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

...
顯示內容 隱藏內容

篩選條件

正在檢視 1 - 20,共 227 項產品
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庫存編號 145-4322
製造零件編號KA3525A
TWD26.80
毎管:25 個
單位
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS庫存編號 739-0284
製造零件編號KA3525A
TWD32.20
/個 (每包:5個)
單位
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS庫存編號 103-5077
製造零件編號SG3525ANG
TWD31.60
毎管:25 個
單位
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS庫存編號 689-9950
製造零件編號SG3525ANG
TWD37.00
/個 (每包:2個)
單位
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS庫存編號 805-2857
製造零件編號UC3842BVD1G
TWD26.00
/個 (每包:25個)
單位
275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 786-6630
製造零件編號UC3842BD1R2G
TWD19.70
/個 (每包:10個)
單位
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 786-6472
製造零件編號NCP1379DR2G
TWD38.00
/個 (每包:5個)
單位
65 kHz - - - - 20 V -800 (Sink) mA, 500 (Source) mA - Current 1 60ns Surface Mount SOIC 75ns
RS庫存編號 145-2939
製造零件編號UC3842BVD1G
TWD26.00
毎管:98 個
單位
275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 162-9502
製造零件編號NCP1379DR2G
TWD15.30
個 (在毎卷:2500)
單位
65 kHz - - - - 20 V -800 mA, 500 mA - Current 1 60ns Surface Mount SOIC 75ns
RS庫存編號 145-2943
製造零件編號UC3844BVDG
TWD22.00
毎管:55 個
單位
275 kHz - - - - 4.9 to 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 145-2786
製造零件編號UC3843BNG
TWD21.70
毎管:50 個
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 805-4572
製造零件編號UC3844BVDG
TWD22.00
/個 (每包:25個)
單位
275 kHz - - - - 4.9 to 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 516-5152
製造零件編號UC3843BNG
TWD26.00
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 162-8992
製造零件編號NCP1203P60G
TWD30.20
毎管:50 個
單位
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS庫存編號 786-6677
製造零件編號UC3844BDR2G
TWD16.70
/個 (每包:10個)
單位
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 805-2848
製造零件編號UC3842BD1G
TWD20.80
/個 (每包:25個)
單位
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS庫存編號 864-4850
製造零件編號FAN6921MRMY
TWD25.00
個 (在毎卷:2500)
單位
440 Hz - - - - - - - Current 1 70ns Surface Mount SOP 100ns
RS庫存編號 760-5841
製造零件編號FAN6921MRMY
TWD56.00
Each (On a Tape of 5)
單位
0.44 kHz - - - - 1.5 V - - Current 1 70ns Surface Mount SOP 110ns
RS庫存編號 102-3497
製造零件編號UC3842BNG
TWD21.70
毎管:50 個
單位
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS庫存編號 163-0083
製造零件編號NCP1396ADR2G
TWD21.50
個 (在毎卷:2500)
單位
575 kHz - - - - - - - Voltage 1 20ns Surface Mount SOIC 40ns