Document Number: 002-03396 Rev. *D

Page 13 of 23

S6BP501A, S6BP502A

PRELIMINARY

8.2

Each Function Block

Each function block is described in this section.

Under Voltage Lockout (UVLO)

This IC equips an UVLO function in order to prevent itself from operating unintentionally and from destructing or deteriorating its

subsequent devices. The UVLO block monitors the VB voltage. Once VB unintentionally drops below the IC shutdown voltage

Over Voltage Detection and Protection (OVD, OVP)

When an output voltage exceeds the over voltage detection (OVD) voltage, the corresponding PG is asserted the low level. In case

any output voltage exceeds the over voltage protection (OVP) voltage, all output channels stop working to protect the connected

devices. When all output voltage fall below the over voltage protection release voltage, this IC returns to the normal operation.

Figure 8-2 Over Voltage Detection and Over Voltage Protection Sequence

Hi-Z

Switching

Hi-Z

Switching

OFF

ON

OFF

Time

Under Voltage Detection (UVD)

When an output voltage falls below the under voltage detection (UVD) voltage, the corresponding PG pin is asserted the low level

while the corresponding output channel keeps working. When the output voltage exceeds the under voltage detection release

voltage, each PG will be recovered Hi-Z.