Rev. B 04/15

21

TFS7701-7708

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Figure 24. LINE-SENSE and RESET Pin Resistor Layout. The 2 Resistors Connected to LINSE-SENSE and RESET Pins Should be SMD, and the GROUND and BYPASS

Pin Traces Provide Faraday Shielding Against the HIGH-SIDE SOURCE and MAIN-DRAIN Pin Traces. The Bypass Capacitor is Through-Hole Type so that the

Traces Connecting to the Pins can be Very Short.

Figure 25. Layout Around ENABLE and FEEDBACK Pin. Use Quiet Traces as Faraday Shields from Noisy Traces, Especially if the Traces to the Optocouplers are Long.

Transformer Secondary and Output Diodes

Flyback Layout

The diode and output capacitor should be mounted close to the

secondary winding and routed with short traces. The standby

PI-7012-052113

GROUND

Pin

RESET

Pin

LINE-SENSE

Pin

BYPASS

Pin

LINE-SENSE AND

RESET Pin Resistors

(SMD)

High-Side Source

Trace (Noisy)

GROUND Pin

Trace Acting

as Shield

MAIN DRAIN

Pin (Noisy)

Bypass

Capacitor

BYPASS Pin

Trace Acting

as Shield

PI-7022-052113

DSB

(Noisy)

Ground

(Shield)

ENABLE

Pin

High-Side

Drain (Quiet)

VAUX

(Quiet)

VDDH Parts

(Noisy)

Bootsrap Diode

Placed Near VDDH

High-Side

Source (Noisy)

FEEDBACK

Pin

primary bias (V

AUX ) capacitor and diode should be mounted

close to the winding.