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Hello everyone, in this lesson we will explain some pin positions of PWM chips

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The first is the upper tube drive

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It can be called UGATE in the chip, or it can be called DH or HDRV, DRVH

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The lower tube drive pin is opposite to the upper tube drive pin

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Its name in the chip is LGATE, DL, LDRV, DRVL

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Bootstrap pin

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The bootstrap pin is called BOOT, BST or BOOST

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Next is the feedback regulation, the voltage setting pin, FB or VSET

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Input voltage detection input pin, OUT, VOUT, VO

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It should be noted here that in the PWM circuit, the OUT pin is not an output pin,

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but an output voltage detection input pin.

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It does not mean the same as OUT in other circuits

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Further down, voltage sensing and current sensing, VSEN and ISEN

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Phase pin, PHASE, SW, LX

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Current sense pins, CSP and CSN

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Limit current setting pin, over-current protection threshold setting, ILIM, TRIP, CS, OC, OCSET

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Next, the working mode setting pin

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These four names all represent working mode setting pins

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Frequency setting pins, TON, RT, RF, FSET, FS

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In general, most of the chips are called TON

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Feedback compensation pin, COMP

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Although it has so many pins, the pins that must be mastered are the upper tube drive pin,

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the lower tube drive pin, the bootstrap presser pin,

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the feedback adjustment pin and the phase pin.

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To repair the PWM circuit, these 5 pins must be known

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Next, let's take a look at the pin position of this chip.

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First of all, BOOT, we know that it is a bootstrap presser pin

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UGATE is connected to the G pole of the upper tube, then it is the driver pin of the upper tube

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The phase pin is connected to the front end of the inductor, connected to the S pole of the upper tube,

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and connected to the D pole of the lower tube

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The lower tube drive pin can be used as a limit current setting pin

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VCC, VCC is the power supply pin of the chip

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FB, feedback adjustment pin

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EN, enable pin

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PG, power good signal

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REFIN and REFOUT, the output and input of the reference

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GND, ground pin

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The above are the basic pin explanations of the PWM chip.