ZSLS7031 Datasheet

© 2016 Integrated Device Technology, Inc.

13

January 26, 2016

Figure 2.5

Under-Voltage Lock Out

3

Application Circuit Design

3.1

Typical Applications

The typical application circuits shown on the following pages are designed for a wide input voltage range 85VAC

to 265VAC.

3.2

Line Regulation Compensation Design

The output power of the ZSLS7031 varies slightly with input voltage due to the small delay associated with the

current-sense control loop. At high input voltages, the slope of the input current is quite steep, and therefore it will

overshoot the target value by more than it would at low input voltage conditions. Therefore, under wide input

voltage conditions, and without additional compensation, the output power varies over the full input voltage range,

85VAC to 265VAC, by about +/-5%. To further improve the line regulation, a simple compensation circuit can be

added as shown in Figure 3.1 and Figure 3.2 with components R4, R12, R13, R14, R15, and C9.

3.3

Transformer Design

The transformer design is described in a separate application note ZSLS7031_AN_TransformerDesign.pdf sup-

ported by a calculation spreadsheet.