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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TEA1200TS датащи(PDF) 6 Page - NXP Semiconductors |
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TEA1200TS датащи(HTML) 6 Page - NXP Semiconductors |
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6 / 24 page  2002 May 14 6 Philips Semiconductors Product specification 0.95 V starting DC-to-DC converter with low battery indicator TEA1200TS When the output voltage becomes lower than the low limit of the window, a corrective action is taken by a ramp-up of the inductor current during a much longer time. As a result, the DC current level is increased and normal PWM control can continue. The output voltage (including ESR effect) is again within the predefined window. Figure 4 shows the spread of the output voltage window. The absolute value is mostly dependent on spread, while the actual window size [Vwdw(high) − Vwdw(low)] is not affected. For one specific device, the output voltage will not vary more than 2% (typical value). In low output power situations, the TEA1200TS will switch over to PFM operating mode. In this mode, regulation information from an earlier PWM operating mode is used. This results in optimum inductor peak current levels in the PFM mode, which are slightly larger than the inductor ripple current in the PWM mode. As a result, the transition between PFM and PWM mode is optimum under all circumstances. In the PFM mode the TEA1200TS regulates the output voltage to the high window limit as shown in Fig.3. handbook, full pagewidth MGK925 start corrective action load increase high window limit low window limit Vo IL time time Fig.3 Response to load increase. |
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