component
L4981BD
Public Made by Adomby adom
STMicroelectronics AC-DC Controllers & Regulators, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"number": "1",
"name": "P-GND",
"type": "power_in",
"description": "Power ground return for the gate driver and power stage, kept separate from signal ground S-GND (pin 10)."
},
{
"number": "2",
"name": "IPK",
"type": "input",
"description": "Peak current limit input for the L4981B, set by two external resistors between the sense resistor, pin 2 and the reference voltage; pin 2 is limited to -0.3 to 5.5 V (-2 V for 1 µs)."
},
{
"number": "3",
"name": "OVP",
"type": "input",
"description": "Overvoltage protection comparator input, compared against an internal 5.1 V (typ) reference via a divider from the boost output."
},
{
"number": "4",
"name": "IAC",
"type": "input",
"description": "AC current input carrying a current proportional to the rectified mains voltage, rated at 5 mA maximum."
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{
"number": "5",
"name": "CA-OUT",
"type": "output",
"description": "Current amplifier output; an external RC network sets the current loop gain."
},
{
"number": "6",
"name": "LFF",
"type": "input",
"description": "Load feedforward input, best controlled between 1.5 V and 5.3 V; connect to VREF (pin 11) if unused."
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{
"number": "7",
"name": "VRMS",
"type": "input",
"description": "Input for the proportional RMS line voltage, best controlled between 1.5 V and 5.5 V; connect to VREF (pin 11) if unused."
},
{
"number": "8",
"name": "MULT-OUT",
"type": "input",
"description": "Multiplier output shared with the current amplifier input; a high-impedance node that must not be taken below -0.5 V."
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{
"number": "9",
"name": "ISENSE",
"type": "input",
"description": "Current amplifier inverting input that must not be driven below -0.5 V."
},
{
"number": "10",
"name": "S-GND",
"type": "power_in",
"description": "Signal ground reference for the control circuitry, separate from power ground P-GND (pin 1)."
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{
"number": "11",
"name": "VREF",
"type": "power_out",
"description": "Precise ±2% reference output of 5.1 V (typ) that is internally current limited and can deliver up to 10 mA."
},
{
"number": "12",
"name": "SS",
"type": "passive",
"description": "Soft start capacitor pin; an internal 100 µA (typ) source charges the external capacitor, which is discharged during overvoltage and UVLO conditions."
},
{
"number": "13",
"name": "VA-OUT",
"type": "output",
"description": "Error amplifier output for which an RC network sets the voltage loop gain; the absolute maximum is 8.5 V."
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{
"number": "14",
"name": "VFEED",
"type": "input",
"description": "Voltage error amplifier inverting input, fed through a divider from the boost output voltage."
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{
"number": "15",
"name": "P-UVLO",
"type": "input",
"description": "Programmable undervoltage lockout threshold input, set by a divider between VCC and GND (for example 220K to VCC and 33K to GND gives about 12 V turn-on)."
},
{
"number": "16",
"name": "FREQ-MOD",
"type": "bidirectional",
"description": "On the L4981B this is the frequency modulation current input, with a resistor to the rectified line; the L4981A uses it as a CMOS-compatible SYNC input/output, and the absolute maximum is 7 V."
},
{
"number": "17",
"name": "ROSC",
"type": "passive",
"description": "An external resistor to ground sets the constant charging current of COSC; the pin voltage is rated -0.3 to 3 V."
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{
"number": "18",
"name": "COSC",
"type": "passive",
"description": "An external capacitor to GND sets the switching frequency; the input sink current is rated at 15 mA."
},
{
"number": "19",
"name": "VCC",
"type": "power_in",
"description": "Supply input, rated at 19.5 V maximum operating supply voltage with a self-limiting zener (20 to 30 V) and an absolute maximum of 50 mA ICC."
},
{
"number": "20",
"name": "GDRV",
"type": "output",
"description": "Gate driver output using a bipolar and DMOS totem pole stage that can deliver peak current in excess of 1 A to drive a MOSFET or IGBT, with a peak sink of 2 A and a source of 1.5 A."
}
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{
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"conditions": "",
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{
"name": "Input sink current",
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"min": null,
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"max": 15,
"conditions": "pin 18",
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{
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{
"name": "Voltage at pin 2",
"symbol": "VIPK",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
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"max": 5.5,
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{
"name": "Voltage at pin 2 transient",
"symbol": "VIPK",
"kind": "absolute_maximum",
"unit": "V",
"min": -2,
"typ": null,
"max": null,
"conditions": "t = 1µs",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Power dissipation SO20",
"symbol": "Ptot",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 0.6,
"conditions": "Tamb = 70°C",
"source_page": 2,
"source": "datasheet"
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{
"name": "Top operating ambient temperature",
"symbol": "Top",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
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{
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"min": -55,
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{
"name": "Input offset voltage",
"symbol": "VIO",
"kind": "electrical",
"unit": "mV",
"min": -8,
"typ": null,
"max": 8,
"conditions": "-25°C < TJ < 85°C",
"source_page": 4,
"source": "datasheet"
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{
"name": "Input bias current",
"symbol": "IIB",
"kind": "electrical",
"unit": "nA",
"min": -500,
"typ": -50,
"max": 500,
"conditions": "VFEED = 0V",
"source_page": 4,
"source": "datasheet"
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{
"name": "Open loop gain (error amplifier)",
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"min": 70,
"typ": 100,
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{
"name": "Output high voltage",
"symbol": "V13H",
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"min": 5.5,
"typ": 6.5,
"max": 7.5,
"conditions": "VFEED = 4.7V; IVA-OUT = -0.5mA",
"source_page": 4,
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{
"name": "Output low voltage",
"symbol": "V13L",
"kind": "electrical",
"unit": "V",
"min": null,
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"max": 1,
"conditions": "VFEED = 5.5V; IVA-OUT = 0.5mA",
"source_page": 4,
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{
"name": "Output source current",
"symbol": "-I13",
"kind": "electrical",
"unit": "mA",
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"conditions": "VFEED = 4.7V; VVA-OUT = 3.5V",
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"conditions": "VFEED = 5.5V; VVA-OUT = 3.5V",
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{
"name": "Reference output voltage",
"symbol": "Vref",
"kind": "electrical",
"unit": "V",
"min": 4.97,
"typ": 5.1,
"max": 5.23,
"conditions": "-25°C < TJ < 85°C",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Reference output voltage at 25°C",
"symbol": "Vref",
"kind": "electrical",
"unit": "V",
"min": 5.01,
"typ": 5.1,
"max": 5.19,
"conditions": "Tj = 25°C; Iref = 0",
"source_page": 4,
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},
{
"name": "Load regulation",
"symbol": "ΔVref",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 3,
"max": 15,
"conditions": "1mA ≤ Iref ≤ 10mA; -25°C < TJ < 85°C",
"source_page": 4,
"source": "datasheet"
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{
"name": "Line regulation",
"symbol": "ΔVref",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 3,
"max": 10,
"conditions": "12V ≤ VCC ≤ 19V; -25°C < TJ < 85°C",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Short circuit current",
"symbol": "Iref sc",
"kind": "electrical",
"unit": "mA",
"min": 20,
"typ": 30,
"max": 50,
"conditions": "Vref = 0V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Initial accuracy",
"symbol": "fosc",
"kind": "electrical",
"unit": "KHz",
"min": 85,
"typ": 100,
"max": 115,
"conditions": "Tj = 25°C",
"source_page": 4,
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},
{
"name": "Frequency stability",
"symbol": "",
"kind": "electrical",
"unit": "KHz",
"min": 80,
"typ": 100,
"max": 120,
"conditions": "12V ≤ VCC ≤ 19V; -25°C < TJ < 85°C",
"source_page": 4,
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},
{
"name": "Ramp valley to peak",
"symbol": "Vsvp",
"kind": "electrical",
"unit": "V",
"min": 4.7,
"typ": 5,
"max": 5.3,
"conditions": "",
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},
{
"name": "Charge current",
"symbol": "I18C",
"kind": "electrical",
"unit": "mA",
"min": 0.45,
"typ": 0.55,
"max": 0.65,
"conditions": "VCOSC = 3.5V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Discharge current",
"symbol": "I18D",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 11.5,
"max": null,
"conditions": "VCOSC = 3.5V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Ramp valley voltage",
"symbol": "V18",
"kind": "electrical",
"unit": "V",
"min": 0.9,
"typ": 1.15,
"max": 1.4,
"conditions": "",
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{
"name": "Maximum oscillation frequency",
"symbol": "f18max",
"kind": "electrical",
"unit": "KHz",
"min": 85,
"typ": 100,
"max": 115,
"conditions": "VFREQ-MOD = 0V (Pin 16); Ifreq = 0",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Minimum oscillator frequency",
"symbol": "f18min",
"kind": "electrical",
"unit": "KHz",
"min": null,
"typ": 74,
"max": null,
"conditions": "IFREQ-MOD = 360µA (Pin 16); VVRMS = 4V (Pin 7)",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Soft start source current",
"symbol": "ISS",
"kind": "electrical",
"unit": "µA",
"min": 60,
"typ": 100,
"max": 140,
"conditions": "VSS = 3V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Soft start output saturation voltage",
"symbol": "V12sat",
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"unit": "V",
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"max": 0.25,
"conditions": "V3 = 6V; ISS = 2mA",
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"source": "datasheet"
},
{
"name": "Operating supply voltage",
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"typ": 19.5,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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