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參數(shù)資料
| 型號： | UC2845AAY |
| 廠商： | Microsemi Corporation |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 242K |
| 代理商： | UC2845AAY |
C
U R R E N T
M
O D E
PWM C
O N T R O L L E R
UC184xA/284xA/384xA
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1995
Rev. 1.2 12/95
6
P
R O D U C T I O N
D
A T A
S
H E E T
T Y P I C A L A P P L I C AT I O N C I R C U I T S
FIGURE 3.
— CURRENT SENSE SPIKE SUPPRESSION
FIGURE 4.
— MOSFET PARASITIC OSCILLATIONS
6
Q1
V
CC
DC BUS
5
R
S
R
1
UCx84xA
7
UCx84xA
3
5
6
7
R
S
C
Q1
V
CC
DC BUS
I
PK
I
PK(MAX)
=1.0V
R
S
CHANGE
FIGURE 5.
— EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT SYNCHRONIZATION
A resistor (R
) in series with the MOSFET gate will reduce overshoot
& ringing caused by the MOSFET input capacitance and any
inductance in series with the gate drive. (Note: It is very important to
have a low inductance ground path to insure correct operation of the
I.C. This can be done by making the ground paths as short and as
wide as possible.)
The RC low pass filter will eliminate the leading edge current spike
caused by parasitics of Power MOSFET.
f =
(R
A
+ 2R
B
)C
R
1.44
f =R
A
+ 2R
B
Precision duty cycle limiting as well as synchronizing several parts is
possible with the above circuitry.
2
6
7
R
B
R
A
5
1
8
4
3
555
TIMER
4
5
8
To other
UCx84xA devices
0.01
UCx84xA
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC2845AD | 功能描述:電流型 PWM 控制器 Current Mode 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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845AD1 | 功能描述:電流型 PWM 控制器 0.5mA Current Mode 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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845AD1013TR | 制造商:STMicroelectronics 功能描述: |
| UC2845AD8 | 功能描述:電流型 PWM 控制器 Current Mode 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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845AD8G4 | 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller 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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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