LD6143 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

LD6143

Three Channel 4th Order Video Filter Driver

Unspecified 

LD6143

Three Channel 4th Order Video Filter Driver

Power Dissipation

The LD6143 output drive configuration must be considered when calculating overall power

dissipation. Care must be taken not to exceed the maximum die junction temperature. The

following example can be used to calculate the LD6143’s power dissipation and internal

temperature rise.

TJ =TA＋Pd×θJA

where: TA = Entironment Temperature, θJA = Thermal Resistance

Pd = PCH1＋PCH2＋PCH3 and PCHX = VCC×ICH －（VOUT 2 / RL）

where: VOUT = 2VIN＋0.280V

ICH =（ICC / 3）＋（VOUT / RL）

VIN = RMS value of input signal

ICC = Supply Current

VCC = Supply Voltage

RL = Channel load resistance

Board layout can also affect thermal characteristics. Refer to the Layout Considerations section

for more information.

The LD6143 is specified to operate with output currents typically less than 50mA, more than

sufficient for a dual (75Ω) video load. Internal amplifiers are current limited to a maximum of

100mA and should withstand brief duration short circuit conditions, however this capability is not

guaranteed.

Layout Consideration

General layout and supply bypassing play major roles in high frequency performance and

thermal characteristics. Following this layout configuration will provide the optimum performance

and thermal characteristics. For optimum results, follow the steps below as a basis for high

frequency layout:

• Include 1µF and 0.1µF ceramic bypass capacitors

• Place the 1µF capacitor within 0.75 inches of the power pin

• Place the 0.1µF capacitor within 0.1 inches of the power pin

• For multi-layer boards, use a large ground plane to help dissipate heat

• For 2 layer boards, use a ground plane that extends beyond the device by at least 0.5”

• Minimize all trace lengths to reduce series inductances

SWID Integrated Products, 5.F, Building B, Information & Technology Park, Economic & Technological 7

Development Zone, Chong qing, China.

Tel: (86 23)62836174

Fax: (86 23)62836149

E-mail: market@swid.com.cn

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