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FDG901 Scheda tecnica(PDF) 5 Page - Fairchild Semiconductor |
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FDG901 Scheda tecnica(HTML) 5 Page - Fairchild Semiconductor |
5 / 6 page FDG901D rev. D (W) The Slew Rate Control Driver (FDG901D) is designed to give a programmed choice of one of three steady dv/dt states on the output during turn-on. To change the dv/dt value, the user needs to use the Slew Rate Control Pin (Pin 2). To utilize the smallest current setting ( ≈10 nA) from the IC, a voltage equal to Vdd must be applied to the Slew Rate Control Pin 2. To use the next higher current setting ( ≈1 µA) a voltage equal to Ground must be applied to Pin 2. To achieve the highest current setting ( ≈ 80 µA) or obtain a faster switching speed, the Slew Rate Pin2 must be open (floating). A higher value of capacitance will result in a slower switching rate. To determine the switching times of each setting use the simple equation: G g I Q t = where Qg is the Gate charge in nC for a given MOSFET and IG is the gate current controlled by the slew rate pin. Below is a captured image from an oscilloscope depicting the device response. The FDG901D was connected to control an FDG258P P-Channel DMOS. The Slew Rate control pin was set to open (floating state). V IN = 5.5V V DD = 5.5V R LOAD = 1.5Ω Test Conditions: V IN = 5.5V V DD = 5.5V R LOAD = 1.5Ω Test Conditions: V RLoad V gate (inverted) V IN Circuit waveforms for an FDG901D controlling a P-Channel FDG258P MOSFET. V RLoad V gate (inverted) V IN Circuit waveforms for an FDG901D controlling a P-Channel FDG258P MOSFET. |
Codice articolo simile - FDG901 |
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Descrizione simile - FDG901 |
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