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MC34063A Schematic ( PDF Datasheet ) - HTC

Teilenummer MC34063A
Beschreibung DC-DC Converter Control Circuits
Hersteller HTC
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Gesamt 10 Seiten
MC34063A Datasheet, Funktion
DC-DC Converter Control Circuits
MC34063A
● OUTPUT SWITCH CURRENT IN EXCESS OF
1.5A
2% REFERENCE ACCURACY
LOW QUIESCENT CURRENT:2.5mA(TYP.)
OPERATING FROM 3V TO 40V
REQUENCY OPERATION TO 100KHz
ACTIVE CURRENT LIMITING
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.
8 SOP/ 8 DIP PIN Configulation
Switch
Collector
Switch
Emitter
1
2
8
Drive
Collector
7 Ipk Sense
Timing
Capacitor
3
Ground 4
6 Vcc
5
Comparator
- Input
ORDERING INFORMATION
Device
Package
MC34063AD
8 SOP
MC34063AN
8 DIP
BLOCK DIAGRAM
Drive
Collector
8
sQ
R
Switch
Q2 1 Collector
Q1
Ipk Sense 7
Vcc 6
Comparator
lnverting
5
input
Ipk Oscillator
Comparator
+
-
1.25V
Reference
Regulator
2
Switch
Emitter
3
Timing
Capacitor
4 GND
HTC
1






MC34063A Datasheet, Funktion
DC-DC Converter Control Circuits
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
L1
170μH
R3 8
1
DRC
SWC
180Ω
7
2
Ipk SWE
Rsc 6
3
Vcc TC
0.22Ω
54
VIN
12V
C2 +
CII
GND
100㎌
MC34063A
R1 R2
2.2KΩ
44KΩ
MC34063A
C3
1.5㎋
D1
BYV10-40
VOUT
25V/175㎃
+C1
330㎌
Step-Down Converter
Rsc
0.33Ω
8
DRC
7
Ipk
6
Vcc
1
SWC
2
SWE
3
TC
BYV10-40
D1
54
L
VIN
25V
C2 +
CII
GND
C3
470㎊
220μH
100㎌
MC34063A
R1
1.2KΩ
R2
3.5KΩ
+C1
470㎌
VOUT
5V/0.5A
HTC
6

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