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LT1640AHIN8 Datasheet(PDF) 8 Page - Linear Technology |
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LT1640AHIN8 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LT1640AL/LT1640AH Capacitor C1 and resistor R3 prevent Q1 from momen- tarily turning on when the power pins first make contact. Without C1 and R3, capacitor C2 would pull the gate of Q1 up to a voltage roughly equal to VEE • C2/CGS(Q1) before the LT1640A could power up and actively pull the gate low. By placing capacitor C1 in parallel with the gate capacitance of Q1 and isolating them from C2 using resistor R3, the problem is solved. The value of C1 should be: VV V CC INMAX TH TH GD − •+ () 2 where VTH is the MOSFET’s minimum gate threshold and VINMAX is the maximum operating input voltage. R3’s value is not critical and is given by (VINMAX + ∆VGATE)/ 5mA. The waveforms are shown in Figure 6b. When the power pins make contact, they bounce several times. While the contacts are bouncing, the LT1640A senses an undervoltage condition and the GATE is immediately pulled low when the power pins are disconnected. Once the power pins stop bouncing, the GATE pin starts to ramp up. When Q1 turns on, the GATE voltage is held constant by the feedback network of R3 and C2. When the DRAIN voltage has finished ramping, the GATE pin then ramps to its final value. Figure 6b. Inrush Control Waveforms 1640A F07b CONTACT BOUNCE APPLICATIO S I FOR ATIO |
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