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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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IRL3103S 데이터시트(PDF) 5 Page - International Rectifier |
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IRL3103S 데이터시트(HTML) 5 Page - International Rectifier |
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5 / 17 page  IRU3007 5 Rev. 2.1 08/20/02 www.irf.com This pin provides the feedback for the non-synchronous switching regulator. A resistor divider is connected from this pin to VOUT2 and ground that sets the output voltage. The value of the resistor connected from VOUT2 to Fb2 must be less than 100 V. 5V supply voltage. A high frequency capacitor (0.1 to 1 mF) must be placed close to this pin and connected from this pin to the ground plane for noise free operation. This pin provides the soft-start for the 2 switching regulators. An internal resistor charges an external capacitor that is connected from 5V supply to this pin which ramps up the outputs of the switching regulators, preventing the outputs from overshooting as well as limiting the input current. The second function of the Soft-Start cap is to provide long off time (HICCUP) for the synchronous MOSFET during current limiting. This pin has dual function. It acts as an output of the OVP circuitry or it can be used to program the frequency using an external resistor. When used as a fault detector, if any of the switcher outputs exceed the OVP trip point, the Fault pin switches to 12V and the soft-start cap is discharged. If the Fault pin is to be connected to any external circuitry, it needs to be buffered as shown in the application circuit. This pin provides the feedback for the internal LDO regulator that its output is VOUT4. This pin is connected to the output of the I/O switching regulator. It is an input that provides sensing for the Under/Over-voltage circuitry for the I/O supply as well as the power for the internal LDO regulator. This pin is the output of the internal LDO regulator. This pin serves as the ground pin and must be connected directly to the ground plane. This pin controls the gate of an external transistor for the 1.5V GTL+ linear regulator. This pin provides the feedback for the linear regulator that its output drive is Gate3. No connection. This pin provides the feedback for the synchronous switching regulator. Typically this pin can be connected directly to the output of the switching regulator. However, a resistor divider is recommended to be connected from this pin to VOUT1 and ground to adjust the output voltage for any drop in the output voltage that is caused by the trace resistance. The value of the resistor connected from VOUT1 to Fb1 must be less than 100 V. This pin is internally connected to the undervoltage and overvoltage comparators sensing the Vcore status. It must be connected directly to the Vcore supply. This pin is connected to the Drain of the power MOSFET of the Core supply and it provides the positive sensing for the internal current sensing circuitry. An external resis- tor programs the CS threshold depending on the RDS of the power MOSFET. An external capacitor is placed in parallel with the programming resistor to provide high frequency noise filtering. This pin serves as the Power ground pin and must be connected directly to the ground plane close to the source of the synchronous MOSFET. A high frequency capacitor (typically 1 mF) must be connected from V12 pin to this pin for noise free operation. Output driver for the synchronous power MOSFET for the Core supply. This pin is connected to the Source of the power MOSFET for the Core supply and it provides the negative sensing for the internal current sensing circuitry. Output driver for the high-side power MOSFET for the Core supply. This pin is connected to the 12V supply and serves as the power Vcc pin for the output drivers. A high frequency capacitor (typically 1 mF) must be placed close to this pin and PGnd pin and be connected directly from this pin to the ground plane for noise free operation. PIN# PIN SYMBOL PIN DESCRIPTION 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Fb2 V5 SS Fault / Rt Fb4 VSEN2 VOUT4 Gnd Gate3 Fb3 NC Fb1 VSEN1 OCSet1 PGnd LGate1 Phase1 UGate1 V12 |
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유사한 설명 - IRL3103S |
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