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LM5122MHX/NOPB Datasheet(PDF) 13 Page - Texas Instruments |
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LM5122MHX/NOPB Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 49 page  0.4V/0.3V SHUTDOWN 10uA UVLO + - + - STANDBY 1.2V CLK S R Q Q 750mV PWM Comparator C/L Comparator VCC Regulator VCC PGND VCC LEVEL SHIFT DIODE EMULATION BST HO SW LO ADAPTIVE TIMER PWM + - ZCD threshold CSN CS AMP 1.2 V 1.2V + + - FB COMP ERR AMP - + LM5122 CSP SS 10uA RESTART TIMER RES 30uA 10uA 5uA SYNCIN/RT SYNCOUT Clock Generator /SYNC Detector CLK A=10 SLOPE SLOPE Generator VSENSE1 VSENSE2 VIN VOUT CIN COUT LIN QH QL RS DBST CVCC CBST RFB2 RFB1 RT CRES CSS RUV2 RUV1 RSLOPE BST Charge Pump RCOMP CCOMP CHF 1.2V 700k 100k MODE Skip Cycle Comparator 40mV Hysteresis 1.2V Diode Emulation + - fCLK / 2 or fCLK RSLOPE 6 u 10 VSLOPE fSW 9 u = AGND - + 20mV + - VIN + - OPT Diode Emulation Comparator VIN 13 LM5122, LM5122-Q1 www.ti.com SNVS954G – FEBRUARY 2013 – REVISED MAY 2016 Product Folder Links: LM5122 LM5122-Q1 Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM5122 wide input range synchronous boost controller features all of the functions necessary to implement a highly efficient synchronous boost regulator. The regulator control method is based upon peak current mode control. Peak current mode control provides inherent line feed-forward and ease of loop compensation. This highly integrated controller provides strong high-side and low-side N-channel MOSFET drivers with adaptive dead-time control. The switching frequency is user programmable up to 1 MHz set by a single resistor or synchronized to an external clock. The LM5122’s 180º shifted clock output enables easy multi-phase configuration. The control mode of high-side synchronous switch can be configured as either forced PWM (FPWM) or diode emulation mode. Fault protection features include cycle-by-cycle current limiting, hiccup mode over load protection, thermal shutdown and remote shutdown capability by pulling down the UVLO pin. The UVLO input enables the controller when the input voltage reaches a user selected threshold, and provides a tiny 9 μA shutdown quiescent current when pulled low. The device is available in 20-pin HTSSOP package featuring an exposed pad to aid in thermal dissipation. 7.2 Functional Block Diagram |
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