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參數資料
| 型號： | MC33060APG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fixed Frequency, PWM, Voltage Mode Single Ended Controllers |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP14 |
| 封裝： | LEAD FREE, PDIP-14 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 197K |
| 代理商： | MC33060APG |
MC34060A, MC33060A
http://onsemi.com
5
Figure 1. Block Diagram
+
6
5
4
R
T
C
T
DeadTime
Control
Oscillator
0.12V
0.7V
≈
0.7mA
1
1
2
3
2
DeadTime
Comparator
PWM.
Comparator
13
Error Amp
2
14
Reference
Regulator
7
GND
10
12
9
8
Q1
Ref Out
V
CC
Error Amp
1
Feedback/PWM
Comparator Input
+
+
+
Emitter
Collector
+
V
TH
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,
R
T
and C
T
. The approximate oscillator frequency is
determined by:
f
osc
1.2
R
T
C
T
For more information refer to Figure 3.
Output pulse width modulation is accomplished by
comparison of the positive sawtooth waveform across
capacitor C
T
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
T
Feedback/P.W.M.
Comparator
DeadTime Control
Output Q
1
,
Emitter
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