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

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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. 162-8992
Mfr. Part No.NCP1203P60G
MYR3.095
Each (In a Tube of 50)
units
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 145-5737
Mfr. Part No.UC2843AD8
MYR5.64
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 178-9140
Mfr. Part No.UC2825DW
MYR17.489
Each (In a Tube of 40)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
RS Stock No. 169-5584
Mfr. Part No.TL2845P
MYR2.513
Each (In a Tube of 50)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 802-3105
Mfr. Part No.NCP1203D60R2G
MYR3.29
Each (In a Pack of 10)
units
60 kHz - - - - - 250 mA - Current 1 28ns Surface Mount SOIC 67ns
RS Stock No. 661-6866
Mfr. Part No.TL494CDR
MYR1.196
Each (In a Pack of 10)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 100-8067
Mfr. Part No.NCP1014AP065G
MYR3.283
Each (In a Tube of 50)
units
71 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 620-0458
Mfr. Part No.UC2843AD8
MYR6.866
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 145-5980
Mfr. Part No.TL494CDR
MYR0.596
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 661-5232
Mfr. Part No.UC3526ADW
MYR13.708
Each (In a Pack of 5)
units
650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS Stock No. 145-6183
Mfr. Part No.UC2524AN
MYR8.34
Each (In a Tube of 25)
units
- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 121-8541
Mfr. Part No.UC3825N
MYR17.754
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 121-7263
Mfr. Part No.ISL68201IRZ-T7A
BrandIntersil
MYR22.84
Each
units
1.5 MHz - - - - 5.5 V >40 A Yes - 1 - Surface Mount QFN -
RS Stock No. 178-4853
Mfr. Part No.HV9120P-G
BrandMicrochip
MYR12.68
Each (In a Tube of 24)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Through Hole PDIP 75ns
RS Stock No. 163-2223
Mfr. Part No.NCP1937B1DR2G
MYR3.706
Each (On a Reel of 2500)
units
30.5 kHz 20mA 290µA 48µA 5.2 mA - - - - 1 - Surface Mount SOIC -
RS Stock No. 661-5493
Mfr. Part No.UCC2801D
MYR13.35
Each
units
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS Stock No. 168-7152
Mfr. Part No.UC2842BD1
MYR1.95
Each (In a Tube of 100)
units
500 kHz - - - - 5.05 V ±1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 620-0492
Mfr. Part No.UC3524AN
MYR8.784
Each (In a Pack of 5)
units
500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 168-4857
Mfr. Part No.SG2524DR
MYR2.178
Each (On a Reel of 2500)
units
450 kHz - - - - - 100 mA - - - - Surface Mount SOIC -
RS Stock No. 197-7626
Mfr. Part No.UC3844AN
MYR7.992
Each (In a Pack of 5)
units
500 KHz - - - - - ±1 A - - 1 50ns - PDIP 50ns