A Power over Data Lines, PoDL, system, which enables power and differential data transmission over a single wire pair, the Power over Data Lines system including a passive coupling network (C1, C2, L1, L2) in Power Sourcing Equipment coupled to the wire pair for coupling a DC power signal and differential data to the wire pair, and a passive decoupling network (C3, C4, L3, L4) in a Powered Device coupled to the wire pair for decoupling the DC power signal and differential data from the wire pair, the improvement comprising: dV/dt limiting circuitry, separate from the passive coupling network and the passive decoupling network, comprising one or more active components, wherein the dV/dt limiting circuitry limits dV/dt in the power signal, wherein the Powered Device includes a DC-DC converter (36, 38, M1, M2, L5, Cout) for converting incoming PoDL voltage to a target voltage (Vout) for a Powered Device load, wherein the dV/dt limiting circuitry comprises: a duty cycle slew rate limiting circuit coupled to the DC-DC converter for limiting a slew rate of the duty cycle of the converter in response to changes in the Powered Device load current, resulting in a reduced dV/dt in the power signal, wherein the duty cycle slew rate limiting circuit comprises: a differentiator circuit (32, 34) that outputs a first signal proportional to dV/dt in the power signal; and a DC-DC converter controller circuit that receives a first feedback signal corresponding to an output voltage (Vout) of the converter and regulates the output voltage to be a target voltage, wherein the first signal is provided to the converter controller to limit the dV/dt to a maximum value by limiting the slew rate of the duty cycle of the converter in response to changes in the Powered Device load. dV/dt limiting circuitry, separate from the passive coupling network and the passive decoupling network, comprising one or more active components, wherein the dV/dt limiting circuitry limits dV/dt in the power signal, wherein the Powered Device includes a DC-DC converter (36, 38, M1, M2, L5, Cout) for converting incoming PoDL voltage to a target voltage (Vout) for a Powered Device load, wherein the dV/dt limiting circuitry comprises: a duty cycle slew rate limiting circuit coupled to the DC-DC converter for limiting a slew rate of the duty cycle of the converter in response to changes in the Powered Device load current, resulting in a reduced dV/dt in the power signal, wherein the duty cycle slew rate limiting circuit comprises: a differentiator circuit (32, 34) that outputs a first signal proportional to dV/dt in the power signal; and a DC-DC converter controller circuit that receives a first feedback signal corresponding to an output voltage (Vout) of the converter and regulates the output voltage to be a target voltage, wherein the first signal is provided to the converter controller to limit the dV/dt to a maximum value by limiting the slew rate of the duty cycle of the converter in response to changes in the Powered Device load. a duty cycle slew rate limiting circuit coupled to the DC-DC converter for limiting a slew rate of the duty cycle of the converter in response to changes in the Powered Device load current, resulting in a reduced dV/dt in the power signal, wherein the duty cycle slew rate limiting circuit comprises: a differentiator circuit (32, 34) that outputs a first signal proportional to dV/dt in the power signal; and a DC-DC converter controller circuit that receives a first feedback signal corresponding to an output voltage (Vout) of the converter and regulates the output voltage to be a target voltage, a differentiator circuit (32, 34) that outputs a first signal proportional to dV/dt in the power signal; and a DC-DC converter controller circuit that receives a first feedback signal corresponding to an output voltage (Vout) of the converter and regulates the output voltage to be a target voltage, wherein the first signal is provided to the converter controller to limit the dV/dt to a maximum value by limiting the slew rate of the duty cycle of the converter in response to changes in the Powered Device load.