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參數資料
| 型號： | MC33025DWG |
| 廠商： | ON SEMICONDUCTOR |
| 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, PDSO16 |
| 封裝： | LEAD FREE, SOIC-16 |
| 文件頁數： | 14/20頁 |
| 文件大?。?/td> | 482K |
| 代理商： | MC33025DWG |
MC34025, MC33025
http://onsemi.com
14
V
ref
R
2
R
1
C
SS
1
2
8
+
Figure 32. 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.
Q
Q
T
V
in
To Current
Sense Input
R
S
12
11
14
15
V
C
Base Charge
Removal
0
+
I
B
Figure 33. 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.
Q
Q
T
12
11
14
15
V
C
Isolation
Boundary
Figure 34. Isolated MOSFET Drive
12
11
14
15
Q
Q
T
V
C
V
C
Figure 35. 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
V
in
To Current
Sense Input
R
S
12
11
14
15
V
C
Figure 36. 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 gatesource 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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| MC33025DWR2 | High Speed Double−Ended PWM Controller |
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| MC33025DWR2 | 功能描述:電流型 PWM 控制器 Dual Output Voltage RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33025DWR2G | 功能描述:電流型 PWM 控制器 Dual Output Voltage or Current Mode PWM RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33025P | 功能描述:電流型 PWM 控制器 Dual Output Voltage RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33025PG | 功能描述:電流型 PWM 控制器 Dual Output Voltage or Current Mode PWM RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33029 | 制造商:SPC Multicomp 功能描述:FAN POWER CORD 制造商:SPC Multicomp 功能描述:FAN POWER CORD; For Use With:Axial Fans; Voltage Rating:300V; Fan Side Connector:45 Angle Plug; Cable Length:120"; Accessory Type:Fan Power Cord; Equipment Side Connector:Blunt Cut Wire Leads; Supply Voltage:300V ;RoHS Compliant: Yes |
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