Datasheet > LNK353

LNK353

更新时间： 2024-01-17 11:26:02

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		开关
页数	文件大小	规格书
16页	856K
描述
Enhanced, Energy Efficient, Low Power Off-Line Switcher IC

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技术参数
数据手册

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LNK353 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP,	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.65
其他特性：	REQUIRES AN AC SUPPLY OF 85 TO 265V	模拟集成电路 - 其他类型：	SWITCHING REGULATOR
控制技术：	PULSE WIDTH MODULATION	JESD-30 代码：	R-PDIP-T7
JESD-609代码：	e0	长度：	9.575 mm
功能数量：	1	端子数量：	7
最高工作温度：	125 °C	最低工作温度：	-40 °C
最大输出电流：	0.4 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	表面贴装：	NO
切换器配置：	SINGLE	最大切换频率：	214 kHz
温度等级：	AUTOMOTIVE	端子面层：	TIN LEAD
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.62 mm	Base Number Matches：	1

LNK353 数据手册

LNK353/354

CY1

100 pF

SS14

5.7 V,

400 mA

EE16

J3-2

2.2 nF

400 V

68 Ω

100 kΩ

6.8 Ω

220 Ω

330 µF

16 V

1N4005 1N4005

RTN

J3-1

2.2 nF

200 Ω

RF1

8.2 Ω

2.5 W

NC NC

1N4007GP

MMST

3906

4.7 µF

400 V

VR1

BZX79B5V1

5.1 V, 2%

85-265

VAC

4.7 µF

400 V

390 Ω

5.1 kΩ

200 Ω

LinkSwitch-HF

LNK354P

1N4005 1N4005

U2B

U2A

R10

2.4 Ω

1 W

PC817D PC817D

100 nF

1 mH

PI-3891-070204

Figure 5. Universal Input, 5.7 V, 400 mA, Constant Voltage, Constant Current Battery Charger Using LinkSwitch-HF.

Output rectiﬁcation is provided by Schottky diode D6. The low

forward voltage provides high efﬁciency across the operating

range and the low ESR capacitor C6 minimizes output voltage

ripple.

Applications Example

A 2.4 W CC/CV Charger Adapter

The circuit shown in Figure 5 is a typical implementation of

a 5.7 V, 400 mA, constant voltage, constant current (CV/CC)

battery charger.

In constant voltage (CV) mode, the output voltage is set by the

ZenerdiodeVR1andtheemitter-basevoltageofPNPtransistor

Q1. The V_BEof Q1 divided by the value of R7 sets the bias

current through VR1 (~2.7 mA). When the output voltage

exceeds the threshold voltage determined by Q1 and VR1, Q1

is turned on and current ﬂows through the LED of U2. As the

LED current increases, the current fed into the FEEDBACK

pin increases, disabling further switching cycles of U1. At

very light loads, almost all switching cycles will be disabled,

giving a low effective switching frequency and providing low

no-load consumption.

The input bridge formed by diodes D1-D4, rectiﬁes the AC

input voltage. The rectiﬁed AC is then ﬁltered by the bulk

storage capacitors C1 and C2. Resistor RF1 is a ﬂameproof,

fusible, wire wound type and functions as a fuse, inrush current

limiter and, together with the π ﬁlter formed by C1, C2 and L1,

differential mode noise attenuator.

This simple EMI ﬁltering, together with the frequency jittering

of LinkSwitch-HF (U1), a small value Y1 capacitor (CY1),

and shield windings within T1, and a secondary-side RC

snubber (R5, C5), allows the design to meet both conducted

and radiated EMI limits. The low value of CY1 is important

to meet the requirement of low line frequency leakage current,

in this case <10 µA.

Duringloadtransients,R6andR8ensurethattheratingsofQ1are

not exceeded while R4 prevents C4 from being discharged.

Resistors R9 and R10 form the constant current (CC) sense

circuit. Above approximately 400 mA, the voltage across the

senseresistorexceedstheoptocouplerdiodeforwardconduction

voltage of approximately 1 V. The current through the LED

is therefore determined by the output current and CC control

dominatesovertheCVfeedbackloop.CCcontrolismaintained

even under output short circuit conditions.

The rectiﬁed and ﬁltered input voltage is applied to the primary

winding of T1. The other side of the transformer primary is

driven by the integrated MOSFET in U1. Diode D5, C3, R1

and R3 form the primary clamp network. This limits the peak

drain voltage due to leakage inductance. Resistor R3 allows the

use of a slow, low cost rectiﬁer diode by limiting the reverse

current through D5 when U1 turns on. The selection of a slow

diode improves efﬁciency and conducted EMI.

2/05

1 2 345 6 7...16

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