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Analog Integrations

AIC3843 Datasheet Preview

AIC3843 Datasheet

Current-Mode PWM Controller

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AIC3843
Current-Mode PWM Controller
FEATURES
Low Start-Up Current (300µA Typical)
Internal Precision Reference.
500KHz Current-Mode Operation.
Pulse-by-Pulse Current Limiting.
Automatic Feed-Forward Compensation.
Optimized for Off-line and DC/DC Converters.
Under-voltage Lockout with Hysteresis.
Double Pulse Suppression.
High Current Totem Pole Output.
APPLICATIONS
AC/DC Off-line Converter.
DC/DC Off-line Converter.
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 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 the N-
channel MOSFETs, is low in the off state.
TYPICAL APPLICATION CIRCUIT
2 VFB
7
VCC
C2 +
R3 300pF C3
51K 1000P
FEEDBACK
SIGNAL
C5
0.1µF
R4
7.5K
C4
2.2nF
1 COMP
8 VREF
6
OUTPUT
GND 5
R1
10
4 RT/CT
ISENSE 3
AIC3843
C6
300P
C1
47µF
VCC
INDUCTOR
M1
R2
20K
R5
390
C7
1nF
RS
0.33
Current Mode PWM Control Circuit
www.DataSheet4U.com
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-3843G-01 120508
1




Analog Integrations

AIC3843 Datasheet Preview

AIC3843 Datasheet

Current-Mode PWM Controller

No Preview Available !

AIC3843
ORDERING INFORMATION
AIC3843XXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGING TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
PIN CONFIGURATION
DIP-8 (CN&PN)
SO-8 (CS&PS)
TOP VIEW
COMP 1
VFB 2
ISENSE 3
RT/CT 4
8 VREF
7 VCC
6 OUTPUT
5 GND
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
G: GREEN PACKAGE
Example: AIC3843CSTR
in SO-8 Package & Taping & Reel Packing Type
(CN is not available in Tape & Reel packing type.)
AIC3843PSTR
in SO-8 Lead Free Package & Taping & Reel
Packing Type
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (Low Impedance Source )
Supply Voltage (ICC<30mA)
Output Current
Output Energy (Capacitive Load)
Analog Inputs (Pins 2, 3)
Error Amp Output Sink Current
Power Dissipation at TA25°C DIP Package
SOIC Package
Operating Temperature Range
Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 Sec)
30V
Self Limiting
±1A
5µJ
-0.3V ~ +6.3V
10mA
1W
725mW
-40°C ~ 85°C
125°C
-65°C ~ 150°C
260°C
Note 1: All voltages are with respect to Pin 5.
All currents are positive into the specified terminal.
Note 2: Absolute Maximum Ratings are those values beyond which the life of a device may be
Impaired.
www.DataSheet4U.com
2


Part Number AIC3843
Description Current-Mode PWM Controller
Maker Analog Integrations
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AIC3843 Datasheet PDF





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