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UCC28501

ACTIVO

Controlador combinado PFC/PWM con UVLO VCC de 10.5 V/10 V y UVLO PWM de 6.75 V/5.5 V y -40 °C a 85 °

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Misma funcionalidad con diferente configuración de pines que el dispositivo comparado
UCC28512 ACTIVO Controladores combinados PFC/PWM con UVLO VCC de 16V/9.7 V, UVLO PWM de 6.75 V/3.55 V y relación de More integrated for lower BOM count

Detalles del producto

Vin (max) (V) 18 Operating temperature range (°C) -55 to 125 Control mode CCM Topology Boost, PFC controller Rating Catalog Features Average current mode, Continuous Control Mode, Enable, OVP, Overvoltage protection, Supports Flyback Duty cycle (max) (%) 100
Vin (max) (V) 18 Operating temperature range (°C) -55 to 125 Control mode CCM Topology Boost, PFC controller Rating Catalog Features Average current mode, Continuous Control Mode, Enable, OVP, Overvoltage protection, Supports Flyback Duty cycle (max) (%) 100
SOIC (DW) 20 131.84 mm² 12.8 x 10.3
  • Combines PFC and Downstream Converter Controls
  • Controls Boost Preregulator to Near-Unity Power Factor
  • Accurate Power Limiting
  • Improved Feedforward Line Regulation
  • Peak Current-Mode Control in Second Stage
  • Programmable Oscillator
  • Leading-Edge/Trailing-Edge Modulation for Reduced Output Ripple
  • Low Start-up Supply Current
  • Synchronized Second Stage Start-Up, with Programmable Soft-start
  • Programmable Second Stage Shutdown

  • Combines PFC and Downstream Converter Controls
  • Controls Boost Preregulator to Near-Unity Power Factor
  • Accurate Power Limiting
  • Improved Feedforward Line Regulation
  • Peak Current-Mode Control in Second Stage
  • Programmable Oscillator
  • Leading-Edge/Trailing-Edge Modulation for Reduced Output Ripple
  • Low Start-up Supply Current
  • Synchronized Second Stage Start-Up, with Programmable Soft-start
  • Programmable Second Stage Shutdown

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.

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.

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* Data sheet BiCMOS PFC/PWM Combination Controller datasheet (Rev. C) 08 nov 2001

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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