DC-DC Converter Control Circuits
MC34063A
BLOCK DIAGRAM
Driver
8
Collector
Switch
1
Collector
s
Q
Q2
Q1
R
Switch
Emitter
Ipk Sense
7
2
Timing
Ipk Oscillator
3
4
Capacitor
Vcc
6
Comparator
1.25V
+
Reference
Regulator
GND
-
Comparator
lnverting
5
input
THERMAL DATA
SYMBOL
DIP-8
100
SOP-8
PARAMETER
UNIT
Thermal Resistance Junction-ambient (*)
Rthi-amb
160
℃/w
Max
(*) This Value depends from thermal design of PCB on which the device is mounted.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
Vcc
PARAMETER
VALUE
UNIT
V
50
-0.3 to 40
40
Power Supply Voltage
Vir
V
Comparator input Voltage Range
Switch Collector Voltage
VSWC
VSWE
VCE
Vdc
V
40
V
Switch Emitter Voltage (VSWC=40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
40
V
40
V
Idc
100
Driver Collector Current
㎃
A
Isw
1.5
Switch Current
Ptot
1.25
W
Power Dissipation at Tamb=25℃(for Plastic Package)
(for SOIC Package)
0.625
-30 to +125
-40 to +150
Top
Tstg
Operating Ambient Temperature Range
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.
May. 2009 - Rev. 1.2
HTC
− 2 −
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
