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Part Number : UC1842
Function : CURRENT MODE PWM CONTROLLER
Maker : Texas Instruments

Pinouts :
UC1842 datasheet

Description :

DESCRIPTION
The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error
amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, 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. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO
thresholds of 16 VON and 10 VOFF , ideally suited to off-line applications. The corresponding thresholds for the UC1843 and UC1845 are 8.4 V and 7.6 V.
The UC1842 and UC1843 can operate to duty cycles approaching 100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

FEATURES
• Optimized For Off-line and DC-to-DC Converters
• Low Start-Up Current (<1 mA)
• Automatic Feed Forward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load Response Characteristics
• Under-Voltage Lockout With Hysteresis
• Double Pulse Suppression
• High Current Totem Pole Output
• Internally Trimmed Bandgap Reference
• 500-kHz Operation
• Low RO Error Amp


Datasheet PDF Download :
UC1842 pdf

Others datasheet of same file : UC1842,UC1842AJ,UC1842AJ883B,UC1842AJQMLV,UC1842AL883B
2015/01/28 13:52 2015/01/28 13:52

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