MC34063A MC34063E
DC-DC CONVERTER CONTROL CIRCUITS
®
March 2001 s
OUTPUT SWITCH CURRENT IN EXCESS OF 1.5A
s 2% REFERENCE ACCURACY
s LOW QUIESCENT CURRENT: 2.5mA (TYP.)s OPERATING FROM 3V TO 40V
s FREQUENCY OPERATION TO 100KHz s
面袋ACTIVE CURRENT LIMITING
DESCRIPTION The MC34063A/E 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/E devices series is designed for Step-Down, Step-Up and
Voltage-Inverting applications.
BLOCK DIAGRAM
DIP-8
SO-8
1/15
ABSOLUTE MAXIMUM RATINGS
展频原理
Symbol Parameter
Value Unit V CC Power Supply Voltage
50V V ir Comparator Input Voltage Range -0.3 to 40
V V SWC Switch Collector Voltage
40V V SWE Switch Emitter Voltage (VSWC = 40V)40V V CE Switch Collector toEmitter Voltage 40V V dc Driver Collector Voltage 40V I dc Driver Collector Current 100mA I SW Switch Current
1.5A P tot Power Dissipation at T amb = 25 o C (for Plastic Package ) (for SOIC Package )
1.250.625W
T op
Operating Ambient Temperature Range (for AC and EC SERIES ) (for AB SERIES ) (for EB SERIES )0 to 70- 40 to 85- 40 to 125o C o
C o C
T stg Storage Temperature Range
- 40 to 150
o
C
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-8SO-8Unit
R thj-amb Thermal Resistance Junction-ambient (*) Max
100
160
o
C/W
(*) This value depends from thermal design of PCB on which the device is mounted.
ORDERING NUMBERS
Type
SO-8
SO-8 (tape & reel)MC34063AB (*)MC34063ABN MC34063ABD MC34063ABD-TR MC34063AC (*)MC34063ACN MC34063ACD MC34063ACD-TR MC34063EB MC34063EBN MC34063EBD MC34063EBD-TR MC34063EC
MC34063ECN
MC34063ECD
MC34063ECD-TR
(*) The "A" version is not recommended for new designs.
CONNECTION DIAGRAM
(top view)PIN CONNECTIONS
Pin No Symbol Name and Function 1SWC Switch Collector 2SWE Switch Emitter 3TC Timing Capacitor 4GND Ground
5CII Comparator Inverting Input 6V CC Voltage Supply 7I pk I pk Sense
8
DRC
Voltage Driver Collector
MC34063A/E
2/15
大肠杆菌培养ELECTRICAL CHARACTERISTICS (Refer to the test circuits, V CC = 5V, T a = T LOW to T HIGH, unless otherwise specified, see note 2)
OSCILLATOR
Symbol Parameter Test Conditions Min.Typ.Max.Unit
f OSC Frequency V pin5 = 0 V C T = 1 nF T a = 25 o C243342KHz
I chg Charge Currernt V CC = 5 to 40 V T a = 25 o C 243342µA
I dischg Discharge Current V CC = 5 to 40 V T a = 25 o C140200260µA I dischg/I chg Discharge to Charge
Current Ratio
Pin 7 = V CC T a = 25 o C 5.2 6.27.5
V ipk(sense)Current Limit Sense Voltage I chg = I dischg T a = 25 o C250300350mV OUTPUT SWITCH
Symbol Parameter Test Conditions Min.Typ.Max.Unit V CE(sat)Saturation Voltage,
Darlington Connection
I SW = 1 A Pins 1, 8 connected1 1.3V
V CE(sat)Saturation Voltage I SW = 1 A R pin8 = 82 Ω to V CC,
Forced β ~ 20
0.450.7V
h FE DC Current Gain I SW = 1 A V CE = 5 V T a = 25 o C50120
I C(off)Collector Off-State Current V CE = 40 V0.01100µA COMPARATOR
Symbol Parameter Test Conditions Min.Typ.Max.Unit
V th Threshold Voltage T a = 25 o C
T a = T LOW to T HIGH 1.225
1.21
1.25 1.275
1.29
V
V
Reg line Threshold Voltage Line
Regulation
V CC = 3 to 40 V15mV
I IB Input Bias Current V IN = 0 V-5-400nA TOTAL DEVICE
Symbol Parameter Test Conditions Min.Typ.Max.Unit
I CC Supply Current V CC = 5 to 40 V C T = 1 nF
Pin 7 = V CC V pin5 > V th Pin 2 = GND
Remaining pins open
for MC34063A for MC34063E 2.5
1.5
4
4
mA
mA
钙锌复合
稳定剂V START-UP Start-up Voltage (note 4)T a = 25 o C C T = 1 µF Pin 5 = 0 Vfor MC34063A for MC34063E 2.1
1.5
V
V
NOTES:
1) Maximum package power dissipation limit must be observed.
2) T LOW = 0 o C, T HIGH = 70 o C (AC and EC series); T LOW = -40 o C, T HIGH = 85 o C (AB series); T LOW = -40 o C, T HIGH = 125 o C (EB 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 = I COUTPUT/(I CDRIVER - 1mA*) ≥ 10
* Current less due to a built in 1KΩ antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begins to work.
MC34063A/E
3/15
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current Power Collector Emitter Saturation Voltage (V CE(sat)
) vs Temperature Darlington Configuration Collector Emitter Saturation Voltage (V CE(sat)
) vs Temperature
Current Limit Sense Voltage Voltage (V ipk ) vs
Temperature
Emitter Follower Configuration Output Saturation
Voltage vs Emitter Current
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
TYPICAL ELECTRICAL CHARACTERISTICS MC34063A/E
4/15
Supply Current vs Temperature
Supply Current vs Input Voltage
Reference Voltage vs Temperature
Bias Current vs Temperature
TYPICAL ELECTRICAL CHARACTERISTICS (Continued)MC34063A/E
5/15
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
Printed Demoboard
Test Condition (V OUT = 28V)
Test Conditions
Value (Typ.)Unit
Line Regulation V IN = 8 to 16V, I O = 175 mA 30mV Load Regulation V IN = 12V, I O = 75 to 175 mA 10mV Output Ripple V IN = 12V, I O = 175 mA 300mV Efficency
V IN = 12V, I O = 175 mA
89
%
Symbol Pin Vout 1GND 2GND 3Vin
4
MC34063A/E
6/15
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