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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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MAX1908 Arkusz danych(PDF) 22 Page - Maxim Integrated Products |
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MAX1908 Arkusz danych(HTML) 22 Page - Maxim Integrated Products |
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22 / 30 page  Low-Cost Multichemistry Battery Chargers 22 ______________________________________________________________________________________ CCV Loop Definitions Compensation of the CCV loop depends on the para- meters and components shown in Figure 5. CCV and RCV are the CCV loop compensation capacitor and series resistor. RESR is the equivalent series resistance (ESR) of the charger output capacitor (COUT). RL is the equivalent charger output load, where RL = VBATT/ ICHG. The equivalent output impedance of the GMV amplifier, ROGMV ≥ 10MΩ. The voltage amplifier transconductance, GMV = 0.125µA/mV. The DC-DC converter transconductance, GMOUT = 3.33A/V: where ACSI = 20, and RS2 is the charging current- sense resistor in the Typical Application Circuits. The compensation pole is given by: The compensation zero is given by: The output pole is given by: where RL varies with load according to RL = VBATT/ICHG. Output zero due to output capacitor ESR: The loop transfer function is given by: Assuming the compensation pole is a very low frequency, and the output zero is a much higher fre- quency, the crossover frequency is given by: To calculate RCV and CCV values of the circuit of Figure 2: Cells = 4 COUT = 22µF VBATT = 16.8V ICHG = 2.5A GMV = 0.125µA/mV GMOUT = 3.33A/V ROGMV = 10MΩ f = 400kHz Choose crossover frequency to be 1/5th the MAX1908’s 400kHz switching frequency: Solving yields RCV = 26kΩ. Conservatively set RCV = 1kΩ, which sets the crossover frequency at: fCO_CV = 3kHz Choose the output-capacitor ESR so the output-capacitor zero is 10 times the crossover frequency: f RC MHz Z ESR ESR OUT _ . = × = 1 2 2 412 π R fC ESR CO CV OUT = ×× × = 1 210 024 π _ . Ω f GMV R GM C kHz CO CV CV OUT OUT _ = ×× = 2 80 π f GMV R GM C CO CV CV OUT OUT _ = ×× 2 π LTF GM R GMV R sC R sC R sC R sC R OUT L OGMV OUT ESR CV CV CV OGMV OUT L =× × × × +× () +× () +× () +× () 11 11 f RC Z ESR ESR OUT _ = × 1 2 π f RC P OUT L OUT _ = × 1 2 π f RC ZCV CV CV _ = × 1 2 π f RC PCV OGMV CV _ = × 1 2 π GM ARS OUT CSI = × 1 2 GMOUT BATT CCV GMV REF RCV CCV ROGMV RESR RL COUT Figure 5. CCV Loop Diagram |
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