Current-Mode PWM Controller
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.
By Texas Instruments
|UC2844D||Texas Instruments||Current-Mode PWM Controller 14-SOIC -40 to 85|
|UC2844N||Texas Instruments||Current-Mode PWM Controller 8-PDIP -40 to 85|
|UC2844AN||Texas Instruments||Current Mode PWM Controller 8-PDIP -40 to 85|
|UC2844AD||Texas Instruments||Current Mode PWM Controller 14-SOIC -40 to 85|
|UC2844D8||Texas Instruments||Current-Mode PWM Controller 8-SOIC -40 to 85|
|UC2844AQD||Texas Instruments||IC 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, MS-012AB, SOIC-14, Switching Regulator or Controller|
|UC2844AQDR||Texas Instruments||Current Mode PWM Controller 14-SOIC -40 to 125|
|UC2844ANG4||Texas Instruments||Current Mode PWM Controller 8-PDIP -40 to 85|
|UC2844AQD8||Texas Instruments||Current Mode PWM Controller 8-SOIC -40 to 125|
|UC2844AD8||Texas Instruments||Current Mode PWM Controller 8-SOIC -40 to 85|
|UC2844 Pb-Free||UC2844 Cross Reference||UC2844 Schematic||UC2844 Distributor|
|UC2844 Application Notes||UC2844 RoHS||UC2844 Circuits||UC2844 footprint|