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MAX5021 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX5021 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 11 page Current-Mode PWM Controllers for Isolated Power Supplies _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN = +12V, TA = +25°C, unless otherwise noted.) (Note 1) Note 1: All devices are 100% tested at TA = +25°C. All limits over temperature are guaranteed by characterization. Note 2: This minimum current after startup is a safeguard that prevents the VIN pin voltage from rising in the event that OPTO and NDRV become unconnected. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OSCILLATOR Switching Frequency fSW 230 262 290 kHz MAX5021 50 51 Maximum Duty Cycle DMAX MAX5022 75 76 % OPTO INPUT OPTO Pullup Voltage VOPTO OPTO sourcing 10µA 5.5 V OPTO Pullup Resistance ROPTO 4.5 6.2 7.9 k Ω Typical Operating Characteristics (VIN = 15V, TA = +25°C, unless otherwise noted.) 23.9 24.0 24.1 24.2 24.3 UNDERVOLTAGE LOCKOUT vs. TEMPERATURE TEMPERATURE ( °C) -40 20 40 -20 0 60 80 VIN RISING 9.8 9.9 10.0 10.1 10.2 UNDERVOLTAGE LOCKOUT vs. TEMPERATURE TEMPERATURE ( °C) -40 20 40 -20 0 60 80 VIN FALLING 47 48 49 50 51 52 53 -40 -20 0 20 40 60 80 STARTUP CURRENT vs. TEMPERATURE TEMPERATURE ( °C) VIN = 23.0V |
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