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參數(shù)資料
| 型號(hào)： | AIC3843 |
| 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(yè)數(shù)： | 7/11頁(yè) |
| 文件大?。?/td> | 189K |
| 代理商： | AIC3843 |
AIC3843
7
Open-Loop Laboratory Fixture
8
3
1
V
REF
I
SENSE
1k
330O
500
SHUTDOWN
TO CURRENT SENSE
RESISTOR
Fig. 6-1
SHUTDOWN
COMP
Fig. 6-2
Shutdown of the AIC3843 can be accomplished by two methods; either raise pin 3 above 1V or pull pin 1 below a voltage two-diode
drops above ground. Either method causes the output of the PWM comparator to be high (refer to block diagram). The PWM latch
is reset dominant so that the output will remain low until the next clock cycle after the shutdown condition at pin 1 and/or 3 is
removed. In one example, an externally latched shutdown may be accomplished by adding an SCR, which will be reset by cycling
Vcc below the lower UVLO threshold. At this point the reference turns off, allowing the SCR to reset.
Offline Flyback Regulator
1
2
3
45
6
7
8
VARO
VM68
117 VAC
C1
250
μ
F
250V
R2
56K
2W
R
12
2W
4.7K
C9
3300pF
600V
D4
1N3613
Np
T1
N5
N12
N12
Nc
D6
USD945
C10
4700
μ
F
10V
C11
4700
μ
F
10V
+
5V
COM
+12V
±12V COM
-12V
C12
2200
μ
F
16V
C13
2200
μ
F
16V
D7
UFS1002
D8
UES1002
R11
2.7k
2W
C8
680pF
16V
D5
1N3613
Q1
UFN833
R7
22
R13
10K
C7
470pF
R8
1k
USD1120
R10
0.55
1W
D4
1N3613
D2
1N3612
C3
22
μ
F
C2
100
μ
F
25V
C4
25V
47
μ
F
R9
68
3W
R3
20k
R4
4.7k
R5 150k
C14 100pF
R6
10k
C6
0.0022
μ
F
C5
0.01
μ
F
AIC3843
1. Input Voltage
95VAC to 130VA
(50Hz/60Hz)
3750V
40kHz
2. Line Isolation
3. Switching Frequency
4. Efficiency @ Full Load 70%
5. Output Voltage:
A. +5V, ±5%; 1A to 4A load
Ripple voltage: 50mV P-P Max
B. +12V, ±3%; 0.1A to 0.3A load
Ripple voltage: 100mV P-P Max
C.-12V, ±3%; 0.1A to 0.3A load
Ripple voltage: 100mV P-P Max
Power Supply Specifications
L1
10
μ
H
R1
5
1W
Fig. 7
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