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L4981BD Datasheet(PDF) 4 Page - STMicroelectronics |
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L4981BD Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 17 page  ELECTRICAL CHARACTERISTICS (Unless otherwise specified VCC = 18V, COSC = 1nF, ROSC = 24K Ω,CSS =1µF, VCA-OUT = 3.5V, VISENSE = 0V, VLFF =VREF,IAC = 100µA, VRMS = 1V, VFEED = GND, VIPK = 1V, VOVP = 1V, TJ =25 °C Symbol Prameter Test Condition Min. Typ. Max. Unit ERROR AMPLIFIER SECTION VIO Input Offset Voltage –25 °C< TJ <85°C ±8mV IIB Input Bias Current VFEED = 0V -500 -50 500 nA Open Loop Gain 70 100 dB V13H Output High voltage VFEED = 4.7V IVA-OUT = -0.5mA 5.5 6.5 7.5 V V13L Output Low Voltage VFEED = 5.5V IVA-OUT = 0.5mA 0.4 1 V -I13 Output Source Current VFEED = 4.7V; VVA-OUT = 3.5V 2 10 mA I13 Output Sink Current VFEED = 5.5V; VVA-OUT = 3.5V 4 20 mA REFERENCE SECTION Vref Reference Output Voltage –25 °C< TJ <85°C 4.97 5.1 5.23 V Tj =25 °CIref = 0 5.01 5.1 5.19 V ∆Vref Load Regulation 1mA ≤ Iref ≤ 10mA –25 °C< TJ <85°C 315 mV ∆Vref Line Regulation 12V ≤ VCC ≤ 19V –25 °C< TJ <85°C 310 mV Iref sc Short Circuit Current Vref = 0V 203050 mA OSCILLATOR SECTION fosc Initial Accuracy Tj =25 °C 85 100 115 KHz Frequency Stability 12V ≤ VCC ≤ 19V –25 °C< TJ <85°C 80 100 120 KHz Vsvp Ramp Valley to Peak 4.7 5 5.3 V I18C Charge Current VCOSC = 3.5V 0.45 0.55 0.65 mA I18D Discharge Current VCOSC = 3.5V 11.5 mA V18 Ramp Valley Voltage 0.9 1.15 1.4 V SYNC SECTION (Only for L4981A) tW Output Pulse Width 50% Amplitude 0.3 0.8 µs I16 Sink Current with Low Output Voltage VSYNC = 0.4V VCOSC =0V 0.4 0.8 mA -I16 Source Current with High Output Voltage VSYNC = 4.5V VCOSC = 6.7V 16 mA V16L Low Input Voltage 0.9 V V16H High Input Voltage 3.5 V td Pulse for Synchronization 800 ns FREQUENCY MODULATION FUNCTION (Only for L4981B) f18max Maximum Oscillation Frequency VFREQ-MOD = 0V (Pin 16) Ifreq = 0 85 100 115 KHz f18min Minimum Oscillator Frequency IFREQ-MOD = 360 µA (Pin 16) VVRMS = 4V (Pin 7) 74 KHz IFREQ-MOD = 180 µA (Pin 16) VVRMS = 2V (Pin 7) 76 KHz SOFT START SECTION ISS Soft Start Source Current VSS = 3V 60 100 140 µA V12sat Output Saturation Voltage V3 = 6V, ISS = 2mA 0.1 0.25 V L4981A - L4981B 4/17 |
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