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ML4823IP, ML4823IS, ML4824

Table of contents:
Info of ML4823IP
Info of ML4823IS
Info of ML4824

ML4823IP, ML4823IS, ML4824 Selling Leads, Datasheet

MFG:Fairchild Package Cooled:N/A D/C:02+

ML4823IP, ML4823IS, ML4824 Datasheet download

Five Points

Part Number: ML4823IP

MFG: Fairchild

Package Cooled: N/A

D/C: 02+

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ML4824 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, averag current, "boost" type power factor correction and a trailing edge, pulse width modulator (PWM). The device is available in two versions; the ML4824-1 (fPWM = fPFC) and the ML4824-2 (fPWM = 2 x fPFC). 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 brownout 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.

ML4824 Maximum Ratings

VCC Shunt Regulator Current ................................. 55mA
ISENSE Voltage .................................................3V to 5V
Voltage on Any Other Pin ...... GND 0.3V to VCCZ + 0.3V
IREF .......................................................................20mA
IAC Input Current ................................................. 10mA
Peak PFC OUT Current, Source or Sink ............... 500mA
Peak PWM OUT Current, Source or Sink ............. 500mA
PFC OUT, PWM OUT Energy Per Cycle ................... 1.5J
Junction Temperature .......................................... 150°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................ 260°C
Thermal Resistance (qJA)
Plastic DIP ....................................................... 80°C/W
Plastic SOIC ................................................... 105°C/W

ML4824 Features

Internally synchronized PFC and PWM in one IC
Low total harmonic distortion
Reduces ripple current in the storage capacitor between the 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 configured for current mode or voltage mode operation
Average line voltage compensation with brownout control
PFC overvoltage comparator eliminates output "runaway" due to load removal
Current fed gain modulator for improved noise immunity
Overvoltage protection, UVLO, and soft start

ML4824 Connection Diagram

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