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MAX5019 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX5019 Datasheet(HTML) 3 Page - Maxim Integrated Products |
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Current-Mode PWM Controllers with Integrated Startup Circuit _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VDD = 13V, a 10µF capacitor connects VCC to GND, VCS = 0, V+ = 48V, 0.1µF capacitor connected from SS_SHDN to GND, NDRV = open circuit, VFB = 3V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SLOPE COMPENSATION Slope Compensation (MAX5019 only) VSCOMP 26 mV/ µs THERMAL SHUTDOWN Thermal Shutdown Temperature 150 °C Thermal Hysteresis 25 °C CURRENT LIMIT CS Threshold Voltage VILIM FB = GND 419 465 510 mV CS Input Bias Current 0 ≤ VCS ≤ 2V, FB = GND -1 1 µA Current Limit Comparator Propagation Delay 50mV overdrive on CS, FB = GND 180 ns CS Blanking Time FB = GND, only PWM comparator is blanked 70 ns OSCILLATOR Clock Frequency Range FB = GND 247 275 302 kHz MAX5019, FB = GND 75 85 Max Duty Cycle MAX5020, FB = GND 44 50 % SOFT-START SS Source Current ISSO VSS_SHDN = 0 2.0 4.5 6.5 µA SS Sink Current 1.0 mA Steady State Reference Voltage at SS_ SHDN VSS_SHDN No external load 2.331 2.420 2.500 V VSS_SHDN falling 0.25 0.37 0.41 Shutdown Threshold VSS_SHDN rising 0.53 0.59 0.65 V Typical Operating Characteristics (V+ = 48V, VDD = 13V, CS = GND, NRDV is open circuit, TA = +25°C, unless otherwise noted.) 0.999 1.000 1.001 1.002 1.003 -40 0 -20 20 40 60 80 VSS_SHDN vs. TEMPERATURE (AT THE END OF SOFT-START) TEMPERATURE ( °C) VFB = 4V 273 274 276 275 277 278 -40 0 -20 20 40 60 80 NDRV FREQUENCY vs. TEMPERATURE TEMPERATURE ( °C) FB = GND 80.4 80.6 80.5 80.8 80.7 80.9 81.0 -40 20 40 -20 0 60 80 MAX5019 MAXIMUM DUTY CYCLE vs. TEMPERATURE TEMPERATURE ( °C) FB = GND |
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