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MC33060A Arkusz danych(PDF) 5 Page - ON Semiconductor

Numer części MC33060A
Szczegółowy opis  Fixed Frequency, PWM, Voltage Mode Single Ended Controllers
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC33060A Arkusz danych(HTML) 5 Page - ON Semiconductor

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MC34060A, MC33060A
http://onsemi.com
5
Figure 1. Block Diagram
+
6
5
4
RT
CT
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
VCC
Error Amp
1
Feedback/PWM
Comparator Input
Error Amp
2
+
++
-
-
--
Emitter
Collector
+
-
VTH
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,
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


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