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MC34060AP Datasheet(PDF) 6 Page - ON Semiconductor

Part # MC34060AP
Description  Fixed Frequency, PWM, Voltage Mode Single Ended Controllers
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC34060AP Datasheet(HTML) 6 Page - ON Semiconductor

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MC34060A, MC33060A
http://onsemi.com
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.
Figure 3. Oscillator Frequency
versus Timing Resistance
Figure 4. Open Loop Voltage Gain and Phase
versus Frequency
Figure 5. Percent Deadtime versus
Oscillator Frequency
Figure 6. Percent Duty Cycle versus
Dead−Time Control Voltage
f, FREQUENCY (Hz)
AVOL
q
1.0
10
100
1.0 k
10 k
100 k
1.0 M
VCC = 15 V
DVO = 3.0
V
RL = 2.0 k
W
DEAD−TIME CONTROL VOLTAGE (V)
0
1.0
2.0
3.0
3.5
VCC = 15 V
CT = 0.001
RT = 47 k
VCC = 15 V
RT, TIMING RESISTANCE (W)
1.0 k
2.0 k
5.0 k 10 k 20 k
50 k 100 k 200 k 500 k 1.0 M
1.0
mF
0.001
mF
CT = 0.01 mF
fosc, OSCILLATOR FREQUENCY (Hz)
500
10 k
100 k
500 k
CT = 0.001 mF
0.01
mF
1.0 k
100
90
80
70
60
50
40
30
20
10
0
100
80
60
40
20
0
500 k
100 k
10 k
1.0 k
500
20
18
16
14
12
10
8.0
6.0
4.0
2.0
0
110
120
−20
−40
−60
−80
−100
−120
−140
−160
−180
0


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