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TC105303ECT Datasheet(PDF) 6 Page - Microchip Technology |
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TC105303ECT Datasheet(HTML) 6 Page - Microchip Technology |
6 / 14 page TC105 DS21349C-page 6 2001-2012 Microchip Technology Inc. 4.0 APPLICATIONS 4.1 Circuit Examples Figure 4-3 shows a TC105 using a PNP switching transistor (Zetex FZT749) that has an hFE of 180 and VCESAT of 100 mV at IC = 1A. Other high beta transis- tors can be used, but the values of RB and CB may need adjustment if hFE is significantly different from that of the FZT749. The circuit of Figure 4-4 utilizes a P-channel MOSFET switching transistor (Silconix Si9430). This transistor is a member of the Littlefoot™ family of small outline MOSFETs. FIGURE 4-1: SOFT START CIRCUIT FIGURE 4-2: EXTERNAL TRANSISTOR CONNECTION TC105 4 SHDN SHDN/SS TC105 4 VIN CSS 0.033 µF SHDN/SS Shutdown Not Used RSS 470K Shutdown Used ON OFF (From System Control Logic) + + – – RSS 470K CSS 0.033 µF TC105 1 VIN VOUT Q L D CL EXT CB RB TC105 1 VIN VOUT P L D EXT CL P-Channel MOSFET PNP Bipolar Transistor – + – + – + |
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