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LT3800IFE-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LT3800IFE-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 24 page  LT3800 9 3800fb The onboard VCC regulator will provide gate drive power for start-up under all conditions with total MOSFET gate charge loads up to 180nC. The regulator can operate the LT3800 continuously, provided the VINvoltageand/orMOSFETgate charge currents do not create excessive power dissipation in the IC. Safe operating conditions for continuous regu- lator use are shown in Figure 1. In applications where these conditions are exceeded, VCC must be derived from an external source after start-up. APPLICATIO S I FOR ATIO Charge Pump Doubler TOTAL FET GATE CHARGE (nC) 0 10 20 30 40 50 60 70 50 100 150 200 3800 F01 SAFE OPERATING CONDITIONS Figure 1. VCC Regulator Continuous Operating Conditions VOUT 1 µF B0520 B0520 1 µF Si1555DL LT3800 VCC BG VOUT 1 µF B0520 B0520 1 µF 1 µF Si1555DL Si1555DL LT3800 VCC BG B0520 3800 AI01 TG VOUT 3800 AI04 VCC SW BG N • • LT3800 Inductor Auxiliary Winding Charge Pump Tripler In LT3800 converter applications with output voltages in the 9V to 20V range, back-feeding VCC and VBOOST from the converter output is trivial, accomplished by connect- ing diodes from the output to these supply pins. Deriving these supplies from output voltages greater than 20V will require additional regulation to reduce the feedback volt- age. Outputs lower than 9V will require step-up techniques to increase the feedback voltage to something greater than the 8V VCC regulated output. Low power boost switchers are sometimes used to provide the step-up function, but a simple charge-pump can perform this function in many instances. |
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