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MC33567D-3 数据表(PDF) 6 Page - ON Semiconductor |
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MC33567D-3 数据表(HTML) 6 Page - ON Semiconductor |
6 / 12 page MC33567 http://onsemi.com 6 The output capacitor capacitance and ESR required for using the MTD3055VL as external driver are calculated as follows: wf + 1 Ci ·Ro + 1 (1240 pF ) 600 pF) · (50 W) + 10.87 MHz wp + 1 w1 ) 1 wf *1 + 1 5MHz ) 1 10.87 MHz *1 + 3.42 MHz 1 20 · 1 ) wa (3 · wp) · 1 gm v Rs v (3 · wp) wa · 1 gm 1 20 · 1 ) 5MHz (3 · 3.42 MHz) · 1 8.8 mhos v Rs v (3 · 3.42 MHz) 5MHz · 1 8.8 mhos 3.8 m W v Rs v 233.2 mW selecting an ESR of 30 m W, we have: Co w 5 Rs · 1 wa ) 1 wp Co w 5 30 m W · 1 5MHz ) 1 3.42 MHz Co w 82.07 mF 100 µF is selected as it is an industry standard value. Please note that if the system is designed to work with several drivers, the system has to be designed around the driver with higher gain to insure stability for all of them. The design guidelines discussed in this section are conservative enough that satisfactory results may be obtained with devices that lie just outside of these guidelines, although deviation from these guidelines will generally cause instability. For a more detailed analysis on linear regulators stability please refer to ON Semiconductor application note AND8037/D. Adjustable Output Voltage: The MC33567 will regulate Vout to its preset voltage level, referenced at the sense pin. However, other Vout levels can be obtained scaling the sense voltage. This is done using a resistive network between the load and the sense pin as shown in Figure 6. Figure 6. Output Voltage Scaling Using Resistive Network SENSE Vin R2 DRV RINT + Vout(new) − + Vout − R1 ISENSE 1.8 k W The regulator will increase the load voltage until the SENSE pin voltage reaches the regulator voltage level, Vout. The new output voltage, Vout(new), is calculated as follows: Vout(new) + Vout ) R1 * Vout R2 ) ISENSE Please note that in this configuration R2 and the sense internal resistor are in parallel. The parallel combination will reduce the effective resistance of R2. If R2 is in the range of RINT, the parallel combination will be almost half of the original intended value of R2. This will cause Vout(new) to be smaller than calculated using the above equation. This is avoided making R2 as small as possible, probably in the range of 10 to 50 Ohms. Vout(new) is limited by the external driver drain current and its required Gate−Source voltage as well as the Drive Output Voltage, Vdrv. PCB Layout Guidelines It is recommended that the MC33567 be placed as physically close as possible to the external series pass MOSFET transistors. Use short traces to minimize extraneous signals from being induced on the SENSE or DRV line. Also, avoid routing the SENSE line near the load and input current path, as well as the GND return current path to prevent signal coupling. |
类似零件编号 - MC33567D-3 |
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类似说明 - MC33567D-3 |
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