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ASM8P18S42F-08-MX Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation |
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ASM8P18S42F-08-MX Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation |
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3 / 11 page  ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER June 2005 ASM8P18S44ER / ASM8P18S45ER rev 0.6 Voltage Mode PWM Controller with EMI Reduction 3 of 11 Notice: The information in this document is subject to change without notice. Application Information Spread Spectrum Deviation The deviation can be determined by selecting the proper resistor at VREF to GND for the parts with ‘ER’ suffix. (Refer “RD Resistor Vs. % Modulation Depth Plot” for resistor selection) PWM Frequency The PWM frequency can be determined by selecting the proper capacitance (CT) at the FSEL pin. Start-up Current ASM8P18xx allows a substantial reduction in the start up current. Low start up current allows high resistance, lower wattage start-up resistor, to supply controller start up power. Under Voltage Lockout (UVLO) When the power supply voltage is below the start up threshold voltage, internal circuitry puts the output into low impedance state and sets the output to zero. Thermal Shutdown The output of ASM8P18xx goes down to zero when the junction temperature of the device rises above 155°C. The device automatically resumes operation when temperature drops to 126°C. This protects the device from thermal breakdown. Overload and under current protection ASM8P18xx provides Cycle by cycle current limit and pulls down PWM output to low as soon as ISNS pin senses a peak voltage of 1V, with a delay to output of 125 nS maximum. At no load condition when the device senses the peak voltage level of less than 0.1V at ISNS pin for a period of 200mS, the oscillator enters in to cycle skip mode. Normal condition is restored once ISNS increases beyond 0.1V for more than three cycles. Details of cycle skip for different options are provided in the Electrical Characteristics table. Absolute Maximum Ratings Symbol Parameter Min Max Units VDD Supply Voltage 30 V IDD Supply Current TBD* mA IOUT Maximum Output Current 1 A ISNS Current Sense Inputs and feedback ISNS, FB, COMP 5 V VREF Reference Voltage 6 V VOSC Oscillator Voltage 4 V VOUT Output Voltage 30 V Operation Junction Temperature -45 150 °C Storage Temperature -65 150 °C Lead Soldering Temperature (10 Seconds) 300 °C Static Discharge Voltage MIL-STD-883 2 KV *Maximum output voltage = 30V |
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Similar Description - ASM8P18S42F-08-MX |
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