Datasheet > US1651

US1651

更新时间： 2024-02-17 22:10:47

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
7页	178K
描述
PRIMARY-SIDE REGULATION PWM POWER SWITCH

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US1651 数据手册

UNISONIC TECHNOLOGIES CO., LTD

US1651

Preliminary

CMOS IC

PRIMARY-SIDE REGULATION

PWM POWER SWITCH



DESCRIPTION

The UTC US1651 is a primary control switch mode charger and

adapter applications. The controlled variable is transferred by an

auxiliary winding from the secondary to the primary side. The

device integrates PWM controller to enhance the performance of

discontinuous conduction mode (DCM) flyback converters.

The UTC US1651 operates in primary-side sensing and

regulation. Opto-coupler and TL431 could be eliminated. It

operates in fixed frequency mode at large load conditions,

frequency reduction mode at light/medium load and ‘Extended

burst mode’ at No/light load conditions. So that low standby power

can be achieved.

SOP-8

The UTC US1651 achieves high precision CV/CC regulation

and high power efficiency. It offers comprehensive protection

coverage with auto-recovery features including Cycle-by-cycle

current limiting, V_DDover voltage protection, V_DDclamp, OTP,

leading edge blanking, V_DDunder voltage lockout, etc.

 FEATURES

* Programmable CV and CC regulation

* Primary-side sensing and regulation with No TL431 and

opto-coupler

* Multi-mode operation for high efficiency

* Adjustable constant current and output power setting

* Power on soft-start time (4ms)

* ”Extended burst mode control” for improved efficiency

and minimum standby design

* Built-in leading edge blanking (LEB)

* V_DDunder voltage lockout

* V_DDover voltage shutdown and clamp

* Cycle-by-Cycle current limiting

* Frequency shuffling and adjustable gate drive greatly

improving EMI

* Fail-safe protection for open loop fault condition

* Auto-restart in over voltage condition



ORDERING INFORMATION

Ordering Number

US1651G-S08-R

Package

SOP-8

Packing

Tape Reel

www.unisonic.com.tw

1 of 7

QW-R129-005.a

12 3 4 5 6 7

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