Product Details
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DESCRIPTION The L4981 I.C. provides the necessary features to achieve a very high power factor up to 0.99. Realized in BCD 60II technology this power factor corrector (PFC) pre-regulator contains all the control functions for designing a high efficiency-mode power supply with sinusoidal line current con sumption. The L4981 can be easily used in systems with mains voltages between 85V to 265V without any line switch. This new PFC offers the possibility to work at fixed frequency (L4981A) or modulated frequency (L4981B) optimizing the size of the in put filter; both the operating frequency modes working with an average current mode PWM controller, maintaining sinusoidal line current without slope compensation. ■ CONTROL BOOST PWM UP TO 0.99P.F. ■ LIMIT LINE CURRENT DISTORTION TO < 5 ■ UNIVERSAL INPUT MAINS ■ FEED FORWARD LINE AND LOAD REGULATION ■ AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY ■ HIGH CURRENT BIPOLAR AND DMOS TOTEM POLE OUTPUT ■ LOW START-UP CURRENT (0.3mA TYP.) ■ UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD ■ OVERVOLTAGE, OVERCURRENT PROTECTION ■ PRECISE 2 ON CHIP REFERENCE EXTERNALLY AVAILABLE ■ SOFT START |
Product Description
| TYPE | DESCRIPTION |
| ANSC PART# | ANSC- L4981B |
| Category |
Integrated Circuits (ICs) |
| Power Management (PMIC) | |
| PFC (Power Factor Correction) | |
| Manufacturer | Original |
| Series | - |
| Packaging | Tube |
| Part Status | Obsolete |
| Mode | Average Current |
| Frequency - Switching | 100kHz |
| Current - Startup | 100 µA |
| Voltage - Supply | 14.5V ~ 19.5V |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-DIP |
| Base Product Number | L4981 |
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