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參數(shù)資料
| 型號： | MC34023 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Speed Single-Ended PWM Controller |
| 中文描述： | 高速單端PWM控制器 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 470K |
| 代理商： | MC34023 |
MC34023 MC33023
13
MOTOROLA ANALOG IC DEVICE DATA
Vref
R2
R1
CSS
1
2
8
+
Figure 30. 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.
Base Charge
Removal
Vin
To Current
Sense Input
RS
12
14
15
0
–
+
IB
VC
Figure 31. 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.
To Current
Sense Input
RS
12
14
15
VC
Vin
Figure 32. 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 gate–source 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
VC
Figure 33. 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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| MC34023P | 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 125 |
| MC33023DW | High Speed Single-Ended PWM Controller |
| MC33023P | High Speed Single-Ended PWM Controller |
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| MC3303D | QUAD DIFFERENTIAL INPUT OPERATIONAL AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC34023_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Single−Ended PWM Controller |
| MC34023P | 功能描述:電流型 PWM 控制器 Single Ended Voltage RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC34023PG | 功能描述:電流型 PWM 控制器 Single Ended Voltage or Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC34025 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double-Ended PWM Controller |
| MC34025_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Double−Ended PWM Controller |
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