A6986I datasheet(18/62 Pages) STMICROELECTRONICS

Part #	A6986I

Description	Automotive 38 V, 5 W synchronous iso-buck converter for isolated applications

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Secondary output line regulation

The secondary output line regulation is defined, similarly to the primary side, as the variation of the secondary

output voltage due to the input voltage change at a specific current. The secondary output line regulation is mainly

affected by the transformer and in particular by its leakage inductance.

Keeping constant the leakage inductance (i.e. using the same transformer), a higher input voltage allows to

slightly increase the isolated output voltage, as shown in Figure 16.

Figure 17. Secondary output line regulation

VIN [V]

The input voltage value influences the peak current in the secondary winding (see Figure 17), hence determining

the amount of energy delivered to the secondary output and in turn the isolated output voltage value.

Figure 18. Secondary winding current at different input voltages

A6986I

Output voltage line regulation

DS13481 - Rev 2

page 18/62

A6986I Datasheet(PDF) 18 Page - STMicroelectronics