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UC3844 参数 Datasheet PDF下载

UC3844图片预览
型号: UC3844
PDF下载: 下载PDF文件 查看货源
内容描述: 高性能电流模式控制器 [HIGH PERFORMANCE CURRENT MODE CONTROLLERS]
分类和应用: 控制器
文件页数/大小: 14 页 / 380 K
品牌: MOTOROLA [ MOTOROLA ]
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UC3844, 45 UC2844, 45  
Figure 14. Supply Current versus  
Supply Voltage  
Figure 13. Output Cross Conduction  
25  
20  
15  
10  
5
V
= 30 V  
= 15 pF  
= 25°C  
CC  
L
C
T
A
R
C
= 10 k  
= 3.3 nF  
= 0 V  
= 0 V  
T
T
V
I
T
FB  
Sense  
= 25°C  
A
0
0
10  
20  
30  
40  
100 ns/DIV  
V
, SUPPLY VOLTAGE (V)  
CC  
PIN FUNCTION DESCRIPTION  
Pin  
8–Pin  
14–Pin  
Function  
Description  
This pin is Error Amplifier output and is made available for loop compensation.  
1
2
1
3
Compensation  
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
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  
T
The Oscillator frequency and maximum Output duty cycle are programmed by connecting  
T
resistor R to V and capacitor C to ground. Operation to 1.0 MHz is possible.  
T
ref  
T
5
6
Gnd  
This pin is combined control circuitry and power ground (8–pin package only).  
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
ref  
This is the reference output. It provides charging current for capacitor C through resistor R .  
T T  
Power Ground  
This pin is a separate power ground return (14–pin 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  
a separate power source connection, it can reduce the effects of switching transient noise on the  
control circuitry.  
) is set by the voltage applied to this pin (14–pin package only). With  
OH  
9
Gnd  
NC  
This pin is the control circuitry ground return (14–pin package only) and is connected to back to  
the power source ground.  
2,4,6,13  
No connection (14–pin package only). These pins are not internally connected.  
6
MOTOROLA ANALOG IC DEVICE DATA  
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