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參數(shù)資料
| 型號： | MC33025P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Speed Double-Ended PWM Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 516K |
| 代理商： | MC33025P |
MC34025 MC33025
14
MOTOROLA ANALOG IC DEVICE DATA
Vref
R2
R1
CSS
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 Soft–Start current
is not affected by R1.
The new equation for Soft–Start 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.
Q
Q
T
Vin
To Current
Sense Input
RS
12
11
14
15
VC
Base Charge
Removal
0
–
+
IB
Figure 32. Bipolar Transistor Drive
The totem pole output can furnish negative base current for enhanced
transistor turn–off, with the addition of the capacitor in series with the base.
Q
Q
T
12
11
14
15
VC
Isolation
Boundary
Figure 33. Isolated MOSFET Drive
12
11
14
15
Q
Q
T
VC
VC
Figure 34. Direct Transformer 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.
Q
Q
T
Vin
To Current
Sense Input
RS
12
11
14
15
VC
Figure 35. MOSFET Parasitic Oscillations
A series gate resistor may be needed to damp high frequency parasitic
oscillation caused by a MOSFET’s input capacitance and any series wiring
inductance in the gate–source circuit. The series resistor will also decrease the
MOSFET’s 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.
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