SG6846A

更新时间： 2024-10-28 03:32:27

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
13页	484K
描述
Highly Integrated Green-Mode PWM Controller

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SG6846A 数据手册

Product Specification

Highly Integrated Green-Mode PWM Controller

SG6846A

consumption, a proprietary green-mode function provides

off-time modulation to continuously decrease the

switching frequency under light-load conditions. Under

zero-load conditions, the power supply enters burst-mode.

FEATURES

Two-level OCP with 1700ms delay time

Output short-circuited delay time: 100ms

Low start-up current (8µA)

The SG6846A is especially designed for SMPS with

surge-current output, incorporated with a two-level OCP

function. Besides the cycle-by-cycle current limiting, if

the switching current is higher than two thirds the

peak-current threshold for 1700ms, over-current

protection is activated and the SG6846A latches off.

Low operating current (3.7mA)

Peak-current mode operation with cycle-by-cycle

current limiting

Programmable PWM frequency with frequency

hopping

If the switching current is higher than two thirds the

peak-current threshold for 100ms and the voltage on the

VDD pin is higher than V_DD-OFF+ 1V, the PWM pulses

are latched off immediately once V_DDvoltage is lower

than V_DD-OFF+ 1V; useful if an output short-circuit occurs.

PWM frequency continuously decreasing with burst

mode at light loads

V_DDover-voltage protection (OVP)

AC input brownout protection with hysteresis and

constant output power limit

SG6846A also integrates a frequency hopping function

that reduces EMI emission of a power supply with

minimum line filters. Its built-in synchronized slope

compensation provides proprietary internal compensation

for constant output power limit over a universal AC input

range. Also, the gate output is clamped at 18V to protect

the external MOSFET from over-voltage damage.

Internal soft-start is built-in to reduce stress on the

MOSFET and start-up current during power-on period.

Constant output power limit (full AC input range)

Internal latch circuit for OVP, OTP, and OCP

Built-in soft-start

Open-loop protection with 1700ms delay time

APPLICATIONS

General-purpose switch-mode power supplies and

flyback power converters, including:

Other protection functions include: AC input brownout

protection with hysteresis, V_DDover-voltage protection,

and over-temperature protection. For over-temperature

protection, an external NTC thermistor can be applied to

sense the ambient temperature. When OCP, V_DDOVP, or

OTP are activated, an internal latch circuit is used to

latch-off the controller. The PWM pulses stay latched off

until the power supply is unplugged from the main outlet.

Power adapters

Open-frame SMPS

Specifically fit for SMPS with surge-current output

(such as for printers, scanners, motor drivers, etc.)

DESCRIPTION

The highly integrated SG6846A series of PWM

controllers provides features to enhance the performance

of flyback converters. To minimize standby power

SG6846A is available in an 8-pin SOP package.

TYPICAL APPLICATION

Version 1.1.1 (IAO33.0059.B1)

- 1 -

www.sg.com.tw • www.fairchildsemi.com

September 26, 2007

12 3 4 5 6 7...13

中文翻译

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与SG6846A相关器件

型号	品牌	获取价格	描述	数据表
SG6846A_08	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ACSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ACSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ALSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ALSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846B	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BCSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BCSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BLSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BLSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller

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