SLIS178B October 2017 – January 2018 TPS92830-Q1
The TPS92830-Q1 device has three independent constant-current driving channels. Each channel sets channel current with an external high-side current-sense resistor, RSNSx. Channel current is set as V(CS_REG) / RSNSx.
Considering that both ICTRL and DERATE voltages reduce current-sense voltage V(CS_REG) independently, channel current can be calculated using the following equation. Each of the dimming ratios is described separately in following sections.