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MC34060ADR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MC34060A, MC33060A
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (continued) (V
CC
= 15 V, C
T
= 0.01 mF, R
T
= 12 kW, unless otherwise noted.
For typical values T
A
= 25°C, for min/max values T
A
is the operating ambient temperature range that applies, unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
PWM COMPARATOR SECTION (Test circuit Figure 11)
Input Threshold Voltage
(Zero Duty Cycle)
V
TH
− 3.5 4.5 V
Input Sink Current
(V
[Pin
3]
= 0.7 V)
I
I
0.3 0.7 − mA
DEAD−TIME CONTROL SECTION (Test circuit Figure 11)
Input Bias Current (Pin 4)
(V
in
= 0 V to 5.25 V)
I
IB(DT)
− −1.0 −10
mA
Maximum Output Duty Cycle
(V
in
= 0 V, C
T
= 0.01 mF, R
T
= 12 kW)
(V
in
= 0 V, C
T
= 0.001 mF, R
T
= 47 kW)
DC
max
90
−
96
92
100
−
%
Input Threshold Voltage (Pin 4)
(Zero Duty Cycle)
(Maximum Duty Cycle)
V
TH
−
0
2.8
−
3.3
−
V
OSCILLATOR SECTION
Frequency
(C
T
= 0.01 mF, R
T
= 12 kW, T
A
= 25°C)
T
A
= T
low
to T
high
− MC34060A
T
A
= T
low
to T
high
− MC33060A
(C
T
= 0.001 mF, R
T
= 47 kW)
f
osc
9.7
9.5
9.0
−
10.5
−
−
25
11.3
11.5
11.5
−
kHz
Standard Deviation of Frequency*
(C
T
= 0.001 mF, R
T
= 47 kW)
σf
osc
− 1.5 − %
Frequency Change with Voltage
(V
CC
= 7.0 V to 40 V)
Df
osc
(DV)
− 0.5 2.0 %
Frequency Change with Temperature
(DT
A
=T
low
to T
high
)
(C
T
= 0.01 mF, R
T
= 12 kW)
Df
osc
(DT)
−
−
4.0
−
−
−
%
UNDERVOLTAGE LOCKOUT SECTION
Turn−On Threshold (V
CC
increasing, I
ref
= 1.0 mA) V
th
4.0 4.7 5.5 V
Hysteresis V
H
50 150 300 mV
TOTAL DEVICE
Standby Supply Current
(Pin 6 at V
ref
, all other inputs and outputs open)
(V
CC
= 15 V)
(V
CC
= 40 V)
I
CC
−
−
5.5
7.0
10
15
mA
Average Supply Current
(V
[Pin
4]
= 2.0 V, C
T
= 0.001 mF, R
T
= 47 kW). See Figure 11.
I
S
− 7.0 − mA
*Standard deviation is a measure of the statistical distribution about the mean as derived from the formula; σ =
N
Σ (x
n
−x)
2
n − 1
N−1
MC34060A, MC33060A
http://onsemi.com
5
Figure 1. Block Diagram
+
6
5
4
R
T
C
T
Dead-Time
Control
Oscillator
0.12V
0.7V
≈ 0.7mA
1
12 3
2
Dead-Time
Comparator
PWM.
Comparator
13 14
Reference
Regulator
7 GND
10
12
9
8
Q1
Ref Out
V
CC
Error Amp
1
Feedback/PWM
Comparator Input
Error Amp
2
+
++
-
-
--
Emitter
Collector
+
-
V
TH
Undervoltage
Lockout
This device contains 46 active transistors.
Description
The MC34060A is a fixed−frequency pulse width
modulation control circuit, incorporating the primary
building blocks required for the control of a switching power
supply (see Figure 1). An internal−linear sawtooth oscillator
is frequency−programmable by two external components,
R
T
and C
T
. The approximate oscillator frequency is
determined by:
f
osc
^
1.2
R
T
• C
T
For more information refer to Figure 3.
Output pulse width modulation is accomplished by
comparison of the positive sawtooth waveform across
capacitor C
T
to either of two control signals. The output is
enabled only during that portion of time when the sawtooth
voltage is greater than the control signals. Therefore, an
increase in control−signal amplitude causes a corresponding
linear decrease of output pulse width. (Refer to the Timing
Diagram shown in Figure 2.)
Figure 2. Timing Diagram
Capacitor C
T
Feedback/P.W.M.
Comparator
Dead-Time Control
Output Q
1
,
Emitter
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 (V
CC
−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)
, OPEN LOOP VOLTAGE GAIN (dB)
VOL
A
VOL
q
1.0 10 100 1.0 k 10 k 100 k 1.0 M
θ
, EXCESS PHASE (DEGREES)
A
VCC = 15 V
DVO = 3.0
V
RL = 2.0 kW
DEAD-TIME CONTROL VOLTAGE (V)
PERCENT DUTY CYCLE (%)
0 1.0 2.0 3.0 3.5
V
CC
= 15 V
C
T
= 0.001
R
T
= 47 k
V
CC
= 15 V
R
T
, TIMING RESISTANCE (W)
, OSCILLATOR FREQUENCY (Hz)
osc
1.0 k 2.0 k 5.0 k 10 k 20 k 50 k 100 k 200 k 500 k
1.0 M
f
1.0 mF
0.001 mF
C
T
= 0.01 mF
f
osc
, OSCILLATOR FREQUENCY (Hz)
% DT, PERCENT DEAD‐TIME, Q1 OUTPUT
500 10 k 100 k 500 k
C
T
= 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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MC34060ADR2G

Mfr. #:
Buy MC34060ADR2G
Manufacturer:
ON Semiconductor
Description:
Switching Controllers High Performance Voltage Mode PWM
Lifecycle:
New from this manufacturer.
Delivery:
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