PFC-CCM (continuous conduction mode) ICs

Achieve high efficiency at lower system cost

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Overview

PFC-CCM controllers employ BiCMOS technology. They offer advantages such as wider VCC operating range, improved internal oscillator and additional direct bulk capacitor overvoltage protection. The PFC-CCM controllers are able to achieve 95% efficiency at full load for all input voltage range.

Key Features

  • Direct sensing, input brown-out detection with hysteresis
  • 95% efficiency at full load
  • Few external components
  • Integrated digital voltage loop compensation
  • Programmable switching 20 kHz- 100 kHz
  • Max. duty cycle of 95% (typ)
  • Vcc undervoltage lockout
  • Low peak current limit threshold
  • Second overvoltage protection
  • Output undervoltage detection
  • PFC enable function
  • Fulfills Class D spec. IEC1000-3-2

Products

About

3rd-generation PFC-CCM controller IC ICE3PCS01G

The 3rd generation has the lowest internal reference trimmed at 2.5 V and integrated digital control voltage loop. It has low peak current limit at 0.2 V, adjustable gate switching frequency range from 21 kHz to 100 kHz, and is able to synchronize with external frequency range from 50 kHz to 100 kHz. 95% efficiency at full load can be achieved for all input voltage ranges. The 0.2 V peak current limitation threshold reduces the power loss on shunt resistor. Dedicated protection features for computing PSU applications can reduce the system BOM cost. Trimmed internal parameters with tight tolerance make mass production reliable. New functions are available in the latest third generation. PFC CCM has boost follower mode, second OVP, VBOK signal, external enable control, and others. In addition to that, the voltage loop uses digital compensation and control, which improves the dynamic response and enables further BOM reduction in the system application.

2nd generation of CCM PFC IC ICE2PCS0x/G

ICE2PCS0xG is the 2nd generation of continuous conduction mode (CCM) PFC controllers that employ BiCMOS technology. This 8-pin CCM IC provides a simple procedure for designers and built-in protection features to save system BOM cost and enhance system safety. Compared to the previous generation, they have a lower internal reference trimmed at 3 V among other advantages such as a wider VCC operating range, improved internal oscillator, and additional direct bulk capacitor overvoltage protection. The second generation of PFC CCM has a total of 5 derivatives that you can get off the shelves. These devices provide two adjustable switching frequencies and three fixed switching frequencies, and come with brownout protection.

Major differences between 2nd and 3rd gen. CCM PFC

1. Voltage loop: For ICE2PCxx, compensation of the voltage loop is installed at the VCOMP pin; however, in ICE3PCS, compensation of the voltage loop is installed inside the IC with digital control.

 2. Current sensing: ICE2PC provides soft overcurrent (SOC) protection at -0.71 V with a peak current limit (PCL) at -1 V.  ICE3PC does not provide SOC, and has lower peak current limit threshold as low as -0.2 V to save system power loss on the shunt resistor (RSHUNT).

3. Dynamic response: Induced input current distortion during startup and load dynamic where bulk voltage varies over +5 % detection window of EDR block design in ICE2PCS0x. ICE3PCS0x has removed the EDR and bulk voltage dynamic response is improved and guaranteed by the integrated digital voltage loop.

 4. Operating switching frequency: ICE2PC has both fixed and adjustable switching frequency. ICE3PC is able to synchronize with an external PWM signal.

3rd-generation PFC-CCM controller IC ICE3PCS01G

The 3rd generation has the lowest internal reference trimmed at 2.5 V and integrated digital control voltage loop. It has low peak current limit at 0.2 V, adjustable gate switching frequency range from 21 kHz to 100 kHz, and is able to synchronize with external frequency range from 50 kHz to 100 kHz. 95% efficiency at full load can be achieved for all input voltage ranges. The 0.2 V peak current limitation threshold reduces the power loss on shunt resistor. Dedicated protection features for computing PSU applications can reduce the system BOM cost. Trimmed internal parameters with tight tolerance make mass production reliable. New functions are available in the latest third generation. PFC CCM has boost follower mode, second OVP, VBOK signal, external enable control, and others. In addition to that, the voltage loop uses digital compensation and control, which improves the dynamic response and enables further BOM reduction in the system application.

2nd generation of CCM PFC IC ICE2PCS0x/G

ICE2PCS0xG is the 2nd generation of continuous conduction mode (CCM) PFC controllers that employ BiCMOS technology. This 8-pin CCM IC provides a simple procedure for designers and built-in protection features to save system BOM cost and enhance system safety. Compared to the previous generation, they have a lower internal reference trimmed at 3 V among other advantages such as a wider VCC operating range, improved internal oscillator, and additional direct bulk capacitor overvoltage protection. The second generation of PFC CCM has a total of 5 derivatives that you can get off the shelves. These devices provide two adjustable switching frequencies and three fixed switching frequencies, and come with brownout protection.

Major differences between 2nd and 3rd gen. CCM PFC

1. Voltage loop: For ICE2PCxx, compensation of the voltage loop is installed at the VCOMP pin; however, in ICE3PCS, compensation of the voltage loop is installed inside the IC with digital control.

 2. Current sensing: ICE2PC provides soft overcurrent (SOC) protection at -0.71 V with a peak current limit (PCL) at -1 V.  ICE3PC does not provide SOC, and has lower peak current limit threshold as low as -0.2 V to save system power loss on the shunt resistor (RSHUNT).

3. Dynamic response: Induced input current distortion during startup and load dynamic where bulk voltage varies over +5 % detection window of EDR block design in ICE2PCS0x. ICE3PCS0x has removed the EDR and bulk voltage dynamic response is improved and guaranteed by the integrated digital voltage loop.

 4. Operating switching frequency: ICE2PC has both fixed and adjustable switching frequency. ICE3PC is able to synchronize with an external PWM signal.

Documents

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Design resources

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