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TC1220ECH Fiches technique(PDF) 6 Page - Microchip Technology |
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TC1220ECH Fiches technique(HTML) 6 Page - Microchip Technology |
6 / 16 page TC1219/TC1220 DS21366B-page 6 2002 Microchip Technology Inc. 4.3 Capacitor Selection In order to maintain the lowest output resistance and output ripple voltage, it is recommended that low ESR capacitors be used. Additionally, larger values of C1 will lower the output resistance and larger values of C2 will reduce output ripple. (Equation 4-1(b) and Equation 4-3). Table 4-1 shows various values of C1 and the corresponding output resistance values @ +25°C. It assumes a 0.1 Ω ESRC1 and 2Ω RSWITCH. Table 4-2 shows the output voltage ripple for various values of C2. The VRIPPLE values assume 10mA output load current and 0.1 Ω ESRC2. TABLE 4-1: OUTPUT RESISTANCE VS. C1 (ESR = 0.1 Ω) TABLE 4-2: OUTPUT VOLTAGE RIPPLE VS. C2 (ESR = 0.1 Ω) IOUT 10mA 4.4 Input Supply Bypassing The VIN input should be capacitively bypassed to reduce AC impedance and minimize noise effects due to the internal switching of the device The recommended capacitor depends on the configuration of the TC1219/TC1220. 4.5 Shutdown Input The TC1219/TC1220 is enabled when SHDN is high, and disabled when SHDN is low. This input cannot be allowed to float. (If SHDN is not required, see the TCM828/829 data sheet.) The SHDN input can be only driven to 0.5V above VIN to avoid significant current flows. 4.6 Voltage Inverter The most common application for charge pump devices is the inverter (Figure 4-3). This application uses two external capacitors: C1 and C2 (plus a power supply bypass capacitor, if necessary). The output is equal to -VIN plus any voltage drops due to loading. Refer to Table 4-1 and Table 4-2 for capacitor selection. FIGURE 4-3: VOLTAGE INVERTER TEST CIRCUIT C1 ( µF) TC1219 ROUT(Ω) TC1220 ROUT(Ω) 1 100 45 3.3 42 25 10 25 19.4 30 19.3 17.5 C2 ( µF) TC1219 VRIPPLE (mV) TC1220 VRIPPLE (mV) 1419 145 3.3 128 45 10 44 16 30 16 7 3 2 4 5 1 C3 C1 C2 VIN VOUT RL TC1219 TC1220 C1– IN OUT C1+ GND Device C1 C2 C3 TC1219 10 µF 10 µF 10 µF TC1220 3.3 µF 3.3 µF 3.3 µF SHDN 6 + + + |
Numéro de pièce similaire - TC1220ECH |
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Description similaire - TC1220ECH |
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