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MC33567D-2 bảng dữ liệu(PDF) 5 Page - ON Semiconductor |
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MC33567D-2 bảng dữ liệu(HTML) 5 Page - ON Semiconductor |
5 / 12 page MC33567 http://onsemi.com 5 Sense: If the load is located away from the regulator, the voltage drop on the connecting cable or trace can become significant. The MC33567 provides tight voltage load regulation with varying load currents using it’s SENSE feature. As shown in Figure 5, the MC33567 senses the voltage at the load and provides feedback to the regulator. The regulator voltage is then adjusted to compensate for the load changes. It is recommended that the SENSE connection be placed as close as possible to the load. Also, use a separate trace to connect the source of the N−channel MOSFET to the load to avoid interference or coupling with the SENSE signal. The use of the SENSE feature is required for correct device operation. If the SENSE pin is not connected to the load, the output will go into Hiccup mode. The current into the SENSE pin is given by the following equation: ISENSE + 100 mA ) Vout 1.8 k W Figure 5. Voltage Regulation Using Sense Feature SENSE Vin RL DRV Feedback to Regulator 1.8 k W VOUT + − 100 mAISENSE N−Channel MOSFET Selection: The MC33567 was characterized using ON Semiconductor’s MTD3055VL N−channel MOSFET. Other MOSFETs can be used with the MC33567 as long as power and stability requirements are met. Power: A MOSFET with a low drain−source on resistance (RDS(on)) will insure the output voltage is not drastically reduced due to excessive voltage drop across the MOSFET. The required RDS(on) can be calculated using the equation below: RDS(on) v 0.5 Vin * Vout ILOAD where: Vin = Input Voltage, typically 3.3 V Vout = Regulator Output Voltage (1.2 V, 1.515 V, 1.818 V, 2.3 V, or 2.525 V) ILOAD= Load Current A safety margin of 0.5 was added to account for RDS(on) variations over the operating temperature range. Stability: After evaluating the regulator, driver and load system using control theory it is demonstrated that the output capacitor, external driver gain and error amplifier gain bandwidth play an important role on the system stability. To insure system stability the following set of design guidelines should be followed: Ci + Cgs ) Cgd wf + 1 Ci ·Ro wp + 1 w1 ) 1 wf *1 1 20 · 1 ) wa (3 · wp) · 1 gm v Rs v (3 · wp) wa · 1 gm Co ·Rs w 5· 1 wa ) 1 wp where: wf = Driver pole frequency Ci = Input and reverse transfer capacitance when device is off Ro = Regulator output resistance (50 W for the MC33567) wp = Secondary pole for open loop wa = Error amplifier gain bandwidth w1 = Error amp second pole (set w1 = wa, if not specified) Rs = Output capacitor ESR gm = Maximum driver transconductance gain Co = Output capacitance T = Overall loop response time |
Số phần tương tự - MC33567D-2 |
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Mô tả tương tự - MC33567D-2 |
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