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L4981X Datasheet(PDF) 2 Page - STMicroelectronics |
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L4981X Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 17 page  put filter; both the operating frequency modes working with an average current mode PWM con- troller, maintaining sinusoidal line current without slope compensation. Besides power MOSFET gate driver, precise volt- age reference (externally available), error ampli- fier, undervoltage lockout, current sense and the soft start are included. 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. ABSOLUTE MAXIMUM RATINGS Symbol Pin Parameter Value Unit VCC 19 Supply Voltage (ICC ≤50mA) (*) selflimit V IGDRV 20 Gate driv. output peak current (t = 1 µs) SINK 2 Α . SOURCE 1.5 A VGDRV Gate driv. output voltage t = 0.1 µs-1 V Voltages at pins 3, 14, 7, 6, 12, 15 -0.3 to 9 V VVA-OUT 13 Error Amplifier Voltage -0.3 to 8.5 V IAC 4 AC Input Current 5 mA Voltages at pin 8, 9 -0.5 to 7 V VCA-OUT 5 Current Amplifier Volt. (Isource = -20mA; Isink = 20mA) -0.3 to 8.5 V VROSC 17 Voltage at pin 17 -0.3 to 3 V 11, 18 Voltage at pin 11, 18 -0.3 to 7 V ICOSC 18 Input Sink Current 15 mA IFREQ-MOD 16 Frequency Modulation Sink Current (L4981B) 5 mA VSYNC 16 Sync. Voltage (L4981A) -0.3 to 7 V VIPK 2 Voltage at pin 2 Voltage at Pin 2 t = 1 µs -0.3 to 5.5 -2 V V Ptot Power Dissipation at Tamb =70 °C (DIP20) 1 W Power Dissipation at Tamb =70 °C (SO20) 0.6 W Top Operating Ambient Temperature -40 to 125 °C Tstg StorageTemperature -55 to 150 °C (*) Maximum package power dissipation limits must be observed. PIN CONNECTIONS (Top views) L4981A L4981B L4981A - L4981B 2/17 |
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Similar Description - L4981X |
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