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參數(shù)資料
| 型號： | AIC3843CNTB |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Current-Mode PWM Controller |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 189K |
| 代理商： | AIC3843CNTB |
AIC3843
6
Oscillator Section
4
5
R
T
C
T
R
T
/C
T
V
REF
GND
For RT>5k, f
≈
8
T
T
C
*
R
72
.
Deadtime vs CT (RT>5K
)
Fig. 4-2
t
μ
s
CT (nF)
1
10
100
0.3
1
3
0
10
30
Timing Resistance vs. Frequency
Fig. 4-3
R
)
Frequency (Hz)
10
2
103
10
4
10
5
10
6
3
10
100
CT=100nF
47nF
22nF
10nF
4.7nF
2.2nF
1.0nF
30
Fig. 4-1
S
Output Current, Source or Sink - (A)
Fig. 4-4 Output saturation characteristics
0.01
0.1
1
0
1
2
3
5
6
7
SOURCE SAT
(Vcc-VoH)
SINK SAT (Vol)
Vcc=15
V
TA=+25
°
solid line
TA=-55
°
dash line
10
100
1k
10k
100k
1M
-20
0
20
40
60
80
P
V
Frequency (Hz)
-200
-150
-100
-50
0
Fig. 4-5 Error Amplifier Open-Loop Frequency Response
Open-Loop Laboratory Fixture
1
2
3
4
5
6
7
8
COMP
V FB
I
SENSE
R
T
/C
T
VREF
VCC
OUTPUT
GND
A
4.7K
1K
ERROR
AMP
ADJUST
4.7K
I
SENSE
ADJUST
100K
2N2222
R1
AIC3843
0.1
μ
F
0.1
μ
F
1k
1W
VREF
VCC
OUTPUT
GND
5K
C
T
High peak currents associated with capacitive loads necessitate careful grounding techniques.
Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The
transistor and 5k potentiometer are used to sample the oscillator waveform and apply an adjustable
ramp to pin 3.
Fig. 5
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