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PM6675AS Datasheet(PDF) 19 Page - STMicroelectronics |
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PM6675AS Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 48 page  PM6675AS Device description 19/48 Figure 24. Switching section simplified block diagram 7.1.2 Output ripple compensation and loop stability The loop is closed connecting the center tap of the output divider (internally, when the fixed output voltage is chosen, or externally, using the VSEL pin in the adjustable output voltage mode). The feedback node is the negative input of the error comparator, while the positive input is internally connected to the reference voltage (Vr = 0.6 V). When the feedback voltage becomes lower than the reference voltage, the PWM comparator goes high and sets the control logic, turning on the high-side MOSFET. After the On-Time (calculated as previously described) the system releases the high-side MOSFET and turns-on the synchronous rectifier. The voltage drop along ground and supply PCB paths, used to connect the output capacitor to the load, is a source of DC error. Further the system regulates the output voltage valley, not the average, as shown in Figure 22. Thus, the voltage ripple on the output capacitor is an additional source of DC error. To compensate this error, an integrative network is introduced in the control loop, by connecting the output voltage to the COMP pin through a capacitor (CINT) as shown in Figure 25. + - H HS S L Le ev ve ell s sh hiifftte err L LS S Q Q R S T To on n--m miin n Anti cross- conduction circuitry T To offff--m miin n Q R S + - P PW WM M C Co om mp pa arra atto orr P Po os siittiiv ve e C Cu urrrre en ntt L Liim miitt c co om mp pa arra atto orr 0 0..6 6V V Q Q R S + _ M Miin n ffs sw w c co ou un ntte err Z Ze erro o--c crro os ss siin ng g C Co om mp pa arra atto orr b ba an nd dg ga ap p 1 1..2 23 36 6V V P PH HA AS SE E P PG GN ND D L LG GA AT TE E B BO OO OT T C CS SN NS S + C CO OM MP P g gm m IIn ntte eg grra atto orr V VS SN NS S V VB BG G V VB BG G P PU UL LS SE E -- S SK KIIP P V VS SE EL L VSEL<4V 1-Shot generator T To on n V VS SN NS S V VO OS SC C 0 0..6 6V V 1 10 00 0u uA A 500mV 2.5V 2.5V + - - - + + H HG GA AT TE E V VR RE EF F S SG GN ND D V VO OS SC C V VO OS SC C V VC CC C |
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