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UCC28502NG4

UCC28502NG4
Mfr. #:
UCC28502NG4
Descrizione:
IC PFC CTRLR AVERAGE CURR 20DIP
Ciclo vitale:
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UCC28502NG4 maggiori informazioni UCC28502NG4 Product Details
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Valore attributo
Tags
UCC28502, UCC2850, UCC285, UCC28, UCC2, UCC
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Step1: Vacuum Packaging with PL
Step1:
Vacuum Packaging with PL
Step2: Anti-Static Bag
Step2:
Anti-Static Bag
Step3: Packaging Boxes
Step3:
Packaging Boxes
***ponent Stockers USA
1.2 A POWER FACTOR CONTROLLER WITH POST REGULATOR 120 kHz SWITCHING FREQ-MAX PDIP20
***ser
Power Factor Correction (PFC) ICs BiCMOS PFC/PWM Comb Controller
***i-Key
IC PFC CTRLR AVERAGE CURR 20DIP
***eco
BICMOS PFC/PWM COMBINATION CONTROLLER
***as Instruments
The UCC2850x family provides all of the control functions necessary for an active power-factor-corrected preregulator and a second-stage dc-to-dc converter. The controller achieves near-unity power factor by shaping the ac input line current waveform to correspond to the ac input-line voltage using average current-mode control. The dc-to-dc converter uses peak current-mode control to perform the step-down power conversion. The PFC stage is leading-edge modulated while the second stage is trailing-edge synchronized to allow for minimum overlap between the boost and PWM switches. This reduces ripple current in the bulk-output capacitor.In order to operate with over three-to-one range of input-line voltages, a line feedforward (VFF) is used to keep input power constant with varying input voltage. Generation of VFF is accomplished using IAC in conjunction with an external single-pole filter. This not only reduces external parts count, but also avoids the use of high-voltage components, offering a lower-cost solution. The multiplier then divides the line current by the square of VFF. The UCC2850x PFC section incorporates a low offset-voltage amplifier with 7.5-V reference, a highly-linear multiplier capable of a wide current range, a high-bandwidth, low offset-current amplifier, with a novel noise-attenuation configuration, PWM comparator and latch, and a high-current output driver. Additional PFC features include over-voltage protection, zero-power detection to turn off the output when VAOUT is below 0.33 V and peak current and power limiting. The dc-to-dc section relies on an error signal generated on the secondary-side and processes it by performing peak current mode control. The dc-to-dc section also features current limiting, a controlled soft-start, preset operating range with selectable options, and 50% maximum duty cycle. The UCC28500 and UCC28502 have a wide PFC-UVLO threshold (16.5 V/10 V) for bootstrap bias supply operation. The UCC28501 and UCC28503 are designed with a narrow UVLO range (10.5 V/10 V) more suitable for fixed bias operation. The UCC28500 and UCC28501 have a narrow UVLO threshold for PWM stage (to allow operation down to 75% of nominal bulk voltage), while the UCC28502 and UCC38503 are configured for a much wider operation range for the PWM stage (down to 50% of bulk nominal voltage). Available in 20-pin N and DW packages.
Parte # Descrizione Azione Prezzo
UCC28502NG4
DISTI # UCC28502NG4-ND		IC PFC CTRLR AVERAGE CURR 20DIP
RoHS: Compliant
Min Qty: 100
Container: Tube		Limited Supply - Call
    Immagine Parte # Descrizione
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    Disponibilità
    Azione:
    Available
    Su ordine:
    3500
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