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參數(shù)資料
| 型號： | UC2845B |
| 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） |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 400K |
| 代理商： | UC2845B |
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
6
(Load to V
)
T
C
T
= 3.3 nF
FB
I
= 0 V
T
A
= 25
C
,
C
I
00
V
CC
, SUPPLY VOLTAGE (V)
10
20
30
40
5
10
15
20
25
U
U
Figure 12. Output Saturation Voltage
versus Load Current
Figure 13. Output Waveform
T
A
= 25
C
V
CC
120 Hz Rate
V
CC
= 15 V
A
GND
A
0
V
800
0
I
O
, OUTPUT LOAD CURRENT (mA)
200
400
600
1.0
2.0
3.0
2.0
1.0
0
Source Saturation
50 ns/DIV
90
%
10
%
V
CC
= 15 V
C
L
= 1.0 nF
T
A
= 25
°
C
100 ns/DIV
V
CC
= 30 V
C
L
= 15 pF
T
A
= 25
°
C
,
C
1
2
I
,
O
V
Figure 14. Output Cross Conduction
Figure 15. Supply Current versus Supply Voltage
PIN FUNCTION DESCRIPTION
Pin
Function
Description
8Pin
14Pin
1
1
Compensation
This pin is the 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. Oscillator operation to 1.0 kHz is possible.
5
GND
This pin is the combined control circuitry and power ground.
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
V
ref
Power
Ground
This pin is the positive supply of the control IC.
8
14
This is the reference output. It provides charging current for capacitor C
T
through resistor R
T
.
This pin is a separate power ground return that is connected back to the power source. It is used
to reduce the effects of switching transient noise on the control circuitry.
8
11
V
C
The Output high state (V
) is set by the voltage applied to this pin. 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 and is connected back to the powersource ground.
2,4,6,13
NC
No connection. These pins are not internally connected.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UC2845BAC | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC2845BD | 功能描述:電流型 PWM 控制器 52kHz 1A Current 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(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845BD1 | 功能描述:電流型 PWM 控制器 0.5mA Current Mode 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(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845BD1013TR | 功能描述:電流型 PWM 控制器 0.5mA Current Mode 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(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845BD1G | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max 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(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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