L4981A

... 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- L4981A L4981B SO20 ...

... To limit the number of the external components, the device integrates pro- tections as overvoltage and overcurrent. The overcurrent level can be programmed using a simple resistor for L4981A. For a better precision and for L4981B an external divider must be used. Parameter 50mA) (*) ...

... Power ground. 2 IPK L4981A peak current limiting. A current limitation is obtained using a single resistor connected between Pin 2 and the sense resistor. To have a better precision another resistor between Pin 2 and a reference voltage (Pin 11) must be added. L4981B peak current limiting. A precise current limitation is obtained using two external resistor only ...

... Frequency Stability V Ramp Valley to Peak svp I Charge Current 18C I Discharge Current 18D V Ramp Valley Voltage 18 SYNC SECTION (Only for L4981A) t Output Pulse Width W I Sink Current with Low Output 16 Voltage -I Source Current with High Output 16 Voltage V Low Input Voltage 16L ...

... SINK I = 250mA SOURCE V = 15V 1nF OUT C = 1nF OUT I = 0mA SOURCE V = 14V 0V IAC COSC Pin17 = Open Pin20 = 1nF (*) Pin 220K CC Pin15 to GND = 33K 5.3V 6 L4981A - L4981B Min. Typ. Max. Unit 19 5 ref ref -20mV +20mV 180 250 320 mV 0. 0.4 0 105 ...

... L4981A - L4981B ELECTRICAL CHARACTERISTICS (continued) Symbol Prameter MULTIPLIER SECTION Multipler Output Current K Multiplier Gain V VA OUT MULT OUT LFF REF MULT OUT AC where Figure 1: MULTI-OUT vs 5.1V) LFFD 6/16 Test Condition V = 4V, V VA-OUT RMS MULTOUT LFF OSC 4V, V VA-OUT RMS MULTOUT LFF ...

... Figure 3: MULTI-OUT vs 5.1V) LFFD Figure 5: MULTI-OUT vs 2.5V) LFFD Figure 7: MULTI-OUT vs 2.5V) LFFD (V = 4.4V; Figure 4: MULTI-OUT vs. I RMS (V = 1.7V; Figure 6: MULTI-OUT vs. I RMS (V = 4.4V; Figure 8: MULTI-OUT vs. I RMS L4981A - L4981B (V = 5.3V; AC RMS V = 5.1V) LFFD (V = 2.2V; AC RMS V = 2.5V) LFFD (V = 5.3V; AC RMS V = 2.5V) LFFD 7/16 ...

... L4981A - L4981B Figure 9A: L4981A Power Factor Corrector (200W) R17 806K 1% R17 806K 1% FUSE BRIDGE BY214 220nF Vi 400V 88V AC to 254V AC R11 NTC 560 1% R21 5. 80kHz 200W OUT Figure 9B: L4981B Power Factor Corrector (200W) R17 806K 1% R17 806K 1% R22 1.1M FUSE BRIDGE ...

... Figure 10: Reference Voltage vs. Source Refer- ence Current Figure 12: Reference Voltage vs. Junction Tem- perature Figure 14: Gate Driver Rise and Fall Time L4981A - L4981B Figure 11: Reference Voltage vs. Supply Voltage Figure 13: Switching Frequency vs. Junction Temperature Figure 15: Operating Supply Current vs. Supply Voltage 9/16 ...

... L4981A - L4981B Figure 16: Programmable Under Voltage Lock- out Thresholds R23 (Kohm) Table 1: Programmable Under Voltage Lockout Thresholds 11V 12V 13V 14V 14.5V 15V Figure 18: Oscillator Diagram 10/16 Figure 17: Modulation Frequency Normalized 0.8 R22 = R23 6.8 0.4 0 OFF 10V 10.1V 10.5V 10.8V 10 ...

... L4981A/ B R10 5k TP1 R15 R1 17k 2.2k 3.3n 1n 24k 460 R13 2.2k R9 (RS) 50m // 3*0.15) L4981A - L4981B VCC C10 D4-STTH8R06 150uF NTC to220 (/40CW) 2.5 V+ BUS=400V D5- STTA106 R19 750k R22 D6 R18 L2 750k C14 DZW06-48 6.8 3u 100n 2W R20 R23 750k D7-STTA406 750k 14 3 ...

... L4981A - L4981B Figure 20: P.C.B. Component Side (Dimensions 88 x 150mm). Figure 20: P.C.B. Solder Side (Dimensions 88 x 150mm). 12/16 ...

... AN628 - DESIGNING A HIGH POWER FACTOR SWITCHING PREREGULATOR WITH THE L4981 CONTINUOUS MODE V P out in 404Vdc 397W 406Vdc 395W 407Vdc 394W V P out in 410Vdc 394W 412Vdc 395W 412Vdc 395W L4981A - L4981B THD PF 5% 0.998 2.2% 0.999 3% 0.999 THD PF 4.7% 0.997 6.4% 0.993 8.1% 0.987 Eff. .92 .94 .945 Eff. ...

... L4981A - L4981B mm DIM. MIN. TYP. MAX. A 2.35 2.65 0.093 A1 0.1 0.3 0.004 B 0.33 0.51 0.013 C 0.23 0.32 0.009 D 12.6 13 0.496 E 7.4 7.6 0.291 e 1. 10.65 0.394 h 0.25 0.75 0.010 L 0.4 1.27 0.016 K 0˚ (min.)8˚ (max 14/16 inch MIN. TYP. ...

... MIN. TYP. MAX. MIN. a1 0.254 0.010 B 1.39 1.65 0.055 b 0.45 b1 0.25 D 25.4 E 8.5 e 2.54 e3 22.86 F 7.1 I 3.93 L 3.3 Z 1.34 inch MECHANICAL DATA TYP. MAX. 0.065 0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053 L4981A - L4981B OUTLINE AND DIP20 15/16 ...

... L4981A - L4981B Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice ...