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TPS40009DGQG4 датащи(PDF) 11 Page - Texas Instruments |
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TPS40009DGQG4 датащи(HTML) 11 Page - Texas Instruments |
11 / 28 page TPS40007 TPS40009 SLUS589B− NOVEMBER 2003 − REVISED FEBRUARY 2005 11 www.ti.com APPLICATION INFORMATION SETTING THE CURRENT LIMIT Connecting a resistor from VDD to ILIM sets the current limit. A 15- µA current sink internal to the device causes a voltage drop at ILIM that becomes the short circuit threshold. Ensure that (VDD−0.8 V) ≤ VILIM ≤ VDD. The tolerance of the current sink is too loose to do an accurate current limit. The main purpose is for hard fault protection of the power switches. Given the tolerance of the ILIM sink current, and the RDS(on) range for a MOSFET, it is generally possible to apply a load that thermally damages the converter. This device is intended for embedded converters where load characteristics are defined and can be controlled. A local capacitor (with a value 50 pF to 150 pF) placed across the resistor between VDD and ILIM may improve coupling a common mode noise between VDD and ILIM. SOFT-START AND SHUTDOWN These two functions are combined on the SS/SD pin. There is a VBE offset (0.65-V) between the external SS/SD pin and internal soft-start voltage at the error amplifier input, allowing the device to be enabled before starting VOUT as shown in Figure 5. This reduces the transient current required to charge the output capacitor at startup, and allows for a smooth startup with no overshoot of the output voltage. t − Time − 1 ms/div FB (200 mV/ div) SS/SD (200 mV/ div) Figure 5. Offset Between SS/SD and FB at Startup |
Аналогичный номер детали - TPS40009DGQG4 |
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Аналогичное описание - TPS40009DGQG4 |
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