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BQ24100 Datasheet(PDF) 17 Page - Texas Instruments |
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BQ24100 Datasheet(HTML) 17 Page - Texas Instruments |
17 / 36 page www.ti.com Timer Fault Recovery Output Overvoltage Protection (Applies To All Versions) Functional Description for System-Controlled Version (bq2411x) Precharge And Fast-Charge Control Charge Termination And Safety Timers Inductor, Capacitor, and Sense Resistor Selection Guidelines f0 + 1 2p L OUT C OUT (7) bq24100, bq24103, bq24103A bq24105, bq24108, bq24109 bq24113, bq24113A, bq24115 SLUS606K – JUNE 2004 – REVISED NOVEMBER 2007 As shown in FIGURE 10, bqSWITCHER provides a recovery method to deal with timer fault conditions. The following summarizes this method. Condition 1 VI(BAT) above recharge threshold (VOREG - VRCH) and timeout fault occurs. Recovery method: bqSWITCHER waits for the battery voltage to fall below the recharge threshold. This could happen as a result of a load on the battery, self-discharge or battery removal. Once the battery falls below the recharge threshold, the bqSWITCHER clears the fault and enters the battery absent detection routine. A POR or CE toggle also clears the fault. Condition 2 Charge voltage below recharge threshold (VOREG – VRCH) and timeout fault occurs Recovery method: Under this scenario, the bqSWITCHER applies the IDETECT current. This small current is used to detect a battery removal condition and remains on as long as the battery voltage stays below the recharge threshold. If the battery voltage goes above the recharge threshold, then the bqSWITCHER disables the IDETECT current and executes the recovery method described in Condition 1. Once the battery falls below the recharge threshold, the bqSWITCHER clears the fault and enters the battery absent detection routine. A POR or CE toggle also clears the fault. The bqSWITCHER provides a built-in overvoltage protection to protect the device and other components against damages if the battery voltage gets too high, as when the battery is suddenly removed. When an overvoltage condition is detected, this feature turns off the PWM and STATx pins. The fault is cleared once VIBAT drops to the recharge threshold (VOREG – VRCH). For applications requiring charge management under the host system control, the bqSWITCHER (bq2411x) offers a number of control functions. The following section describes these functions. A low-level signal on the CMODE pin forces the bqSWITCHER to charge at the precharge rate set on the ISET2 pin. A high-level signal forces charge at fast-charge rate as set by the ISET1 pin. If the battery reaches the voltage regulation level, VOREG, the bqSWITCHER transitions to voltage regulation phase regardless of the status of the CMODE input. The charge timers and termination are disabled in the system-controlled versions of the bqSWITCHER. The host system can use the CE input to enable or disable charge. When an overvoltage condition is detected, the charger process stops, and all power FETs are turned off. The bqSWITCHER provides internal loop compensation. With this scheme, best stability occurs when LC resonant frequency, fo is approximately 16 kHz (8 kHz to 32 kHz). Equation 7 can be used to calculate the value of the output inductor and capacitor. Table 3 provides a summary of typical component values for various charge rates. Table 3. Output Components Summary CHARGE CURRENT 0.5 A 1 A 2 A Output inductor, LOUT 22 µH 10 µH 4.7 µH Output capacitor, COUT 4.7 µF 10 µF 22 µF (or 2 × 10 µH) ceramic Sense resistor, R(SNS) 0.2 Ω 0.1 Ω 0.05 Ω Copyright © 2004–2007, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Link(s): bq24100, bq24103, bq24103A bq24105, bq24108, bq24109 bq24113, bq24113A, bq24115 |
Similar Part No. - BQ24100_07 |
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Similar Description - BQ24100_07 |
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