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AIC3842 Datasheet

Part Number AIC3842
Manufacturers Analog Intergrations Corporation
Logo Analog Intergrations Corporation
Description Current-Mode PWM Controller
Datasheet AIC3842 DatasheetAIC3842 Datasheet (PDF)

PRELIMINARY AIC3842 Current-Mode PWM Controller n FEATURES l Low Start-Up Current (300 µA 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 C.

  AIC3842   AIC3842






Part Number AIC3843
Manufacturers Analog Integrations
Logo Analog Integrations
Description Current-Mode PWM Controller
Datasheet AIC3842 DatasheetAIC3843 Datasheet (PDF)

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. DESCRIPTION The AIC3843 control IC provides the features that are necessary to implement off-line or DC/DC Converter fixed-frequency current-mod.

  AIC3842   AIC3842







Current-Mode PWM Controller

PRELIMINARY AIC3842 Current-Mode PWM Controller n FEATURES l Low Start-Up Current (300 µA 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 300 µA 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 47µF VCC INDUCTOR M1 R2 20K R5 C6 300P 390 C7 1nF RS 0.33 1 8 COMP VREF R1 10 R4 7.5K C5 0.1µF 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 .


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