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DMW48S3.3-3000 Datasheet(PDF) 5 Page - Wall Industries,Inc. |
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DMW48S3.3-3000 Datasheet(HTML) 5 Page - Wall Industries,Inc. |
5 / 6 page Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833 02/24/2010 603-778-2300 www.wallindustries.com Fax 603-778-9797 Page 5 of 6 DMW Ultra Wide Series Single and Dual Output 4:1 Ultra Wide Input Voltage Range Up to 15.3 Watts DC/DC Converters Rev C + DC Power Source - +Vin +Out DC / DC Converter -Vin -Out + Load Cin DESIGN & FEATURE CONSIDERATIONS Remote On/Off Positive logic remote on/off turns the module on during a logic high voltage on the remote on/off pin, and off during a logic low. To turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the -Vin terminal. The switch can be an open collector or equivalent. A logic low is -0.7V to 0.8V. A logic high is 2.5V to 5.5V. The maximum sink current at on/off terminal during a logic low is -1mA. The maximum allowable leakage current of the switch at on/off terminal (2.5 to 5.5V) is 50µA. Over Current Protection To provide protection in a fault (output overload) condition, the unit is equipped with internal current limiting circuitry and can endure current limiting for an unlimited duration. At the point of current-limit inception, the unit shifts from voltage control to current control. The unit operates normally once the output current is brought back into its specified range. Input Source Impedance The power module should be connected to a low ac-impedance input source. Highly inductive source impedances can affect the stability of the power module. In applications where power is supplied over long lines and output loading is high, it may be necessary to use a capacitor at the input to ensure startup. A capacitor mounted close to the power module helps ensure stability of the unit, it is recommended to use a good quality low Equivalent Series Resistance (ESR < 1.0Ω at 100KHz) capacitor of a 6.8µF for the 24V and 48V input devices. Maximum Capacitive Load The DMW series has a limitation of maximum connected capacitance at the output. The power module may be operated in current limiting mode during start-up, affecting the ramp-up and the startup time. For optimum performance we recommend 220µF maximum capacitive load for dual outputs and 470µF capacitive load for single outputs. The maximum capacitance can be found in the Model Selection Guide. TEST CONFIGURATIONS Input Reflected-Ripple Current Test Setup Input reflected-ripple current is measured with an inductor Lin (4.7µH) and Cin (220µF, ESR < 1.0Ω at 100KHz) to simulate source impedance. Capacitor Cin offsets possible battery impedance. Current ripple is measured at the input terminals of the module. Measurement bandwidth is 0-500 KHz. Peak-to-Peak Output Noise Measurement Test Use a Cout 0.47µF ceramic capacitor. Scope measurement should be made by using a BNC socket; measurement bandwidth is 0-20 MHz. Position the load between 50 mm and 75 mm from the DC/DC converter. To Oscilloscope + + Lin Battery Cin +Vin +Out DC / DC Converter -Vin -Out Current Probe Load Scope +Vin +Out Dual Output DC / DC Com. Converter -Vin -Out Copper Strip Scope Cout Cout Resistive Load Copper Strip Copper Strip +Vin +Out Single Output DC / DC Converter -Vin -Out Copper Strip Cout Copper Strip Scope Resistive Load |
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