AP3776B datasheet(13/17 Pages) DIODES

tên linh kiện	AP3776B

Giải thích chi tiết về linh kiện	LOW POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

PDF	17 Pages

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nhà sản xuất	DIODES [Diodes Incorporated]

Trang chủ	http://www.diodes.com

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13 / 17 page

AP3776B

Document number: DS36737 Rev. 6 - 2

13 of 17

www.diodes.com

December 2015

AP3776B

Function Description (Cont.)

VTH(ST)

VFB(SCP)

tOFF(MAX)

VCC

VFB

VOUT

VOUT(SCP)

Figure 6. Normal Start-up

VTH(ST)

VOPR(MIN)

VFB(SCP)

tOFF(MAX)

VCC

VFB

VOUT

Figure 7. Short Circuit Protection (SCP) and Hiccup Mode

RCS Short Protection

When the primary side current sense resistance is shorted, the primary side current rapidly increases, and the transformer saturates, which leads

some components’ damage. The AP3776B draws in the RCS short protection to avoid the damage. If the voltage of CS pin is smaller than 0.15V

at the primary side maximum on time tonp(MAX), the RCS short protection is triggered, and the AP3776B immediately shuts down, and then

restarts.

Over Temperature Protection (OTP)

When the IC junction temperature exceeds the thermal shutdown temperature threshold of +130ºC, the device shuts down immediately. Retry is

allowed if junction temperature reduces by hysteresis temperature value.

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