Datasheet LT8310 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 100VIN Forward Converter Controller |
| Pages / Page | 36 / 4 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| File Format / Size | PDF / 430 Kb |
| Document Language | English |
e lecTrical characTerisTics The. denotes the specifications which apply over the full operating
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LT8310
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 24V, UVLO = 24V, OVLO = 0V, SYNC = 0V, SENSE = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Mode Threshold Voltage FBX > 0V 0.2 0.3 0.4 V (Below = Duty Mode/Above = Current Mode) FBX < 0V –0.3 –0.2 –0.13 V Feedback Mode Threshold Hysteresis FBX > 0V 20 mV FBX < 0V 20 mV FBX Pin Input Current FBX = 1.6V 70 100 nA FBX = –0.8V –100 0 100 nA Transconductance (ΔIVC/ΔVFBX) 250 µA/V VC Source Current VFBX = 0V, VVC = 1.3V –14 µA VC Sink Current VFBX = 1.7V, VVC = 1.3V 13 µA VFBX = –0.85V, VVC = 1.3V 11 µA VC Pin Output Impedance 3.3 MΩ VC Pin Current Mode Gain 5 V/V
Gate Driver
GATE Rise Time CGATE = 3.3nF 30 ns GATE Fall Time CGATE = 3.3nF 27 ns GATE Low Voltage 0.05 V GATE High Voltage INTVCC V – 0.05
Current Sense
SENSE Pin Maximum Current Threshold l 115 125 135 mV SENSE Pin Input Current –200 µA
Oscillator
Switching Frequency RT = 100k to GND, VSS ≥ 2.9V l 95 100 105 kHz RT = 33.2k to GND, VSS ≥ 2.9V l 285 300 315 kHz RT = 20k to GND, VSS ≥ 2.9V l 475 500 525 kHz Switching Frequency Line Regulation VIN = 6V to 100V 0.01 % RT Pin Voltage VSS = 3V 0.8 1.0 1.3 V Frequency Foldback VSS = 1.15V 0.15 0.20 0.25 Hz/Hz Foldback = (fOSC at VSS = 1.15V)/fOSC(NOM) SYNC Pin Input High Threshold Voltage l 2.00 V SYNC Pin Input Low Threshold Voltage l 1.00 V SYNC Pin Input Resistance SYNC = 2V 200 kΩ SYNC Frequency Operating Range RT = 33.2k l 260 400 kHz Minimum SYNC High Setup Time fSW = 400kHz l 250 ns Minimum SYNC Low Hold Time fSW = 400kHz l 250 ns
SOUT Driver
SOUT Rise Time CSOUT = 1nF 20 ns SOUT Fall Time CSOUT = 1nF 25 ns SOUT Low Voltage 0.05 V SOUT High Voltage INTVCC V – 0.05 8310f 4 For more information www.linear.com/LT8310 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 24V, UVLO = 24V, OVLO = 0V, SYNC = 0V, SENSE = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Mode Threshold Voltage FBX > 0V 0.2 0.3 0.4 V (Below = Duty Mode/Above = Current Mode) FBX < 0V –0.3 –0.2 –0.13 V Feedback Mode Threshold Hysteresis FBX > 0V 20 mV FBX < 0V 20 mV FBX Pin Input Current FBX = 1.6V 70 100 nA FBX = –0.8V –100 0 100 nA Transconductance (ΔIVC/ΔVFBX) 250 µA/V VC Source Current VFBX = 0V, VVC = 1.3V –14 µA VC Sink Current VFBX = 1.7V, VVC = 1.3V 13 µA VFBX = –0.85V, VVC = 1.3V 11 µA VC Pin Output Impedance 3.3 MΩ VC Pin Current Mode Gain 5 V/V
Gate Driver
GATE Rise Time CGATE = 3.3nF 30 ns GATE Fall Time CGATE = 3.3nF 27 ns GATE Low Voltage 0.05 V GATE High Voltage INTVCC V – 0.05
Current Sense
SENSE Pin Maximum Current Threshold l 115 125 135 mV SENSE Pin Input Current –200 µA
Oscillator
Switching Frequency RT = 100k to GND, VSS ≥ 2.9V l 95 100 105 kHz RT = 33.2k to GND, VSS ≥ 2.9V l 285 300 315 kHz RT = 20k to GND, VSS ≥ 2.9V l 475 500 525 kHz Switching Frequency Line Regulation VIN = 6V to 100V 0.01 % RT Pin Voltage VSS = 3V 0.8 1.0 1.3 V Frequency Foldback VSS = 1.15V 0.15 0.20 0.25 Hz/Hz Foldback = (fOSC at VSS = 1.15V)/fOSC(NOM) SYNC Pin Input High Threshold Voltage l 2.00 V SYNC Pin Input Low Threshold Voltage l 1.00 V SYNC Pin Input Resistance SYNC = 2V 200 kΩ SYNC Frequency Operating Range RT = 33.2k l 260 400 kHz Minimum SYNC High Setup Time fSW = 400kHz l 250 ns Minimum SYNC Low Hold Time fSW = 400kHz l 250 ns
SOUT Driver
SOUT Rise Time CSOUT = 1nF 20 ns SOUT Fall Time CSOUT = 1nF 25 ns SOUT Low Voltage 0.05 V SOUT High Voltage INTVCC V – 0.05 8310f 4 For more information www.linear.com/LT8310 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
