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TPS65040 Datasheet(PDF) 47 Page - Texas Instruments |
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TPS65040 Datasheet(HTML) 47 Page - Texas Instruments |
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47 / 72 page  VOUT 5usec(typ) Ifthecurrentlimitprotectioncircuit doesnotdetectduring5usec,itshifts tonomaloperationmode. NomalOperation Mode Current Limit4A Current Limit1.5A CoilCurrent 0A 0V PABIAS1 0V CurrentLimit 1.5A detectionMode 5usec(typ) 1.5A detectcontinuously 1.5A detectionstart (c)1.5 A Detection Short-Circuit Protection TPS65040 SLVS708 – NOVEMBER 2006 Figure 74. Current Limit Protection - View (c) The DC/DC converter incorporates short-circuit protection (SCP) in addition to current-limit protection (CLP) circuitry. The current-limit protection circuit applies to the peak current detection of the coil, while the short-circuit protection circuit detects the level of the output voltage. Figure 75 (a) shows the operation of short-circuit protection. The output voltage of VOUT decreases when current-limit operates, limiting the current through the coil. Short-circuit protection occurs when 80% or less of the target output voltage value is detected while in the normal operation mode, thereby shifting from normal operation mode to SCP monitor mode. An internal oscillator provides the timing for a 0.5msec (typ) delay before shifting to SCP-monitor mode. The two protection circuits (current-limit protection and short-crcuit protection) operate in this manner, shifting to SCP mode when the output voltage of VOUT does not exceed the target value for 0.5msec (typ), even if passing, and the VOUT pin is adjusted to 0V for 8msec (typ). The analog circuit of the DC/DC converter is enabled for the 8-msec (typ) period, after which the DC/DC converter powers up from soft-start mode. If the output voltage of VOUT exceeds 80% of the target value after soft-start mode ends, it operates in normal operation mode. The short-circuit protection circuit continuously monitors the output voltage value of VOUT. It transitions from soft-start mode to normal-operation mode once, after power up, as shown in Figure 75 (b), and then if the output voltage of VOUT does not achieve 80% of the target output voltage, it again shifts to SCP-monitor mode. It shifts to SCP mode when the output voltage of VOUT does not exceed the target value for 0.5msec (typ), even if passing, and the VOUT pin is adjusted to 0V for 8msec (typ). The DC/DC converter keeps repeating this intermittent operation as long as there is no setting change from the host. Figure 75 (c) shows the image chart for intermittent operation. Note that the detection time is counted by an internal oscillator, which generates the switching frequency (fs) of the DC/DC converter. 47 Submit Documentation Feedback |
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