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參數(shù)資料
| 型號： | PCE84C487 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for digital auto-sync and VST TV controller applications |
| 中文描述： | 微控制器的數(shù)字自動同步和VST電視控制器的應用 |
| 文件頁數(shù)： | 16/36頁 |
| 文件大小： | 168K |
| 代理商： | PCE84C487 |
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1996 Feb 21
16
Philips Semiconductors
Objective specification
Microcontrollers for digital auto-sync and
VST TV controller applications
PCE84C486; PCE84C487
Fig.13 Fine adjustment output (OUT2).
handbook, full pagewidth
MLC755
tsub0
tsub16
tsub32
tsub48
tsub64
tsub80
tsub96
tsub112
tsub127
tr
111 1110
111 1011
111 1010
PWM8L
7.4
A typical PWM output application
A typical PWM application is shown in Fig.14. R1 and C1
form an integration network the time constant of which
should be at least 5 times greater than the repetition period
of the PWM output pattern. In order to smooth a changing
PWM output a high value of C1 should be chosen. The
value of C1 will normally be in the range 1 to 10
μ
F. The
potential divider chain formed by R2 and R3 is used only
when the output voltage is to be offset. The output voltages
for this application are calculated using
Equations (1) and (2).
supply voltage
×
R2
×
R1
R2
+
(1)
(2)
The loop from the PWM pin through R1 and C1 to V
SS
will
radiate high frequency energy pulses. In order to limit the
effect of this unwanted radiation source, the loop should
be kept short and a high value of R1 selected. The value
of R1 will normally be in the range 3.3 to 100 k
. It is good
practice to avoid sharing V
SS
with the return leads of other
sensitive signals.
V
max
R3
R1
+
R3
=
V
min
R1
R3
R3
×
+
R1
supply voltage
×
R2
R3
R3
×
+
R1
+
=
Fig.14 Typical PWM output circuit.
handbook, halfpage
MGD136
C1
R3
R1
R2
PCE84C48X
PWMn
VSS
supply
voltage
analog
output
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