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L6571A_0009 Datasheet(PDF) 4 Page - STMicroelectronics |
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L6571A_0009 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 8 page L6571A L6571B 4/8 OSCILLATOR FREQUENCY The frequency of the internal oscillator can be programmed using external resistor and capacitor. The nominal oscillator frequency can be calculated using the following equation: Where RF and CF are the external resistor and capacitor. The device can be driven in "shut down" condition keeping the CF pin close to GND, but some cares have to be taken: 1. When CF is to GND the high side driver is off and the low side is on 2. The forced discharge of the oscillator capacitor CF must not be shorter than 1us: a simple way to do this is to limit the current discharge with a resistive path imposing R · CF >1µs(see fig.1) Figure 1. Figure 2. Waveforms DC Duty Cycle, Ratio Between Dead Time + Conduction Time of High Side and Low Side Drivers 0.45 0.5 0.55 IAVE 1 Average Current from Vs No Load, fs = 60KHz 1.2 1.5 mA fout 6 Oscillation Frequency RT = 12K; CT = 1nF 57 60 63 kHz Symbol Pin Parameter Test Condition Min. Typ. Max. Unit f OSC 1 2R F C F In2 ⋅⋅ ⋅ ----------------------------------------- 1 1.3863 R F C F ⋅⋅ ------------------------------------------ == RF CF GNDM 1 2 3 4 8 7 6 5 fault signal R T1 TC VS VCF LVG D96IN434 VSUVP ELECTRICAL CHARACTERISTCS (continued) |
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