MAX20047AFPASLASHV+ datasheet(17/29 Pages) MAXIM

tên linh kiện	MAX20047AFPA/V+

Giải thích chi tiết về linh kiện	Dual 3A USB DCP Charger

PDF	29 Pages

Scroll/Zoom	100%

nhà sản xuất	MAXIM [Maxim Integrated Products]

Trang chủ	https://www.maximintegrated.com/en.html

Logo

17 / 29 page

VBUS Short-to-Battery Protection

The OV_USB threshold for both VBUS channels is continu-

ally monitored, and if the voltage on either VBUS channel

exceeds 5.8V, the G_DMOS pin is immediately driven low,

disabling the external DMOS MOSFETs. To ensure that

the external MOSFETs are instantaneously turned off, an

internal 5Ω discharge FET is also enabled, bleeding off any

remaining gate charge. After 2s, the G_DMOS pin is driven

high, enabling the external MOSFETs, with the OV_USB

threshold again tested. If the OV_USB threshold is no

longer tripped, power to both VBUS channels is restored;

otherwise, the IC retries every 2s while the fault persists.

Figure 2 illustrates the process.

Figure 2. HVBUS2 Short-to-Battery

OVER-VOLTAGE

APPLIED

OVER-VOLTAGE

REMOVED

OVER-VOLTAGE

REMOVED

FAULT RECOVERY

COMPLETE

5.2V

VHVBUS1

14.0V

5.8V

5.2V

VHVBUS2

VG_DMOS

VSRC_DMOS1

VSRC_DMOS2

2 seconds

5.7V

2 seconds

5.2V

MAX20047

Dual 3A USB DCP Charger

www.maximintegrated.com

Maxim Integrated │ 17

MAX20047AFPA/V+ bảng dữ liệu(PDF) 17 Page - Maxim Integrated Products