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MAX8724 Datasheet(PDF) 23 Page - Maxim Integrated Products |
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MAX8724 Datasheet(HTML) 23 Page - Maxim Integrated Products |
23 / 27 page the charge-current amplifier transconductance = 1µA/mV. GMIN is the DC-DC converter transconductance = 3.3A/V. The CCS loop is a single-pole system with a dom- inant pole compensation set by fP_CS: The loop transfer function is given by: Since: Then, the loop transfer function simplifies to: The crossover frequency is given by: The CCS loop dominant compensation pole: where the GMS amplifier output impedance, ROGMS = 10M Ω. To calculate the CCI loop compensation pole, CCS: GMS = 1µA/mV GMIN = 3.33A/V ROGMS = 10M Ω f = 400kHz f RC PCS OGMS CS _ = × 1 2 π f GMS C CO CS CS _ = 2 π LTF GMS R sR C OGMS OGMS CS =× +× 1 GM ARS IN CSS = × 1 1 LTF GM A RS GMS R sR C IN CSS OGMS OGMS CS =× × × × +× 1 1 f RC PCS OGMS CS _ = × 1 2 π Low-Cost Multichemistry Battery Chargers ______________________________________________________________________________________ 23 GMIN CCS GMS CLS CCS ROGMS CSSP CSSN CSS RS1 Figure 9. CCS Loop Diagram CCS LOOP GAIN vs. FREQUENCY FREQUENCY (Hz) 100k 10k 110 100 1k -40 -20 0 20 40 60 80 100 -60 0.1 1M CCS LOOP PHASE vs. FREQUENCY FREQUENCY (Hz) 100k 10k 1k 100 10 1 -90 -75 -60 -45 -30 -15 0 -105 0.1 1M Figure 10. CCS Loop Gain/Phase vs. Frequency |
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