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TC7660SCOA713 Fiches technique(PDF) 7 Page - Microchip Technology |
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TC7660SCOA713 Fiches technique(HTML) 7 Page - Microchip Technology |
7 / 24 page 2001-2015 Microchip Technology Inc. DS20001467C-page 7 TC7660S 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. 3.1 Switching Frequency Boost Pin (Boost) By connecting the boost pin (pin 1), the switching frequency of the charge pump is increased from 10 kHz typical to 45 kHz typical. By connecting the boost pin (pin1), to the V+ pin (pin 8), the switching frequency of the charge pump is increased from 10 kHz typical to 45 kHz typical. 3.2 Charge Pump Capacitor (CAP+) Positive connection for the charge pump capacitor, or flying capacitor, used to transfer charge from the input source to the output. In the voltage-inverting configuration, the charge pump capacitor is charged to the input voltage during the first half of the switching cycle. During the second half of the switching cycle, the charge pump capacitor is inverted and charge is transferred to the output capacitor and load. It is recommended that a low ESR (equivalent series resistance) capacitor be used. Additionally, larger values will lower the output resistance. 3.3 Ground (GND) Input and output zero volt reference. 3.4 Charge Pump Capacitor (CAP-) Negative connection for the charge pump capacitor, or flying capacitor, used to transfer charge from the input to the output. Proper orientation is imperative when using a polarized capacitor. 3.5 Output Voltage (VOUT) Negative connection for the charge pump output capacitor. In the voltage-inverting configuration, the charge pump output capacitor supplies the output load during the first half of the switching cycle. During the second half of the switching cycle, charge is restored to the charge pump output capacitor. It is recommended that a low ESR capacitor be used. Additionally, larger values will lower the output ripple. 3.6 Low Voltage Pin (LV) The low voltage pin ensures proper operation of the internal oscillator for input voltages below 3.5V. The low voltage pin should be connected to ground (GND) for input voltages below 3.5V. Otherwise, the low voltage pin should be allowed to float. 3.7 Oscillator Control Input (OSC) The oscillator control input can be utilized to slow down or speed up the operation of the TC7660S. Refer to Section 5.4 “Changing the TC7660S Oscillator Frequency” , for details on altering the oscillator frequency. 3.8 Power Supply (V+) Positive power supply input voltage connection. It is recommended that a low ESR capacitor be used to bypass the power supply input to ground (GND). TABLE 3-1: PIN FUNCTION TABLE Pin No. Symbol Description 1 BOOST Switching Frequency boost pin 2CAP+ Charge pump capacitor positive terminal 3 GND Ground terminal 4CAP- Charge pump capacitor negative terminal 5VOUT Output voltage 6 LV Low voltage pin. Connect to GND for V+ < 3.5V 7 OSC Oscillator control input. Bypass with an external capacitor to slow the oscillator. 8V+ Power supply positive voltage input |
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