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UC2845BAC PDF预览

UC2845BAC

更新时间： 2024-02-14 05:18:24
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
20页 320K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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UC2845BAC 技术参数

生命周期：Obsolete包装说明：DFP, FL14,.25
Reach Compliance Code：unknown风险等级：5.84
控制模式：CURRENT-MODEJESD-30 代码：R-XDFP-F14
端子数量：14最高工作温度：85 °C
最低工作温度：-40 °C最大输出电流：0.2 A
封装主体材料：CERAMIC封装代码：DFP
封装等效代码：FL14,.25封装形状：RECTANGULAR
封装形式：FLATPACK认证状态：Not Qualified
子类别：Switching Regulator or Controllers表面贴装：YES
最大切换频率：500 kHz技术：BIPOLAR
温度等级：INDUSTRIAL端子形式：FLAT
端子节距：1.27 mm端子位置：DUAL
Base Number Matches：1

UC2845BAC 数据手册

 浏览型号UC2845BAC的Datasheet PDF文件第4页浏览型号UC2845BAC的Datasheet PDF文件第5页浏览型号UC2845BAC的Datasheet PDF文件第6页浏览型号UC2845BAC的Datasheet PDF文件第8页浏览型号UC2845BAC的Datasheet PDF文件第9页浏览型号UC2845BAC的Datasheet PDF文件第10页 
UC3844B, UC3845B, UC2844B, UC2845B  
0
−1.0  
−ꢁ2.0  
Source Saturation  
(Load to Ground)  
V
= 15 V  
80 ms Pulsed Load  
CC  
V
CC  
V
= 15 V  
C = 1.0 nF  
CC  
T = 25°C  
A
L
90  
%
120 Hz Rate  
T = 25°C  
A
T = −ꢁ55°C  
A
3.0  
2.0  
1.0  
0
T = −ꢁ55°C  
A
T = 25°C  
A
10  
%
Sink Saturation  
)
GND  
600  
(Load to V  
CC  
0
200  
400  
800  
50 ns/DIV  
Iꢁ , OUTPUT LOAD CURRENT (mA)  
O
Figure 12. Output Saturation Voltage  
versus Load Current  
Figure 13. Output Waveform  
25  
V
= 30 V  
C = 15 pF  
CC  
L
20  
15  
10  
5
T = 25°C  
A
R = 10 k  
T
C = 3.3 nF  
T
V
FB  
= 0 V  
I
= 0 V  
Sense  
T = 25°C  
A
0
0
10  
20  
, SUPPLY VOLTAGE (V)  
30  
40  
100 ns/DIV  
V
CC  
Figure 14. Output Cross Conduction  
Figure 15. Supply Current versus Supply Voltage  
PIN FUNCTION DESCRIPTION  
Pin  
8−Pin  
14−Pin  
Function  
Description  
1
2
1
3
Compensation This pin is the Error Amplifier output and is made available for loop compensation.  
Voltage  
This is the inverting input of the Error Amplifier. It is normally connected to the switching power  
supply output through a resistor divider.  
Feedback  
3
4
5
7
Current Sense A voltage proportional to inductor current is connected to this input. The PWM uses this  
information to terminate the output switch conduction.  
R /C  
The Oscillator frequency and maximum Output duty cycle are programmed by connecting resistor  
R to V and capacitor C to ground. Oscillator operation to 1.0 kHz is possible.  
T
T
T
ref  
T
5
6
GND  
This pin is the combined control circuitry and power ground.  
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 one−half the oscillator frequency.  
7
8
12  
14  
8
V
This pin is the positive supply of the control IC.  
CC  
V
This is the reference output. It provides charging current for capacitor C through resistor R .  
T T  
ref  
Power  
Ground  
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.  
11  
V
The Output high state (V ) is set by the voltage applied to this pin. With a separate power source  
C
OH  
connection, it can reduce the effects of switching transient noise on the control circuitry.  
This pin is the control circuitry ground return and is connected back to the powersource ground.  
No connection. These pins are not internally connected.  
9
GND  
NC  
2,4,6,13  
http://onsemi.com  
7
1...45678910...20

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