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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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庫存編號 786-2552
製造零件編號TL594CDR2G
Brandonsemi
HK$8.72
/個 (每包:10個)
單位
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS庫存編號 162-9675
製造零件編號TL594CDR2G
Brandonsemi
HK$3.977
個 (在毎卷:2500)
單位
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS庫存編號 178-5490
製造零件編號UC1843J
HK$93.269
毎管:10 個
單位
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS庫存編號 661-5232
製造零件編號UC3526ADW
HK$35.542
/個 (每包:5個)
單位
650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS庫存編號 445-573
製造零件編號L6566B
HK$18.786
/個 (每包:5個)
單位
107 kHz - - - - - 800 mA - - 1 - Surface Mount SOIC -
RS庫存編號 796-8461
製造零件編號UC1843J
HK$158.75
單位
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS庫存編號 922-3445
製造零件編號UC3526ADW
HK$30.196
毎管:40 個
單位
- - - - - - - - - - - - - -
RS庫存編號 166-0930
製造零件編號L6566B
HK$15.954
毎管:30 個
單位
107 kHz - - - - - 800 mA - - 1 - Surface Mount SOIC -
RS庫存編號 689-9954
製造零件編號UC3843BD1G
Brandonsemi
HK$6.96
/個 (每包:2個)
單位
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS庫存編號 714-1004
製造零件編號SG3525AP
HK$21.12
/個 (每包:2個)
單位
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS庫存編號 145-5764
製造零件編號UC2525AN
HK$18.509
毎管:25 個
單位
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS庫存編號 163-2713
製造零件編號UC3843BD1G
Brandonsemi
HK$5.912
毎管:98 個
單位
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS庫存編號 714-7850
製造零件編號SG3524P
HK$18.315
/個 (每包:2個)
單位
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS庫存編號 517-2986
製造零件編號TL494IN
HK$9.144
/個 (每包:5個)
單位
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS庫存編號 168-7318
製造零件編號SG3524P
HK$15.518
毎管:50 個
單位
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS庫存編號 920-3479
製造零件編號TL494IN
HK$7.847
毎管:25 個
單位
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS庫存編號 168-6816
製造零件編號SG3525AP
HK$17.879
毎管:50 個
單位
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS庫存編號 145-0998
製造零件編號UC3525BDW
HK$59.873
毎管:40 個
單位
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS庫存編號 661-5229
製造零件編號UC3525BDW
HK$69.47
單位
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS庫存編號 739-0284
製造零件編號KA3525A
Brandonsemi
HK$11.632
/個 (每包:5個)
單位
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -