tp2150b Tripath Technology Inc., tp2150b Datasheet - Page 15
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tp2150b
Manufacturer Part Number
tp2150b
Description
Dual High Side And Low Side Mosfet Driver
Manufacturer
Tripath Technology Inc.
Datasheet
1.TP2150B.pdf
(18 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TP2150B
Manufacturer:
TRIPATH
Quantity:
20 000
T r i p a t h T e c h n o l o g y , I n c . - T e c h n i c a l I n f o r m a t i o n
Output Filter Design
One advantage of Tripath amplifiers over PWM solutions is the ability to use higher-cutoff-
frequency filters. This means load-dependent peaking/droop in the 20kHz audio band potentially
caused by the filter can be made negligible. This is especially important for applications where the
user may select a 6-Ohm or 8-Ohm speaker. Furthermore, speakers are not purely resistive loads
and the impedance they present changes over frequency and from speaker model to speaker
model.
Tripath recommends designing the filter as a 2nd order, 100kHz LC filter. Tripath has obtained
good results with L
= 11uH and C
= 0.15uF for 6: and 8: loads and L
= 18uH and C
= 0.22uF
F
F
F
F
for 4: loads.
The core material of the output filter inductor has an effect on the distortion levels produced by a
TP2150B amplifier. Tripath recommends low-mu type-2 iron powder cores because of their low
loss and high linearity (available from Micrometals, www.micrometals.com).
Tripath also recommends that an RC damper be used after the LC low-pass filter. No-load
operation of a TP2150B amplifier can create significant peaking in the LC filter, which produces
strong resonant currents that can overheat the output MOSFETs and/or other components. The
RC dampens the peaking and prevents problems. Tripath has obtained good results with R
=
Z
20: and C
= 0.15uF for 6: and 8: loads and R
= 15: and C
= 0.22uF for 4: loads.
Z
Z
Z
15
TP2150B - MC/ 1.7/06.04