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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) 67 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 67 Page - Texas Instruments |
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67 / 104 page  3.57.1 SM3 RAM REGISTERS TPS658620 Advanced Power Management Unit www.ti.com SLVS993 – OCTOBER 2009 As the integrated power switch is turned off the external Schottky diode is forward biased, delivering the stored inductor energy to the output. The main switch remains off until the FB3 pin voltage is below the internal 250mV reference voltage, when it is turned on again. This PFM peak current control sets the converter in discontinuous conduction mode (DCM), and the switching frequency depends on the inductor, input/output voltage and LED current. Lower LED currents reduce the switching frequency, with high efficiency over the entire LED current range. This regulation scheme is inherently stable, allowing a wide range for the selection of the inductor and output capacitor. Table 3-39. SM3 Control SM3_SET0 [Addr 0x57] Defaults in BOLD Bit Number B7 B6 B5 B4 B3 B2 B1 B0 Bit Name SM3_SET7 SM3_SET6 SM3_SET5 SM3_SET4 SM3_SET3 SM3_SET2 SM3_SET1 SM3_SET0 Function SM3 PWM SWITCH DUTY CYCLE When 0 ADD 0 TO DUTY CYCLE When 1 ADD 6.25% ADD 3.125% ADD 1.5625% ADD 0.78125% ADD 0.390% ADD 0.195% ADD 0.0976% ADD 0.048% SM3_SET1 [Addr 0x58] Defaults in BOLD Bit Number B7 B6 B5 B4 B3 B2 B1 B0 Bit Name SM3SOFTOFF SM3_ILIM SM3_PRESC1 SM3_PRESC0 SM3_IGAIN SM3_SET10 SM3_SET9 SM3_SET8 SM3 SM3PWM SM3PWM ISM3G SOFTSTART Function CURRENT REPETITION REPETITION OUTPUTBUFF SM3 PWM DUTY CYCLE ENABLE LIMIT RATE[1] RATE[0] ER MODE SEE SM3 PWM REPETITION When 0 ENABLED 300 mA Hi-Z ADD 0 TO DUTY CYCLE TABLE SEE SM3 PWM REPETITION When 1 DISABLED 500 mA LO ADD 50% ADD 25% ADD 12.5% TABLE Table 3-40. SM3 PWM Repetition Settings SM3PRESC[1] SM3PRESC[0] REPETITION RATE (Hz) 0 0 550 0 1 366 1 0 275 1 1 220 The internal LED switch, in series with the external LED’s, disconnects the LEDs from ground during shutdown. In addition, the LED switch is driven by a PWM signal generated internally, enabling adjusting the average LED current by setting the LED switch duty cycle. The duty cycle is adjusted with control bits SM3_SET, on register SM3_SET0. With this control method the LED brightness depends on the LED switch duty cycle only and is independent of the boost converter operating frequency. The duty cycle control used in the SM3 converter LED switch is implemented by a single PWM pulse with a fixed repetition rate. An example of distinct duty cycles is shown IN Figure 3-19 Submit Documentation Feedback DETAILED DESCRIPTION 67 |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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