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參數(shù)資料
| 型號(hào)： | UC3845 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Performance Current Mode Controllers(高性能電流模式控制器) |
| 中文描述： | 高性能電流模式控制器（高性能電流模式控制器） |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 354K |
| 代理商： | UC3845 |
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UC3844, UC3845, UC2844, UC2845
http://onsemi.com
6
I
C
,
Figure 14. Output Cross Conduction
Figure 15. Supply Current versus
Supply Voltage
100 ns/DIV
V
CC
= 30 V
C
L
= 15 pF
T
A
= 255C
1
2
25
20
15
10
5
0
0
10
20
30
40
V
CC
, SUPPLY VOLTAGE (V)
R
T
= 10 k
C
T
= 3.3 nF
V
FB
= 0 V
I
Sense
= 0 V
T
A
= 255C
U
U
V
C
,
I
C
,
PIN FUNCTION DESCRIPTION
Pin
Function
Description
8Pin
14Pin
1
1
Compensation
This pin is Error Amplifier output and is made available for loop compensation.
2
3
Voltage
Feedback
This is the inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
3
5
Current Sense
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
4
7
R
T
/C
T
The Oscillator frequency and maximum Output duty cycle are programmed by connecting
resistor R
T
to V
ref
and capacitor C
T
to ground. Operation to 1.0 MHz is possible.
5
GND
This pin is combined control circuitry and power ground (8pin package only).
6
10
Output
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are
sourced and sunk by this pin. The output switches at onehalf the oscillator frequency.
7
12
V
CC
This pin is the positive supply of the control IC.
8
14
V
ref
This is the reference output. It provides charging current for capacitor C
T
through resistor R
T
.
8
Power Ground
This pin is a separate power ground return (14pin package only) that is connected back to
the power source. It is used to reduce the effects of switching transient noise on the control
circuitry.
11
V
C
The Output high state (V
OH
) is set by the voltage applied to this pin (14pin package only).
With a separate power source connection, it can reduce the effects of switching transient
noise on the control circuitry.
9
GND
This pin is the control circuitry ground return (14pin package only) and is connected to back
to the power source ground.
2,4,6,13
NC
No connection (14pin package only). These pins are not internally connected.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845A | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Current Mode PWM Controller |
| UC3845A-BW | 制造商:FCI 制造商全稱(chēng):First Components International 功能描述:Current Mode PWM Controller Low Start-Up and Operating Current |
| UC3845AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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 |
| UC3845AD1 | 功能描述:電流型 PWM 控制器 RO 511-UC3845BD 9/04 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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 |
| UC3845AD1013TR | 制造商:STMicroelectronics 功能描述: |
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