GS40 Datasheet, PDF (10/11 Pages) Mean Well Enterprises Co., Ltd. – 40WAC-DC Single Output Desktop

ISL9016
With output voltage externally held up higher than the input
voltage:
1. Input is pulled to ground;
2. input is left open circuit; and
3. input is pulled to some intermediate voltage
ISL9016 provides the reverse current protection to limit the
current flow from output to input under these situations. When
input is pulled to ground and output is held to 5.5V, the typical
reverse current from output to input side is less than 8µA.
Input and Output Capacitors
The ISL9016 provides a linear regulator that has low
quiescent current, fast transient response, and overall stability
across the recommended operating conditions. A ceramic
capacitor (X5R or X7R) with a capacitance of 1µF to 4.7µF
with an ESR up to 200mΩ is suitable for ISL9016 to maintain
its output stability. The ground connection of the output
capacitor should be connected directly to the GND pin of the
device, and also placed close to the device. Similarly for the
input capacitor, usually a 1µF ceramic capacitor (X5R or X7R)
is suitable for most cases, but if large, fast rising-time load
transient condition is expected, a higher value input capacitor
may be necessary to achieve better performance.
Board Layout Recommendations
A good PCB layout will be an important step to achieve good
performance. It is recommended to design the board with
separate ground planes for input and output, and connect
both ground planes at the GND pin of the device.
Consideration should be taken when placing the
components and route the trace to minimize the ground
impedance, as well as keep the parasitic inductance low.
Usually the input/output capacitors should be placed close to
the device with good ground connection.
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FN6832.0
January 22, 2009