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參數資料
| 型號： | AIC3843CSTR |
| 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： | 1/11頁 |
| 文件大小： | 189K |
| 代理商： | AIC3843CSTR |
AIC3843
Current-Mode PWM Controller
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan
DS-3843-00 012102
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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
Under
-
voltage Lockout with Hysteresis.
l
Double Pulse Suppression.
l
High Current Totem Pole Output.
n
APPLICATIONS
l
AC/DC Off-line Converter.
l
DC/DC Off-line Converter.
n
DESCRIPTION
The AIC3843 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 under-voltage lockout (UVLO) with approxi-
mately 300
μ
A 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 the N-
channel MOSFETs, is low in the off state.
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
AIC3843
INDUCTOR
FEEDBACK
SIGNAL
VCC
7
6
5
3
4
8
1
2
VCC
OUTPUT
RT/CT
GND
ISENSE
VFB
Current Mode PWM Control Circuit
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