PWM Controllers

Pulse width modulation (PWM) is a modulation technique that is used to encode a message into a pulsing signal. PWM controllers encode data onto the duty cycle (the ratio or percentage of one period in which a signal or system is active). The encoded data is commonly used in power electronic systems to regulate the amount of power applied to the load. 


How do PWM controllers work?

A PMC will use voltage feedback to ensure that the voltage applied to a load is precisely controlled. The controller will supervise the switching operation to regulate the output voltage by comparing output voltage with the desired output to derive the correct voltage. They are popular because of their high efficiency over a wide voltage input range.


A PWM controller can also be integrated with a hot swap controller for enhanced power monitoring accuracy.


What are PWM controllers used for?

PWM controllers are common in many applications including variable speed fans, house dimmer switches and electric cookers. 


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Description Price Maximum Switching Frequency Start-up Supply Current Maximum Source Current Maximum Sink Current Maximum Supply Current Zero Power Detection Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage
RS Stock No. 528-123
Mfr. Part No.TL494CN
$0.80
Each (In a Tube of 25)
units
300 kHz - - - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 40 V
RS Stock No. 121-9164
Mfr. Part No.TL494IDR
$0.316
Each (On a Reel of 2500)
units
300 kHz - - - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm 1.58mm 40 V
RS Stock No. 517-0889
Mfr. Part No.TL494ID
$1.18
Each (In a Pack of 5)
units
300 kHz - - - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm 1.58mm 40 V
RS Stock No. 661-6875
Mfr. Part No.TL494IDR
$0.442
Each (In a Pack of 5)
units
300 kHz - - - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm 1.58mm 40 V
RS Stock No. 168-6471
Mfr. Part No.L6598
$3.003
Each (In a Tube of 25)
units
400 kHz 0.25mA 250mA 450mA 25 mA - Through Hole PDIP 16 20 x 7.1 x 5.1mm 20mm 7.1mm 5.1mm 16.6 V
RS Stock No. 517-2986
Mfr. Part No.TL494IN
$0.414
Each (In a Pack of 5)
units
300 kHz - - - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 40 V
RS Stock No. 168-5127
Mfr. Part No.TL1451ACD
$1.986
Each (In a Tube of 40)
units
- - - - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm 1.58mm -
RS Stock No. 686-8433
Mfr. Part No.L6598
$3.54
Each (In a Pack of 2)
units
400 kHz 0.25mA 250mA 450mA 25 mA - Through Hole PDIP 16 20 x 7.1 x 5.1mm 20mm 7.1mm 5.1mm 16.6 V
RS Stock No. 462-1083
Mfr. Part No.TL1451ACD
$2.112
Each (In a Pack of 5)
units
- - - - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm 1.58mm -
RS Stock No. 415-1045
Mfr. Part No.L6598D
$3.54
Each
units
400 kHz 0.25mA 250mA 450mA 25 mA - Surface Mount SOIC 16 10 x 4 x 1.64mm 10mm 4mm 1.64mm 16.6 V
RS Stock No. 168-6083
Mfr. Part No.L6598D
$3.01
Each (In a Tube of 50)
units
400 kHz 0.25mA 250mA 450mA 25 mA - Surface Mount SOIC 16 10 x 4 x 1.64mm 10mm 4mm 1.64mm 16.6 V
RS Stock No. 162-6749
Mfr. Part No.TL494CNSR
$0.323
Each (On a Reel of 2000)
units
300 kHz 9 → 15mA 200mA 200mA 3.5 mA Yes Surface Mount SOIC 16 10.5 x 5.6 x 1.85mm 10.5mm 5.6mm 1.85mm 40 V
RS Stock No. 121-9013
Mfr. Part No.UCC2895DW
$9.254
Each (In a Tube of 25)
units
1 MHz 150µA - - - - Surface Mount SOIC 20 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm 2.35mm 16.5 V
RS Stock No. 110-9090
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
$1.441
Each (In a Pack of 10)
units
65 kHz 550µA - - 2.3 mA Yes Surface Mount DSO 8 5 x 4 x 1.65mm 5mm 4mm 1.65mm 27 V
RS Stock No. 809-5393
Mfr. Part No.TL494CNSR
$0.20
Each (In a Pack of 5)
units
300 kHz 9 → 15mA 200mA 200mA 3.5 mA Yes Surface Mount SOIC 16 10.5 x 5.6 x 1.85mm 10.5mm 5.6mm 1.85mm 40 V
RS Stock No. 652-5779
Mfr. Part No.UCC2895DW
$11.01
Each
units
1 MHz 150µA - - - - Surface Mount SOIC 20 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm 2.35mm 16.5 V
RS Stock No. 166-0829
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
$1.50
Each (On a Reel of 2500)
units
65 kHz 550µA - - 2.3 mA Yes Surface Mount DSO 8 5 x 4 x 1.65mm 5mm 4mm 1.65mm 27 V
RS Stock No. 796-9489
Mfr. Part No.TS19375CS RLG
$0.902
Each (In a Pack of 10)
units
500 kHz 8µA - - 20 μA - Surface Mount SOP 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 24 V
RS Stock No. 121-6370
Mfr. Part No.NCP1031DR2G
$1.42
Each (On a Reel of 2500)
units
325 kHz 3mA 140µA 900µA 4 mA - Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 16 V
RS Stock No. 165-2082
Mfr. Part No.MCP1631-E/ML
BrandMicrochip
$1.89
Each (In a Tube of 91)
units
2 MHz - -9.8mA 12mA - - Surface Mount QFN 20 4 x 4 x 1mm 4mm 4mm 1mm 5.5 V
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