L4984 CCM PFC CONTROLLER_BDTIC 代理L4984

L4984 CCM PFC CONTROLLER

The L4984 is a current-mode PFC controller operating with line-modulated fixed-off-time (LM-FOT) control. A proprietary LM-FOT modulator allows fixed-frequency operation for boost PFC converters as long as they are operated in CCM (continuous conduction mode).

The chip comes in a 10-pin SO package and offers a low-cost solution for CCM-operated boost PFC pre-regulators in EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans from few hundred W to 1 KW and above.

The highly linear multiplier includes a special circuit, able to reduce the crossover distortion of the AC input current, that allows wide-range-mains operation with a reasonably low THD, even over a large load range.

The output voltage is controlled by means of a voltage-mode error amplifier and an accurate (1% at Tj = 25 °C) internal voltage reference. Loop stability is optimized by the voltage feedforward function (1/V2correction), which in this IC uses a proprietary technique that also significantly improves line transient response in the case of mains drops and surges (“bi-directional”).

The device features low consumption and includes a disable function suitable for IC remote on/off. These features allow use in applications which also comply with the latest energy saving requirements (Blue Angel, ENERGY STAR, Energy2000, etc.).

In addition to overvoltage protection able to keep the output voltage under control during transient conditions, the IC is also provided with protection against feedback loop failures or erroneous settings. Other onboard protection functions allow that brownout conditions and boost inductor saturation can be safely handled. Soft-start limits peak current and extends off-time to prevent flux runaway in the initial cycles.

The totem pole output stage, capable of 600 mA source and 800 mA sink current, is suitable for big MOSFETs or IGBT drive.

技术特性

Line-modulated fixed-off-time (LM-FOT) control of CCM-operated PFC pre-regulators
Proprietary LM-FOT modulator for nearly fixed-frequency operation
Proprietary multiplier design for minimum THD of AC input current
Fast “bi-directional” input voltage feedforward (1/V2correction)
Accurate adjustable output overvoltage protection
Protection against feedback loop failure (latched shutdown)
Inductor saturation protection
AC brownout detection
Digital leading-edge blanking on current sense
Soft-start
1% (at Tj = 25 °C) internal reference voltage
- 600 / + 800 mA totem pole gate driver with active pull-down during UVLO and voltage clamp
SSOP10 package

应用领域

PFC pre-regulators for:
– IEC61000-3-2 and JEIDA-MITI compliant SMPS in excess of 1 KW
– Desktop PC, server, web server

管脚定义图

L4984 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
L4984DTR	Active		1000	SSOP 10	Tape And Reel
L4984D	Active		1000	SSOP 10	Tube

DATASHEET

描述	版本	大小
L4984 : DS9192: CCM PFC controller	1	4435KB