FAN4800IN_G
FAN4800IN_G Datasheet
FAN4800 Low Startup Current PFC/PWM Controller Combinations
| Part | Datasheet |
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FAN4800IN_G |
FAN4800IN_G (pdf) |
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| FAN4800 Low Startup Current PFC/PWM Controller Combinations November 2010 FAN4800 Low Startup Current PFC/PWM Controller Combinations - Low Startup Current 100µA Typical - Low Operating Current 2.5mA Typical - Low Total Harmonic Distortion, High Power Factor - Pin-Compatible Upgrade for the ML4800 - Average Current, Continuous or Discontinuous Boost, Leading-Edge PFC - Slew Rate Enhanced Transconductance Error Amplifier for Ultra-Fast PFC Response - Internally Synchronized Leading-Edge PFC and Trailing-Edge PWM - Reduction of Ripple Current in the Storage Capacitor between the PFC and PWM Sections - PWM Configurable for Current Mode or Voltage Mode - Additional Folded-Back Current Limit for PWM Section - 20V BiCMOS Process - VIN OK Guaranteed Turn-on PWM at 2.25V - VCC OVP Comparator, Low-Power Detect Comparator - Current-Fed Gain Modulator for Improved Noise Immunity - Brownout Control, Over-Voltage Protection, UVLO, Soft-Start, and Reference OK - Available in16-DIP Package - Desktop PC Power Supply - Internet Server Power Supply - Uninterruptible Power Supply UPS - Battery Charger - DC Motor Power Supply - Monitor Power Supply - Telecom System Power Supply - Distributed Power The FAN4800 is a controller for power-factor-corrected, switched-mode power supplies. Power Factor Correction PFC allows the use of smaller, lower-cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply that fully complies with IEC-1000-3-2 specifications. Intended as a BiCMOS version of the industry-standard ML4800, the FAN4800 includes circuits for the implementation of leading-edge, average-current, boost-type power factor correction and a trailing-edge Pulse Width Modulator PWM . A gate driver with 1A capabilities minimizes the need for external driver circuits. Low-power requirements improve efficiency and reduce component costs. An over-voltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting and input voltage brownout protection. The PWM section can be operated in current or voltage mode, at up to 250kHz, and includes an accurate 50% duty cycle limit to prevent transformer saturation. The FAN4800 includes a folded-back current limit for the PWM section to provide short-circuit protection. 16-PDIP Ordering Information FAN4800IN FAN4800IN_G Operating Temperature Range -40°C to +125°C -40°C to +125°C Package 16-PDIP 16-PDIP Packing Method Rail Marking Code FAN4800 FAN4800 Low Startup Current PFC/PWM Controller Combinations Block Diagram 16 VEAO 15 VFB 2.5V 0.3V 2 IAC 4 VRMS 3 ISENSE RAMP1 7 GAIN MODULATOR 1 IEAO Low Power Detector 3.5k POWER FACTOR CORRECTOR VCC 17.9V VCC OVP 2.78V TRI-FAULT PFC OVP 0.5V -1V 3.5k PFC CMP PFC ILIMIT OSCILLATOR 13 VCC 7.5V REFERENCE VREF 14 PFC OUT 12 8 RAMP2 6 VDC 0.9V 20uA VREF 9 DC ILIMIT PWM CMP |
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