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LT1070HVMK Datasheet(PDF) 3 Page - Linear Technology |
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LT1070HVMK Datasheet(HTML) 3 Page - Linear Technology |
3 / 12 page 3 LT1070/LT1071 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VFB Flyback Reference Voltage IFB = 50µA 15 16.3 17.6 V q 14 18.0 V Change in Flyback Reference Voltage 0.05 ≤ IFB ≤ 1mA 4.5 6.8 8.5 V Flyback Reference Voltage Line Regulation IFB = 50µA, 3V ≤ VIN ≤ VMAX (Note 3) 0.01 0.03 %/V Flyback Amplifier Transconductance (gm) ∆IC = ±10µA 150 300 650 µmho Flyback Amplifier Source and Sink Current VC = 0.6V, IFB = 50µA (Source) q 15 32 70 µA VC = 0.6V, IFB = 50µA (Sink) q 25 40 70 µA BV Output Switch Breakdown Voltage 3V ≤ VIN ≤ VMAX, ISW = 1.5mA (LT1070/LT1071) q 65 90 V (LT1070HV/LT1071HV) q 75 90 V VSAT Output Switch “On” Resistance (Note 4) LT1070 q 0.15 0.24 Ω LT1071 q 0.30 0.50 Ω Control Voltage to Switch Current LT1070 8 A/V Transconductance LT1071 4 A/V ILIM Switch Current Limit (LT1070) Duty Cycle ≤ 50%, TJ ≥ 25°C q 510 A Duty Cycle ≤ 50%, TJ < 25°C q 511 A Duty Cycle = 80% (Note 5) q 410 A Switch Current Limit (LT1071) Duty Cycle ≤ 50%, TJ ≥ 25°C q 2.5 5.0 A Duty Cycle ≤ 50%, TJ < 25°C q 2.5 5.5 A Duty Cycle = 80% (Note 5) q 2.0 5.0 A ∆IIN Supply Current Increase During 25 35 mA/A ∆ISW Switch “On” Time f Switching Frequency 35 40 45 kHz q 33 47 kHz DC (Max) Maximum Switch Duty Cycle 90 92 97 % Flyback Sense Delay Time 1.5 µs Shutdown Mode Supply Current 3V ≤ VIN ≤ VMAX, VC = 0.05V 100 250 µA Shutdown Mode Threshold Voltage 3V ≤ VIN ≤ VMAX 100 150 250 mV q 50 300 mV VIN = 15V, VC = 0.5V, VFB = VREF, output pin open unless otherwise specified. The q denotes the specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Minimum switch “on” time for the LT1070/LT1071 in current limit is ≈1µs. This limits the maximum input voltage during short-circuit conditions, in the buck and inverting modes only, to ≈35V.Normal(unshorted)conditions are not affected. Mask changes are being implemented which will reduce minimum “on” time to ≤1µs, increasing maximum short-circuit input voltage above 40V. If the present LT1070/LT1071 (contact factory for package date code) is being operated in the buck or inverting mode at high input voltages and short-circuit conditions are expected, a resistor must be placed in series with the inductor, as follows: The value of the resistor is given by: R = – RL t • f • VIN – VF ILIMIT t = Minimum “on” time of LT1070/LT1071 in current limit, ≈1µs f = Operating frequency (40kHz) VF = Forward voltage of external catch diode at ILIMIT ILIMIT = Current limit of LT1070 (≈8A), LT1071 (≈ 4A) RL = Internal series resistance of inductor Note 3: VMAX = 55V for LT1070HV and LT1071HV to avoid switch breakdown. Note 4: Measured with VC in hi clamp, VFB = 0.8V. ISW = 4A for LT1070 and 2A for LT1071. Note 5: For duty cycles (DC) between 50% and 80%, minimum guaranteed switch current is given by ILIM = 3.33 (2 – DC) for the LT1070 and ILIM = 1.67 (2 – DC) for the LT1071. |
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