ISO808

描述

The ISO808 and ISO808-1, are galvanic isolated 8-channel drivers featuring a low supply current. Each driver contains 2 independent galvanic isolated voltage domains (V_CC and V_DD for the Process and Control Logic stages, respectively). The ICs are intended for driving any kind of load with one side connected to ground.

Active channel current limitation (OVL) combined with thermal shutdown (OVT), independent for each channel, protects the device against overload.

Built-in thermal shutdown protects each channel from overtemperature and overload: each overheated channel automatically turns OFF after its junction temperature triggers the protection threshold (T_JSD). The channel turns back ON if its junction temperature decreases lower than restart threshold (T_JR).

An additional case temperature sensor protects the whole chip against overtemperature (OVC event): if the case temperature triggers the T_CSD threshold then overloaded channels are turned OFF and restart only when case temperature decreased down to the reset threshold (T_CR). Non overloaded channels continue to operate normally.

Other embedded functions are loss of ground protection, V_CC and V_DD UVLOs (with hysteresis), and watchdog.

An internal circuit provides an OR-wired not latched OVT that is reported on the common FAULT indicator pin. FAULT is an open drain, active low, fault indication pin.

The Synchronous Control Mode (by driving SYNC and LOAD pins independently) is used to reduce the jittering of the outputs and to drive at the same time the outputs of different devices.