Datasheet > ML4827IP-2

ML4827IP-2

更新时间： 2024-01-06 14:45:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正控制器
页数	文件大小	规格书
16页	138K
描述
Fault-Protected PFC and PWM Controller Combo

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中文翻译

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数据手册

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ML4827IP-2 数据手册

www.fairchildsemi.com

ML4827

Fault-Protected PFC and PWM Controller Combo

necessary for conformance to the safety requirements of

UL1950. A direct descendent of the industry-standard

Features

• Pin-compatible with industry-standard ML4824-1

ML4824-1, the ML4827 adds a TriFault Detect™ function to

• TriFault Detect™ to conform to UL1950™ requirements

guarantee that no unsafe conditions may result from single

• Available in 50% or 74% max duty cycle versions

component failure in the PFC. Power Factor Correction

• Low total harmonic distortion

(PFC) allows the use of smaller, lower cost bulk capacitors,

• Reduces ripple current in the storage capacitor between

reduces power line loading and stress on the switching FETs,

the PFC and PWM sections

and results in a power supply that fully complies with

• Average current, continuous boost leading edge PFC

IEC1000-3-2 speciﬁcation. The ML4827 includes circuits

• High efﬁciency trailing-edge PWM can be conﬁgured for

for the implementation of a leading edge, average current,

current mode or voltage mode operation

• Average line voltage compensation with brown-out

“boost” type power factor correction and a trailing edge,

pulse width modulator (PWM). The device is available in

control

two versions; the ML4827-1 (Duty Cycle

the ML4827-2 (Duty Cycle

MAX

= 50%) and

= 74%). The higher

MAX

• PFC overvoltage comparator eliminates output

“runaway” due to load removal

• Current fed gain modulator for improved noise immunity

• Overvoltage protection, UVLO, and soft start

maximum duty cycle of the -2 allows enhanced utilization of

a given transformer core’s power handling capacity. 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, and includes a duty cycle limit to prevent

transformer saturation.

General Description

The ML4827 is a controller for power factor corrected,

switched mode power supplies, that includes circuitry

Block Diagram

2µA

POWER FACTOR CORRECTOR

BROKEN WIRE

VEAO

VEA

IEAO

CCZ

REF

OVP

REF

7.5V

REFERENCE

13.5V

–

IEA

COMPARATOR

3.5kΩ

–

2.7V

2.5V

0.5V

–

–1V

–

GAIN

MODULATOR

RMS

PFC OUT

3.5kΩ

PFC I

LIMIT

SENSE

RAMP 1

OSCILLATOR

RAMP 2

DUTY CYCLE

LIMIT

–

1.25V

PWM OUT

–

50µA

–

2.5V

GND

DC I

LIMIT

DC I

LIMIT

UVLO

CCZ

PULSE WIDTH MODULATOR

REV. 1.0.1 6/27/01

12 3 4 5 6 7...16

中文翻译

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与ML4827IP-2相关器件

型号	品牌	获取价格	描述	数据表
ML4827IS-1	MICRO-LINEAR	获取价格	Fault-Protected PFC and PWM Controller Combo
ML4827IS-2	FAIRCHILD	获取价格	Fault-Protected PFC and PWM Controller Combo
ML4827IS-2	MICRO-LINEAR	获取价格	Fault-Protected PFC and PWM Controller Combo
ML4828	MICRO-LINEAR	获取价格	BiCMOS Phase Modulation/Soft Switching Controller
ML4828CP	MICRO-LINEAR	获取价格	BiCMOS Phase Modulation/Soft Switching Controller
ML4828CS	MICRO-LINEAR	获取价格	BiCMOS Phase Modulation/Soft Switching Controller
ML4828IP	MICRO-LINEAR	获取价格	BiCMOS Phase Modulation/Soft Switching Controller
ML4828IS	MICRO-LINEAR	获取价格	BiCMOS Phase Modulation/Soft Switching Controller
ML483	TRIQUINT	获取价格	0.7-10GHz HIgh IP3 Mixer with Integrated LO AMP
ML4830	MICRO-LINEAR	获取价格	Electronic Ballast Controller

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