MC33060A Datasheet PDF - ON Semiconductor
Part Number | MC33060A | |
Description | Voltage Mode Single Ended Controllers | |
Manufacturers | ON Semiconductor | |
Logo | ||
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Fixed Frequency, PWM,
Voltage Mode Single Ended
Controllers
The MC34060A is a low cost fixed frequency, pulse width
modulation control circuit designed primarily for single−ended
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
• 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
• These are Pb−Free and Halide−Free 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
SOIC−14
D SUFFIX
CASE 751A
MC3x060ADG
AWLYWW
1
14
1
14
PDIP−14
P SUFFIX
CASE 646
1
MC3x060AP
AWLYYWWG
x
A
WL
Y, YY
WW
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free 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
|
|
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 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.)
Capacitor CT
Feedback/P.W.M.
Comparator
Dead-Time Control
Output Q1,
Emitter
Figure 2. Timing Diagram
http://onsemi.com
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Information | Total 16 Pages | |
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