Datasheet > DI-92

DI-92

更新时间： 2024-09-17 03:29:39

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		驱动器
页数	文件大小	规格书
2页	540K
描述
0.5 W Non-Isolated Constant Current LED Driver

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

DI-92 数据手册

Design Idea DI-92

LinkSwitch^®-TN 0.5 W Non-Isolated

Constant Current LED Driver

Application

Device

Power Output

Input Voltage

Output Current

Topology

LED Driver

LNK302P

0.5 W

85-265 VAC

40 mA

Buck-Boost

Design Highlights

in this application, the device will switch and ramp up to the

current limit for each and every cycle.

• Extremely low component count – only 9 components

required

Since the peak current is limited and ﬁxed for each cycle, the

output power is solely determined by the size of the inductor.

It is recommended that this design operate in the discontinuous

conduction mode (DCM). Besides better EMI performance,

this also ensures that a low cost 75 ns reverse recovery diode

such as the UF4005 can be used. For designs that operate in

the continuous conduction mode (CCM), a more expensive

but faster diode (30 ns reverse recovery) like the BYV26C

may be required.

• Universal AC input range – single design worldwide

• Low cost, small size and very lightweight

• Replacement for passive capacitor or resistor droppers

• High efﬁciency (approximately 70% at 85 VAC)

• Meets EN55022 B EMI limits with >8 dB margin (see

Figure 2)

Operation

Figure 1 shows a simple buck-boost converter, operating in

open loop with no output feedback, being used as a constant

current LED driver. The circuit relies on the internal current

limiting function of the LNK302, which ensures constant

current is supplied to the load. Typical uses include night-

lights, neon sign replacements, emergency exit signs or any

application utilizing LEDs for lighting.

The output will be replenished every switching cycle (66 kHz),

and thus the need for the output ﬁlter capacitor is eliminated.

Persistenceofvisionofthehumaneye(typically10ms)ismuch

longer than the switching period, and it thus sees a consistent

light output without ﬂicker.

Select the value of L1 following the LinkSwitch-TN Design

Guide (www.powerint.com/appnotes.htm), or using the PI Xls

design spreadsheet (www.powerint.com/designsoftware.htm).

EntertheoutputvoltageasthevoltageoftheLEDstring,andthe

output current as the total combined LED current. Alternately,

one can calculate the inductance using

TheAC input is rectiﬁed and ﬁltered by D1, C1, C2, and RF2.

For safety, resistor RF1 should be a fusible ﬂameproof type,

whereas RF2 can be ﬂameproof only.

LinkSwitch-TN uses current limited ON/OFF control to

regulate the output current. This type of control inherently

rejects any input voltage variations over the entire operating

range. Current greater than 49 µA into the FEEDBACK pin

disables the MOSFET for that switching cycle. Since there

is never any current being fed back into the FEEDBACK pin

P_O= $ L $ I_LIMIT²$ f_S$ h

2 $ P_O

& L =

I_LIMIT²$ f_S$ h

LED 1-12

0.1 uF

50 V

UF4005

1N4007

RF2

47 Ω

13 mA per string

(average)

RF1

8.2 Ω, 1 W

Fusible

LinkSwitch-TN

LNK302P

2.2 uF

400 V

2.2 uF

400 V

1 mH

85-265

VAC

PI-4087-082605

Figure 1. A 0.5 W, 12.9 V, 40 mA Constant Current LED Driver, Using a Non-Isolated Buck-Boost Topology.

DI-92

September 2005

www.powerint.com

中文翻译

下载PDF

与DI-92相关器件

型号	品牌	获取价格	描述	数据表
DI-93	POWERINT	获取价格	General Purpose 32 W Continuous (81 W Peak) Supply
DI9400	DIODES	获取价格	Small Signal Field-Effect Transistor, 3.4A I(D), 30V, 1-Element, P-Channel, Silicon, Metal
DI9405	DIODES	获取价格	Small Signal Field-Effect Transistor, P-Channel, Metal-oxide Semiconductor FET, PLASTIC, S
DI9430	DIODES	获取价格	Small Signal Field-Effect Transistor, P-Channel, Metal-oxide Semiconductor FET, PLASTIC, S
DI9435	DIODES	获取价格	Small Signal Field-Effect Transistor, 5.3A I(D), 30V, 1-Element, P-Channel, Silicon, Metal
DI9945	DIODES	获取价格	Power Field-Effect Transistor, 3.5A I(D), 60V, 0.2ohm, 2-Element, N-Channel, Silicon, Meta
DI9953	DIODES	获取价格	Small Signal Field-Effect Transistor, P-Channel, Metal-oxide Semiconductor FET, PLASTIC, S
DI9956	DIODES	获取价格	Small Signal Field-Effect Transistor, N-Channel, Metal-oxide Semiconductor FET, PLASTIC, S
DIA01C7245A	ETC	获取价格
DIA01C7485A	ETC	获取价格	Monitoring Relays 1-Phase AC/DC Over Current

与DI-92相关文章

摩尔斯微电子在美国约书亚树国家公园测试 Wi-Fi HaLow
2024-09-18

18
贸泽上架Tallysman TW5386智能GNSS天线
2024-09-18

16
SL74HC10N：高性能三输入与非门解析
2024-09-03

93
AIC1781A 电池充电控制器深度解析
2024-09-03

83

产品中心

服务支持

精选活动

关于我们

帮助中心

DI-92

DI-92 数据手册

与DI-92相关器件

与DI-92相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

DI-92

DI-92 数据手册

与DI-92相关器件

与DI-92相关文章

您还可以找

您在本页遇到什么问题？