1、RT9238RT9238是一款高效、穩定的主板電源控制芯片。 主板中作為CPU供電控制芯片。RT9238是單相PWM控制芯片，通常應用在 815芯片組RT9238的內部電路框圖VSEN3OCSETVCCDRIVE4VSEN4DRIVE2VSEN2-VAUXEA3DRIVE3 L0.75UV3 一上電復位VAUXEA41.26V+UV4INHIBIT200比 Ax1.15FAULTI 1.2V:XIL、uV2SETQDCLRVTT PGQ Ad振蕩器FAULT/VID4VCCJ LOVa誤邏輯輸岀OCEA1COMPVCCDRIVE1<時柵極控制器pWmSYNCHDRIVE IVCC IP

2、GOODPHASE1LGATE1P GND28遜4.5V28卞.5V40m(DAC)TTL D/A轉換器VDACRSRSGNDSS13 SS24 FB1VID3 VID1 VID25ICOMPVID2 VID0RT9238的針腳封裝圖DRIVE2 L_I_ VCCFIX |-2-27 UGATE1VID3 E3ZZ3 PH ASE1VID2 |T-円 LGATE1VID1 CZZZ3 PGNDVID0 |-rF OCSET1VID25 un FB1PGOOD dVDACVTTPG CZ3 ICOM PFAULT/VID4 CZ23 VSEN3VSEN2 CT23 DRIVE3SS24 CL G

3、NDSS13口 VAUXVSEN4 Ctd DRIVE4moMAX1992 MAX1993勺典型應用電路圖1DRIVE2供電電壓驅動信號輸出端1.2Vx2FIX通常空置不用，供電電壓補償端1.2V、1.5V3VID3f4VID2i此時無控制信號，模式CPU 無“則工作在，個引腳均懸空5電壓模式識別端。若這CPU 輸出a5VID16VID07VID25n8P GOOD信號輸出端P GOOD9VTT PG信號輸出端P GOOD電壓VTT10FAULT/VID4過壓保護信號輸出端i/CPU電壓模式識別端411VSEN2供電檢測反饋輸入端1.2V12SS24軟啟動控制端13SS13軟啟動控制端c14V

4、SEN4供電檢測反饋輸入端1.8V北橋芯片15DRIVE4北橋芯片.1.8V供電開關管驅動信號輸出端16VAUX供電輸入端3.3V17GND接地端18DRIVE3供電開關管驅動信號輸出端1.5V顯卡AGP19VSEN3供電檢測反饋輸入端1.5V顯卡AGP20 WICO MP誤差放大器輸出端21VDAC濾波器VDAC22FBI主電壓反饋端23OCSET1振蕩頻率設置端24P GND功率電路接地端25LGATEL管驅動信號輸出端MOSEET下26PHASE1過流檢測反相輸出端27管驅動信號輸出:端 MOSEET 上UGATE128供電電壓輸出:端 12VVCCMAX1992 MAX1993勺典型應

5、用電路圖fibVID4VID3VID2VID1VID0VID25(V)輸出電壓0010001.050+40mV=1.0900010011.075+40mV=1.1150001101.100+40mV=1.1400001111.125+40mV=1.165m0001001.150+40mV=1.1900001011.175+40mV=1.2150000101.200+40mV=1.240o0000111.225+40mV=1.2650000001.250+40mV=1.2900000011.275+40mV=1.3150111101.300+40mV=1.340 C0111111.325+40m

6、V=1.365011100'1.350+40mV=1.3900d110 ri1X1 375+40mV=1 41501111101 f01.400+40mV=1.4400110a111.425+40mV=1.4650110L001.450+40mV=1.4900110 n1 011.475+40mV=1.5150101101.500+40mV=1.540010i1111.525+40mV=1.565010 h1001.550+40mV=1.5900101011.575+40mV=1.61501c00101.600+40mV=1.6400100111.625+40mV=1.66501 00

7、001650+40mV=1.6900w100011 675+40mV=1 7150 XA> 011101.700+40mV=1.7400 W/ 011111 725+40m/=1 7650011001 750+40mV=1 7900011011.775+40mV=1.815w0010101 800+40mV=1 8400010111 825+40m/=1 8651010001 850+40mV=1 8901001101 900+40mV=1 9401001001.950+40mV=1.9901000102 000+40m/=2 04012.050+40mV=2.090VAUX 0VTTO

8、UT21.2VVTTPGoAGP °OUT31.5VOUT4 cf1.8VRT9238的典型應用電路圖+C56 1000 mFQ4P HD3055EFIXPHD3055E3R6C61K1mFT 10uF丄 + C9 丄C8T 560 (iFT 1 uF 丄 丄 Q5-2SD180219h_ C11 J560 mFC101uFR11C14p1 (iF28 =VCCFIXOCSET1P GOODUGATE1PHASE1DRIVE2VSEN2LGATE1RI9238P GNDVTT PGFB1VAUXVDACarDRIVE3ICO MP1iVID25VID0VSEN3VID1VID2VID3FAULT/VID4DRIVE4SS24VSEN4SS1GNDL1191815141716+C15C12000 uFZ115V23C27000pF'R22713=2625xiPHQ1PHB83N03LTP GOODQ2iLTR3? 10K+C3f22 I2120R6%C1610nF8000 mF-76C VID25VI