Hello Zac,
First off, let me explain the difference between SPR and SPL.
Static Power Reduction (SPR) sets a fixed limit on the input power: by choosing the value for R7 you can set a maximum input current. This is usefull if you know in advance that you are going to supply the wireless transmitter with an adapter that can supply a maximum current of e.g. 1.6A.
Smart Power Limiting (SPL) is also limiting the input current, but in another (smart) way: assume that you do not know which adapter you will be using so you do not know what the maximum current will be. Assume that you use an adapter that can supply a maximum current of 1A, and you connect a load that draws 1.5A, then the output voltage of the adapter will collaps, the NXQ1TXH5 will restart, the adapter voltage will rise again, and the NXQ1TXH5 will start to draw too much current again. So you have a system that is continuously starting&stopping.
If you however enable the smart power limit, then the NXQ1TXH5 will monitor the input voltage and if this voltage drops below 4.2V, then the switching frequency is increased so less power is supplied to the load effectively reducing the input current. In this way the input current of the NXQ1TXH5 charger will be regulated to about 1A, so the the charger keeps charging however not at full power. This is indicated by a blinking LED.
Note that the receiver is not receiving the power it is requesting: it gets less power and some receivers do not accept that: they go into a protection because the charger is not responsive.
The SPL can only be switched on or off, see Table 1.
If you use smart power limiting, then you do not use static power reduction.
Best regards,
Tomas
