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ML4805CP

Description
Variable Feedforward PFC/PWM Controller Combo
CategoryPower/power management    The power supply circuit   
File Size126KB,13 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
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ML4805CP Overview

Variable Feedforward PFC/PWM Controller Combo

ML4805CP Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerFairchild
Parts packaging codeDIP
package instructionDIP, DIP18,.3
Contacts18
Reach Compliance Codeunknown
ECCN codeEAR99
Other featuresCAN ALSO BE OPERATED IN CURRENT MODE
Analog Integrated Circuits - Other TypesPOWER FACTOR CONTROLLER WITH POST REGULATOR
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage16.5 V
Minimum input voltage10.6 V
Nominal input voltage15 V
JESD-30 codeR-PDIP-T18
JESD-609 codee0
length22.86 mm
Number of functions1
Number of terminals18
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current0.5 A
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP18,.3
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height4.32 mm
surface mountNO
Switch configurationSINGLE
Maximum switching frequency212 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.62 mm
November 1998
PRELIMINARY
ML4805
Variable Feedforward PFC/PWM Controller Combo
GENERAL DESCRIPTION
The ML4805 is a controller for power factor corrected,
switched mode power supplies. Similar to the ML4801,
the ML4805 may be used for voltage mode operation. Key
features of this combined PFC and PWM controller are
low start-up and operating currents. 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 specifications. The
ML4805 includes circuits for the implementation of a
leading edge, average current “boost” type power factor
correction and a trailing edge pulse width modulator.
The PFC frequency of the ML4805 is automatically set at
half that of the PWM frequency generated by the internal
oscillator. This technique allows the user to design with
smaller output components while maintaining the
optimum 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.
FEATURES
I
I
I
I
I
Internally synchronized PFC and PWM in one IC
Low start-up current (200µA typ.)
Low operating current (5.5mA typ.)
Low total harmonic distortion
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
Average current continuous boost leading edge PFC
High efficiency trailing edge PWM optimized for
voltage mode operation
Current fed gain modulator for improved noise
immunity
Brown-out control, overvoltage protection, UVLO, and
soft start
I
I
I
I
BLOCK DIAGRAM
18
VEAO
VFB
17
2.5V
IAC
2
VRMS
4
ISENSE
3
RAMP 1
8
RTCT
7
RAMP 2
9
8V
VDC
6
VCC
SS
5
AGND
11
PULSE WIDTH MODULATOR
VCC
UVLO
8V
25µA
1.25V
-
+
-
+
-
+
1
IEAO
POWER FACTOR CORRECTOR
OVP
1.6kΩ
+
15
VCC
VCC
7.5V
REFERENCE
S
-1V
+
-
+
+
-
VEA
VREF
16
IEA
2.75V
-
Q
GAIN
MODULATOR
1.6kΩ
R
S
Q
PFC OUT
Q
14
PFC ILIMIT
R
Q
OSCILLATOR
÷2
PGND
DUTY CYCLE
LIMIT
12
PWM OUT
VIN OK
VFB
2.5V
-
+
+
S
Q
13
R
DC ILIMIT
Q
ILIM
10
1.5V
-
REV. 1.1 3/9/2001

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