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L9945 データシート(PDF) 38 Page - STMicroelectronics |
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L9945 データシート(HTML) 38 Page - STMicroelectronics |
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38 / 144 page  Figure 19. Possible faults in peak & hold configuration GADG2802171105PS BATT12 HS NMOS LS NMOS DRN1 VBATT GNSP1 SNGP1 RG RPD CM RM M1 RSH GND DFW CBATT DRN4 GNSP4 SNGP4 RG RPD CM RM M1 RSH DZFB DFB PGND34 GND GND CEMI GND OUT4 OUT1 STB OL OL STG SCL STB STG CEMI RFB VBATT BATT34 5.7 Internal oscillator The device has an internal oscillator providing the timing and control for all device operating functions. The nominal clock frequency is 10 MHz. The oscillator is functional when VDD5 > VPOR. 5.7.1 Spread spectrum In order to minimize the noise generated by the internal clock signal, the device offers the spread spectrum functionality. Such feature is disabled by default and can be activated by programming the spread_spectrum bit. 5.7.2 Internal oscillator electrical characteristics The table below reports the detailed electrical characteristics of the internal oscillator. Note: Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V, unless otherwise noted. L9945 Functional description DS12275 - Rev 10 page 38/144 |
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