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TEA1506T Datenblatt(PDF) 7 Page - NXP Semiconductors |
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TEA1506T Datenblatt(HTML) 7 Page - NXP Semiconductors |
7 / 22 page 2003 Sep 09 7 Philips Semiconductors Product specification GreenChip ™II SMPS control IC TEA1506P; TEA1506AP; TEA1506T; TEA1506AT Cycle skipping At very low power levels, a cycle skipping mode will be activated. A high control voltage will reduce the switching frequency to a minimum of 25 kHz. If the voltage on the control pin is raised even more, switch-on of the external power MOSFET will be inhibited until the voltage on the control pin has dropped to a lower value again (see Fig.8). For system accuracy, it is not the absolute voltage on the control pin that will trigger the cycle skipping mode, but a signal derived from the internal VCO will be used. Remark: If the no-load requirement of the system is such that the output voltage can be regulated to its intended level at a switching frequency of 25 kHz or above, the cycle skipping mode will not be activated. handbook, halfpage Vsense(max) (V) MGU509 f (kHz) 25 175 175 kHz VCO2 level VCO1 level Fig.7 VCO frequency as function of Vsense(max). handbook, full pagewidth MGU510 1.5 V − VCTRL Isense fosc fmax fmin Vx (mV) CTRL current comparator cycle skipping X2 V I 1 0 Vx 150 mV OSCILLATOR DRIVER DRIVER Vx (mV) dV2 dV1 150 Fig.8 The cycle skipping circuitry. The voltage levels dV1 and dV2 are fixed in the IC to 50 mV (typical) and 18 mV (typical) respectively. |
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