Copyright

© ANPEC Electronics Corp.

Rev. A.3 - Jun., 2011

www.anpec.com.tw

13

APL3205A/B

Function Description (Cont.)

Figure3. OVP Timing Chart

T

B(IN)

V

IN

V

OUT

T

ON(OVP)

V

OVP

V

POR

V

FAULT

Powering an Accessory Device

In some applications, such as USB On-The-Go, users need to power an accessory device by using the portable

device’s battery through the jack holes of AC adapter. The APL3205 provide reverse current flow path from OUT to IN.

If V

will then remain ON as long as V

capability is the same as the forward capability, 1.5A. It should be noted that there is no overcurrent protection in this

direction.

APL3205

Charger

Battery

Accessory

Power Supply

to system

Enable

Disable

Jack

Accessory

Device

Portable

Device

IN

OUT

Gate

Driver and

Logic

Control

Q1