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TC1240 Datasheet(PDF) 5 Page - Microchip Technology |
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TC1240 Datasheet(HTML) 5 Page - Microchip Technology |
5 / 11 page 5 TC1240 Positive Doubling Charge Pump with Shutdown in SOT Package TC1240-1 7/7/00 DS21333A © 2001 Microchip Technology Inc. Figure 5. Paralleling Multiple Devices to Reduce Output Resistance C1A C1B 6 6 2 3 2 5 1 1 5 3 C2 V OUT V OUT = 2 x VIN R OUT = R OUT OF SINGLE DEVICE V IN NUMBER OF DEVICES TC1240 "1" TC1240 "n" . . . . . . SHDN SHDN Shutdown Control 4 4 V IN PARALLELING DEVICES To reduce the value of ROUT, multiple TC1240s can be connected in parallel (Figure 5). The output resistance will be reduced by a factor of N where N is the number of TC1240s. Each device will require its own pump capacitor (C1x), but all devices may share one resevoir capacitor (C2). However, to preserve ripple performance the value of C2 should be scaled according to the number of paralleled TC1240s. LAYOUT CONSIDERATIONS As with any switching power supply circuit good layout practice is recommended. Mount components as close together as possible to minimize stray inductance and capacitance. Also use a large ground plane to minimize noise leakage into other circuitry. TC1240 DEMO CARD The TC1240 Demo Card is a 1.25” x 1.0” card contain- ing a TC1240 and all of the necessary external components that allow the user to evaluate the device’s ability to gener- ate a 2X non-regulated output voltage. The demo card is fully assembled with the required external capacitors along with a variable load resistor that allows the user to vary the output load current of the output stage. For convenience, several test points and jumpers are available for measuring various voltages and currents on the circuit board. Figure 6. TC1240 Demo Card Schematic |
Número de pieza similar - TC1240 |
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Descripción similar - TC1240 |
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