4 / 10 page  RT9229 www.richtek-ic.com.tw DS9229-03 July 2001 4 Function Block Diagram 110% 90% 115% POWER-ON RESET (POR) SOFT-START & FAULT LOGIC GATE CONTROL LOGIC LINEAR UNDER VOLTAGE PGOOD PHASE1 LGATE1 PGND GND VCC FB3 OCSET1 VSEN1 GATE3 0.3V VSEN2 1.26V VOUT2 FB4 0V VID1 VID2 VID3 VID4 LUV OC1 PWM1 INHIBIT LOWER DRIVE VCC VCC UPPER DRIVE UGATE1 200 µA OC GATE CONTROL COMPEN- SATION OSCILLATOR VCC 11 µA 5V COMPEN- SATION TTL D/A CONVERTER (DAC) OCSET2 0.25V VCC PHASE2 UGATE2 FB2 VSEN2 OC2 OC4 2.5V 4.3V 1.26V FAULT SS FB1 DACOUT ERROR AMP1 PWM COMP1 ERROR AMP2 200 µA INHIBIT PWM COMP2 PWM2 VID0 _ _ _ _ |
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