PWM

PWM stands for Pulse Width Modulation. Electronic circuits can contain both analogue and digital components. PWM allows you to control analogue devices using a digital signal. Many electrical designs use PWM for regulation.

Analogue signals can be on or off, but they can also be half-way on etc. Whereas a digital signal has just on or off positions. Both signals appear in electronic circuits and are required to work together. Inputs can be converted using a DAC or ADC. PWM is available to control the output of a device. For example, a PWM can convert the digital output of a microcontroller (MCU) into an analogue signal, to drive the next analogue component.

Types of PWM device:

  • PWM Voltage Mode Controllers work by applying a control voltage (Vc) and a PWM ramp (Vramp) input.
  • PWM Current Mode Controllers add a second loop feeding back to the inductor current to create the PWM ramp.
  • PWM Switching Regulators feed the input voltage back through the PWM controller to keep the output voltage constant.

What is duty cycle?

PWM signals feature two main things, frequency and a duty cycle. Duty cycle is given as a % and refers to the amount of time the signal is on. For example, if the duty cycle is 50%, the signal is on for 50% and off for 50% of the time period. Pulse width modulation uses a rectangular pulse wave.

Where is PWM used?

  • Motors
  • LED lighting
  • Lamps
  • Heaters/HVAC
  • Electric vehicles
  • Robotics
  • Communication systems

...
Read more Read less

Filters

Viewing 21 - 40 of 737 products
Results per page
Description Price Maximum Switching Frequency Start-up Supply Current Maximum Source Current Maximum Sink Current Maximum Supply Current Output Voltage Output Current Zero Power Detection Control Method Number of Outputs Fall Time Mounting Type Package Type Rise Time
RS Stock No. 166-1619
Mfr. Part No.FAN7602CMX
MYR1.258
Each (On a Reel of 2500)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 168-7315
Mfr. Part No.UC2845BD1
MYR1.969
Each (In a Tube of 100)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 516-5168
Mfr. Part No.UC3844BNG
MYR2.19
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 786-6614
Mfr. Part No.UC2842BDG
MYR2.41
Each (In a Pack of 5)
units
250 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 121-7953
Mfr. Part No.NCP1236BD65R2G
MYR1.522
Each (On a Reel of 2500)
units
70 kHz - - - - - - - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 178-4732
Mfr. Part No.UC3844BNG
MYR2.04
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6829
Mfr. Part No.UC2845BN
MYR3.16
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-7838
Mfr. Part No.UC2845BD1
MYR2.50
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 786-6677
Mfr. Part No.UC3844BDR2G
MYR1.719
Each (In a Pack of 10)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 162-9678
Mfr. Part No.UC3844BDR2G
MYR0.859
Each (On a Reel of 2500)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 121-8954
Mfr. Part No.UC3525AN
MYR8.263
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 620-0543
Mfr. Part No.UC3525AN
MYR9.87
Each (In a Pack of 5)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 821-5168
Mfr. Part No.NCP1236BD65R2G
MYR2.651
Each (In a Pack of 20)
units
70 kHz - - - - - - - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 714-1149
Mfr. Part No.UC2845BN
MYR2.692
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 923-3830
Mfr. Part No.UC3842AN
MYR5.00
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 922-3445
Mfr. Part No.UC3526ADW
MYR11.165
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 126-3181
Mfr. Part No.NCP12510BSN65T1G
MYR1.706
Each (In a Pack of 20)
units
65 kHz - - - - 8 to 14 V 300 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 802-2134
Mfr. Part No.NCP1200P40G
MYR3.129
Each (In a Pack of 10)
units
48 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 121-8574
Mfr. Part No.UC2875DWP
MYR52.156
Each (In a Tube of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 802-3118
Mfr. Part No.NCP1203P60G
MYR3.164
Each (In a Pack of 10)
units
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns