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MC34063A Datasheet(PDF) 6 Page - Texas Instruments |
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MC34063A Datasheet(HTML) 6 Page - Texas Instruments |
6 / 16 page www.ti.com 8 7 6 1 2 R* * R " 0 for constant Vin 8 7 6 1 2 Vout RSC Vin RSC Vin Vout a) EXTERNAL npn SWITCH b) EXTERNAL pnp SATURATED SWITCH (see Note A) MC33063A, MC34063A 1.5-A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS SLLS636J – DECEMBER 2004 – REVISED OCTOBER 2005 A. If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents ( ≤300 mA) and high driver currents ( ≥30 mA), it may take up to 2 µs to come out of saturation. This condition will shorten the off time at frequencies ≥30 kHz and is magnified at high temperatures. This condition does not occur with a Darlington configuration because the output switch cannot saturate. If a non-Darlington configuration is used, the output drive configuration in Figure 7b is recommended. Figure 7. External Current-Boost Connections for IC Peak Greater Than 1.5 A 6 |
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