SG6846B

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
15页	445K
描述
Highly Integrated Green-Mode PWM Controller

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SG6846B 数据手册

October 2008

SG6846B

Highly Integrated Green-Mode PWM Controller

Features

Description

The highly integrated PWM controller, SG6846B,

provides several features to enhance the performance

of fly-back converters. To minimize standby power

Low Startup Current: 8µA

Low Operating Current: 3.7mA

consumption,

proprietary green-mode function

Peak-Current Mode Operation with Cycle-by-cycle

Current Limiting

provides off-time modulation to continuously decrease

the switching frequency under light-load conditions.

Under zero-load conditions, the power supply enters

burst-mode. This completely shuts off PWM output. If

V_FBis larger than around 1.6V, PWM pulses out. This

green-mode function enables power supplies to meet

international power conservation requirements.

PWM Frequency Continuously Decreasing with

Burst Mode at Light Loads

V_DDOver Voltage Protection (OVP)

AC Input Brownout Protection with Hysteresis

Constant Output Power Limit (Full AC Input Range)

The SG6846B is designed for SMPS with surge-current

output. It is incorporated with a two-level OCP function.

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

switching current is higher than OCP threshold and

lasts for 200ms, SG6846B stops gate immediately and

latches itself (BLSY version) or restarts after V_DD

charges up to 16.5V (BCSY version). SG6846B also

integrates frequency-hopping function internally. The

frequency hopping function helps reduce EMI emission

of a power supply with minimum line filters. It has built-

in synchronized slope compensation, proprietary

internal compensation for constant output power limit

over universal AC input range. The gate output is

clamped at 18V to protect the external MOSFET from

over-voltage damage.

Internal Latch Circuit for OVP, OTP, and OCP

(BLSY, BLSZ)

Two-level OCP Delay with 200ms

Programmable PWM Frequency with Frequency

Hopping

OCP Threshold is 2/3 Peak Current Limit

Soft Startup Time: 5ms

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Protection include: AC input brownout protection with

hysteresis and V_DDover-voltage 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 latch resets

when V_DDsupply is removed.

Power Adapters

Open-frame SMPS

SMPS with Surge-current Output, such as for

Printers, Scanners, Motor Drivers

SG6846B is available in 8-pin SOP package.

Ordering Information

Part

Number

Operating

Temperature Range Latch

OCP

Packing

Method

Eco

Status

Package

SG6846BLSY

SG6846BLSZ

SG6846BCSY

SG6846BCSZ

-40 to +105°C

Yes

Green

RoHS

Green

RoHS

8-Pin Small Outline Package (SOP) Tape & Reel

For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

SG6846B • Rev. 1.3.3

www.fairchildsemi.com

12 3 4 5 6 7...15

中文翻译

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与SG6846B相关器件

型号	品牌	获取价格	描述	数据表
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
SG6846C	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846CD	ETC	获取价格	Highly-Integrated Green-Mode PWM Controller
SG6846CDZ	ETC	获取价格	Highly-Integrated Green-Mode PWM Controller
SG6846CLDZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846CLSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846CS	ETC	获取价格	Highly-Integrated Green-Mode PWM Controller

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