BQ51020: BQ51020 OVP Condition

Mason Noh

Part Number: BQ51020

I want to know about OVP condition of bq51020.

below comment is in datasheet of bq51221. Is it apply to bq51020 equally?

- bq51221

Over Voltage : 0x04 : VRECT target does not converge(3)

(3) If the voltage on the RECT pin does not reach the required value (typically 8 V) within 64 error packets
during startup (weak coil coupling), the receiver sends EPT-OV and the transmitter will shut off.

over 7 years ago

0 Bill Johns over 7 years ago

TI__Guru 65846 points

This can be seen by looking at the V-rect signal in the RX. The voltage will not reach 8V and time between packets will remain at about 30mS.

0 Mason Noh over 7 years ago in reply to Bill Johns

Expert 2490 points

So you mean it's possible to send EPT04 when voltage at RECT is under 8V?

0 Bill Johns over 7 years ago in reply to Mason Noh

TI__Guru 65846 points

For the non-convergence condition this could be voltage is high of target or low of target, key thing to look for will be control error packets at a 30mS rate. The normal rate is 250mS.
V-rect target voltage will change with setting of Vout and output current. 8V can be the target voltage but others are possible.

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BQ51020: BQ51020 OVP Condition