Does the "0-100%" mean the duty-cycle of the PWM? If "0-100%" indicates the duty-cycle range, how come the maximum duty-cycle mentioned in the datasheet of UC3525A (downloaded from Unitrode) is around 49% only?IanP said:PWM range can be adjusted from 0-100%:
VR1: setting the minimum output voltage
VR3: setting the maximum output voltage
Sorry... but I still don't get your point yet. Would u pls advise how could the duty-cycle be extended to 100% when OutA and OutB are tied together? Thanks.IanP said:The data sheet is correct for OutA and OutB, but in this example OutA and OutB are tied together ..
IanP said:PWM frequency is 100HZ-5KHZ (adjustable):
VR2: setting the output frequency
Noted...IanP said:You were right, the values of Rt and Ct on the schematic diagram were incorrect ..
They should be as follows:
RV2-->100kΩ
C3-->100nF
Ref: h**p://www.apogeekits.com/PDF_Files/Manual_K8004.pdf
Fig.10 shows just another way of connecting external transistor to increase the output current ..
Based on the schematic in PWM_SG3525.jpg, why do we need TWO VRs to set the minimum and maximum duty cycle or output voltage? Pls Thanks.IanP said:PWM range can be adjusted from 0-100%:
VR1: setting the minimum output voltage
VR3: setting the maximum output voltage
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