MC34063A Datasheet PDF - HTC

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MC34063A
HTC

Part Number MC34063A
Description DC-DC Converter Control Circuits
Page 11 Pages


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DC-DC Converter Control Circuits
MC34063A
FEATURES
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 3
MC34063AG is Halogen Free products
8 SOP/ 8 DIP PIN Configulation
SOP-8 PKG
DIP-8 PKG
APPLICATION
Battery Chargers
NICs / Switches / Hubs
ADSL Modems
Negative Voltage Power Supplies
Switch
Collector
1
Switch
Emitter
2
Timing
Capacitor
3
Ground 4
Driver
8 Collector
7 Ipk Sense
6 Vcc
5
Comparator
Inverting
Input
DESCRIPTION
ORDERING INFORMATION
Device
Package
MC34063AD
MC34063AGD
SOP-8
MC34063AN
DIP-8
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
1
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DC-DC Converter Control Circuits
BLOCK DIAGRAM
Driver
Collector
8
sQ
R
Switch
Q2 1 Collector
Q1
MC34063A
Ipk Sense 7
Vcc 6
Comparator
lnverting
5
input
Ipk Oscillator
Comparator
+
-
1.25V
Reference
Regulator
2
Switch
Emitter
3
Timing
Capacitor
4 GND
THERMAL DATA
SYMBOL
PARAMETER
Rthi-amb Thermal Resistance Junction-ambient (*)
(*) This Value depends from thermal design of PCB on which the device is mounted.
Max
DIP-8
100
SOP-8
160
UNIT
/w
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
Vcc
Vir
VSWC
VSWE
VCE
Vdc
Idc
Isw
Ptot
Power Supply Voltage
Comparator input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (VSWC=40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current
Switch Current
Power Dissipation at Tamb=25(for Plastic Package)
(for SOIC Package)
Top Operating Ambient Temperature Range
Tstg 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.
VALUE
50
-0.3 to 40
40
40
40
40
100
1.5
1.25
0.625
-30 to +125
-40 to +150
UNIT
V
V
V
V
V
V
A
W
May. 2009 - Rev. 1.2
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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
FOSC Frequency
Ichg Charge Current
Idischg Discharge Current
Idischg/Ichg Discharge to Charge Current Ratio
Vipk(sense) Current Limit Sense Voltage
OUTPUT SWITCH
SYMBOL
PARAMETER
VCE(sat) Saturation Voltage,
Darlington connection
VCE(sat) Saturation Voltage
hFE
IC(off)
DC Current Gain
Collector Off-State Current
TEST CONDITIONS
Vpin5= 0 V ,CT= 1nF ,Ta= 25oC
VCC= 5 to 40V ,Ta= 25oC
VCC= 5 to 40V ,Ta= 25oC
Pin 7= VCC ,Ta= 25oC
Ichg= Idischg ,Ta= 25oC
MIN.
24
24
140
5.2
250
TYP.
33
35
220
6.5
300
MAX. UNIT
42 KHz
42
260
7.5
350
TEST CONDITIONS
ISW= 1A ,Pins 1,8 connected
MIN. TYP. MAX. UNIT
1.0 1.3 V
ISW= 1A ,Rpin8= 82to VCC,
Forced β ~ 20
ISW= 1A, VCE= 5V, Ta= 25oC
VCE= 40V
0.45 0.7 V
50 75
0.01 100
COMPARATOR
SYMBOL
PARAMETER
Vth Threshold Voltage
Regline Threshold Voltage Line Regulation
IIB Input Bias Current
TEST CONDITIONS
Ta= 25oC
Ta= TLOW to THIGH
VCC= 3 to 40V
VIN= 0V
MIN.
1.225
1.21
TYP.
1.25
1
-5
MAX. UNIT
1.275 V
1.29 V
5
-400
TOTAL DEVICE
SYMBOL
PARAMETER
ICC Supply Current
TEST CONDITIONS
MIN.
VCC= 5 to 40V, CT=1
Pin7= VCC ,Vpin5>Vth, Pin2=GND
Remaining pins open
for MC34063A
TYP.
1.4
MAX. UNIT
4
Notes:
1) Maximum package power dissipation limit must be observed.
2) TLOW= '-30, THIGH= '+125
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 1Kantileakage resistor.
May. 2009 - Rev. 1.2
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DC-DC Converter Control Circuits
MC34063A
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output Saturation
Voltage vs Emitter Current
VCE(sat)
(V)
1.75
1.70
1.65
VCC=5V
Pin1,7,8=VCC
Pins3,5=GND
Ta=25℃
1.60
1.55
1.50
1.45
1.40
0
400
800 1200 IE(㎃)
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
Ton Toff
(㎲)
200 VCC=5V
Pin7=VCC
150 Pin5=GND
Ta=25℃
100
Ton
50 Toff
0
0.01
0.1
1 CT(㎋)
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
VCE(sat)
(V)
1.0
Darlington Connection
0.8
0.6
VCC=5V
Pin7=VCC
Pins2,3,5=GND
0.4 Ta=25℃
0.2
0
0
Forced β =20
400 800 1200 1C(㎃)
Darlington Configuration Collector Emitter
Saturation Voltage (VCE(sat)) vs Temperature
VCE(sat)
(㎷)
1000
VCC=5V
950 IC=1A
900
850
800
750
-40
0 40
80 120 TJ(℃)
Power Collector Emitter Ssturation Voltage
(VCE(sat)) vs Temperature
VCE(sat)
(㎷)
600
VCC=5V
550 IC=1A
500
450
400
350
-40 0 40 80 120 TJ(℃)
Current Limit Sense Voltage Voltage (Vipk) vs
Temperature
Vipk
(㎷)
320
MC34063A
310
300
290
280
VCC=5V
I Ichg= dischg
270
-40
0
40 80 120 TJ(℃)
May. 2009 - Rev. 1.2
4
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