The charge pump generates a robust supply that always tracks 15 V below VFLOAT, even if that voltage is below ground. The voltage also can be placed above VFLOAT by simply reversing the diodes and the polarized capacitors
Figure 2. The charge pump generates a robust supply that always tracks 15 V below VFLOAT, even if that voltage is below ground. The voltage also can be placed above VFLOAT by simply reversing the diodes and the polarized capacitors