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| 型号： | P87C380 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc(带DDC接口，同步监测和同步处理的监视器微控制器) |
| 中文描述： | 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42 |
| 文件页数： | 35/84页 |
| 文件大小： | 420K |
| 代理商： | P87C380 |
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1997 Dec 12
35
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
14.3
A typical PWM output application
A typical PWM application is shown in Fig.19. The buffer is
optionally used to reduce the influence from supply/ground
bouncing to another circuit. R1 and C1 form the integration
network, the time constant of which should be equal to or
greater than 5 times 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).
R3
------------------------------------
=
(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
(pin 12) with the return leads
of other sensitive signals.
V
max
V
R1
R3
R2
R2
×
+
R1
+
V
min
R1
R3
R3
R1
×
+
R1
V
DD
R3
R3
×
R2
×
+
R1
+
=
Fig.19 Typical PWM output circuit.
andbook, halfpage
MGG048
C1
R3
R1
R2
DEVICE
TYPE NR.
(1)
PWMn
VSS
supply
voltage
analog
output
(1) P83Cx80; P87C380
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