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參數(shù)資料
| 型號： | MC33023DWR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Speed Single−Ended PWM Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOIC-16 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大小： | 450K |
| 代理商： | MC33023DWR2G |
MC34023, MC33023
http://onsemi.com
14
V
ref
R
2
R
1
C
SS
1
2
8
+
Figure 31. Buffered Maximum Clamp Level
In voltage mode operation, the maximum duty cycle can be clamped. By
the addition of a PNP transistor to buffer the clamp voltage, the SoftStart
current is not affected by R
1
.
The new equation for SoftStart is
t
Vclamp
0.6
9.0
μ
A
(
CSS
)
In current mode operation, this circuit will limit the maximum voltage
allowed at the ramp input to end a cycle.
Base Charge
Removal
V
in
To Current
Sense Input
R
S
12
14
15
0
+
I
B
V
C
Figure 32. Bipolar Transistor Drive
The totem pole output can furnish negative base current for enhanced
transistor turnoff, with the addition of the capacitor in series with the base.
To Current
Sense Input
R
S
12
14
15
V
C
V
in
Figure 33. MOSFET Parasitic Oscillations
A series gate resistor may be needed to dampen high frequency parasitic
oscillation caused by the MOSFET’s input capacitance and any series
wiring inductance in the gatesource circuit. The series resistor will also
decrease the MOSFET switching speed. A Schottky diode can reduce
the driver’s power dissipation due to excessive ringing, by preventing the
output pin from being driven below ground. The Schottky diode also
prevents substrate injection when the output pin is driven below ground.
12
14
15
V
C
Figure 34. Isolated MOSFET Drive
The totem pole output can easily drive pulse transformers. A Schottky
diode is recommended when driving inductive loads at high frequencies.
The diode can reduce the driver’s power dissipation due to excessive
ringing, by preventing the output pin from being driven below ground.
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