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TPS658620ZQZT датащи(PDF) 37 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 37 Page - Texas Instruments |
37 / 104 page 3.21 OPERATING MODES TPS658620 Advanced Power Management Unit www.ti.com SLVS993 – OCTOBER 2009 Figure 3-6. Linear Charger Configured with SM2 as Pre-Regulator The TPS658620 supports charging of single-cell Li-Ion or Li-Pol battery packs. The charge process is executed in three phases: pre-charge (or pre-conditioning), constant current and constant voltage. Protection circuits reduce the charge current when the IC junction temperature exceeds 125 °C (typ, thermal loop), or when the SYS pin voltage drops below a user-selectable threshold (DPPM loop). When the charger is enabled, the control loops limit the BAT pin current to the programmed charge current value (charge current loop) or regulates the BAT pin voltage to the programmed charge voltage value (charge voltage loop). If V(BAT) < VLOWBAT, the BAT pin current is internally set to the programmed pre-charge current value. A typical charge profile is shown below, for an operation condition when the thermal and DPPM loops are not active. If the operating conditions cause the IC junction temperature to exceed 125 °C or the SYS pin voltage collapses, the charge cycle is modified, with the activation of additional control loops. The DPPM and thermal loops will override the other charger control loops and reduce the charge current. A modified charge cycle, with the thermal or DPPM loop active, is shown in Figure 3-7 and Figure 3-8. Submit Documentation Feedback DETAILED DESCRIPTION 37 |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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