Datasheet > DI-138

DI-138

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
2页	160K
描述
1.2 W, Non-isolated Dual Output Supply for White Goods

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

DI-138 数据手册

Design Idea DI-138

LinkSwitch^®-TN

1.2 W, Non-isolated Dual Output Supply for White Goods

Application

Device

Power Output

Input Voltage

Output Voltage

Topology

White Goods

LNK304DN

1.2 W

85-265 VAC

+7 V, -5 V

Buck Derived

Design Highlights

Resistor RF1 is a fusible ﬂame-proof type that acts as a fuse

in the event of a catastrophic failure. Diode D1 providesAC

input rectiﬁcation while C1 and C2 provide smoothing and,

together with L1, act as a π ﬁlter. This ﬁltering, together with

LinkSwitch-TN’s (U1) integrated switching frequency jitter,

provides a generous EMI margin (see Figure 3).

• Universal input

• Excellent regulation – 12 V ±8% and 5 V ±5%

(line, load, and tolerance)

• Temperature compensated

• Low stand-by input power consumption:

<300 mW at 230 VAC with 50 mW output load

• Meets CISPR-22/EN55022B limits for conducted

EMI with >10 dB margin

Duringeachenabledswitchingcycle,U1’sinternalMOSFET

is enabled, causing a linear ramp in current through L2 and

C5. Once the internal current limit is reached, the MOSFET

turns off, and the inductor current can freewheel via D2,

C5, and C6.

Operation

The circuit shown below provides two outputs, –5 V and

+7 V. Referencing the load to the –5 V output creates a 5 V

and 12 V output, the 5 V driving the control electronics and

the 12 V output the mechanical relays.

Regulation is maintained by adjusting the ratio of enabled to

disabled cycles. A cycle is skipped once the current into the

FEEDBACK (FB) pin exceeds 49 μA. As this is speciﬁed

at a voltage of 1.65 V, it allows this pin to can be used as a

reference. With the values of R1 and R2 as shown, this sets

the voltage across C5 plus C6 to 12 V.

This is ideal in applications where a negative gate drive is

required for controlling a triac. As the triac gate is referenced

to the RTN/N line when the control electronics are referenced

to the –5 V output (V_EE), the gate can be driven with a 0 V to

–5 V signal (w.r.t. RTN/N).

The –5Voutput is regulated by Q2 usingVR1 as a reference.

Zener VR1 is biased with a ﬁxed current of approximately 2

mA, set by R3, to reduce the voltage variation of VR1 and

therefore of the –5 V output over load changes. Resistor R4

12.4 k7

10 MF

DL4007

100 nF

50 V

2 k7

RF1

8.2 7

2.5 W

1000 MH

1500 MH

DL4007

+7 V, 80 mA

3.3 k7

LinkSwitch-TN

20 7

100 MF

16 V

4.7 MF

400 V

3.3 k7

LNK304DN

4.7 MF

MURS160T3G

MMBT3904

400 V

RTN

5.1 k7

100 MF

16 V

VR1

MAZS0510M

-5 V, 50 mA

PI-4633-040507

Figure 1. LinkSwitch-TN 1.2 W Dual Output Supply.

April 2007

DI-138

下载PDF

与DI-138相关器件

型号	品牌	描述	获取价格	数据表
DI150	PANJIT	DUAL-IN-LINE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIER(VOLTAGE - 50 to 1000 Volts CUR	获取价格
DI150	TRSYS	DUAL-IN-LINE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIER	获取价格
DI150_07	PANJIT	DUAL-IN-LINE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIER	获取价格
DI150S	PANJIT	SURFACE MOUNT GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIER	获取价格
DI150S_10	PANJIT	SURFACE MOUNT GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIER	获取价格
DI150S_15	PANJIT	SURFACE MOUNT GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIER	获取价格