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MAX712CSE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX712CSE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 17 page NiCd/NiMH Battery Fast-Charge Controllers _______________________________________________________________________________________ 9 The MAX712/MAX713 can be configured so that voltage slope and/or battery temperature detects full charge. Figure 4 shows a charging event in which a battery is inserted into an already powered-up MAX712/MAX713. During time 1, the charger’s output voltage is regulated at the number of cells times VLIMIT. Upon insertion of the battery (time 2), the MAX712/MAX713 detect cur- rent flow into the battery and switch to fast-charge state. Once full charge is detected, the device reverts to trickle charge (time 3). If the battery is removed (time 4), the MAX712/MAX713 remain in trickle charge and the output voltage is once again regulated as in time 1. Powering the MAX712/MAX713 AC-to-DC wall-cube adapters typically consist of a trans- former, a full-wave bridge rectifier, and a capacitor. Figures 10–12 show the characteristics of three con- sumer product wall cubes. All three exhibit substantial 120Hz output voltage ripple. When choosing an adapter for use with the MAX712/MAX713, make sure the lowest wall-cube voltage level during fast charge and full load is at least 1.5V higher (2V for switch mode) than the maxi- mum battery voltage while being fast charged. Typically, the voltage on the battery pack is higher during a fast- charge cycle than while in trickle charge or while supply- ing a load. The voltage across some battery packs may approach 1.9V/cell. 2N3904 D1 Q1 V+ DRV DC IN R1 R2 MAX712 MAX713 Figure 5. DRV Pin Cascode Connection (for high DC IN voltage or to reduce MAX712/MAX713 power dissipation in linear mode) ↑ 1 x UNDER_VOLTAGE IIN N_ _R RE EG GU UL LA AT TIIO ON N 0 x x ↑ x x P PO OW WE ER R_ _O ON N_ _R RE ES SE ET T ↑ x 1 ↑ 0 0 ↑ x x 1 0 0 1 0 0 1 0 ↓ 1 ↓ 0 1 0 0 1 0 0 1 x x 1 x x 1 0 ↑ 1 ↑ 0 Table 4. MAX712/MAX713 Charge-State Transition Table† x C CO OL LD D x 0 x 1 x ↓ 1 1 1 ↑ 1 x 0 x x x H HO OT T x x x 1 0 1 1 1 1 1 ↑ 0 x x x No change RESULT* Set trickle No change No change Set fast No change*** No change No change Set fast Set fast Set fast** No change*** Trickle to fast transition inhibited Trickle to fast transition inhibited Set trickle Set trickle 1 x x x ↓ Set trickle † Only two states exist: fast charge and trickle charge. * Regardless of the status of the other logic lines, a timeout or a voltage-slope detection will set trickle charge. ** If the battery is cold at power-up, the first rising edge on COLD will trigger fast charge; however, a second rising edge will have no effect. *** Batteries that are too hot when inserted (or when circuit is powered up) will not enter fast charge until they cool and power is recycled. |
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