7708 datasheet(20/42 Pages) POWERINT

20 / 42 page

Rev. B 04/15

TFS7701-7708

www.power.com

Figure 23. LINE-SENSE and RESET Pin Resistor Chain. The Highlighted Resistors

Should be SMD Type and Placed as Close as Possible to Their

Respective Pins.

and through-hole for the others), their values should be

proportional to their voltage ratings (while maintaining the correct

total series value).

The last resistor in the series chain, should be connected to the

LINE-SENSE and RESET pins, (R35 and R36 in Figure 23) must

be SMD type and placed very close to their associated pins.

The traces that feed these pins, and the additional series

resistors, should not be placed close to any high dv/dt traces

and areas with high-voltage switching. Noise on these pins

may cause distortion of the various functions determined by the

LINE-SENSE and RESET pins, such as LINE-SENSE pin UVLO,

and LINSE-SENSE and RESET pin duty cycle limiting. For

optimal performance, the LINSE-SENSE and RESET pins are

located in between the BYPASS and GROUND pins which have

DC voltages, so that the traces connecting to the DC voltages

can act as Faraday shields for the traces connected to the

LINSE-SENSE and RESET pins. See Figure 24.

Feedback and Enable Pins

The FEEDBACK and ENABLE pins should likewise be kept

away from noisy, high-voltage switching areas. If it is unavoidable

to have long traces connecting to FEEDBACK pins, then route

these traces parallel to and close to, quiet, low impedance

traces that act as Faraday shields, such as V

AUX or BP.

HiperTFS-2

PI-7021-060313

R12

1.33 M

Ω

R12

100

Ω

1/2 W

R13

1.33 M

Ω

R35

1.33 M

Ω

R18

1.33 M

Ω

2.2 nF

1 kV

R19

1.33 M

Ω

Place These Components

as Close as Possible to the

LINE-SENSE and RESET Pins

R36

1.33 M

Ω

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