TPS65552A Datasheet

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TPS65552A

SLVS567 鈥?JULY 2005

Figure 8

shows key points when designing a PCB.

1. In many DSC designs, parasitic resistance that cannot be ignored, exists on the power line path from the

battery to the primary side turn of the transformer. The TPS65552A has one ground point connection inside

the IC at the PGND PAD. So, the PCB layout should also keep a one-point ground connection at the PGND

terminal of TPS65552A.

2. The loop indicated by dotted-lines is laid out as small as possible to reduce the open area of the loop.

3. The TPS65552A uses the VCC input as a reference voltage. Considering Note 1, the ground of the

power

unit

that sources VCC is connected to PGND.

4. Regarding Note 3, the bypass capacitor, C2, is required to avoid grounding noise.

Additional Technical Information

TI provides an application note for this device. For more technical information, please find the application note on

the TI Web site or consult your sales contact. Literature number

SLVA197.

The application note provides the following information.

1. Recommended external parts

2. PCB layout

3. Detailed operation theory

4. Calculation of the efficiency

5. Key points to design your system

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