SI8261AAC-C-IS Datasheet, PDF (14/40 Pages) Silicon Laboratories – 5 KV LED EMULATOR INPUT, 4.0 A ISOLATED GATE DRIVERS

Si826x
3. Functional Description
3.1. Theory of Operation
The Si826x is a functional upgrade for popular opto-isolated drivers, such as the Avago HPCL-3120, HPCL-0302,
Toshiba TLP350, and others. The operation of an Si826x channel is analogous to that of an opto coupler, except an
RF carrier is modulated instead of light. This simple architecture provides a robust isolated data path and requires
no special considerations or initialization at start-up. The Si826x also includes a noise filter that suppresses
propagation of any pulse narrower than 15 ns. A simplified block diagram for the Si826x is shown in Figure 9.
Transmitter
RF
OSCILLATOR
Receiver
V_DD
A
LED
Emulator
MODULATOR
Semiconductor-
Based Isolation
Barrier
DEMODULATOR
+
NOISE FILTER
B
0.6 to 4.0 A
peak
Gnd
Figure 9. Simplified Channel Diagram
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Rev. 1.3