PROGRAMMABLE OFF-LINE PWM CONTROLLER IC
Vcc 32V | -25°C to +85°C | DIP-18 package
- Manufacturer: STMicroelectronics
- Package: DIP18
- Product Family: PWM CONTROLLER
- 500 kHz OPERATION
- The UC2840 is identical to UC3840 ,but has an extended temperature range (-25°C to +85°C)
Although containing most of the features required by all types of switching power supply controllers. The UC1840 family has been optimized for highly-efficient boot-strapped prirnaryside operation in foreward or flyback power converters. Two important features for this mode are a starting circuit which requires little current from the primary input voltage and feed-forward control lor constant volt-second operation over a wide input voltage range.
In addition to startup and normal regulating PWM functions,these devices ofter built-inprotection from over-voltage, under-voltage, and over-current fault conditions. This monitoring circuitry contains the added features that any fault will initiate a complete shutdown with provisions for either latch off or automatic restart. In the latch off mode, the controller may be started and stopped with external pulsed or steady-state commands.
Other performance features ot these devices include a 1% accurate reference, provision for slow-turn-on and duty-cycle limiting, and highspeed pulse-by-pulse current limiting in addition to current fault shutdown.
The UC2840‘s PWM output stage includes a latch to insure only a single pulse per period and is designed to optimize the turn off of an external switching device by conducting during the "OFF" time with a capability for both high peak current and low saturation voltage. These devices are available in an 18-pin dual-in-line plastic or ceramic package.
The UC2840 and UC3840 are designed for operation from -25'C to +85 C and 0 C to +70 C. respectively.
In addition to startup and normal regulating PWM functions,these devices ofter built-inprotection from over-voltage, under-voltage, and over-current fault conditions. This monitoring circuitry contains the added features that any fault will initiate a complete shutdown with provisions for either latch off or automatic restart. In the latch off mode, the controller may be started and stopped with external pulsed or steady-state commands.
Other performance features ot these devices include a 1% accurate reference, provision for slow-turn-on and duty-cycle limiting, and highspeed pulse-by-pulse current limiting in addition to current fault shutdown.
The UC2840‘s PWM output stage includes a latch to insure only a single pulse per period and is designed to optimize the turn off of an external switching device by conducting during the "OFF" time with a capability for both high peak current and low saturation voltage. These devices are available in an 18-pin dual-in-line plastic or ceramic package.
The UC2840 and UC3840 are designed for operation from -25'C to +85 C and 0 C to +70 C. respectively.
- ALL CONTROL, DRIVING, MONITORING AND PROTECTION FUNCTIONS INCLUDED
- LOW-CURRENT, OFF-LINE START CIRCUIT
- FEED-FORWARD LINE REGULATION OVER 4 TO 1 INPUT RANGE
- PWM LATCH FOR SINGLE PULSE PER PERIOD
- PULSE-BY-PULSE CURRENT LIMITING PLUS SHUTDOWN FOR OVER-CURRENT FAULT
- NO START-UP OR SHUTDOWN TRANSIENTS
- SLOW TURN-ON AND MAXIMUM DUTY-CYCLE CLAMP
- SHUTDOWN UPON OVER-OR UNDERVOLTAGE SENSING
- LATCH OFF OR CONTINUOUS RETRY AFTER FAULT
- REMOTE, PULSE-COMMANDABLE START/STOP
- PWM OUTPUT SWITCH USABLE TO 1A PEAK CURRENT
- 1% REFERENCE ACCURACY
- 500 kHz OPERATION
NEW OLD STOCK (NOS)
NOT PULLED - NOT USED - NOT REFURBISHED - NOT SOLDERED - NOT RE-MARKED - NOT FAKED EXCLUSIVELY
NOT PULLED - NOT USED - NOT REFURBISHED - NOT SOLDERED - NOT RE-MARKED - NOT FAKED EXCLUSIVELY
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entnommen aus der original Verpackung (siehe Foto)
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