ZHCSKX0 February 2020 TPS59632-Q1
PRODUCTION DATA.
Setting a load line slope is effective in significantly reducing the output capacitors. Therefore, although the design requirement does not call for a load-line, we use the output voltage tolerance specification to determine an appropriate load-line. Figure 23 shows how we first determine the load-line window.
This nominal DC load-line window is now used to set the load-line slope across the range of load current from 0 to Icc,max as shown in Figure 24.
The load-line slope RLL is first determined as shown in Figure 24 using the equation in Equation 6. In the device, TPS59632-Q1, the load-line is determined by the current sense resistance, RCS, the current sense amplifier gain, ACS, and the gain of the droop amplifier (ADROOP) as shown in Equation 7.
The gain of the droop amplifier, (ADROOP can therefore be determined by Equation 7. This gain is set by the external resistors RDROOP (between the DROOP pin and the COMP pin) and resistor RCOMP (between the COMP pin and the VREF pin) as shown in Equation 8. We fix the value of RDROOP to 19.6 kΩ, and thereby RCOMP is calculated to 1.87 kΩ.