3 Stück /3 pieces UC2844N
CURRENT MODE PWM CONTROLLER IC Vcc 30V in DIP8
CURRENT MODE PWM CONTROLLER IC Vcc 30V in DIP8
Vcc 30V in DIP8
- Manufacturer: STMicroelectronics
- Package: DIP8
- Product Family: PWM CONTROLLER IC
- The UC2844 is identical to UC3844 ,but has an extended temperature range (-25°C to +85°C)
The UC3842/3/4/5 family of control ICs providesthe necessary features to implement off-line or DC to DC fixed frequency current mode control schemes witha minimal external parts count. Internally implemented circuits include undervoltage 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 UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843 and UC3845 are 8.5 V and 7.9 V. The UC3842 and UC3843 can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844 and UC3845by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843 and UC3845 are 8.5 V and 7.9 V. The UC3842 and UC3843 can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844 and UC3845by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
- 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 ERRORAMP
NOT PULLED - NOT USED - NOT REFURBISHED - NOT SOLDERED
- NOT RE-MARKED - NOT FAKED EXCLUSIVELY NEW OLD STOCK (NOS)
AUSSCHLIESSLICH NUR ALTE NEUE WARE (NOS) aus Altlagerbestand
- entnommen aus der original Verpackung (siehe Foto).
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