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LTC4232 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4232 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC4234 10 4234fa For more information www.linear.com/LTC4234 APPLICATIONS INFORMATION The typical LTC4234 application is in a high availability system that uses a positive voltage supply to distribute power to individual cards. The complete application circuit is shown in Figure 1. External component selection is discussed in detail in the following sections. Turn-On Sequence Several conditions must be present before the internal pass MOSFET can be turned on. First the supply VDD must exceed its undervoltage lockout level. Next the internally generated supply INTVCC must cross its 2.65V undervolt- agethreshold.Thisgeneratesa25µspower-on-resetpulse whichclearsthefaultregisterandinitializesinternallatches. After the power-on-reset pulse, the UV and OV pins must indicate that the input voltage is within the acceptable Figure 1. 10A, 12V Card Resident Application range. All of these conditions must be satisfied for a du- ration of 48ms to ensure that any contact bounce during the insertion has ended. The MOSFET is turned on by charging up the GATE with a charge pump generated 24µA current source whose value is adjusted by shunting a portion of the pull-up current to ground. The charging current is controlled by the INRUSH circuit that maintains a constant slope of GATE voltage versus time (Figure 2). The voltage at the GATE pin rises with a slope of 0.35[V/ms] and the supply inrush current is set at: IINRUSH= CL • 0.35[V/ms] This gate slope is designed to charge up a 1000µF capaci- tor to 12V in 34ms, with an inrush current of 350mA. This t1 t2 SLOPE = 0.35[V/ms] GATE OUT VDD + 6.15V VDD 4234 F02 Figure 2. Supply Turn-On ADC R1 226k C1 1µF R2 20k 12V 4234 F01 CT 0.1µF *TVS Z1: DIODES INC. SMAJ17A CL 680µF VOUT 12V 10A VDD Z1* UV OUT FB PG GND IMON RSET 20k RMON 20k ISET CGATE 0.1µF RGATE 100k GATE LTC4234 OV INTVCC TIMER SENSE– SENSE FLT + R3 140k R4 20k CCOMP 3.3nF R7 10k UV = 9.88V OV = 15.2V PG = 10.5V R6 20k R5 150k |
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