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FOD3181TV Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FOD3181TV Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 12 page 11 www.fairchildsemi.com FOD3181 Rev. 1.0.3 IOH and IOL Test Conditions This device is tested and specified when driving a complex reactive load. The load consists of a capacitor in the series with a current limiting resistor. The capacitor represents the gate to source capacitance of a power MOSFET transistor. The test load is a 0.03uF capacitor in series with an 40 Ω resistor. The LED test frequency is 10.0kHz with a 50% duty cycle. The com- bined IOH and IOL output load current duty factor is 0.6% at the test frequency. Figure 14 illustrates the relationship of the LED input drive current and the device’s output voltage and sourcing and sink- ing currents. The 0.03µF capacitor load represents the gate to source capacitance of a very large power MOSFET transistor. A single supply voltage of 20V is used in the evaluation. Figure 15 shows the test schematic to evaluate the output volt- age and sourcing and sinking capability of the device. The IOH and IOL are measured at the peak of their respective current pulses. Figure 14. FOD 3180 Output Current and Output Voltage vs. LED Drive Figure 15. Test Schematic 0 20V IF = 8mA P-Channel (ON) IOH = 0.5A IOL = 0.5A N-Channel (ON) ON OFF LED OUTPUT Load Current 1µs/Div 1 2 3 4 8 IFMON IOMON VO 100 Ω 100 Ω 40 Ω 0.1 µF 22 µF 0.33 µF Pulse Generator 7 6 5 FOD3181 |
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