PWM

Electronic circuits can contain both analogue and digital components. PWM, which stands for Pulse Width Modulation, facilitates the control of analogue devices using a digital signal. Many electrical designs use PWM for regulation, with PWM used as a way to reduce the average power that is delivered by an electrical signal by chopping it up into smaller parts. RS Components offer a range of PWM Controllers from a multitude of trusted brands, including ON Semiconductor, STMicroelectronics, Texas Instruments, and more.

What do PWMs do?

Analogue signals can be on or off, or can even be put into a position half-way between the two, whereas a digital signal has just on or off positions. Both signals appear in electronic circuits and can often be required to work together. Inputs can be converted using a DAC (digital-to-analogue converter) or an ADC (analogue-to-digital converter). PWM is available to control the output of a device: for example, PWM can convert the digital output of a microcontroller (MCU) into an analogue signal to drive the next analogue component.

Types of PWM devices:

  • 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 a duty cycle?

PWM signals feature two main things: frequency and a duty cycle. Duty cycle is given as a percentage (%) 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 are PWM controllers used?

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

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RS庫存編號 528-123
製造零件編號TL494CN
TWD14.20
毎管:25 個
單位
300 kHz - - - - 40(Max) V 200 (Max) mA - - - - Through Hole PDIP -
RS庫存編號 661-5813
製造零件編號UCC3801N
TWD124.00
單位
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS庫存編號 179-2109
製造零件編號UCC3801N
TWD139.10
毎管:50 個
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1000 kHz - - - - - 1 A - Current - 44ns Through Hole PDIP 41ns
RS庫存編號 922-3445
製造零件編號UC3526ADW
TWD96.30
毎管:40 個
單位
- - - - - - - - - - - - - -
RS庫存編號 661-5232
製造零件編號UC3526ADW
TWD118.60
/個 (每包:5個)
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650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS庫存編號 121-8952
製造零件編號UC3525ADW
TWD60.90
毎管:40 個
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400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS庫存編號 620-0515
製造零件編號UC3525ADW
TWD78.80
/個 (每包:5個)
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400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS庫存編號 121-8957
製造零件編號UC3846N
TWD141.10
毎管:25 個
單位
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS庫存編號 919-6478
製造零件編號UC3842BN
TWD21.30
毎管:50 個
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 686-5033
製造零件編號UC3842BN
TWD26.80
/個 (每包:10個)
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 620-0593
製造零件編號UC3846N
TWD166.60
/個 (每包:5個)
單位
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS庫存編號 145-7139
製造零件編號UC2845D
TWD39.60
毎管:50 個
單位
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS庫存編號 922-3451
製造零件編號UC3843AD8
TWD45.10
毎管:75 個
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- - - - - - - - - - - - - -
RS庫存編號 661-5333
製造零件編號UC3843AD8
TWD49.80
/個 (每包:5個)
單位
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS庫存編號 526-842
製造零件編號UC3843AN
TWD76.20
/個 (每包:5個)
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 121-8408
製造零件編號UC3843AN
TWD50.50
毎管:50 個
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 121-9164
製造零件編號TL494IDR
TWD51.60
個 (在毎卷:2500)
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300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS庫存編號 739-0284
製造零件編號KA3525A
TWD32.20
/個 (每包:5個)
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430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS庫存編號 661-6875
製造零件編號TL494IDR
TWD170.80
/個 (每包:5個)
單位
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS庫存編號 923-3842
製造零件編號UC3844N
TWD50.50
毎管:50 個
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns