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LT3837EFE-TRPBF 数据表(PDF) 3 Page - Linear Technology |
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LT3837EFE-TRPBF 数据表(HTML) 3 Page - Linear Technology |
3 / 28 page LT3837 3 3837fa Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = 14V; PG, SG Open; VC = 1.4V, VSENSE = 0, RCMP = 1k, RTON = 90k, RPGDLY = 27.4k, RENDLY = 90k, unless otherwise specified. Note 3: The LT3837E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 40°C/W) Note 5: Supply current does not include gate charge current to the MOSFETs. See Applications Information. Note 6: Component value range guaranteed by design. PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Amplifier Voltage Gain VC = 1V to 2V 1400 V/V Soft-Start Charging Current VSFST = 1.5V 16 20 25 μA Soft-Start Discharge Current VSFST = 1.5V, VUVLO = 0V 0.7 1.3 mA Control Pin Threshold (VC) Duty Cycle = Min 1.0 V Gate Outputs PG, SG Output High Level PG, SG Output Low Level l l 6.6 7.4 0.01 8.0 0.05 V V PG, SG Output Shutdown Strength VUVLO = 0V; IPG, ISG = 20mA l 1.6 2.3 V PG Rise Time CPG = 1nF 11 ns SG Rise Time CSG = 1nF 15 ns PG, SG Fall Time CPG, CSG = 1nF 10 ns Current Amplifier Switch Current Limit at Maximum VC VSENSE + l 88 98 110 mV ΔVSENSE/ΔVC 0.07 V/V Sense Voltage Overcurrent Fault Voltage VSENSE +, VSFST < 1V 206 230 mV Timing Switching Frequency (fOSC)COSC = 100pF l 84 100 110 kHz Oscillator Capacitor Value (COSC) (Note 6) 33 200 pF Minimum Switch On Time (tON(MIN)) 200 ns Flyback Enable Delay Time (tED) 265 ns PG Turn-On Delay Time (tPGDLY) 200 ns Maximum Switch Duty Cycle l 85 88 % SYNC Pin Threshold l 1.53 2.1 V SYNC Pin Input Resistance 40 k Ω Load Compensation Load Comp to VSENSE Offset Voltage VRCMP with VSENSE+ = 0 0.8 mV Feedback Pin Load Compensation Current VSENSE+ = 20mV 20 μA UVLO Function UVLO Pin Threshold (VUVLO) l 1.215 1.240 1.265 V UVLO Pin Bias Current VUVLO = 1.2V VUVLO = 1.3V –0.25 –4.50 0.1 –3.4 0.25 –2.50 μA μA |
类似零件编号 - LT3837EFE-TRPBF |
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类似说明 - LT3837EFE-TRPBF |
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