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AIC3842CS 参数 Datasheet PDF下载

AIC3842CS图片预览
型号: AIC3842CS
PDF下载: 下载PDF文件 查看货源
内容描述: 电流模式PWM控制器 [Current-Mode PWM Controller]
分类和应用: 控制器
文件页数/大小: 7 页 / 117 K
品牌: AIC [ ANALOG INTERGRATIONS CORPORATION ]
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PRELIMINARY
AIC3842
Current-Mode PWM Controller
n
FEATURES
l
Low Start-Up Current (300µA 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
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
lockout
(UVLO)
with
approximately 300µA start-up current, 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.
n
APPLICATIONS
l
Off-Line Converter.
l
DC/DC Converter.
n
TYPICAL APPLICATION CIRCUIT
2
C2
R3
51K
FEEDBACK
SIGNAL
300pF
C3
1000P
6
OUTPUT
GND
5
VFB
VCC
7
+
C1
47
µ
F
VCC
INDUCTOR
M1
R2
20K
R5
C6
300P
390
C7
1nF
RS
0.33
1
8
COMP
VREF
R1
10
R4
7.5K
C5
0.1
µ
F
4
RT/CT
ISENSE
3
AIC3842
C4
2.2nF
Current Mode PWM Control Circuit
n
ORDERING INFORMATION
AIC3842CX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUT
LINE
ORDER NUMBER
AIC3842CN
(PLASTIC DIP)
COMP
PIN CONFIGURATION
1
8
VREF
7
VCC
6
OUTPUT
5
GND
VFB 2
ISENSE 3
AIC3842CS
(PLASTIC SO)
RT/CT
4
Analog Integrations Corporation
DS-3842-P1 May 5, 00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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