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參數(shù)資料
| 型號： | AIC3842CS |
| 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)： | 1/7頁 |
| 文件大?。?/td> | 114K |
| 代理商： | AIC3842CS |
PRELIMINARY
AIC3842
Current-Mode PWM Controller
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-3842-P1 May 5, 00
TEL: 886-3-5772500
FAX: 886-3-5772510
1
n
FEATURES
l
Low Start-Up Current (300
μ
A Typical)
l
Internal Precision Reference.
l
500KHz Current-Mode Operation.
l
Pulse-by-Pulse Current Limiting.
l
Automatic Feed-Forward Compensation.
l
Optimized for Off-Line and DC/DC Converters.
l
Undervoltage Lockout with Hysteresis.
l
Double Pulse Suppression.
l
High Current Totem-Pole Output.
n
APPLICATIONS
l
Off-Line Converter.
l
DC/DC Converter.
n
DESCRIPTION
The AIC3842 control IC provides the features
that are necessary to implement off-line or
DC/DC Converter fixed-frequency current-mode
schemes with a minimum number of external
components. This integrated circuits features
an
undervoltage
approximately
300
μ
A
precision reference trimmed for accuracy at the
error amplifier input, high gain error amplifier,
current sensing comparator, logic to insure
latched operation, and a totem-pole output
stage designed to source or sink high peak
current. The output stage, suitable for driving N
channel MOSFETs, is low in the off state.
lockout
start-up
(UVLO)
current,
with
a
n
TYPICAL APPLICATION CIRCUIT
M1
C3
1000P
C2
300pF
C6
300P
RS
0.33
R2
20K
R4
7.5K
R1
10
R5
390
R3
51K
C5
0.1
μ
F
C4
2.2nF
C7
1nF
+
C1
47
μ
F
COMP
VREF
AIC3842
INDUCTOR
FEEDBACK
SIGNAL
VCC
7
6
5
3
4
8
1
2
VCC
OUTPUT
RT/CT
GND
ISENSE
VFB
Current Mode PWM Control Circuit
n
ORDERING INFORMATION
AIC3842CX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUT
LINE
ORDER NUMBER
AIC3842CN
(PLASTIC DIP)
PIN CONFIGURATION
1
3
2
4
COMP
VFB
ISENSE
RT/CT
GND
VREF
VCC
OUTPUT
5
8
7
6
AIC3842CS
(PLASTIC SO)
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