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ML4841CP Datasheet

  • ML4841CP

  • Fairchild Semiconductor [Variable Feedforward PFC/PWM Contr...

  • 130.62KB

  • FAIRCHILD

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ML4841
Variable Feedforward PFC/PWM Controller Combo
Features
鈥?Internally synchronized PFC and PWM in one IC
鈥?Low total harmonic distortion
鈥?Reduces ripple current in the storage capacitor between
the PFC and PWM sections
鈥?Average current, continuous mode, boost type, leading
edge PFC
鈥?High ef铿乧iency trailing edge PWM can be con铿乬ured for
current mode or voltage mode operation
鈥?Average line voltage compensation with brown-out
control
鈥?PFC overvoltage comparator eliminates output
鈥渞unaway鈥?due to load removal
鈥?Current fed multiplier for improved noise immunity
鈥?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 speci铿乧ations. The ML4841 includes circuits
for the implementation of a leading edge, average current,
鈥渂oost鈥?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
50碌A
1.25V
-
+
-
+
1
IEAO
POWER FACTOR CORRECTOR
OVP
+
+
+
-
13
VCC
VCCZ
13.5V
7.5V
REFERENCE
S
-1V
+
-
VEA
-
+
VREF
14
3.5k鈩?/div>
-
IEA
2.7V
-
Q
GAIN
MODULATOR
3.5k鈩?/div>
8V
R
S
Q
PFC OUT
Q
12
PFC ILIMIT
R
Q
OSCILLATOR
梅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

ML4841CP 产品属性

  • 25

  • 集成电路 (IC)

  • PMIC - PFC（功率因数修正）

  • -

  • 平均电流

  • 200kHz

  • -

  • 0 V ~ 7 V

  • 0°C ~ 70°C

  • 通孔

  • 16-DIP（0.300"，7.62mm）

  • 16-DIP

  • 带卷 (TR)

  • ML4841CP_NLML4841CP_NL-ND

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