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ADP1621ARMZ-R7 数据表(PDF) 25 Page - Analog Devices |
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ADP1621ARMZ-R7 数据表(HTML) 25 Page - Analog Devices |
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25 / 32 page  ADP1621 Rev. A | Page 25 of 32 Low Input and High Output Boost Converter Figure 36 shows a typical application boost converter circuit that operates at a switching frequency of 200 kHz with VIN = 5 V and VOUT = 30 V with a 1 A load. The duty cycle for this circuit is about 83%. A higher switching frequency can be selected, but the switching power loss in the MOSFET increases and a bigger MOSFET is needed. For switch-node voltages greater than 30 V, a sense resistor, RCS, is needed because the absolute maximum voltage at CS is 33 V. High Input Voltage Boost Converter Circuit Input voltages higher than 5.5 V are possible with the addition of a resistor and an NPN transistor, as shown in Figure 37, or just with a single resistor, as shown in Figure 38. When there is a wide input voltage range, it is sometimes desirable to use the pass NPN transistor, as shown in Figure 37. If the input voltage range is narrow, a single resistor connecting to the IN and PIN pins is sufficient, as shown in Figure 38. In Figure 37, Resistor R3 limits the current going into IN, and there is power loss in this resistor. The voltages at IN and PIN are both clamped to about 5.5 V, which can rise to as high as 5.9 V when the shunt current is 30 mA. Refer to Figure 9 for the I-V characteristics of the shunt regulators. Ensure that Resistor R3 is physically large enough to handle the power dissipation. For switch-node voltages higher than 30 V, a current-sense resistor is needed and the CS pin senses the voltage across the sense resistor. ADP1621 PIN GATE CS AGND PGND SDSN COMP FREQ GND IN FB R1 115kΩ 1% R2 4.87kΩ 1% C1 47µF 6.3V ×2 L1 7.8µH M1 CCOMP 20pF fOSC = 200kHz C1 = MURATA GRM31CR60J476M COUT1 = MURATA GRM31CR72A10 COUT2 = MURATA GRM55ER71H475K COUT3 = RUBYCON 50ZL330M10x23 M1 = VISHAY SUD50N06-07L D1 = IRF 15TQ060 L1 = COILCRAFT DO501DH-782ML RS 909Ω RCS 3mΩ RFREQ 100kΩ 1% D1 C3 1µF 10V C4 0.1µF 10V C2 120pF RCOMP 1.6MΩ VIN = 5V COUT1 1µF 100V COUT2 4.7µF 50V COUT3 330µF 50V ×2 VOUT = 30V 1A Figure 36. Low Input, High Output Boost Converter ADP1621 PIN GATE CS AGND PGND SDSN COMP FREQ GND IN FB R1 115kΩ 1% R3 700Ω R2 4.87kΩ 1% C1 22µF 16V ×2 L1 8.2µH M1 CCOMP 220pF fOSC = 560kHz C1 = MURATA GRM32ER61C226K COUT1 = MURATA GRM31CR72A105K COUT2 = MURATA GRM55ER71H475K COUT3 = RUBYCON 50ZL220M10x23 M1 = IRF7470 Q1 = SIGNAL NPN TRANSISTOR D1 = MBRB7H50 L1 = COILCRAFT MSS1260-822ML RS 402Ω RCS 3mΩ RFREQ 34.8kΩ D1 Q1 C4 0.1µF 10V C3 1µF 10V C2 120pF RCOMP 2MΩ VIN = 8V TO 15V COUT1 1µF 100V COUT2 4.7µF 50V COUT3 330µF 50V ×2 VOUT = 30V 1A Figure 37. High Input Voltage and High Output Voltage Converter |
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