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XC8109 Datasheet(PDF) 10 Page - Torex Semiconductor |
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XC8109 Datasheet(HTML) 10 Page - Torex Semiconductor |
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10 / 26 page  10/26 XC8109 Series ■ OPERATIONAL EXPLANATION (Continued) <Current limiter, short-circuit protection> When the output current reaches the current limit value, the constant current limit circuit activates and as a result, the output voltage goes down. If the short circuit comes at the VOUT pin, the output current is limited to the current which is specified as the short-circuit current value. In over-current states, after output voltage drops and the situation is kept for 7.5ms (TYP.), the FLG pin changes to Low level output. Two types are available for the current limiter circuit: an auto recovery type (product type C) and a latch off type (product type D). After the current limiter circuit activates and the FLG pin outputs low level, the operation is different between these two types. The auto recovery type continuously limits the output current by the current limit value. In over-current states, after output voltage returns to normal and the situation is kept for 7.5ms (TYP.), the voltage of FLG pin goes up “H” level again. The latch off type turns off the power switch transistor after the FLG pin outputs Low level. The off state is maintained regardless of whether the over-current state is released. Latch operation is released by turning off the IC with the CE pin signal and then restarting, or by lowering the input voltage below the UVLO detected voltage once and after that raising it higher than UVLO released voltage. <Current limit external adjustment function> By connecting a resistor to the current limit external adjustment pin (ILIM pin), the current limit can be set to any value. By the following equations, the current limit value can be set to any value within a range of 75mA to 1300mA. When the ILIM pin is open, the switch transistor is forcibly turned off. (In the case of ILIMIT(T)≧500mA.) equation 1. RILIM(kΩ) = 32164 / ILIMIT(T)(mA) – 25.71(kΩ) (In the case of ILIMIT(T)＜500mA.) equation 2. RILIM(kΩ) = 130170 / ILIMIT(T)(mA) 1.2814(kΩ) RILIM: External resistance value ILIMIT(T): Current limit set value Table1. Current limit set value ILIMIT(T) (mA) RILIM (kΩ) E96 External resistance value (kΩ) Current limit value when use E96 external resistance (mA)(*) MIN. TYP. MAX. 75 515 511 49 75 102 100 356 357 69 100 131 200 147 147 156 200 243 300 87.2 86.6 241 302 362 400 60.3 60.4 314 399 485 500 38.6 38.3 427 503 578 600 27.9 28.0 509 599 689 700 20.2 20.0 598 704 809 800 14.5 14.7 716 796 876 900 10.0 10.0 811 901 991 1000 6.46 6.49 899 999 1099 1100 3.53 3.57 989 1099 1208 1200 1.09 1.10 1080 1200 1320 1300 ILIM shorted to VSS 1170 1300 1430 (*) MIN. value and MAX. value are reference values. |
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