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TPS65562RGTRG4 Fiches technique(PDF) 7 Page - Texas Instruments |
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TPS65562RGTRG4 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 16 page www.ti.com PRINCIPLES OF OPERATION CHG (VOUT) XFULL F_ON G_IGBT (ENA) tim eA tim eB tim eC tim eD tim eE tim eF tim eG tim eH tim eI tim eJ Start/Stop Charging Indicate Charging Status TPS65562 SLVS775 – JUNE 2007 Figure 4. Whole Operation Sequence Chart TPS65562 has one internal enable latch, F1, that holds the charge enable (ON/OFF status) of the device (see Figure 4). The only way to start charging is to input CHG ↑ (see time A/C/H in Figure 4). Each time CHG↑ is applied, the TPS65562 starts charging. There are three trigger events to stop charging: 1. Forced stop by inputting CHG = L from the controller (see timeB in Figure 4). 2. Automatic stop by detecting a full charge. VOUT reaches the target value (see TimeD in Figure 4). 3. Protected stop by detecting an overcurrent function (OVDS) trigger at SW pin (see TimeI in Figure 4). When the charging operation is complete, the TPS65562 drives the charge completion indicator pin, XFULL, to GND. A controller can detect the status of the device as a logic signal when connected through a pullup resister, R1 (see Figure 1). The XFULL output enables the controller to detect the OVDS protection status. If OVDS protection occurs, XFULL never goes L during CHG = H. Therefore, the controller detects OVDS protection by measuring the time from CHG high to XFULL low. If the time to XFULL low is longer than the maximum designed charge time, then an OVDS protection occurred. The device starts charging at timeH, and OVDS protection occurs at TimeI (see Figure 5). At TimeI, XFULL stays H. At TimeJ, the controller detects OVDS protection through the expiration of a timer ends and then sets CHG to low to terminate the operation. 7 Submit Documentation Feedback |
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