AN10907
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Application note
Rev. 1 — 28 December 2010
46 of 82
NXP Semiconductors
AN10907
TEA1613T resonant power supply control IC
8.7.4 Current measurement circuits
8.7.5 SNSCURHBC layout
Because the SNSCURHBC must be able to accurately sense the measurement signal
cycle-by-cycle at higher frequencies, it is susceptible to disturbances. To prevent
disturbances on this input, the series resistor Rcc should be placed close to the IC to
reduce the length of the track that can pick up disturbing signals. As the impedance of the
measurement resistor is normally low, the length of signal track between Rcc and the
measurement resistor is not critical regarding disturbance.
Fig 31. SNSCURHBC: resonant current measurement configurations
001aal455
V
BOOST
SNSCURHBC
I
res
Rcc
Rm
1 k
Ω
V
BOOST
SNSCURHBC
I
res
0.02 I
res
Rcc
C = 1 nF
C = 49 nF
Rm
1 k
Ω
