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. 145-7139
Mfr. Part No.UC2845D
MYR4.87
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 828-7444
Mfr. Part No.AP3105NVKTR-G1
MYR1.94
Each (In a Pack of 25)
units
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -
RS Stock No. 197-7618
Mfr. Part No.UC3526AN
MYR12.897
Each (In a Tube of 20)
units
600 KHz - - - - - 200 mA - - 2 100ns - PDIP 300ns
RS Stock No. 796-9010
Mfr. Part No.ADP2381AREZ-R7
MYR18.19
Each (In a Pack of 2)
units
1.4 MHz - - - - 3.3 V 6 A - - 1 - Surface Mount TSSOP -
RS Stock No. 122-0122
Mfr. Part No.NCP1236BD100R2G
MYR1.522
Each (On a Reel of 2500)
units
32 kHz - - - - 28 V 500 mA - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 188-8279
Mfr. Part No.SG3525AP013TR
MYR3.113
Each (On a Reel of 2500)
units
400 kHz - - - - 5.2 V 500 mA - - 1 300ns Surface Mount SO 600ns
RS Stock No. 761-5255
Mfr. Part No.LM5020SD-1/NOPB
MYR11.66
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 15ns Surface Mount LLP 18ns
RS Stock No. 162-6066
Mfr. Part No.UCC2804N
MYR11.998
Each (In a Tube of 50)
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 121-7950
Mfr. Part No.NCP1012ST100T3G
MYR2.216
Each (On a Reel of 4000)
units
110 kHz - - - - - 550 mA - Current 1 10ns Surface Mount SOT-223 20ns
RS Stock No. 121-8950
Mfr. Part No.UC2825N
MYR20.61
Each (In a Tube of 25)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Through Hole PDIP 30ns
RS Stock No. 168-5127
Mfr. Part No.TL1451ACD
MYR7.155
Each (In a Tube of 40)
units
- - - - - 50 V - - - 2 - Surface Mount SOIC -
RS Stock No. 786-8806
Mfr. Part No.NCP1207ADR2G
MYR4.70
Each (In a Pack of 5)
units
60 kHz - - - - 10 V 500 mA - Current 1 20ns Surface Mount SOIC 40ns
RS Stock No. 162-9494
Mfr. Part No.NCP1252CDR2G
MYR1.846
Each (On a Reel of 2500)
units
550 kHz - - - - 10 V 500 mA, -800 mA - Current 1 22ns Surface Mount SOIC 26ns
RS Stock No. 464-316
Mfr. Part No.NCP1014AP100G
MYR4.546
Each (In a Pack of 5)
units
110 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 922-3454
Mfr. Part No.UC3823N
MYR18.757
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 786-8866
Mfr. Part No.NCP1250BSN65T1G
MYR1.616
Each (In a Pack of 10)
units
71 kHz - - - - 28.3 V 300 (Source) mA, -500 (Sink) mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 121-9153
Mfr. Part No.UC2879N
MYR47.294
Each (In a Tube of 20)
units
300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS Stock No. 145-7763
Mfr. Part No.UC2827DW-1
MYR32.678
Each (In a Tube of 25)
units
500 kHz - - - - - 250 mA - Current, Voltage 3 30ns Surface Mount SOIC 40ns
RS Stock No. 226-9829
Mfr. Part No.UCC3806N
MYR47.32
Each
units
52 kHz - - - - - 500 mA - Current 2 35ns Through Hole PDIP 35ns
RS Stock No. 121-8412
Mfr. Part No.UC2843AN
MYR5.549
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns