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LM60440 Datasheet(PDF) 15 Page - Texas Instruments |
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LM60440 Datasheet(HTML) 15 Page - Texas Instruments |
15 / 38 page SW ON OUT IN f t V V ˜ d 15 LM60440, LM60430 www.ti.com SNVSBN5A – FEBRUARY 2020 – REVISED JUNE 2020 Product Folder Links: LM60440 LM60430 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Device Functional Modes (continued) 8.4.3 Minimum Switch On-Time Every switching regulator has a minimum controllable on-time dictated by the inherent delays and blanking times associated with the control circuits. This imposes a minimum switch duty cycle and, therefore, a minimum conversion ratio. The constraint is encountered at high input voltages and low output voltages. To help extend the minimum controllable duty cycle, the LM604x0 automatically reduces the switching frequency when the minimum on-time limit is reached. This way the converter can regulate the lowest programmable output voltage at the maximum input voltage. An estimate for the approximate input voltage, for a given output voltage, before frequency foldback occurs is found in Equation 2. The values of tON and fSW can be found in the Electrical Characteristics table. As the input voltage is increased, the switch on-time (duty-cycle) reduces to regulate the output voltage. When the on-time reaches the limit, the switching frequency drops, while the on-time remains fixed. (2) |
Similar Part No. - LM60440_V01 |
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Similar Description - LM60440_V01 |
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