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XC6377DXX2SL Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC6377DXX2SL Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 17 page XC6376/6377 Series 587 5 6. EXT / 1, EXT / 2 Pins As the EXT / 1 and EXT / 2 pins are provided, external transistor drives and various application circuits can be handled. EXT / 1 follows the same timing pattern as a P-channel power MOSFET ("L" in the ON mode) whereas EXT / 2 functions in a 100 nsec blank clock timing pattern (N.B. EXT / 2 changes from "H to L" 100 nsec before EXT /1 but 100 nsec after EXT / 1 with "L to H" changes.) e.g. The drawing of large output currents can be handled by connecting an external, low ON resistance, P-ch power MOSFET. In such cases we also recommend that the FET gate be connected to EXT / 1, the source to VIN and the drain to Lx in line with the typical application circuit examples provided. The EXT /1 pin can be driven to a gate capacitance of up to 1000pF. 7. U. V. L. O Circuit Below the minimum operating voltage (VUVLO) operations shut down and, along with the P-ch power MOSFET being set to OFF, Ext /1 and EXT /2 will be "H" . (If using an external transistor, the transistor will be set to OFF.) 8. VOUT Reset Function A function that pulls VOUT to ground during stand-by (CE "L") is available (XC6376E). Note that this function is not available with externally set-up output voltage types (FB). 9. Capacitor CIN Sudden current changes at ground or power supply that are common to step-down DC/DC converters during switching may cause the IC's operations to become unstable depending upon the degree to which the IC's power supply voltage changes, which in turn is affected by the wiring's impedance level. It is therefore recommended that a power supply ripple rejection use capacitor (CIN) be connected between the IC's VIN and GND pins. 05S_3XC6376/77 02.09.12 15:20 ページ 587 |
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