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LTM8056 Datasheet(PDF) 14 Page - Linear Technology |
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LTM8056 Datasheet(HTML) 14 Page - Linear Technology |
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14 / 28 page  LTM8056 14 8056fa For more information www.linear.com/LTM8056 above information and the circuit shown in Figure 2, the VIN rising (turn-on) threshold is: VIN = 3µA •R1 ( )+1.225V R1+R2 R2 and the VIN falling turn-off threshold is: VIN =1.2 R1+R2 R2 when the voltage VOUT-IOUT reaches 58mV. The current limit is: IOUT(LIM) = 58mV RSENSE where RSENSE is the value of the sense resistor in ohms. Most applications should use an output sense resistor as shown in Figure 3, if practical. The internal buck-boost power stage is current limited, but is nonetheless capable of delivering large amounts of current in an overload condition, especially when the output voltage is much lower than the input and the power stage is operating as a buck converter. APPLICATIONS INFORMATION RUN LTM8056 VIN R1 R2 8056 F02 Figure 2. This Simple Resistor Network Sets the Minimum Operating Input Voltage Threshold with Hysteresis IOUT LTM8056 VOUT RSENSE 8056 F03 LOAD Figure 3. Set The LTM8056 Output Current Limit with an External Sense Resistor Minimum Input Voltage and SVIN The minimum input voltage of the LTM8056 is 5V, but this is only if VIN and SVIN are tied to the same voltage source. If SVIN is powered from a power source at or above 5VDC, VIN can be allowed to fall below 5V and the LTM8056 can still operate properly. Some examples of this are provided in the Typical Applications section. Soft-Start Soft-startreducestheinputpowersources’surgecurrents bygraduallyincreasingthecontroller’scurrent.Asindicated in the Block Diagram, the LTM8056 has an internal soft- start RC network. Depending upon the load and operating conditions, the internal network may be sufficient for the application. To increase the soft-start time, simply add a capacitor from SS to GND. Output Current Limit (IOUT) The LTM8056 features an accurate average output current limit set by an external sense resistor placed between VOUT and IOUT as shown in Figure 3. VOUT and IOUT internally connect to a differential amplifier that limits the current When the voltage across the output sense resistor falls to about 1/10th of full scale, the LL pin pulls low. If there is no output sense resistor, and IOUT is tied to VOUT, LL will be active low. Applying an output sense resistor and tying the LL and MODE pins together can improve perfor- mance—see Switching Mode in this section. In high step-down voltage regulator applications, the internal current limit can be quite high to allow proper operation. This can potentially damage the LTM8056 in overload or short-circuit conditions. Apply an output current sense resistor to set an appropriate current limit to protect the LTM8056 against these fault conditions. Output Current Limit Control (CTL) Use the CTL input to reduce the output current limit from thevaluesetbytheexternalsenseresistorappliedbetween VOUT and IOUT. The typical control range is between 0V and 1.2V. The CTL pin does not directly affect the input |
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