forced β ~ 20
0.45
0.7
V
DC Current Gain
ISW=1A, VCE=5V, TA=25℃
Collector Off-State Current
VCE= 40V
0.01
100
㎂
1.25
1.275
V
1.29
V
hFE
IC(OFF)
50
75
COMPARATOR
VTH
REGLINE
IIB
TA=25℃
1.225
TA=TLOW to THIGH
1.21
Threshold Voltage
Threshold Voltage Line Regulation
VCC= 3 to 40V
1
5
mV
Input Bias Current
VIN= 0V
-5
-400
nA
VCC= 5 to 40V, CT=1nF
Pin7= VCC, VPIN5>VTH, Pin2=GND
Remaining pins open
for MC34063A/B
1.4
4
mA
TOTAL DEVICE
ICC
Supply Current
Note 1. Maximum package power dissipation limit must be observed.
Note 2. TLOW= '-30℃, THIGH= '+125℃
Note 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 switch :
Ι C(OUTPUT)
Ι C(DRIVER) - 7.0mΑ *
≥10
* Currentless due to a built in 1KΩ anti-leakage resistor
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DC-DC Converter Control Circuits
MC34063A/B
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output
Output Switch ON-OFF Time
Saturation Voltage vs. Emitter Current
vs. Oscillator Timing Capacitor
Common Emitter Configuration Output Switch
Darlington Configuration Collector Emitter
Saturation Voltage vs. Collector Current
Saturation Voltage (VCE(SAT)) vs. Temperature
Power Collector Emitter Saturation
Current Limit Sense Voltage (VIPK)
Voltage (VCE(SAT)) vs, Temperature
vs. Temperature
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DC-DC Converter Control Circuits
MC34063A/B
TYPICAL ELECTRICAL CHARACTERISTICS (Continued)
Reference Voltage vs. Temperature
Bias Current vs. Temperature
Supply Current vs. Temperature
Supply Current vs. Input Voltage
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DC-DC Converter Control Circuits
MC34063A/B
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
L1
170uH
R3
180Ω
8
1
DRC
SWC
IPK
SWE
7
RSC
0.22Ω
2
6
VCC
TC
5
12V
4
CII
VIN
GND
VOUT
C3
1.5nF
+
C2
100uF
D1
BYV10-40
3
25V / 175mA
MC34063A/B
R1
2.2kΩ
+
R2
44kΩ
C1
330uF
Step-Down Converter
8
1
DRC
SWC
7
RSC
0.33Ω
IPK
SWE
6
3
VCC
TC
5
25V
C2
100uF
July 2013 - Rev. 1.1
GND
+
R1
1.2kΩ
L1
220uH
4
CII
VIN
D1
BYV10-40
2
C3
470pF
+
R2
3.6kΩ
-7
-
VOUT
C1
470uF
5V / 0.5A
HTC
DC-DC Converter Control Circuits
MC34063A/B
Step-Up with External NPN Switch
8
S
Q
R
VOUT
1
Q2
+
Q1
2
7
RSC
VIN
IPK
Oscillator
3
1.25V
Reference
Regulator
4
6
Comparator
+
5
Voltage Inverting Converter
8
1
DRC
SWC
IPK
SWE
7
RSC
0.22O
2
6
3
VCC
TC
5
VIN
4.5V to 5V
GND
+
R1
8.2kO
July 2013 - Rev. 1.1
4
CII
C2
100uF
L1
90uH
C3
1.5nF
D1
BYV10-40
+
R2
953O
-8
-
VOUT
C1
1000uF
-12V / 100mA
HTC
DC-DC Converter Control Circuits
MC34063A/B
Step-Down with External NPN Switch
8
S
Q
1
Q2
R
Q1
2
7
IPK
Oscillator
RSC
VIN
3
VOUT
+
6
Comparator
1.25V
Reference
Regulator
+
-
4
5
Step-Down with External PNP Switch
8
S
Q
1
Q2
R
Q1
VOUT
+
2
7
RSC
VIN
IPK
Oscillator
3
1.25V
Reference
Regulator
4
6
Comparator
+
5
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DC-DC Converter Control Circuits
MC34063A/B
Voltage Inverting with External NPN Switch
8
S
Q
1
Q2
R
Q1
2
7
IPK
Oscillator
RSC
VIN
VOUT
3
+
6
Comparator
1.25V
Reference
Regulator
+
-
4
5
Voltage Inverting with External PNP Saturated Switch
8
S
Q
1
Q2
R
Q1
VOUT
+
2
7
RSC
VIN
IPK
Oscillator
3
1.25V
Reference
Regulator
4
6
Comparator
+
5
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DC-DC Converter Control Circuits
MC34063A/B
Dual Output Voltage
+12V
+
GND
8
+
S
Q
1
Q2
-12V
R
Q1
2
7
RSC
VIN
IPK
Oscillator
3
1.25V
Reference
Regulator
4
6
Comparator
+
5
Higher Output Power, Higher Input Voltage
+ VOUT
+
Isolated from input
- VOUT
8
+
S
Q
R
1
Q2
Q1
2
VIN
7
RSC
IPK
Oscillator
3
1.25V
Reference
Regulator
4
6
Comparator
+
5
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DC-DC Converter Control Circuits
MC34063A/B
Design Formula Table
Calculation
ton/toff
Step-UP
Step-Down
Voltage Inverting
VOUT  VF  VIN(MIN)
VOUT  VF
VIN(MIN)  VSAT
VOUT  VF
VIN(MIN)  VSAT
VIN  VSAT
1
1
1
f MIN
f MIN
f MIN
4.0  10 5 ton
4.0  10 5 ton
4.0  10 5 ton
(ton/toff)max
CT
2 IOUT(MAX)
IPK(SWITCH)
(
t off
 1)
t on
0.3 / I PK(SWITCH)
RSC
(
L(MIN)
VIN(MIN)  VSAT
)  t on(max)
I PK(SWITCH)
9
CO
I OUT t on
VRIPPLE(PP)
2 IOUT(MAX)
2 IOUT(MAX)
0.3 / I PK(SWITCH)
(
VIN(MIN)  VSAT  VOUT
I PK(SWITCH)
(
t off
 1)
t on
0.3 / I PK(SWITCH)
)  t on(max)
I PK(SWITCH) (t on  t off )
8VRIPPLE(PP)
(
VIN(MIN)  VSAT
I PK(SWITCH)
9
)  t on(max)
I OUT t on
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 peak-to-peak 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.
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