MC34060AP datasheet(6/16 Pages) ONSEMI

Part #	MC34060AP

Description	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers

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Manufacturer	ONSEMI [ON Semiconductor]

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MC34060A, MC33060A

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6

APPLICATIONS INFORMATION

The control signals are external inputs that can be fed into

the dead–time control, the error amplifier inputs, or the

feed–back input. The dead–time control comparator has an

effective 120 mV input offset which limits the minimum

output dead time to approximately the first 4% of the

sawtooth–cycle time. This would result in a maximum duty

cycle of 96%. Additional dead time may be imposed on the

output by setting the dead time–control input to a fixed

voltage, ranging between 0 V to 3.3 V.

The pulse width modulator comparator provides a means

for the error amplifiers to adjust the output pulse width from

the maximum percent on–time, established by the dead time

control input, down to zero, as the voltage at the feedback

pin varies from 0.5 V to 3.5 V. Both error amplifiers have a

common mode input range from –0.3 V to (VCC –2.0 V), and

may be used to sense power supply output voltage and

current. The error–amplifier outputs are active high and are

ORed together at the noninverting input of the pulse–width

modulator comparator. With this configuration, the

amplifier that demands minimum output on time, dominates

control of the loop.

The MC34060A has an internal 5.0 V reference capable

of sourcing up to 10 mA of load currents for external bias

circuits. The reference has an internal accuracy of

±5% with

a typical thermal drift of less than 50 mV over an operating

temperature range of 0

° to +70°C.

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