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TPA3244D2 Scheda tecnica(PDF) 9 Page - Texas Instruments |
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TPA3244D2 Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 31 page I_OC ROC_ADJ IOC_max IOC_min Not Defined HS PWM PWM_X LS PWM OC EVENT RESETS CB3C LATCH OUTPUT CURRENT OC THRESHOLD OCH HS GATE-DRIVE LS GATE-DRIVE RISING EDGE PWM SETS CB3C LATCH 9 TPA3244 www.ti.com SLASEC6 – APRIL 2016 Product Folder Links: TPA3244 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated and a drop of real speaker’s load impedance, and allows the output current to be limited to a maximum programmed level. If the maximum output current persists, i.e. the power stage being overloaded with too low load impedance, the device will shut down the affected output channel and the affected output is put in a high- impedance (Hi- Z) state until a RESET cycle is initiated. CB3C works individually for each half bridge output. If an over current event is triggered, CB3C performs a state flip of the half bridge output that is cleared upon beginning of next PWM frame. Figure 4. CB3C Timing Example During CB3C an over load counter increments for each over current event and decrease for each non-over current PWM cycle. This allows full amplitude transients into a low speaker impedance without a shutdown protection action. In the event of a short circuit condition, the over current protection limits the output current by the CB3C operation and eventually shut down the affected output if the overload counter reaches its maximum value. If a latched OC operation is required such that the device shuts down the affected output immediately upon first detected over current event, this protection mode should be selected. The over current threshold and mode (CB3C or Latched OC) is programmed by the OC_ADJ resistor value. The OC_ADJ resistor needs to be within its intentional value range for either CB3C operation or Latched OC operation. Figure 5. OC Threshold versus OC_ADJ Resistor Value Example OC_ADJ values outside specified value range for either CB3C or latched OC operation will result in minimum OC threshold. |
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