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參數(shù)資料
| 型號(hào)： | LM3842A |
| 廠商： | TAEJIN Technology Co., Ltd. |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大?。?/td> | 121K |
| 代理商： | LM3842A |
CURRENT MODE PWM CONTROLLER
Fig.1 Output Dead Time
Fig.2 Timing Resistor vs Frequency
Fig.3 Output Saturation Characteristics
Fig.4 Error Amplifier Open Loop
Gain and Phase Frequency
PIN FUNCTION DESCRIPTION
Pin No. Function
1
Compensation
Description
This pin is the Error Amplifier output and is made available for loop
compensation.
This is the inverting input of the Error Amplitier. It is normally connected
to the switching power supply output through a resister divider.
A voltage proportional to inductor current is connected to this input.
The PWM uses this information to terminate the output switch conduction.
The Oscillator frequency and maximum Output duty cycle are
programmed by connecting resistor R
T
to VR
EF
and capacitor C
T
to ground. Operation to 500kHz is possible.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents
up to 1.0A are sourced and sunk by this pin.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor
C
T
through resistor R
T
.
2
Voltage
Feedback
Current Sense
3
4
R
T
/C
T
5
6
GND
Output
7
8
Vcc
V
REF
HTC
6
LM3842A/3A/4A/5A
10
-3
2
4
6 810
-1
2
4
8
6
4
2
0
1
3
SINK (V
OL
)
V
CC
=15V
T
A
=25℃
SOURCE (V
CC
-V
OH
)
V
S
,
Io, Output Load Current (A)
80
50
20
s
R
T
,
8.0
5.0
1.0M
2.0
0.8
10k
20k
50k100k
500k
200k
Ω
fosc, Frequency (kHz)
C
T
=10nF
C
T
=5.0nF
C
T
=2.0nF
C
T
=1.0nF
C
T
=500pF
C
T
=200pF
C
T
=100pF
100
30
)
R
T
(
10
3
1M
100k
10k
1k
100
fosc, Frequency(Hz)
C
T
=100nF
C
T
=47nF
C
T
=22nF
C
T
=10nF
C
T
=4.7nF
C
T
=2.2nF
C
T
=10nF
80
60
40
10K 100K
1M
1K
100
0
-135
10
-180
0
-45
20
Fosc, Frequency (Hz)
-90
10M
A
V
,
Φ
Gain
Phase
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| LM3842A_08 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
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| LM3843A | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
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