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TCM680EOA Fiches technique(PDF) 5 Page - TelCom Semiconductor, Inc |
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TCM680EOA Fiches technique(HTML) 5 Page - TelCom Semiconductor, Inc |
5 / 7 page 4-17 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TCM680 +5V TO ±10V VOLTAGE CONVERTER Table 1. ROUT vs. C1 ,C2 C1, C2 ( µF) ROUT ( Ω) 0.1 1089 0.47 339 1 232 3.3 165 4.7 157 10 146 22 141 100 137 Table 2. VRIPPLE (p-p) vs. C3, C4 (IOUT = 10mA) C3, C4 ( µF) VRIPPLE (mV) 0.47 1540 1 734 3.3 236 4.7 172 10 91 22 52 100 27 Paralleling Devices Paralleling multiple TCM680s reduces the output resis- tance of both the positive and negative converters. The effective output resistance is the output resistance of a single device divided by the number of devices. As illus- trated in Figure 7, each requires separate pump capacitors C1 and C2, but all can share a single set of reservoir capacitors. ±5V Regulated Supplies From A Single 3V Battery Figure 8 shows a complete ±5V power supply using one 3V battery. The TCM680 provides +6V at V + OUT, which is regulated to +5V by the TC55, and –5V by the negative LDO. The input to the TCM680 can vary from 3V to 6V without affecting regulation appreciably. With higher input voltage, more current can be drawn from the outputs of the TCM680. With 5V at VIN, 10mA can be drawn from both regulated outputs simultaneously. Assuming 150 Ω source resistance for both converters, with (I + L + IL) = 20mA, the positive charge pump will droop 3V, providing +7V for the negative charge pump. C1 C2 V OUT V OUT C OUT V IN V IN V IN GND GND 10 µF 10 µF 22 µF 10 µF 10 µF NEGATIVE SUPPLY TCM680 C2 C1 C2 C1 C1 C2 TCM680 GND + – + – + – + – + – + + – – + – – – – + – Figure 7. Paralleling TCM680 for Lower Output Source Resistance |
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Description similaire - TCM680EOA |
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