MC34063A MC33063A

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3

ELECTRICAL CHARACTERISTICS

Characteristics

Symbol

Min

Typ

Max

Unit

OSCILLATO

Threshold Voltage

1.225

1.21

1.25

—

1.275

1.29

V

MC33063A, MC34063A

MC33363V

Regline

—

—

1.4

1.4

5.0

6.0

mV

—

-20

-400

nA

TOTAL DEVICE

—

—

4.0

mA

NOTES:

3. Tlow =0℃ for MC34063A, -40℃ for MC33063A, AV

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 (≤300mA) and high driver

currents(

frequencies≥30kHz, 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:

*The 100Ω resistor in the emitter of the driver device requires about 7.0mA before the output switch conducts.

Figure 1. Output Switch On-Off Time Versus

Oscillator Timing Capacitor

Figure 2. Timing Capacitor Waveform