Datasheet LT8391 (Linear Technology) - 3
| 制造商 | Linear Technology |
| 描述 | 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum |
| 页数 / 页 | 34 / 3 — The. denotes the specifications which apply over the full operating |
| 修订版 | A |
| 文件格式/大小 | PDF / 466 Kb |
| 文件语言 | 英语 |
The. denotes the specifications which apply over the full operating
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LT8391 ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range l 4 60 V VIN Quiescent Current VEN/UVLO = 0.3V 1 2 µA VEN/UVLO = 1.1V 270 µA Not Switching 2.1 2.8 mA VOUT Voltage Range l 0 60 V VOUT Quiescent Current VEN/UVLO = 0.3V, VOUT = 12V 0.1 0.5 µA VEN/UVLO = 1.1V, VOUT = 12V 0.1 0.5 µA Not Switching, VOUT = 12V 20 40 60 µA
Linear Regulators
INTVCC Regulation Voltage IINTVCC = 20mA 4.85 5.0 5.15 V INTVCC Load Regulation IINTVCC = 0mA to 80mA 1 4 % INTVCC Line Regulation IINTVCC = 20mA, VIN = 6V to 60V 1 4 % INTVCC Current Limit VINTVCC = 4.5V 80 110 160 mA INTVCC Dropout Voltage (VIN – INTVCC) IINTVCC = 20mA, VIN = 4V 160 mV INTVCC Undervoltage Lockout Threshold Falling 3.44 3.54 3.64 V INTVCC Undervoltage Lockout Hysteresis 0.24 V VREF Regulation Voltage IVREF = 100µA l 1.97 2.00 2.03 V VREF Load Regulation IVREF = 0mA to 1mA 0.4 1 % VREF Line Regulation IVREF = 100µA, VIN = 4V to 60V 0.1 0.2 % VREF Current Limit VREF = 1.8V 2 2.5 3.2 mA VREF Undervoltage Lockout Threshold Falling 1.78 1.84 1.90 V VREF Undervoltage Lockout Hysteresis 50 mV
Control Inputs/Outputs
EN/UVLO Shutdown Threshold l 0.3 0.6 1.0 V EN/UVLO Enable Threshold Falling l 1.190 1.214 1.238 V EN/UVLO Enable Hysteresis 13 mV EN/UVLO Hysteresis Current VEN/UVLO = 0.3V –0.1 0 0.1 µA VEN/UVLO = 1.1V 2.2 2.5 2.8 µA VEN/UVLO = 1.3V –0.1 0 0.1 µA CTRL1, CTRL2 Input Bias Current VCTRL1/2 = 0.75V (Note 4), Current out of 0 20 50 nA Pin CTRL1, CTRL2 Dim-Off Threshold Falling l 190 200 210 mV CTRL1, CTRL2 Dim-Off Hysteresis 28 mV
PWM Dimming
External PWM Dimming Threshold Rising, RP = 30k l 1.3 1.4 1.5 V External PWM Dimming Hysteresis RP = 30k 220 mV Internal PWM Dimming Duty Cycle VPWM = 1V, RP ≥ 51k 3 % VPWM = 1.5V, RP ≥ 51k 47 53 % VPWM = 2V, RP ≥ 51k 97 % Switching Frequency to Internal PWM Dimming RP = 51k 256 Frequency Ratio RP = 82k 512 RP = 130k 1024 RP = 200k 2048 RP = 300k 4096 8391fa For more information www.linear.com/LT8391 3
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range l 4 60 V VIN Quiescent Current VEN/UVLO = 0.3V 1 2 µA VEN/UVLO = 1.1V 270 µA Not Switching 2.1 2.8 mA VOUT Voltage Range l 0 60 V VOUT Quiescent Current VEN/UVLO = 0.3V, VOUT = 12V 0.1 0.5 µA VEN/UVLO = 1.1V, VOUT = 12V 0.1 0.5 µA Not Switching, VOUT = 12V 20 40 60 µA
Linear Regulators
INTVCC Regulation Voltage IINTVCC = 20mA 4.85 5.0 5.15 V INTVCC Load Regulation IINTVCC = 0mA to 80mA 1 4 % INTVCC Line Regulation IINTVCC = 20mA, VIN = 6V to 60V 1 4 % INTVCC Current Limit VINTVCC = 4.5V 80 110 160 mA INTVCC Dropout Voltage (VIN – INTVCC) IINTVCC = 20mA, VIN = 4V 160 mV INTVCC Undervoltage Lockout Threshold Falling 3.44 3.54 3.64 V INTVCC Undervoltage Lockout Hysteresis 0.24 V VREF Regulation Voltage IVREF = 100µA l 1.97 2.00 2.03 V VREF Load Regulation IVREF = 0mA to 1mA 0.4 1 % VREF Line Regulation IVREF = 100µA, VIN = 4V to 60V 0.1 0.2 % VREF Current Limit VREF = 1.8V 2 2.5 3.2 mA VREF Undervoltage Lockout Threshold Falling 1.78 1.84 1.90 V VREF Undervoltage Lockout Hysteresis 50 mV
Control Inputs/Outputs
EN/UVLO Shutdown Threshold l 0.3 0.6 1.0 V EN/UVLO Enable Threshold Falling l 1.190 1.214 1.238 V EN/UVLO Enable Hysteresis 13 mV EN/UVLO Hysteresis Current VEN/UVLO = 0.3V –0.1 0 0.1 µA VEN/UVLO = 1.1V 2.2 2.5 2.8 µA VEN/UVLO = 1.3V –0.1 0 0.1 µA CTRL1, CTRL2 Input Bias Current VCTRL1/2 = 0.75V (Note 4), Current out of 0 20 50 nA Pin CTRL1, CTRL2 Dim-Off Threshold Falling l 190 200 210 mV CTRL1, CTRL2 Dim-Off Hysteresis 28 mV
PWM Dimming
External PWM Dimming Threshold Rising, RP = 30k l 1.3 1.4 1.5 V External PWM Dimming Hysteresis RP = 30k 220 mV Internal PWM Dimming Duty Cycle VPWM = 1V, RP ≥ 51k 3 % VPWM = 1.5V, RP ≥ 51k 47 53 % VPWM = 2V, RP ≥ 51k 97 % Switching Frequency to Internal PWM Dimming RP = 51k 256 Frequency Ratio RP = 82k 512 RP = 130k 1024 RP = 200k 2048 RP = 300k 4096 8391fa For more information www.linear.com/LT8391 3