UCC3580D-1 ,1UCC1580-1,-2,-3,-4UCC2580-1,-2,-3,-4UCC3580-1,-2,-3,-4Single Ended Active Clamp/Reset PWM
UCC3580D-2 ,1FEATURES DESCRIPTIONProvides Auxiliary Switch Activation The UCC3580 family of PWM controllers is d ..
UCC3580D-2 ,1ELECTRICAL CHARACTERISTICSUnless otherwise stated, all specifications are over the full temperature ..
UCC3580D-2 ,1BLOCK DIAGRAMUDG-95069-2Pin Numbers refer to DIL-16 and SOIC-16 packagesSLUS292D - FEBRUARY 1999 - ..
UCC3580D-3 ,1FEATURES DESCRIPTIONProvides Auxiliary Switch Activation The UCC3580 family of PWM controllers is d ..
UCC3580D-3 ,1ELECTRICAL CHARACTERISTICSUnless otherwise stated, all specifications are over the full temperature ..
UPA-2450 ,Nch enhancement-type MOSFETFEATURES5.0±0.1• 2.5 V drive avaliable• Low on-state resistanceRDS(on)1 = 17.5 mΩ MAX. (VGS = 4.5 V ..
UPA2450BTL-E1 ,Nch enhancement-type MOSFETFEATURES 5.0±0.1• 2.5 V drive available • Low on-state resistance RDS(on)1 = 17.5 mΩ MAX. (VGS = 4 ..
UPA2450TL , N-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHING
UPA2450-TL-E1 ,Nch enhancement-type MOSFETELECTRICAL CHARACTERISTICS (TA = 25°C)CHARACTERISTICS SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNITZer ..
UPA2450TL-E1 ,Nch enhancement-type MOSFETDATA SHEETMOS FIELD EFFECT TRANSISTORµµµµ PA2450N-CHANNEL MOS FIELD EFFECT TRANSISTORFOR SWITCHI ..
UPA2451 ,Nch enhancement-type MOSFETFEATURES5.0±0.1• 2.5 V drive available• Low on-state resistanceRDS(on)1 = 20 mΩ MAX. (VGS = 4.5 V, ..
UCC3580D-1
Single-Ended Active Clamp/Reset PWM
UCC1580-1,-2,-3,-4
UCC2580-1,-2,-3,-4
UCC3580-1,-2,-3,-4
FEATURESProvides Auxiliary Switch Activation
Complementaryto Main Power
Switch Drive
Programmable deadtime (Turn-on
Delay) Between Activationof Each
Switch
Voltage Mode Control with
Feedforward Operation
Programmable Limits for Both
Transformer Volt- Second Product
and PWM Duty Cycle
High Current Gate Driver for Both
Main and Auxiliary Outputs
Multiple Protection Features with
Latched Shutdown and Soft Restart
Low Supply Current (100 �A Startup,
1.5 mA Operation)
BLOCK DIAGRAM
DESCRIPTIONThe UCC3580 familyof PWM controllersis designedto implementa variety active clamp/reset and synchronous rectifier switching converter topolo-
gies. While containingall the necessary functions for fixed frequency, high
performance pulse width modulation, the additional featureof this designis
the inclusionof an auxiliary switch driver which complements the main
power switch, and witha programmable deadtimeor delay between each
transition. The active clamp/reset technique allows operationof single
ended converters beyond 50% duty cycle while reducing voltage stresses the switches, and allowsa greater flux swing for the power transformer.
This approach also allowsa reductionin switching lossesby recovering en-
ergy storedin parasitic elements such as leakage inductance and switch
capacitance.
The oscillatoris programmed with two resistors anda capacitorto set
switching frequency and maximum duty cycle. A separate synchronized
ramp providesa voltage feedforward pulse width modulation anda pro-
grammed maximum volt-second limit. The generated clock from the oscilla-
tor contains both frequency and maximum duty cycle information.
(continued)Single Ended Active Clamp/Reset PWM
