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TC7660HEOA Scheda tecnica(PDF) 6 Page - Microchip Technology |
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TC7660HEOA Scheda tecnica(HTML) 6 Page - Microchip Technology |
6 / 8 page 6 TC7660H HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H-2 10/1/96 © 2001 Microchip Technology Inc. DS21466A Efficient Positive Voltage Multiplication/ Conversion Since the switches that allow the charge pumping op- eration are bidirectional, the charge transfer can be per- formed backwards as easily as forwards. Figure 9 shows a TC7660H transforming –5V to +5V (or +5V to +10V, etc.). The only problem here is that the internal clock and switch- drive section will not operate until some positive voltage has been generated. An initial inefficient pump, as shown in Figure 9, could be used to start this circuit up, after which it will bypass the diode and resistor shown dotted in Figure 9. 1 2 3 4 8 7 6 5 + VOUT = –V – 1.0 µF + 1 M Ω V– INPUT C1 1.0 µF TC7660H Figure 9. Positive Voltage Conversion TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1) 500 450 400 200 150 100 50 0 –55 –25 0 +25 +50 +75 +100 +125 Output Source Resistance vs. Temperature V + = +2V V + = +5V 78 10k 1k 100 Ω TA = +25°C Output Source Resistance vs. Supply Voltage 6 5 4 3 2 1 0 SUPPLY VOLTAGE (V) TEMPERATURE ( °C) IOUT = 1 mA 10 Ω OUTPUT CURRENT (mA) 0 0 Output Voltage vs. Output Current CI C2 =1µF –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 10 20 30 40 50 60 70 80 90 100 TA = +25°C LV OPEN LOAD CURRENT (mA) Output Voltage vs. Load Current 1 0 5 4 3 2 0 –1 –2 –3 –4 –5 10 20 30 40 50 60 70 80 TA = +25°C V+ = +5V SLOPE 55 Ω |
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