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PDF MC34060A Data sheet ( Hoja de datos )
| Número de pieza | MC34060A | |
| Descripción | (MC33060A / MC34060A) PRECISION SWITCHMODE PULSE WIDTH MODULATOR CONTROL CIRCUIT | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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1. MC34060A  Hay una vista previa y un enlace de descarga de MC34060A (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Precision SWITCHMODE™
Pulse Width Modulator
Control Circuit
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
Order this document by MC34060A/D
MC34060A
MC33060A
PRECISION SWITCHMODE
PULSE WIDTH MODULATOR
CONTROL CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
14
1
P SUFFIX
PLASTIC PACKAGE
CASE 646
PIN CONNECTIONS
Noninv
Input 1
Inv
Input
2
Compen/PWM
Comp Input
3
Dead–Time
Control
4
+
Error
Amp
–
1
0.1V
+
Error
2 Amp
–
VCC
5.0 V
ref
Noninv
14 Input
13
Inv
Input
12 Vref
11 N.C.
CT 5
RT 6
Ground 7
Oscillator
10 VCC
9C
Q1
8E
(Top View)
MOTOROLA ANALOG IC DEVICE DATA
14
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34060AD
TA = 0° to +70°C
MC34060AP
SO–14
Plastic DIP
MC33060AD TA = – 40° to +85°C
MC33060AP
SO–14
Plastic DIP
© Motorola, Inc. 1996
Rev 1
1
1 page  
RT CT
6
5
Dead–Time 4
Control
MC34060A MC33060A
Figure 1. Block Diagram
Oscillator
0.12V
0.7V
≈ 0.7mA
+
1
–
Reference
Regulator
10
Dead–Time
– Comparator
+
Undervoltage
Lockout –
+
–
+ PWM.
Comparator
+
2
–
12
VTH
9
Q1 8
VCC
Ref Out
Collector
Emitter
12
Error Amp
1
3
Feedback/PWM
Comparator Input
13 14
Error Amp
2
7 Gnd
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, RT and CT. The approximate oscillator frequency is determined by:
^fosc
1.2
RT • CT
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 CT
Feedback/P.W.M.
Comparator
Dead–Time Control
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
5 Page 
MC34060A MC33060A
Figure 21. Step–Up/Down Voltage Inverting Converter
with Soft–Start and Current Limiting
Vin = 8.0V to 40V
+
50/50V
7.5k
Tip 32C
47
30k
0.01
47k
1.0M
0.01
10k
47k
1+
2
–
10
VCC
9
C
3
Comp
14
+
13
–
MC34060A
8
E
12
Vref
DT
10/16V 4
Gnd
CT RT
56
7
0.001
4.7k
47k
3.3k 820
75
MR851
20µH *
@ 1.0A
Vout
–15V/
0.25A
150µH
330/16V
@ 2.0A +
*
330/16V
+
1.0
Test
Conditions
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
Vin = 8.0 V to 40 V, IO = 250 mA
Vin = 12 V, IO = 1.0 to 250 mA
Vin = 12 V, IO = 250 mA
Vin = 12 V, RL = 0.1 Ω
Vin = 12 V, IO = 250 mA
* Optional circuit to minimize output ripple
Results
52 mV 0.35%
47 mV 0.32%
10 mV p–p P.A.R.D.
330 mA
86%
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MC34060A.PDF ] | |
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