MC34063A, MC33063A
t on-off , OUTPUT SWITCH ON OFF TIME (
µ
s)
1000
V OSC, OSCILLATOR VOLTAGE (V)
500
200
100
50
20
10
5.0
2.0
1.0
0.01 0.02
t
off
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 5 = Gnd
T
A
= 25°C
t
on
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
C
T
= 1.0 nF
T
A
= 25°C
10
µs/DIV
0.05 0.1 0.2
0.5 1.0 2.0
C
T
, OSCILLATOR TIMING CAPACITOR (nF)
5.0 10
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0
0.2
0.4
V
CC
= 5.0 V
Pins 1, 7, 8 = V
CC
Pins 3, 5 = Gnd
T
A
= 25°C
(See Note 6.)
0.6
0.8
1.0
1.2
I
E
, EMITTER CURRENT (A)
1.4
1.6
VCE(sat), SATURATION VOLTAGE (V)
VCE(sat), SATURATION VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Figure 2. Timing Capacitor Waveform
Darlington Connection
V
CC
= 5.0 V
Pin 7 = V
CC
Pins 2, 3, 5 = Gnd
T
A
= 25°C
(See Note 6.)
Forced
β
= 20
0
0.2
0.4
0.6
0.8
1.0
1.2
I
C
, COLLECTOR CURRENT(A)
1.4
1.6
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
VIPK(sense), CURRENT LIMIT SENSE VOLTAGE (V)
Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
3.6
400
380
360
340
320
300
280
260
240
220
200
-55
-25
0
25
50
75
T
A
, AMBIENT TEMPERATURE (°C)
100
125
I CC, SUPPLY CURRENT (mA)
V
CC
= 5.0 V
I
chg
= I
dischg
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
0
5.0
10
C
T
= 1.0 nF
Pin 7 = V
CC
Pin 2 = Gnd
15
20
25
30
V
CC
, SUPPLY VOLTAGE (V)
35
40
Figure 5. Current Limit Sense Voltage
versus Temperature
Figure 6. Standby Supply Current versus
Supply Voltage
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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4
200 mV/DIV
ONSEMI [ ON SEMICONDUCTOR ]
