|
|
Isolated Power Interfaces
IsoLoop Isolators are the ideal alternative to optocouplers for Isolated
Power Interfaces. Current-drive inputs replace LED inputs. Open-drain
outputs replace open-collector phototransistors. Unlike optocouplers,
however, IsoLoop Isolators have unlimited life with no degradation. IsoLoop
Isolators reduce board space with up to two channels per MSOP.
Illustrative circuits:
 Application Bulletin: IsoLoop Isolators for High-Efficiency Power Control (.pdf)
IL600-Series Passive-Input Isolator data sheet (.pdf)
IL600A-Series Open-Drain Isolator data sheet (.pdf)
|
Intelligent DC-DC Converter With Synchronous Rectification
A typical primary-side controller uses a IL511, IL611, or
IL711 isolator to drive the synchronous rectification signals from primary
side to secondary side. IsoLoop pulse-width distortion as low as 0.3 ns
typical minimizes MOSFET dead time and maximizes system efficiency. Ultra-small
isolator packages (including two-channel MSOP-8s), allow the designer to
squeeze more into less board area.
Back to top
Isolated Power Control Using IL610s
The fail-safe output (logic high output for zero coil current) of IL600 Isolators ensures the power FETs will be off on power-up. The IL600
inputs can be configured for inverting or non-inverting operation (see
IL600 Product Data Sheet). The IL600 Isolators provide 2.5 kVrms
isolation (1 minute), and 20 kV/µs transient immunity.
Back to top
Isolated 120 V AC Line Monitor Using IL610A
The wide input voltage range of IL600 Isolators allow connection to line
voltage through current-limiting resistors. In this illustrative circuit,
"Monitor Out" goes low when line voltage exceeds approximately 100 V, and high when line voltage drops below approximately 10 V. This circuit
provides 2.5 kVrms isolation and 20 kV/µs transient immunity.
Back to top
Multi-Channel Isolated Alarm Monitor Using IL610As
IL600A Isolators’ open-drain outputs can be wire-OR connected. A very wide
input voltage range is possible, and inputs can be configured for inverting
or non-inverting operation (see IL600A Product
Data Sheet). This illustrative circuit provides fail-safe output (logic
high output for zero coil current), 2.5 kVrms isolation, and 20 kV/µs
transient immunity. Typical logic output sink current is 10 mA for each
isolator. Unlike optocouplers, IsoLoop Isolators do not degrade over time
and have unlimited life.
Back to top
|
