Datasheet LTC3806 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Synchronous Flyback DC/DC Controller |
| 页数 / 页 | 20 / 3 — ELECTRICAL CHARACTERISTICS The. denotes specifications which apply over … |
| 文件格式/大小 | PDF / 219 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS The. denotes specifications which apply over the full operating
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LTC3806
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 10V, VRUN = 1.5V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX) Maximum Current Sense Input Threshold 110 150 190 mV ISENSE(ON) SENSE Pin Current (G1 High) VSENSE = 0V 35 50 μA ISENSE(OFF) SENSE Pin Current (G1 Low) VSENSE = 1V 0.1 5 μA ISS SS Pin Source Current VSS = 1.5V 3 5 8 μA
Oscillator
fOSC Oscillator Frequency 210 250 290 kHz DC(MAX) Maximum Duty Cycle 84 89 94 %
Regulator
VINTVCC INTVCC Regulator Output Voltage VIN = 10V 6 6.9 7.8 V ΔINTVCC INTVCC Regulator Line Regulation 10V ≤ VIN ≤ 20V 100 mV ΔVIN VLDO(LOAD) INTVCC Load Regulation 0 ≤ IINTVCC ≤ 20mA –6 –3 % V + UVL Rising VIN Threshold Voltage 14 15 16 V V – UVL Falling VIN Threshold Voltage 7.5 8 8.5 V
Gate Drivers
tr1 Gate Driver 1 Output Rise Time CL1 = 3300pF 25 100 ns tf1 Gate Driver 1 Output Fall Time CL1 = 3300pF 18 100 ns tr2 Gate Driver 2 Output Rise Time CL2 = 4700pF 25 100 ns tf2 Gate Driver 2 Output Fall Time CL2 = 4700pF 18 100 ns tDEAD Gate Driver Dead Time CL1 = 3300pF, CL2 = 4700pF 100 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The minimum operating voltage is allowed once operation begins. may cause permanent damage to the device. Exposure to any Absolute To begin operation, VIN must be above the rising undervoltage lockout Maximum Rating condition for extended periods may affect device threshold with VRUN above the rising RUN input threshold. reliability and lifetime.
Note 5:
The dynamic input supply current is higher due to power MOSFET
Note 2:
The LTC3806E is guaranteed to meet performance specifications gate charging (QG • fOSC). See Applications Information. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
Note 6:
The LTC3806 is tested in a feedback loop which servos VFB to the temperature range are assured by design, characterization and correlation reference voltage with the ITH pin forced to a voltage between 0V and 1.4V with statistical process controls. (the no load to full load operating voltage range for the ITH pin is 0.3V to
Note 3:
TJ is calculated from the ambient temperature TA and power 1.23V). dissipation PD according to the following formula: TJ = TA + (PD • 34°C/W) 3806fb 3
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 10V, VRUN = 1.5V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX) Maximum Current Sense Input Threshold 110 150 190 mV ISENSE(ON) SENSE Pin Current (G1 High) VSENSE = 0V 35 50 μA ISENSE(OFF) SENSE Pin Current (G1 Low) VSENSE = 1V 0.1 5 μA ISS SS Pin Source Current VSS = 1.5V 3 5 8 μA
Oscillator
fOSC Oscillator Frequency 210 250 290 kHz DC(MAX) Maximum Duty Cycle 84 89 94 %
Regulator
VINTVCC INTVCC Regulator Output Voltage VIN = 10V 6 6.9 7.8 V ΔINTVCC INTVCC Regulator Line Regulation 10V ≤ VIN ≤ 20V 100 mV ΔVIN VLDO(LOAD) INTVCC Load Regulation 0 ≤ IINTVCC ≤ 20mA –6 –3 % V + UVL Rising VIN Threshold Voltage 14 15 16 V V – UVL Falling VIN Threshold Voltage 7.5 8 8.5 V
Gate Drivers
tr1 Gate Driver 1 Output Rise Time CL1 = 3300pF 25 100 ns tf1 Gate Driver 1 Output Fall Time CL1 = 3300pF 18 100 ns tr2 Gate Driver 2 Output Rise Time CL2 = 4700pF 25 100 ns tf2 Gate Driver 2 Output Fall Time CL2 = 4700pF 18 100 ns tDEAD Gate Driver Dead Time CL1 = 3300pF, CL2 = 4700pF 100 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The minimum operating voltage is allowed once operation begins. may cause permanent damage to the device. Exposure to any Absolute To begin operation, VIN must be above the rising undervoltage lockout Maximum Rating condition for extended periods may affect device threshold with VRUN above the rising RUN input threshold. reliability and lifetime.
Note 5:
The dynamic input supply current is higher due to power MOSFET
Note 2:
The LTC3806E is guaranteed to meet performance specifications gate charging (QG • fOSC). See Applications Information. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
Note 6:
The LTC3806 is tested in a feedback loop which servos VFB to the temperature range are assured by design, characterization and correlation reference voltage with the ITH pin forced to a voltage between 0V and 1.4V with statistical process controls. (the no load to full load operating voltage range for the ITH pin is 0.3V to
Note 3:
TJ is calculated from the ambient temperature TA and power 1.23V). dissipation PD according to the following formula: TJ = TA + (PD • 34°C/W) 3806fb 3