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FAN4800I − Power Factor Correction (PFC) and PWM Controller Combo
| Obsolete as of 12-Mar-2013 |
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.
Product Status/Packaging
| Product | Product & Eco Status | Replacement Part Number | Packaging & Packing Info | **Package Marking Convention | Qualification Support | Compliance Certificates |
|---|---|---|---|---|---|---|
| FAN4800IN_G |
Obsolete as of 12-Mar-2013 Green as of Jun 2010 |
MDIP 16L Details RAIL |
Line 1:$Y (Fairchild logo) &Z (Plant Code) &4 (4-Digit Date Code) &K
Line 2:FAN4800IN
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RTHETA (JA) :
80
°C/W Moisture Sensitivity Level (MSL) : NA Max Reflow Temp : 999 |
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| FAN4800IN |
Obsolete as of 21-Sep-2011 ROHS Compliant |
MDIP 16L Details RAIL |
Line 1:$Y (Fairchild logo) &Z (Plant Code) &4 (4-Digit Date Code) &K |
RTHETA (JA) :
80
°C/W Moisture Sensitivity Level (MSL) : NA Max Reflow Temp : 999 |
Features
- Low start-up 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 operation
- 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 in 16-DIP package
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