By Raymond A. Mack
This e-book is a crash path within the primary thought, strategies, and terminology of switching energy offers. it's designed to quick arrange engineers to make key judgements approximately strength provides for his or her tasks. meant for readers who have to fast comprehend the foremost issues of switching energy provides, this e-book covers the 20% of the subject that engineers use, eighty% of the time. in contrast to latest switching strength provide books that deal strictly with layout matters, this booklet additionally acknowledges the growing to be significance of «off-the-shelf» advertisement switching energy offers, giving readers the historical past essential to decide upon the perfect advertisement offer. This booklet covers the center necessities of strength provide conception and layout whereas holding arithmetic to absolutely the minimal important. certain awareness is given to the choice of acceptable parts, comparable to inductors and transformers, to make sure secure and trustworthy operation. Engineers, whose major layout duties are in different components, will greater comprehend the strengths and weaknesses of switching strength provides and even if such offers are acceptable for his or her tasks. they are going to be capable of supply extra significant layout requisites and requirements to people who layout switching strength provides.
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Extra info for Demystifying Switching Power Supplies
It is obvious from this part of the data sheet that the 1526A was designed when 20 kHz supplies were state of the art. We would want to increase the dead time for push-pull or bridge circuits where we are using slow bipolar transistors as switches. Bipolar switches store charge in the base-collector junction that must be recombined before the transistor will shut off. Increasing dead time ensures that one transistor has completely turned off before the alternate transistor begins to conduct. qxd 02/17/05 7:10 PM Page 36 Demystifying Switching Power Supplies The oscillator also has a sync pin that allows the oscillator to be synchronized to an external oscillator or to sync another controller.
The 1846A oscillator can be synchronized to another 1846A or to an external oscillator in the same way as performed on the 1526A. The under-voltage lockout circuit is different in that it uses the input voltage to make the lockout decision rather than the reference voltage. 0 V. 75 V of hysteresis to ensure that noise or slowly rising input voltage will not cause an unstable condition at turn on. The error amplifier is a transconductance amplifier with an “open collector” output similar to that in the 1526A.
Test Sequence: 1. Start compensation with a resistance of 1 kΩ and capacitance of 2 µF. This will load the error amplifier for high frequencies and create a dominant pole due to the capacitance and the load of the PWM circuit. There will be a zero in the response due to the resistance but it will have very little effect. qxd 02/17/05 7:10 PM Page 32 Demystifying Switching Power Supplies 2. Verify that there are no ground loops by connecting the scope channel 1 probe to the ground connection. If channel 1 shows any response, you must isolate the scope or signal generator by breaking the safety ground connection.