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LTC3589EUJ-PBF 数据表(PDF) 23 Page - Linear Technology |
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LTC3589EUJ-PBF 数据表(HTML) 23 Page - Linear Technology |
23 / 44 page LTC3589 23 3589p The value of R1 plays a role in setting the dynamics of the buck-boost voltage mode control loop. In general, a larger value for R1 will increase stability but reduce the speed of the transient response. A good starting point is to choose R1 equal to 1MΩ and calculate the value of R2 needed to set the target output voltage. If a large output capacitor is used, the bandwidth of the converter is reduced and R1 may be reduced to improve transient response. If a large inductor or small output capacitor is used then a larger R1 should be used to bring the loop toward more stable operation. Modes of Operations Table 9 shows the I2C command registers used to control the operating modes of the LTC3589 buck-boost converter. When command register SCR1 bit 6 is LOW, the LTC3589 buck-boost switching regulator operates in a fixed fre- quency pulse width modulation mode using voltage mode feedback control. A proprietary switching algorithm allows the converter to transition between buck, buck-boost, and boost modes without discontinuity in inductor current or loop characteristics. The switch topology is shown in the application circuit in Figure 4. Table 9. Buck-Boost Command Register Settings COMMAND REGISTER[BIT] VALUE SETTING SCR1[6] 0* 1 Continuous Mode Burst Mode Operation OVEN[3] 0* 1 Disable Enable SCR2[3] 0* 1 Wait for Output Below 300mV Before Enable Enable Immediately * Denotes Default Power-On Value When the input voltage is significantly greater than the output voltage, the buck-boost converter operates in buck mode. Switch D turns on continuously and switch C remains off. Switches A and B are pulse width modulated to produce the required duty cycle to support the output OPERATION Table 8. Inductors for Step-Down Switching Regulators 2 and 3 MANUFACTURERS PART NUMBER VALUE (μH) DCR (Ω) MAX DC CURRENT (A) SIZE (mm) W × L × H Coilcraft XPL4020-102ML XPL4020-152ML XPL4020-472ML 1.0 1.5 4.7 0.029 0.036 0.130 4.00 3.60 1.90 4.2 × 4.2 × 2.0 4.2 × 4.2 × 2.0 4.2 × 4.2 × 2.0 Cooper SD14-1R2-R SD14-3R2-R SD25-3R3-R 1.2 3.2 3.3 0.034 0.066 0.038 3.35 2.00 2.21 5.2 × 5.2 × 1.45 5.2 × 5.2 × 1.45 4.8 × 4.8 × 2.5 Sumida CDRH5D16NP-4R7N CDRH38D16RHPNP-3R3M 4.7 3.3 0.064 0.059 2.05 1.46 5.6 × 5.6 × 1.8 4.2 × 4.2 × 1.8 TDK VLF5014ST-2R2N2R3 VLCF5020T-2R7N2R2-1 VLCF5020T-3R3N2R0-1 2.2 2.7 3.3 0.073 0.083 0.096 2.3 2.2 2 4.8 × 4.6 × 1.4 5.0 × 5.0 × 2.0 5.0 × 5.0 × 2.0 TOKO 1124BS-2R4N 1124BS-3R3N 2.4 3.3 0.065 0.074 2.30 2.10 4.5 × 4.7 × 1.8 4.5 × 4.7 × 1.8 Tokin H-DI-0520-3R3 H-DI-0520-4R7 H-DI-0630-3R8 H-DI-0630-4R7 3.3 4.7 3.8 4.7 0.062 0.090 0.040 0.043 2.00 1.80 2.00 1.90 5.3 × 5.3 × 2.0 5.3 × 5.3 × 2.0 6.3 × 6.3 × 3.0 6.3 × 6.3 × 3.0 Wurth 744043004 744052002 7440530047 744042003 7440430022 4.7 2.5 4.7 3.3 2.2 0.052 0.030 0.030 0.055 0.023 1.55 2.4 2.4 1.95 2.5 5.0 × 5.0 × 3.0 5.8 × 5.8 × 1.8 5.8 × 5.8 × 2.8 4.8 × 4.8 × 1.8 4.8 × 4.8 × 2.8 |
类似零件编号 - LTC3589EUJ-PBF |
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类似说明 - LTC3589EUJ-PBF |
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