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MC1455, MC1455B, NCV1455B
http://onsemi.com
8
Pulse Width Modulation
If the timer is triggered with a continuous pulse train in the
monostable mode of operation, the charge time of the
capacitor can be varied by changing the control voltage at
Pin 5. In this manner, the output pulse width can be
modulated by applying a modulating signal that controls the
threshold voltage.
Figure 24. Pulse Width Modulator
+VCC (5.0 V to 15 V)
RL
Output
Clock
Input
Modulation
Input
C
7
6
5
RA
48
3
2
1
MC1455
t = 0.5 ms/cm
(RA = 10 kW, C = 0.02 mF, VCC = 15 V)
Figure 25. Pulse Width Modulation Waveforms
Test Sequences
Several timers can be connected to drive each other for
sequential timing. An example is shown in Figure 26 where
the sequence is started by triggering the first timer which
runs for 10 ms. The output then switches low momentarily
and starts the second timer which runs for 50 ms and so forth.
Figure 26. Sequential Timer
Load
MC1455
6
7
2
84
5
3
27 k
1
5.0
mF
Load
MC1455
9.1 k
6
7
1.0
mF
2
84
5
3
0.01
mF
27 k
1
0.001
mF
5.0
mF
MC1455
6
7
2
84
5
3
1
Load
0.001
mF
18.2 k
9.1 k
0.01
mF
0.01
mF
VCC (5.0 V to 15 V)
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|---|---|
| NCV1455BDR2G | 功能描述:計時器和支持產(chǎn)品 567 Timer Commercial Temp RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| NCV2001 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:0.9 V, Rail−to−Rail, Single Operational Amplifier |
| NCV2001SN2T1G | 功能描述:運算放大器 - 運放 SNGL OPERATIONAL AMP 0.9V RAIL TO RAIL RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| NCV2001SQ2T2G | 功能描述:運算放大器 - 運放 ANA SINGL OP AMP 1V 1MHZ RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| NCV2002 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Sub-One Volt Rail-to-Rail Operational Amplifier with Enable Feature |
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