Traditional stability margins (such as gain margin ≥ 6dB and phase margin ≥ 50º) for space rated IC's are often more onerous than industrial and consumer electronics. The TPS7H1121 is designed to support a wide range of space rated output capacitors (generally 22μF to 220μF) while maintaining a 6dB gain margin and 50º phase margin without utilizing the included STAB pin for external compensation.

In addition to the TPS7H1121's wide intrinsic stability, the STAB pin may be utilized to insert an external RC compensation network that ties directly to the error amplifier's output. This architecture, as depicted in Figure 8-2, illustrates how an external compensation network is directly inserted prior to the pass element's buffer, which maximizes the efficacy of the inserted RC compensation circuit.

This level of efficacy for an external compensation network enables end-users of the TPS7H1121 to conduct in depth stability analysis and widen stability margins for the applied output load. Additionally, it enables utilization of output capacitors as low as 6.8μF while allowing flexibility in managing low-ESR capacitors.

Figure 8-2 Simplified Compensation Schematic