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A4405 Fiches technique(PDF) 14 Page - Allegro MicroSystems |
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A4405 Fiches technique(HTML) 14 Page - Allegro MicroSystems |
14 / 27 page Constant On-Time Buck Regulator With One External and Two Internal Linear Regulators A4405 14 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com V5 Regulator The 5 V linear regulator is provided to supply local circuitry. This regulator can deliver 300 mA (typ), 215 mA (min). When a direct short is applied to this regulator the output the current folds back to 0 V at approximately 100 mA (typ) (figure 4). V5P Tracking Regulator The 5VP linear tracking regulator is provided to supply remote circuitry such as off-board sensors. The V5P pin is monitored and if a short to ground or a short to battery occurs the V5P output is disabled and/or disconnected and the other outputs (VREG, V5, and V33) remain active until the short is removed. The regulator can deliver 375 mA (typ), 270 mA (min). When a direct short is applied to this regulator the output the current folds back to 0 V at approximately 112 mA (typ) (figure 5). The V5P regulator is designed to track the V33 output during power-up and when the device is completing a soft start ramp. The V5P regulator tracks the 3.3 V output to within ±0.5% under normal steady state operating conditions. If the V33 regulator is decreasing, the V5P regulator accurately tracks the V33 output down to the point at which a V33 undervoltage fault (2.825 V nominally: 2.95 V – 125 mV) results in the NPOR output going active. The figures 6 and 7 show A4405 operation when the V5P pin is shorted to ground and VIN (battery). In both cases, the V5P output is disabled and/or disconnected while the other outputs (VREG, V5, and V33) remain active. Figure 6. V5P is shorted to ground in 5 μs (DV5P is populated); shows VVREG (ch1, 2 V/div.), VV33 (ch2, 1 V/div.), VV5 (ch3, 2 V/div.), VV5P (ch4, 2 V /div.), t = 10 μs/div. t VV33 VV5 VV5P VVREG C1 C3 C4 C2 Figure 7. V5P is shorted to a 25 V battery; shows VVREG (ch1, 2 V/div.), VV33 (ch2, 2 V/div.), VIN pin (ch3, 5 V/div.), VV5P (ch4, 5 V/div.), t = 10 μs/div. 6 5 4 3 2 1 0 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 Output Current (mA) Typical Maximum 6 5 4 3 2 1 0 50 100 150 200 250 300 350 Output Current (mA) 400 450 500 Typical Maximum Figure 4. Foldback current limit of the 5V regulator Figure 5. Foldback current limit of the 5VP regulator t VV33 VREG VV5P 5 V 25 V 30 V VIN pin Ringing due to parasitics from a long wire V5P is clamped to a safe level above VIN by D2 (see application schematic) All |
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