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I use the LM34927 to converter 24V to 12V to drive the 16pcs relays. The relay core resistance value is 240Ω. So the output current of 12V about need to 711mA. And I check the datasheet of the LM34927 in page6 has the current minimum limit is 0.7A. So I want to ask below the two questions.
1. Can I use the LM34927 to converter the 24V to 12V to drive the 16pcs realys about 700mA?
2. If question 1 answer is Yes, how to decide the output inductor value, does it have any limit?
Hi Brian,
Thanks for the data sharing.
Firstly I want to clarify that the current limit 0.7V is the minimum value in the datasheet. the typical value is 1.02A and maximum is 1.3A .
So your test result maybe can't reflect the minimum 0.7V current limit. And it's peak current of inductor , have no relationship with input voltage.
About inductor choice , usually the peak to peak current of inductor equal to 30% output load current . that is just a start point . smaller peak to peak current means large value of inductance. vice versa.
Thanks.