Motorola MC34060AD, MC34060ADR2, MC34060AP, MC33060AP, MC33060AD Datasheet
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Order this document by MC34060A/D
The MC34060A is a low cost fixed frequency, pulse width modulation
control circuit designed primarily for single–ended SWITCHMODE power
supply control.
The MC34060A is specified over the commercial operating temperature
range of 0° to +70°C, and the MC33060A is specified over an automotive
temperature range of –40° to +85°C.
• Complete Pulse Width Modulation Control Circuitry
• On–Chip Oscillator with Master or Slave Operation
• On–Chip Error Amplifiers
• On–Chip 5.0 V Reference, 1.5% Accuracy
• Adjustable Dead–Time Control
• Uncommitted Output Transistor Rated to 200 mA Source or Sink
• Undervoltage Lockout
PRECISION SWITCHMODE
PULSE WIDTH MODULATOR
CONTROL CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
14
1
P SUFFIX
PLASTIC PACKAGE
CASE 646
PIN CONNECTIONS
Noninv
Input
Inv
Input
Compen/PWM
Comp Input
Dead–Time
Control
C
T
R
T
Ground
+
1
Error
12
Amp
–
2
3
0.1V
4
5
Oscillator
6
78
V
CC
(Top View)
MOTOROLA ANALOG IC DEVICE DATA
Error
Amp
5.0 V
ref
+
–
Q1
Noninv
14
Input
Inv
13
Input
V
12
ref
N.C.
11
V
10
CC
C
9
E
14
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
ORDERING INFORMATION
Operating
Device
MC34060AD
MC34060AP
MC33060AD
MC33060AP
Motorola, Inc. 1996 Rev 1
Temperature Range
TA = 0° to +70°C
TA = – 40° to +85°C
Package
SO–14
Plastic DIP
SO–14
Plastic DIP
1
MC34060A MC33060A
MAXIMUM RATINGS
noted.)
Power Supply Voltage V
Collector Output Voltage V
Collector Output Current (Note 1) I
Amplifier Input Voltage Range V
Power Dissipation @ TA ≤ 45°C P
Operating Junction Temperature T
Storage Temperature Range T
Operating Ambient Temperature Range
For MC34060A
For MC33060A
NOTES: 1. Maximum thermal limits must be observed.
(Full operating ambient temperature range applies, unless otherwise
Rating
THERMAL CHARACTERISTICS
Characteristics Symbol
Thermal Resistance, Junction–to–Ambient R
Derating Ambient Temperature T
θJA
A
Symbol Value Unit
CC
stg
T
C
C
in
D
J
A
P Suffix
Package
42 V
42 V
500 mA
–0.3 to +42 V
1000 mW
125 °C
–55 to +125 °C
0 to +70
–40 to +85
D Suffix
Package
80 120 °C/W
45 45 °C
°C
Unit
RECOMMENDED OPERATING CONDITIONS
Condition/Value Symbol Min Typ Max Unit
Power Supply Voltage V
Collector Output Voltage V
Collector Output Current I
Amplifier Input Voltage V
Current Into Feedback Terminal I
Reference Output Current I
Timing Resistor R
Timing Capacitor C
Oscillator Frequency f
PWM Input Voltage (Pins 3 and 4) – –0.3 – 5.3 V
ELECTRICAL CHARACTERISTICS (V
for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)
Characteristics
REFERENCE SECTION
Reference Voltage (IO = 1.0 mA, TA 25°C)
TA = T
TA = T
Line Regulation
(VCC = 7.0 V to 40 V, IO = 10 mA))
Load Regulation
(IO = 1.0 mA to 10 mA)
Short Circuit Output Current
(V
ref
low
low
= 0 V)
to T
to T
– MC34060A
high
– MC33060A
high
= 15 V, CT = 0.01 µF, RT = 12 kΩ, unless otherwise noted. For typical values TA = 25°C,
CC
CC
C
C
in
fb
ref
T
T
osc
Symbol Min Typ Max Unit
V
ref
Reg
line
Reg
load
I
SC
7.0 15 40 V
– 30 40 V
– – 200 mA
–0.3 – VCC –2 V
– – 0.3 mA
– – 10 mA
1.8 47 500 kΩ
0.00047 0.001 10 µF
1.0 25 200 kHz
4.925
4.9
4.85
– 2.0 25 mV
– 2.0 15 mV
15 35 75 mA
5.0
–
–
5.075
5.1
5.1
V
2
MOTOROLA ANALOG IC DEVICE DATA
MC34060A MC33060A
ELECTRICAL CHARACTERISTICS (V
= 15 V, CT = 0.01 µF, RT = 12 kΩ, unless otherwise noted. For typical values TA = 25°C,
CC
for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
OUTPUT SECTION
Collector Off–State Current
(VCC = 40 V, VCE = 40 V)
Emitter Off–State Current
(VCC = 40 V, VCE = 40 V, VE = 0 V)
Collector–Emitter Saturation Voltage (Note 2)
Common–Emitter
I
C(off)
I
) – – –100 µA
E(off
V
sat(C)
– 2.0 100 µA
–
1.1
(VE = 0 V, IC = 200 mA)
Emitter–Follower
(VC = 15 V, IE = –200 mA)
Output Voltage Rise T ime (TA = 25°C)
Common–Emitter (See Figure 12)
Emitter–Follower (See Figure 13)
Output Voltage Fall T ime (TA = 25°C)
Common–Emitter (See Figure 12
Emitter–Follower (See Figure 13)
V
sat(E)
–
t
r
–
–
t
r
–
–
1.5
100
100
40
40
ERROR AMPLIFIER SECTION
Input Offset Voltage
(V
O[Pin 3]
= 2.5 V)
Input Offset Current
(V
C[Pin 3]
= 2.5 V)
Input Bias current
(V
O[Pin 3]
= 2.5 V)
Input Common Mode Voltage Range
(VCC = 40 V)
Inverting Input Voltage Range V
Open–Loop Voltage Gain
(∆VO = 3.0 V, VO = 0.5 V to 3.5 V, RL = 2.0 kΩ)
Unity–Gain Crossover Frequency
(VO = 0.5 V to 3.5 V, RL = 2.0 kΩ)
Phase Margin at Unity–Gain
(VO = 0.5 V to 3.5 V, RL = 2.0 kΩ)
Common Mode Rejection Ratio
V
IO
I
IO
I
IB
V
ICR
IR(INV)
A
VOL
f
c
φ
m
– 2.0 10 mV
– 5.0 250 nA
– –0.1 –2.0 µA
0 to
– – V
VCC –2.0
–0.3 to
– – V
VCC–2.0
70 95 – dB
– 600 – kHz
– 65 – deg.
CMRR 65 90 – dB
(VCC = 40 V, Vin = 0 V to 38 V))
Power Supply Rejection Ratio
PSRR – 100 – dB
(∆VCC = 33 V, VO = 2.5 V, RL = 2.0 kΩ)
Output Sink Current
(V
O[Pin 3]
= 0.7 V)
Output Source Current
(V
NOTES: 2. Low duty cycle techniques are used during test to maintain junction temperature as close to ambient temperatures as possible.
O[Pin 3]
T
low
T
low
= 3.5 V)
= –40°C for MC33060A T
= 0°C for MC34060A T
= +85°C for MC33060A
high
= +70°Cfor MC34060A
high
IO– 0.3 0.7 – mA
IO+ –2.0 –4.0 – mA
1.5
2.5
200
200
100
100
V
ns
ns
MOTOROLA ANALOG IC DEVICE DATA
3
MC34060A MC33060A
ELECTRICAL CHARACTERISTICS
for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)
Characteristics
PWM COMPARATOR SECTION (Test circuit Figure 11)
Input Threshold Voltage
(Zero Duty Cycle)
Input Sink Current
(V
= 0.7 V)
[Pin 3]
DEAD–TIME CONTROL SECTION (Test circuit Figure 11)
Input Bias Current (Pin 4)
(Vin = 0 V to 5.25 V)
Maximum Output Duty Cycle
(Vin = 0 V, CT = 0.01 µF, RT = 12 kΩ)
(Vin = 0 V, CT = 0.001 µF, RT = 47 kΩ)
Input Threshold Voltage (Pin 4)
(Zero Duty Cycle)
(Maximum Duty Cycle)
OSCILLATOR SECTION
Frequency
(CT = 0.01 µF, RT = 12 kΩ, TA = 25°C)
TA = T
TA = T
(CT = 0.001 µF, RT = 47 kΩ)
Standard Deviation of Frequency*
(CT = 0.001 µF, RT = 47 kΩ)
Frequency Change with Voltage
(VCC = 7.0 V to 40 V)
Frequency Change with Temperature
(∆TA =T
(CT = 0.01 µF, RT = 12 kΩ)
UNDERVOLTAGE LOCKOUT SECTION
Turn–On Threshold (VCC increasing, I
Hysteresis V
TOTAL DEVICE
Standby Supply Current
(Pin 6 at V
(VCC = 15 V)
(VCC = 40 V)
Average Supply Current
(V
[Pin 4]
*Standard deviation is a measure of the statistical distribution about the mean as derived from the formula; σ =
to T
low
to T
low
to T
low
ref
= 2.0 V, CT = 0.001 µF, RT = 47 kΩ). See Figure 11.
– MC34060A
high
– MC33060A
high
)
high
, all other inputs and outputs open)
(VCC = 15 V, CT = 0.01 µF, RT = 12 kΩ, unless otherwise noted. For typical values TA = 25°C,
Symbol Min Typ Max Unit
= 1.0 mA) V
ref
V
TH
I
I
I
IB(DT)
DC
max
V
TH
f
osc
σf
osc
∆f
(∆V) – 0.5 2.0 %
osc
∆f
(∆T)
osc
th
H
I
CC
I
S
– 3.5 4.5 V
0.3 0.7 – mA
– –1.0 –10 µA
90
–
–
0
9.7
9.5
9.0
–
– 1.5 – %
–
–
4.0 4.7 5.5 V
50 150 300 mV
–
–
– 7.0 – mA
96
92
2.8
–
10.5
–
–
25
4.0
–
5.5
7.0
11.3
11.5
11.5
N
Σ (xn –x)
n – 1
N–1
100
%
–
V
3.3
–
kHz
–
%
–
–
mA
10
15
2
4
MOTOROLA ANALOG IC DEVICE DATA
MC34060A MC33060A
Figure 1. Block Diagram
R
T
C
T
Dead–Time
Control
6
5
4
12 3
Error Amp
1
Oscillator
0.12V
0.7V
≈
0.7mA
++
1
––
Feedback/PWM
Comparator Input
This device contains 46 active transistors.
Dead–Time
Comparator
–
+
–
+
PWM.
Comparator
2
Undervoltage
Lockout
13 14
Error Amp
2
Reference
Regulator
–
+
7 Gnd
10
12
V
TH
9
Q1
8
V
CC
Ref Out
Collector
Emitter
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, RT and CT. The approximate oscillator frequency is determined by:
^
1.2
RT • C
T
f
osc
For more information refer to Figure 3.
Output pulse width modulation is accomplished by comparison of the positive sawtooth waveform across capacitor CT 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
Feedback/P.W.M.
Comparator
Dead–Time Control
T
Output Q1,
Emitter
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.
MOTOROLA ANALOG IC DEVICE DATA
5
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