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Other Parts Discussed in Thread: TPS62866 My high current application may be thermally limited and I'd like to understand how to optimize the thermal performance of the high power density buck converters - in particular, what needs to be considered in…
Other Parts Discussed in Thread: UCC27289 Intro
Typically, most ICs are available in industry standard packages such as SOIC and DFN. Even among competitors, many devices are designed to have the same pinout so they can be easily replaced or upgraded…
The assertion or de-assertion of EN between the 120ms period is not accepted. See waveforms below.
Yellow is EN signal, Green is FLAG1 and Pink is FLAG3. A glitch of EN during the 120ms also does not reset the 120ms and is not accepted for the sequencing…
Other Parts Discussed in Thread: LM3880 , LM3881 The output will be high impedances. Figure 10 for the LM3880 datasheet and Figure 6 on the LM3881 datasheet shows FLAG following VCC.
For more LM388x FAQ click or type the tag in the search bar [FAQ…
As show in the data sheet VFLAG vs VIN (VCC), the FLAG voltage will be pulled low when VCC exceeds about 0.8V. The FLAG voltage reaches about 0.65v before true pulldown begins. The external power rail shall not be on if its enable threshold is above 0…
The behaviors of the device are unpredictable if EN stays asserted while VC ramps down below its minimum operating voltage.
For more LM388x FAQ click or type the tag in the search bar [FAQ] LM388x
Connecting the EN pin to VCC is not recommended. During power up, the EN voltage should be kept below the EN threshold until VCC rises above the minimum operating voltage. An undefined operation at the FLAG outputs can occur if EN is connected to VCC…
The test condition is that VCC=3.3 V and EN=3.3V. So it is an operating current when EN is high.
For more LM388x FAQ click or type the tag in the search bar [FAQ] LM388x
EN pin has a glitch free operation. The first timer will start counting at a rising threshold of EN, but will always reset if the EN pin is de-asserted before the first output FLAG is released. Please refer section 7.3.1 of https://www.ti.com/lit/ds/symlink…
