MC34063A MC33063A
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5.0 V, TA = Tlow to Thigh [Note 3], unless otherwise specified.)
Characteristics
COMPARATOR
Threshold Voltage
TA = 25°C
TA = Tlow to Thigh
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Input Bias Current (Vin = 0 V)
TOTAL DEVICE
Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,
VPin 5 > Vth, Pin 2 = Gnd, remaining pins open)
ICC
–
–
4.0
mA
Vth
1.225
1.21
Regline
–
–
IIB
–
1.4
1.4
– 20
5.0
6.0
– 400
nA
1.25
–
1.275
1.29
mV
V
Symbol
Min
Typ
Max
Unit
NOTES:
3. Tlow = 0°C for MC34063A, – 40°C for MC33063A, AV
Thigh = +70°C for MC34063A, + 85°C for MC33063A, +125°C for MC33063AV
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents (≥ 30 mA),
it may take up to 2.0
µs
for it to come out of saturation. This condition will shorten the off time at frequencies
≥
30 kHz, and is magnified at high
temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non–Darlington
configuration is used, the following output drive condition is recommended:
IC output
Forced
b
of output switch :
10
IC driver – 7.0 mA *
*The 100
Ω
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
w
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor
t on–off , OUTPUT SWITCH ON-OFF TIME (
µ
s)
1000
500
200
100
50
20
10
5.0
2.0
1.0
0.01 0.02
0.05 0.1 0.2
0.5 1.0 2.0
CT, OSCILLATOR TIMING CAPACITOR (nF)
5.0 10
toff
V OSC , OSCILLATOR VOLTAGE (V)
VCC = 5.0 V
Pin 7 = VCC
Pin 5 = Gnd
TA = 25°C
ton
Figure 2. Timing Capacitor Waveform
VCC = 5.0 V
Pin 7 = VCC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
CT = 1.0 nF
TA = 25°C
10
µs/DIV
MOTOROLA ANALOG IC DEVICE DATA
3
200 mV/DIV
ONSEMI [ ON SEMICONDUCTOR ]
