Frequency Foldback Current Mode PWM Controller

The UCC3884 is a high performance current mode PWM Controller intended for single ended Switch mode power supplies. The chip implements a frequency foldback scheme that decreases the Oscillator frequency as the output voltage falls below a programmed value. This technique decreases the average output current sourced into a low impedance load which CAN occur during an output short circuit or overload condition. Excessive short circuit current is more prevalent in high frequency converters where the propagation delay and Switch turn-off time forces a minimum attainable duty cycle. An accurate volt-second clamp limits the duty cycle during line or load transient conditions which could otherwise saturate the transformer. The volt-second clamp may also be used with an external overvoltage protection circuit to handle fault conditions such as Current Sense disconnect or current transformer saturation.
The frequency foldback, volt-second clamp, cycle-by-cycle current limit, and overcurrent shutdown provide a rich set of protection features for use in peak current-mode pulse width Modulators
By Texas Instruments
Part Manufacturer Description Datasheet Samples
UCC3884NG4 Texas Instruments Frequency Foldback Current Mode PWM Controller 16-PDIP 0 to 70
UCC3884N Texas Instruments Frequency Foldback Current Mode PWM Controller 16-PDIP 0 to 70
UCC3884D Texas Instruments Frequency Foldback Current Mode PWM Controller 16-SOIC 0 to 70
UCC3884 's PackagesUCC3884 's pdf datasheet
UCC3884D SOIC
UCC3884DG4 SOIC
UCC3884DTRG4 SOIC
UCC3884N PDIP
UCC3884NG4 PDIP




UCC3884 Pinout, Pinouts
UCC3884 pinout,Pin out
This is one package pinout of UCC3884,If you need more pinouts please download UCC3884's pdf datasheet.

UCC3884 Application circuits
UCC3884 circuits
This is one application circuit of UCC3884,If you need more circuits,please download UCC3884's pdf datasheet.


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UCC3884 Application Notes UCC3884 RoHS UCC3884 Circuits UCC3884 footprint