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PDF MC34060A Data sheet ( Hoja de datos )

Número de pieza MC34060A
Descripción Voltage Mode Single Ended Controllers
Fabricantes ON Semiconductor 
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1. MC34060A






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MC34060A, MC33060A
Fixed Frequency, PWM,
Voltage Mode Single Ended
Controllers
The MC34060A is a low cost fixed frequency, pulse width
modulation control circuit designed primarily for singleended
SWITCHMODEt 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.
Features
Complete Pulse Width Modulation Control Circuitry
OnChip Oscillator with Master or Slave Operation
OnChip Error Amplifiers
OnChip 5.0 V Reference, 1.5% Accuracy
Adjustable DeadTime Control
Uncommitted Output Transistor Rated to 200 mA Source or Sink
Undervoltage Lockout
These are PbFree and HalideFree Devices
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
http://onsemi.com
14
1
MARKING
DIAGRAMS
14
SOIC14
D SUFFIX
CASE 751A
MC3x060ADG
AWLYWW
1
14
1
14
PDIP14
P SUFFIX
CASE 646
1
MC3x060AP
AWLYYWWG
x
A
WL
Y, YY
WW
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbFree Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
(Top View)
© Semiconductor Components Industries, LLC, 2011
March, 2011 Rev. 7
1
Publication Order Number:
MC34060A/D

1 page




MC34060A pdf
MC34060A, MC33060A
6
RT
CT
5
Dead-Time 4
Control
Oscillator
0.12V
0.7V
0.7mA
+
1
-
Reference
Regulator
10
Dead-Time
- Comparator
+
-
+ PWM.
Comparator
+
2
-
Undervoltage
Lockout -
+
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.
Figure 1. Block Diagram
Description
The MC34060A is a fixedfrequency pulse width
modulation control circuit, incorporating the primary
building blocks required for the control of a switching power
supply (see Figure 1). An internallinear sawtooth oscillator
is frequencyprogrammable 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 controlsignal amplitude causes a corresponding
linear decrease of output pulse width. (Refer to the Timing
Diagram shown in Figure 2.)
Capacitor CT
Feedback/P.W.M.
Comparator
Dead-Time Control
Output Q1,
Emitter
Figure 2. Timing Diagram
http://onsemi.com
5

5 Page





MC34060A arduino
Vin = 8.0V to 26V
4.7k
+
50/35V
MC34060A, MC33060A
22k
0.05
33k
2.7M
3.9k
10
1
+
VCC
2
-
3
Comp
14
+
MC34060A
9
C
13
-
12
Vref
DT
4
4.7k
CT
5
0.001
390
8
E
7
GND
RT
6
47k
150mH @ 4.0A
MR850
20mH @ 1.0A
*
Vout
28V/
0.5A
300
0.1
470
Tip 111
+
470/
35V
+*
470/
35V
Test
Conditions
Line Regulation
Vin = 8.0 V to 26 V, IO = 0.5 A
Load Regulation
Vin = 12 V, IO = 1.0 mA to 0.5 A
Output Ripple
Vin = 12 V, IO = 0.5 A
Efficiency
Vin = 12 V, IO = 0.5 A
*Optional circuit to minimize output ripple
Results
40 mV 0.14%
5.0 mV 0.18%
24 mV pp P.A.R.D.
75%
Figure 20. StepUp Converter
http://onsemi.com
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