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PCA9620 데이터시트(PDF) 34 Page - NXP Semiconductors

부품명 PCA9620
상세설명  Universal LCD driver for low multiplex rates
PDF  71 Pages
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제조업체  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9620 데이터시트(HTML) 34 Page - NXP Semiconductors

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PCA9620
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 1 — 9 December 2010
34 of 71
NXP Semiconductors
PCA9620
Universal LCD driver for low multiplex rates
(9)
The ratio between these two numbers determines the charge pump power efficiency:
(10)
Loading the charge pump with higher currents decreases the output voltage. This
decrease is determined by the charge pump driving capability, respectively by the output
resistance of the charge pump (see Table 35 on page 55).
The power efficiency calculation is only valid when the charge pump is running at its
maximum peak frequency and regulates the generated VLCD voltage with full speed. In
this case, the ripple on the VLCD voltage equals the internal charge pump frequency.
Approximately, this could also be calculated with the parameter of the output resistance of
the charge pump (see Table 35 on page 55), the load current, and the voltage needed to
be provided by using Equation 7 on page 33. This value of Iload is close to the value of the
load current needed for the application.
If the application runs with VDD2 = 3.0 V, the load currents are up to 400 μA
(DC measured), and the VLCD generated voltages are up to 5.0 V, then - concerning
power efficiency - it would be the best to have a charge pump frequency set to half
frequency.
Charge pump set to 2
× V
DD2; VDD2 =3V.
(1)
η
p, full charge pump frequency.
(2)
η
p, half charge pump frequency.
(3) VLCD, full frequency.
(4) VLCD, half frequency.
Fig 26. Power efficiency of the charge pump
P
i
I
DD2
V
DD2
×
=
η
p
P
o Pi
⁄
=
Iload (μA)
0
1000
800
400
600
200
001aan027
50
70
90
ηp
(%)
30
3
5
7
VLCD
(V)
1
(3)
(4)
(1)
(2)



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