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LMR16006: ECO mode

Amelie Zheng
Genius 10865 points
Part Number: LMR16006

Hi Team，

Question 1: At present, we have confirmed that the camera will have a high probability of flickering and horizontal stripes in low light or high voltage conditions. After analyzing the faulty parts, customer found that the power chip LMR16006 has entered the ECO mode, which causes the output voltage to fluctuate.

Now customer want to learn more about the parameters of the chip entering the eco mode, such as the peak current determined by the ECO and the error range, the specific relationship with the input voltage, output voltage, and inductance. 


Question 2: When the BST pin capacitance of LMR16006 is disconnected, customer found that its power chip input voltage can work normally when the input voltage is below 11.8V, but when it exceeds 11.8V, the power chip does not work. Why it happened?

Thanks!

  • 0
    TI__Mastermind 27030 points

    Hi  :

    1. The LMR16006 operates in ECO mode at light load currents to improve efficiency by reducing switching and gate drive losses. The LMR16006 is designed so that if the output voltage is within regulation and the peak switch current at the end of any switching cycle is below the sleep current threshold, IINDUCTOR ≤ 80 mA, the device enters ECO mode. For ECO mode operation, the LMR16006 senses peak current, not average or load current, so the load current where the device enters ECO mode is dependent on VIN, VOUT and the output inductor value. When the load current is low and the output voltage is within regulation, the device enters an ECO mode and draws only 28 µA input quiescent current.

    2. in what load condition it can work? can customer provide Boot voltage waveform? 

    Thanks

    Daniel Li

  • 0 in reply to Daniel Li14
    TI__Mastermind 27030 points

    Hi Amelie:

    we can move this question to email, I will close this question and send you a email.

    Thanks