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RT9541FCE Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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RT9541FCE Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 8 page  RT9541 Preliminary www.richtek-ic.com.tw DS9541-05 August 2001 4 Applications Information (1) Operation Description Refering to the “Function Block Diagram”, when charging voltage crosses the detector threshold from a low value to a value higher than VDET1, the output of COUT pin, the output of over-charge detector/VD1, swiches to low level,..charger’s negative pin level. After detecting over-charge the VD1 can be reset and the output of COUT pin becomes “H” when the VDD voltage is coming down to a level lower than “VDET1 – VHYS1”, or when a charger is disconnected from the battery pack. The output of DOUT pin, the output of over-discharge detector/VD2, switches to “L” after internally fixed delay time passed, when discharging voltage crosses the detector threshold from a high value to a value lower than VDET2. An excess load current can be sensed and cut off after internally fixed delay time passsed through the built in excess current detector, VD3, with DOUT being enabled to low level. Once after detecting excess current, the VD3 is released and DOUT level switches to “H” by detaching a battery pack from a load system. Futher, short circuit protector makes DOUT level to “L” immediately with external short circuit current and removing external short circuit leads DOUT level to “H”. The excess charging current is also monitored, and the charging path will be cut off (by turn low COUT) after excess charging current was detected lasting a internally fixed delay time. The charging path will be re-started (by turn high COUT) after another internally fixed delay. If the excess charging current is still there, the same process will be repeated and cause the charging path toggling on and off with a 12.5% on duty. Such a protection function reduces the average charging current to 12.5% of original value when excess charging current detected. The short circuit protection function in charging direction was also provided. When COUT high and the “V-“ pin voltage 5V lower than VSS pin, the RT9541 will turn low COUT with a fixed delay. The COUT will go high after the short circuit condition was removed. After detecting over-discharge, supply current will be kept extremely low by halting some internal circuits operation. The output delay of over-charge detectors can be set by connecting an external capacitor. Output type of COUT and DOUT are CMOS. (2) Component Selection Guide: Referring to “Typical Application Circuit”, R1 and C1 will stabilize a supply voltage to the RT9541. A recommended R1 value is less than 1kΩ. A larger value of R1 leads higher detection voltage, makes some errors, because of shoot through current flowed in the RT9541. R2 and C2 will stabilize a V- pin voltage. The resetting from over-discharge with connecting charger possibly be disabled by larger value of R2. Recommended value is less than 1kΩ. And recommended C2 value is less than 1 µF. R1 and R2 can operate as a current limiter against setting cell reverse direction or for applying excess charging voltage to the RT9541. While smaller R1 and R2 may cause an over power dissipation rating of the RT9541 and a total of “R1+R2” should be more than 1kΩ. |
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