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TC660EPA Fiches technique(PDF) 6 Page - TelCom Semiconductor, Inc |
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TC660EPA Fiches technique(HTML) 6 Page - TelCom Semiconductor, Inc |
6 / 8 page 4-10 TELCOM SEMICONDUCTOR, INC. TC660 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER The output characteristics of the circuit in Figure 3 are those of a nearly ideal voltage source in series with 6.5 Ω. Thus, for a load current of –100mA and a supply voltage of +5V, the output voltage would be – 4.35V. The dynamic output impedance of the TC660 is due, primarily, to capacitive reactance of the charge transfer capacitor (C1). Since this capacitor is connected to the output for only 1/2 of the cycle, the equation is: Paralleling Devices Any number of TC660 voltage converters may be paral- leled to reduce output resistance (Figure 4). The reservoir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resultant output resistance would be approximately: 2 2 πf C1 XC = = 0.21 Ω, where f = 10 kHz and C1 = 150 µF. Figure 4. Paralleling Devices Lowers Output Impedance Dos and Don'ts • Do not exceed maximum supply voltages. • Do not connect the LV terminal to GND for supply voltages greater than 3.0V. • Do not short circuit the output to V + in inverting mode and for more than 10 sec (a very slow startup!) in doubler mode. • When using polarized capacitors in the inverting mode, the + terminal of C1 must be connected to pin 2 of the TC660 and the + terminal of C2 must be connected to GND. Simple Negative Voltage Converter Figure 3 shows typical connections to provide a nega- tive supply where a positive supply is available. A similar scheme may be employed for supply voltages anywhere in the operating range of +1.5V to +5.5V, keeping in mind that pin 6 (LV) is tied to the supply negative (GND) only for supply voltages below 3.0V. ROUT (of TC660) n (number of devices) ROUT = Figure 3. Simple Negative Converter 1 2 3 4 8 7 6 5 TC660 150 µF + V + 150 µF + VOUT* 1. VOUT = –V + for 1.5V ≤ V+ ≤ 5.5V NOTES: * C1 C2 1 2 3 4 8 7 6 5 TC660 V + 1 2 3 4 8 7 6 5 TC660 C1 RL C2 C1 "n" "1" + |
Numéro de pièce similaire - TC660EPA |
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Description similaire - TC660EPA |
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