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FSBB20CH60F Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FSBB20CH60F Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 16 page 11 www.fairchildsemi.com FSBB20CH60F Rev. D Note: 1. RC coupling at each input (parts shown dotted) might change depending on the PWM control scheme used in the application and the wiring impedance of the application’s printed circuit board. The SPM input signal section integrates 3.3k Ω(typ.) pull-down resistor. Therefore, when using an external filtering resistor, please pay attention to the sig- nal voltage drop at input terminal. 2. The logic input is compatible with standard CMOS or LSTTL outputs. Figure 9. Recommended CPU I/O Interface Circuit Note: 1. It would be recommended that the bootstrap diode, DBS, has soft and fast recovery characteristics. 2. The bootstrap resistor (RBS) should be 3 times greater than RE(H). The recommended value of RE(H) is 5.6Ω, but it can be increased up to 20Ω (maximum) for a slower dv/dt of high-side. 3. The ceramic capacitor placed between VCC-COM should be over 1µF and mounted as close to the pins of the SPM as possible. Figure 10. Recommended Bootstrap Operation Circuit and Parameters CPU CO M 5V-Line 1nF Ω 4.7k ,, IN (U L) IN (VL) IN (W L) ,, IN (UH ) IN (VH) IN (W H ) V FO Ω 100 1nF SPM R PF= C PF = 15V-Line 22uF 0.1uF 1000u F 1uF One-Leg Diagram of SPM Vcc IN COM VB HO VS Vcc IN COM OUT Inverter Output P N These Values depend on PWM Control Algorithm D BS R BS R E(H) V SL |
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