Datasheet > AP1201BHW6A

AP1201BHW6A

更新时间： 2022-12-01 21:25:26

品牌	Logo	应用领域
美台 - DIODES		光电二极管
页数	文件大小	规格书
9页	183K
描述
Power Management Circuit, PDSO6,

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AP1201BHW6A 数据手册

AP1201

Single-Channel Power Distribution Switch

ꢀ Function Description

Thermal Shutdown

Error Flag

When the chip temperature exceeds 140ºC for any

reason, the thermal shutdown function enables and

turns off MOSFET’s switch and signals the error

flag. A hysteresis of 10ºC prevents the MOSFETs

from turning back on until the chip temperature

drops to below 130ºC.

An open-drained output of an N-channel MOSFET,

the FLG output is pulled low to signal the following

fault conditions: input under-voltage, output current

limit, and thermal shutdown.

Current Limit

The current limit is set externally. It protects the

output MOSFET switches from damage due to

undesirable short circuit conditions or excess inrush

current often encountered during hot plug-in. The

low limit of the current limit threshold of the AP1201

allows a minimum current of 0.9A through the

MOSFET switches. A current limit condition will

signal the error flag. A resistor from SET to VIN

sets the current-Limit value.

Supply Filtering

A 0.1µF to 1µF bypass capacitor from IN to GND,

located near the device, is strongly recommended

to control supply transients. Without a bypass

capacitor, an output short may cause sufficient

ringing on the input (from supply lead inductance)

to damage internal control circuitry.

Transient Droop Requirements

USB supports dynamic attachment (hot plug-in) of

peripherals. A current surge is caused by the input

capacitance of downstream device. Ferrite beads

are recommended in series with all power and

ground connector pins. Ferrite beads reduce EMI

and limit the inrush current during hot-attachment

by filtering high-frequency signals.

I_LIM(MAX)~ 1.4X I_LIM(TYP)

I_LIM(MIN)~ 0.8X I_LIM(TYP)

AP1201 Rset

Current Limit Threshold (A)

R_SET(Ω)

Typical value

Short Circuit Transient

(Vout = 5V)

(Vout = 3.3V)

0.69

Bulk capacitance provides the short-term transient

current needed during a hot-attachment event. With

a 33µF, 16V tantalum or 100µF, 10V electrolytic

capacitor mounted close to downstream connector

per port should provide transient drop protection.

10K

20K

0.71

0.92

1.01

1.05

1.10

1.15

1.19

1.22

1.25

0.90

30K

1.00

40K

1.02

60K

1.08

80K

1.11

Printed Circuit Layout

100K

200K

floating

1.16

The power circuitry of USB printed circuit boards

requires a customized layout to maximize thermal

dissipation and to minimize voltage drop and EMI.

1.20

1.23

Anachip Corp.

www.anachip.com.tw

Rev.0.4 Jan 28, 2004

5/9

1 2 3 456 7 8 9

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