DC-DC Converter Control Circuits
BLOCK DIAGRAM
Driver
Collector
MC34063A
8
s
R
Q
Q2
Q1
1
Switch
Collector
Ipk Sense
7
Ipk Oscillator
2
3
Switch
Emitter
Timing
Capacitor
Vcc
6
Comparator
+
-
Comparator
lnverting
input
1.25V
Reference
Regulator
4
GND
5
THERMAL DATA
SYMBOL
R
thi-amb
PARAMETER
Thermal Resistance Junction-ambient ( )
*
DIP-8
Max
100
SOP-8
160
UNIT
℃/w
(
*
) This Value depends from thermal design of PCB on which the device is mounted.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
cc
V
ir
V
SWC
V
SWE
V
CE
V
dc
I
dc
I
sw
P
tot
T
op
T
stg
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 T
amb
=25℃(for
Plastic Package)
(for
SOIC Package)
Operating Ambient Temperature Range
Storage Temperature Range
PARAMETER
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
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. ]
