TS4990 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS4990' PDF : 33 Pages View PDF
TS4990
Application information
The graph in Figure 60 shows an example of Cin and Cfeed influence.
Figure 60. Frequency response gain vs. Cin and Cfeed
10
5
0
-5
-10
-15
-20
-25
10
Cfeed = 330pF
Cfeed = 680pF
Cin = 470nF Cfeed = 2.2nF
Cin = 22nF
Cin = 82nF
Rin = Rfeed = 22kΩ
Tamb = 25°C
100
1000
Frequency (Hz)
10000
4.4
Power dissipation and efficiency
Hypotheses:
● Load voltage and current are sinusoidal (Vout and Iout).
● Supply voltage is a pure DC source (VCC).
The load can be expressed as:
Vout = VPEAK sinωt (V)
and
Iout
=
V-----o---u---t -
RL
(A)
and
Pout
=
V-----P----E----A----K------2-
2RL
(W)
Therefore, the average current delivered by the supply voltage is:
ICCAVG
=
2 V-----P----E----A----K----
πRL
(A)
The power delivered by the supply voltage is:
Psupply = VCC ⋅ ICCAVG
(W)
19/32
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