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LM5145 Datasheet(PDF) 33 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 33 Page - Texas Instruments |
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33 / 70 page  m O-EA 1 c REF c out OUT p1 p2 s g R 1 Öv (s) V G (s) Öv (s) V s s 1 1 Z Z Z § · ˜ ˜ ¨ ¸ © ¹ ˜ § · § · ˜ ¨ ¸ ¨ ¸ ¨ ¸ ¨ ¸ © ¹ © ¹ z (27) where • VREF is the feedback voltage reference of 0.8 V. • gm is the EA gain transconductance of 1200 µS. • RO-EA is the error amplifier output impedance of 64 MΩ. Z1 COMP COMP 1 R C Z ˜ (28) p1 O-EA COMP HF BW O-EA COMP 1 1 R C C C R C Z # ˜ ˜ (29) p2 COMP HF COMP COMP HF BW 1 1 R C R C C C Z # ˜ ˜ (30) The EA compensation components create a pole close to the origin, a zero, and a high-frequency pole. Typically, RCOMP << RO-EA and CCOMP >> CBW and CHF, so the approximations are valid. Error Amplifier Model VREF COMP FB CHF CBW RO-EA ± + Zz1 Zp2 Zp1 RFB1 VOUT gm RFB2 CCOMP RCOMP AGND Figure 9-3. Error Amplifier and Compensation Network www.ti.com LM5148 SNVSC01 – FEBRUARY 2023 Copyright © 2023 Texas Instruments Incorporated Submit Document Feedback 33 Product Folder Links: LM5148 |
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