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ADP1621ARMZ-R7 数据表(PDF) 27 Page - Analog Devices |
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ADP1621ARMZ-R7 数据表(HTML) 27 Page - Analog Devices |
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27 / 32 page  ADP1621 Rev. A | Page 27 of 32 SEPIC CONVERTER CIRCUIT A single-ended primary inductance converter (SEPIC) topology is shown in Figure 39. This topology is useful for an unregulated input voltage, where the regulated output voltage falls within the input voltage range. The input and output are dc-isolated by a coupling capacitor, C5. L1 and L2 are coupled inductors with a 1:1 turn ratio, which saves space on the PCB. In steady state, the average voltage across C5 is the input voltage. When the MOSFET turns on and the diode turns off, the input voltage provides energy to L1, and C5 provides energy to L2. The output capacitor, COUT, supplies the load current during this time. When the MOSFET turns off and the diode turns on, the energy in L1 and L2 is released to charge the output capacitor, COUT, and the coupling capacitor, C5, as well as to supply current to the load. LOW VOLTAGE POWER-INPUT CIRCUIT The ADP1621 can be configured to run from a low voltage (as low as 1 V) power input. The power source generally needs to have a high current capability, such as a fuel cell. Figure 40 illustrates such an application, where the voltage of the power input is 1 V and the voltage of the chip supply to the IN and PIN pins is provided by an auxiliary low power source. ADP1621 IN GATE PGND AGND FB SDSN COMP FREQ GND PIN CS R1 17.4kΩ 1% R2 10kΩ 1% C1 22µF 10V ×2 C5 10µF 10V X5R L2 2.4µH L1 2.4µH M1 CCOMP 1.2nF fOSC = 325kHz C1 = MURATA GRM332ER61A226K COUT2 = SANYO POSCAP 6TPE150MI C5 = MURATA GRM21BR61A106K L1, L2 = COUPLED INDUCTORS, 1:1 RATIO, BH ELECTRONICS BH510-1006 M1 = VISHAY Si7882DP D1 = VISHAY SSC53L RS 80Ω COUT1 1µF 10V RFREQ 65kΩ COUT2 150µF 6.3V ×3 VOUT = 3.3V 2A VIN = 3V TO 5.5V D1 C3 1µF 10V C4 0.1µF 10V C2 33pF RCOMP 26kΩ Figure 39. A SEPIC DC/DC Converter ADP1621 IN GATE PGND AGND FB SDSN COMP FREQ GND PIN CS R1 35.7kΩ 1% R2 11.5kΩ 1% C1 100µF X5R 6.3V L1 2.2µH M1 CCOMP 56nF COUT1 1µF 10V fOSC = 600kHz C1 = MURATA GRM32ER60J107ME20 COUT2 = MURATA GRM21BR60J106K COUT3 = SANYO POSCAP 6TPE150MI M1 = VISHAY Si7882DP D1 = MBRD835L L1 = TOKO FDV0630-2R2M RS 249Ω COUT2 10µF 6.3V RFREQ 31.6kΩ 1% COUT3 150µF 6.3V ×2 VOUT = 5V 1A VIN = 1V VCC = 2.9V TO 5.5V D1 C3 1µF 10V C4 0.1µF 10V C2 260pF RCOMP 9.4kΩ Figure 40. Low Voltage Power-Input Application Circuit |
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