ML4824-1

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Power Factor Correction (PFC) and PWM Controller Combo

General Description

The ML4824 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 IEC1000-2-3 specification. The ML4824 includes circuits for the implementation of a leading edge, average current, "boost" type power factor correction and a trailing edge, pulse width modulator (PWM). The device is available in two versions; the ML4824-1 (f_PWM = f_PFC) and the ML4824-2 (f_PWM = 2 x f_PFC). Doubling the switching frequency of the PWM allows the user to design with smaller output components while maintaining the best operating frequency for the PFC. 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 brown-out protection. The PWM section can be operated in current or voltage mode at up to 250kHz and includes a duty cycle limit to prevent transformer saturation.

Product Status/Pricing/Packing

Fairchild 1,000 piece Budgetary Pricing. *
If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
Top mark packaging information for product ML4824-1 is available. **

Product	Product Status	Eco Status	*Pricing	Package Type	Leads	Packing Method	**Package Marking Convention
ML4824CP1	Full Production	Green as of Mar 2011	$3.79	MDIP 16-LEAD	16	RAIL	Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2:ML4824CP1
ML4824CS1X	Full Production	Green as of Feb 2010	$4.14	SOIC-Wide	16	TAPE REEL	Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:ML4824CS1
ML4824IS1X	Full Production	Green as of Feb 2010	$5.98	SOIC-Wide	16	TAPE REEL	Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:ML4824IS1

Customer qualification data for the ML4824IS1X
Customer qualification data for the ML4824CS1X
Customer qualification data for the ML4824CP1

Features

Internally synchronized PFC and PWM in one IC
Low total harmonic distortion
Reduces ripple current in the storage capacitor betweenthe PFC and PWM sections
Average current, continuous boost leading edge PFC
Fast transconductance error amp for voltage loop
High efficiency trailing edge PWM can be configuredfor current mode or voltage mode operation
Average line voltage compensation with brownoutcontrol
PFC overvoltage comparator eliminates output"runaway" due to load removal
Current fed gain modulator for improved noise immunity
Overvoltage protection, UVLO, and soft start