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MAX8540-MAX8541 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX8540-MAX8541 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 16 page Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VVCC = 12V, CREF = 1µF, VUV = VOV = VOPTO, VILIM = 2V, RFREQ/SYNC = 32.4k Ω, CSS = 0.1µF, RMAXDTY = 97.6kΩ, VEN = 0, RSCOMP = 68k Ω, RPRAMP = 25kΩ, CSKTON = 0.01µF, CSKTOFF = 0.1µF, VCS = 0.6V, CDRV = 10pF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN TYP MAX UNITS ILIM Leakage Current -1 +1 µA Hiccup Skip Off-Time CSKTOFF = 0.1µF (Note 3) 90 ms Hiccup Skip Off-Charging 0.9 1.5 2.1 µA Hiccup Skip On-Time CSKTON = 0.01µF (Note 3) 9 ms Hiccup Skip On-Charging Current 1.5 2.5 3.5 µA Hiccup SKTOFF Voltage Threshold 2.3 2.5 2.7 V OPTO Input Bias Current VOPTO = 3.5V 30 µA Minimum Input Voltage Minimum voltage for duty-cycle control 0.6 V Maximum Input Voltage Maximum voltage for duty-cycle control 2.6 V DUTY CYCLE RMAXDTY = 24.3k Ω, VUV = 1.3V 15 RMAXDTY = 130k Ω, VUV = 1.3V 80 VUV = 1.3V, RMAXDTY = 97.6k Ω 60 Maximum Duty Cycle Internally programmed limit for maximum duty cycle at all frequencies 79 80 82 % SOFT-START Source Current VSS = 1V 4.5 5.5 6.5 µA Pulldown Resistance in Shutdown ISS = 10mA, V EN = 3V 10 30 Ω Time 440 ms/µF FREQUENCY Initial Accuracy RFREQ = 32.4k Ω 280 300 320 kHz RFREQ = 48.7k Ω 200 Switching Frequency Range RFREQ = 8.87k Ω 1000 kHz SCOMP (MAX8540) RSCOMP = 14k Ω 1.5 Slope Compensation RSCOMP = 204k Ω 0.1 V PRAMP (MAX8541) RPRAMP = 12.4k Ω 2.5 RPRAMP = 21k Ω 1 Ramp Voltage Amplitude RPRAMP = 42k Ω 0.5 V DRV (MOSFET DRIVER) CDRV = 500pF, 10% to 90% of VVCC 30 Rise Time CDRV = 2000pF, 10% to 90% of VVCC 57 ns |
Similar Part No. - MAX8540-MAX8541 |
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Similar Description - MAX8540-MAX8541 |
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