S-8533A14AFT-TB-G 参数 Datasheet PDF下载

STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER

Rev.2.3

_00

S-8533 Series

Though the conditions mentioned above are required to prevent back-flow current, they are guidelines. Check the

validity by measuring the prototype or the actual device.

Back-flow current

L

Coil

current I

L

V

OUT

V

IN

C

IN

+

VIN PDRV

NDRV

VSS

+

Figure 9 Back-Flow Current

Coil current under no load

I

L

218 mA

I

L

max.

ΔI

L

Back-flow

current

Coil current when 109 mA

flows as a load

I

L

max.

ΔI

L

I

L

min.

Back-flow current = 0 mA

I

L

109 mA

0 mA

I

OUT

−109

mA

109 mA

I

OUT

0 mA

I

L

min.

Figure 10 Example for No Back-Flow Current

10

Seiko Instruments Inc.