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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658620ZQZT датащи(PDF) 60 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 60 Page - Texas Instruments |
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60 / 104 page  3.55.3 PFM MODE OPERATION (VIN_SMx) PFM(ENTER) V I = 34W (3-4) 3.55.4 SETTING THE PWM/PFM MODE TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com Figure 3-16. PWM Control The TPS658620 SM0, SM1 and SM2 buck converters can be set to operate only in PWM mode or to switch automatically between PFM and PWM modes, via the I2C interface. While in the Pulsed Frequency Mode the converters operate with reduced switching frequency and with a minimum quiescent current to maintain high efficiency. In PFM mode the converter will regulate the output voltage to 1% above the nominal output voltage. To determine when to transition between the modes, the inductor current is monitored, and the PFM mode is set when the inductor ripple current approaches zero. For duty cycles above 85% the PFM mode is entered for load currents below the threshold IPFM(ENTER). In PFM mode the output voltage is monitored by a voltage comparator, which regulates the output voltage to the programmed value VO(SM1). If the output voltage is below VO(SM1) the PFM control circuit turns on the power stage, applying a burst of pulses to increase the output voltage. When the output voltage exceeds the target regulation voltage VO(SM1) the power stage is disabled, and the output voltage will drop until it is below the regulation voltage target, when the power stage is enabled again. The PFM operation is disabled and PWM operation set if one of the following events happens during PFM operation: 1. The burst operation exceeds 7 µs, typ. 2. The output voltage falls below 3% of the target regulation voltage in PFM mode (2% of the nominal output voltage in PWM mode) In TPS658620 the PWM mode can be forced for each converter by setting the bit SMn_PWM to 1 in the SMODE1 register. If bits SMn_GPIO is 1, the GPIO will control the PWM or PFM mode setting, and bits SMn_PWM are ignored. DETAILED DESCRIPTION 60 Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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