AIC MC34063A Dc/dc converter control circuit Datasheet

MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
! FEATURES
"
"
"
"
"
"
! DESCRIPTION
3V to 30V Input Voltage Operation.
Internal 1.6A Peak Current Switch.
The
"
by
Analog
Integrations
Corporation, an improved second source over the
Internal ±1.8% Reference.
Low Quiescent Current at 1.6mA.
Frequency Operation from 100Hz to 100KHz.
Current Limiting.
industrial standard MC34063A, is a monolithic
control circuit containing the primary functions
required
for
DC/DC
converters.
The
device
consists of an internal temperature compensated
reference,
! APPLICATIONS
"
MC34063A
comparator,
controlled
duty
cycle
oscillator with an active current limit circuit, driver
Saver for Cellular phones
DC-DC Converter Module
and high current output switch. This device is
specifically designed to be incorporated in stepdown, step-up and voltage-inverting applications
with a minimum number of external components.
The ±1.8% internal reference and low quiescent
current of 1.6mA are among the improvements of
the device over the competition.
! TYPICAL APPLICATION CIRCUIT
VOUT
200µH
D1
1N5819
*RS
VIN
6
5
+
C1
7
DRI
SC
IPK
SE
VCC
TC
CO
1
2
FB
GND
8.6V SAVER
*:Io=0.3/RS
3
4
CT
100µF
470pF
8
+
220µF
L
MC34063A
RB
RA
5.6K
33K
Saver Circuit for Cellular Phone
! ORDERING INFORMATION
MC34063A XX
ORDER NUMBER
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE
C: 0°C~+70°C
MC34063ACN
(PLASTIC DIP)
PIN CONFIGURATION
TOP VIEW
MC34063ACS
(PLASTIC SO)
SC 1
SE 2
TC
3
GND 4
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
8 DRI
7 IPK
6 VCC
5 FB
1
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
! ABSOLUTE MAXIMUM RATINGS
Supply Voltage
......................................................…………..................................... 30V
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage
..................................………….................... -0.3V~30V
.......................................……………......................................30V
..................................…………….............................................30V
Switch Collector to Emitter Voltage
Driver Collector Voltage
Switch Current
.....................…………..........................................30V
.................................……………............................................30V
............................................……………..............................................1.6A
Power Dissipation and Thermal Characteristics
DIP Package
Ta= 25°C
...............................………….............................1.0W
Thermal Resistance
.................……….......................100°C /W
SO Package
Ta= 25°C.................................…………….......................625mW
Thermal Resistance
.................……….......................160°C /W
Operating Junction Temperature ................................…………..….............................125°C
Operating Ambient Temperature Range
.................……...…...............................0°C~70°C
Storage Temperature Range .....................……………....…........................... - 65°C~150°C
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
2
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
! ELECTRICAL CHARACTERISTICS (VCC= 5V, Ta=25°°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Oscillator
Charging Current
5.0V≤VCC≤30V
ICHG
10
25
40
µA
Discharge Current
5.0V≤VCC≤30V
IDISCHG
100
150
200
µA
Voltage Swing
PIN 3
Discharge to Charge Current
Ratio
VIPK(SENSE) =VCC
Current Limit Sense Voltage
ICHG=IDISCHG
VOSC
0.6
IDISCHG/ ICHG
6.0
VIPK(SENSE)
250
V
300
350
mV
Output Switch
Saturation Voltage, Darlington
Connection
ISW =1.0A;
VC(DRIVER)=VC(SWITCH)
VCE(SAT)
1.0
1.3
V
Saturation Voltage
ISW =1.0A; IC(DRIVER)=50mA
(Forced β≅20)
VCE (SAT)
0.4
0.7
V
DC Current Gain
ISW =1.0A; VCE=5.0V
Collector Off-State Current
VCE=30V
hFE
35
IC(OFF)
120
10
nA
Comparator
Threshold Voltage
0°C≤Ta≤70°C
VFB
Threshold Voltage
1.227
1.25
1.273
V
1.29
V
1.21
Threshold Voltage Line
Regulation
3.0V≤VCC≤30V
REGLINE
0.1
0.3
mV/V
Input Bias Current
VIN=0V
IIB
0.4
1
µA
Supply current
VIPK(SENSE)=VCC
VPIN 5>VFB
5.0V≤VCC≤30V
CT=0.001µF, PIN 2=GND
Remaining pins open
ICC
1.6
3
mA
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
3
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
! TYPICAL
PERFORMANCE CHARACTERISTICS
1000
Standby Supply Current vs. Supply Voltage
2
ICC, Supply Current (mA)
VCC=5V
VIPK=VCC
PIN5=GND
100
ON TIME
10
OFF TIME
1.6
CT=1nF
VIPK=VCC
PIN 2=GND
1.2
0.8
0.4
1
tON-OFF Output Switch ON-OFF Time (µS)
Output Switch ON-OFF Time vs. Oscillator
Timing Capacitor
1
0.1
10
0
100
0
5
10
25
20
30
IPK Threshold Voltage vs Temperature
VFB, Threshold Voltage vs Temperature
350
1.3
VCC = 5V,
CT = 1nF
PIN 2 = GND
1.28
VCC = 5V
CT = 1nF
PIN 5 = GND
340
VIPK, Threshold Voltage (mV)
VFB, Threshold Voltage (V)
15
VCC, Supply Voltage (V)
CT, Oscillator Timing Capacitor (nF)
1.26
1.24
1.22
330
320
310
300
290
280
270
260
1.2
250
0
10
20
30
40
50
Temperature (°C)
60
70
80
0
VCE(SAT), Saturation Voltage (V)
VCE(SATE) Saturation Voltage (V)
1.4
1.6
1.5
1.4
1.3
30
40
50
60
70
80
Common-Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
1.8
1.7
20
Temperature (°C)
Emmiter-Follower Configuration Output Switch
Saturation Voltage vs Emmiter Current
VCC = 5V
PIN 1, 7, 8 = VCC
PIN 3, 5 = GND
10
VCC
5V
VCC == 5.0V
PIN
= VCC
PIN 77 =VCC
PINS2,2,3,3,55== GND
GND
PIN
Forced Beta = 20
1.2
1.0
Darlington Connection
0.8
0.6
0.4
Forced Beta = 20
0.2
0
1.2
0
0.5
1
1.5
0
0.5
1
1.5
IC, Collector Current (A)
IE, Emitter Current (A)
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
4
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
! BLOCK DIAGRAM
1
SC
8
Q2
DRI
QS
Q1
R
80
2
SE
7
IPK
IS
CT
Oscillator
TC
6
3
VCC
Comparator
1.25V
Reference
Voltage
GND
+
-
5
4
FB
! PIN DESCRIPTIONS
PIN 1: SC
- 1.6A switch collector
PIN 5: FB
PIN 2: SE
- Darlington switch emitter
PIN 6: VCC - Power supply input
PIN 3: TC
- Oscillator timing capacitor
PIN 7: IPK
- Highside current sense input,
VCC - VIPK=300mV
PIN 8: DRI
- Drive collector
PIN 4: GND - Power GND
- Feedback comparator inverting input
! APPLICATION INFORMATION
•
DESIGN FORMULA TABLE
CALCULATION
STEP-DOWN
STEP-UP
VOLTAGE-INVERTING
VOUT + VF
VIN(MIN) - VSAT - VOUT
1
FMIN
VOUT + VF - VIN(MIN)
VIN(MIN) - VSAT
1
FMIN
VOUT + VF
VIN - VSAT
1
FMIN
CT
4x10-5tON
4 x 10-5tON
4 x 10-5tON
IC (SWITCH)
2IOUT(MAX)
t ON
t OFF
(tON + tOFF) MAX
RS
L(MIN)
Co
2IOUT(MAX) (
0.33/IC(SWITCH)
VIN(MIN) - VSAT - VOUT
tON(MAX)
IC(SWITCH)
IC ( SWITCH) (t ON + t OFF)
8V RIPPLE ( P - P )
t ON + t OFF
)
t OFF
2IOUT(MAX) (
0.33/ IC (SWITCH)
VIN(MIN) - VSAT
tON(MAX)
IC(SWITCH)
IOUT tON
VRIPPLE(P - P)
t ON + t OFF
)
t OFF
0.33/ IC (SWITCH)
VIN(MIN) - VSAT
tON(MAX)
IC(SWITCH)
IOUT tON
VRIPPLE(P - P)
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
5
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
VSAT
VF
= Saturation voltage of the output switch.
= Forward voltage drop of the ringback rectifier
at the selected values for VIN and IOUT.
VRIPPLE (P-P)- Desired peak-to-peak output ripple voltage.
In practice, the calculated value will need to
be increased due to the capacitor equivalent
series resistance and board layout. The
ripple voltage should be kept to a low value
since it will directly effect the line and load
regulation.
The following power supply characteristics must be
chosen:
VIN
- Nominal input voltage.
VOUT
- Desired output voltage,
V OUT =1.25 (1 + RB/RA)
IOUT
- Minimum desired output switching frequency
FMIN
- Desired output current.
! APPLICATION EXAMPLES
VOUT
200µH
L
5V/500mA
+
8
RS
0.25
7
VIN
C1
6
5
+
DRI
CS 1
IPK
SE
VCC
TC
D1
1N5821
CO
470µF
2
3
4
FB
RB
470pF
CT
GND
100µF
3.6K
RA
1.2K
MC34063A
Line Regulation
VIN = 10V ~20V @ IO=500mA
40mV
Load Regulation
VIN = 15V, @ IO=10mA ~ 500mA
5mV
Short Circuit Current
VIN =15V, @ RL = 0.1Ω
1.3A
Fig. 1 Step-Down Converter
R1
CS 1
8 DRI
7
RS
VIN
6
5
+
C1
IPK
SE
VCC
TC
GND
FB
R2
Q1
2
3
L
4
CT
D1
+
VOUT
Co
MC34063A
RS
RB
Fig. 2 Step-Down Converter with External PNP Saturation Switch
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
6
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
! APPLICATION EXAMPLES (CONTINUED)
D1
200µH
L
RS
0.22
VIN
+ 100µF
C1
2V/200mA
1N5819
R1
150
8
VOUT
DRI
CS
7 IPK
SE
6 VCC
TC
5 FB
GND
+
CO
220µF
1
2
3
4
680pF
CT
MC34063A
RA
RB
2.2K
47K
Line Regulation
VIN = 8V ~16V @ IO=200mA
Load Regulation
VIN = 12V, @ IO=80mA ~ 200mA
100mV
5mV
Fig. 3 Step-Up Converter
D1
L
VOUT
R1
8
7
RS
VIN
6
+
5
C1
RA
DRI
CS 1
IPK
SE
TC
VCC
FB
GND
+
CO
2
Q
3
R2
4
CT
MC34063A
RB
Fig. 4 Step-Up Converter with External NPN Switch
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
7
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
! APPLICATION EXAMPLES (CONTINUED)
1
2
L
100µH
3
4
CT
680pF
D1
1N5819
VOUT
8
DRI
CS
IPK
SE
VCC
TC 6
7
RS
0.25
S
+
GND 5
FB
C1
100µF
VIN
4.5V~6V
MC34063A
-12V/100mA
+
RA
953
CO
470µF
RB
8.2K
Line Regulation
VIN = 4.5V ~6V @ IO=100mA
20mV
Load Regulation
VIN = 5V, @ IO=10mA ~ 100mA
100mV
Fig.5 Inverting Converter
R2
RS
VIN
+
8 DRI
CS 1
7 IPK
SE 2
6 VCC
TC 3
GND 4
5 FB
C1
R1
Q1
L
D1
CT
MC34063A
RA
RB
VOUT
CO
+
Fig 6. Voltage Inverting Converter With PNP Saturated Switch
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
8
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
!
PHYSICAL DIMENSIONS
"
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
H
E
e
e
A
A1
C
B
"
L
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
8 LEAD PLASTIC DIP (unit: mm)
D
E1
E
A2
A1
MIN
MAX
A1
0.381
—
A2
2.92
4.96
b
0.35
0.56
C
0.20
0.36
D
9.01
10.16
E
7.62
8.26
E1
6.09
7.12
C
L
e
eB
b
SYMBOL
e
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
9
Similar pages