A6986I datasheet(40/62 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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Figure 44. Secondary winding positive peak current dependency on duty cycle (IOUT_sec = 100 mA)

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Duty cycle

Figure 45. Primary negative peak current dependency on duty cycle (VOUT_pri = 5 V, IOUT_pri = 0, IOUT_sec =

100 mA, N = 6, fSW = 500 kHz, L = 19 µH)

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1.5

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Duty cycle

Reverse current

limit already

triggered

typ. reverse current

limit threhsold

Windings resistance

Winding resistances should be minimized as much as possible since they affect the secondary output load

regulations. They also contribute to power losses, therefore affecting the efficiency of the total solution.

Leakage inductance

The leakage inductance of a transformer can be defined as an undesired inductive component due to the not

perfect magnetic linking of the two windings. Leakage inductance is inherent to the transformer construction and

can only be reduced but not eliminated.

A6986I

Design of the external components

DS13481 - Rev 2

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