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ML4841CP

Description
Power Factor Correction - PFC PFC Controller PWM Combo
Categorysemiconductor    Power management   
File Size127KB,15 Pages
ManufacturerON Semiconductor
Websitehttp://www.onsemi.cn
Environmental Compliance
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ML4841CP Overview

Power Factor Correction - PFC PFC Controller PWM Combo

ML4841CP Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerON Semiconductor
Product CategoryPower Factor Correction - PFC
RoHSDetails
Switching Frequency200 kHz
Minimum Operating Temperature- 65 C
Maximum Operating Temperature+ 150 C
Mounting StyleThrough Hole
Package / CasePDIP-16
PackagingTube
Height3.42 mm
Length19.68 mm
TypeVariable Feedforward PFC/PWM Controller Combo
Width6.6 mm
Factory Pack Quantity25
Unit Weight0.057419 oz
www.fairchildsemi.com
ML4841
Variable Feedforward PFC/PWM Controller Combo
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 mode, boost type, leading
edge PFC
• High efficiency trailing edge PWM can be configured for
current mode or voltage mode operation
• Average line voltage compensation with brown-out
control
• PFC overvoltage comparator eliminates output
“runaway” due to load removal
• Current fed multiplier for improved noise immunity
• Overvoltage protection, UVLO, and soft start
General Description
The ML4841 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 specifications. The ML4841 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 PFC frequency of the ML4841 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 compara-
tor 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.
Block Diagram
16
VEAO
VFB
15
2.5V
IAC
2
VRMS
4
ISENSE
3
RAMP 1
8
RTCT
7
RAMP 2
9
8V
VDC
6
VCC
SS
5
8V
50µA
1.25V
-
+
-
+
1
IEAO
POWER FACTOR CORRECTOR
OVP
+
+
+
-
13
VCC
VCCZ
13.5V
7.5V
REFERENCE
S
-1V
+
-
VEA
-
+
VREF
14
3.5kΩ
-
IEA
2.7V
-
Q
GAIN
MODULATOR
3.5kΩ
8V
R
S
Q
PFC OUT
Q
12
PFC ILIMIT
R
Q
OSCILLATOR
÷2
DUTY CYCLE
LIMIT
PWM OUT
S
VFB
2.5V
-
+
Q
VIN OK
+
11
R
DC ILIMIT
Q
1V
-
PULSE WIDTH MODULATOR
VCCZ
UVLO
REV. 1.0.3 6/13/01
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