DC-DC Converter Control Circuits
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output Saturation
Voltage vs Emitter Current
V
CE
(sat)
(V)
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.40
0
400
800
1200
I
E
(㎃)
0
0.01
0.1
1
100
V
CC
=5V
Pin1,7,8=V
CC
Pins3,5=GND
T
a
=25℃
MC34063A
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
T
on
T
off
(㎲)
200
150
V
CC
=5V
Pin7=V
CC
Pin5=GND
T
a
=25℃
T
on
50
T
off
C
T
(㎋)
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
V
CE
(sat)
(V)
1.0
0.8
0.6
0.4
0.2
0
0
400
800
1200
1
C
(㎃)
V
CC
=5V
Pin7=V
CC
Pins2,3,5=GND
T
a
=25℃
Forced β =20
Darlington Connection
Darlington Configuration Collector Emitter
Saturation Voltage (V
CE(sat)
) vs Temperature
V
CE
(sat)
(㎷)
1000
950
900
850
800
750
-40
V
CC
=5V
I
C
=1A
0
40
80
120
T
J
(℃)
Power Collector Emitter Ssturation Voltage
(V
CE(sat)
) vs Temperature
V
CE
(sat)
(㎷)
600
V
CC
=5V
550
500
450
400
350
-40
Current Limit Sense Voltage Voltage
(V
ipk
)
vs
Temperature
V
ipk
(㎷)
320
MC34063A
310
300
290
V
CC
=5V
280
270
-40
I
C
=1A
I
chg
=
I
dischg
0
40
80
120
T
J
(℃)
0
40
80
120
T
J
(℃)
May. 2009 - Rev. 1.2
HTC
−
4
−
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
