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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS2556 датащи(PDF) 11 Page - Texas Instruments |
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TPS2556 датащи(HTML) 11 Page - Texas Instruments |
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11 / 23 page  0.947 ILIM 1.0028 ILIM 1.0708 ILIM 99038V OSmax R k 111704V OSnom R k 127981V OSmin R k I (mA) = I (mA) = I (mA) = W W W 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 20 30 40 50 60 70 80 90 100 110 120 130 140 150 R – CurrentLimitResistor – k ILIM IOS(min) IOS(typ) IOS(max) 1.0708 ILIM OSmin 127981V OSmin R k 1 1.0708 ILIM OSmin ILIM I (mA) = 3000mA I (mA) = 127981V R (k ) = I mA R (k ) = 33.3k W W W W æ ö÷ ç ÷ ç ÷ ç ÷ çè ø TPS2556 TPS2557 www.ti.com SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 PROGRAMMING THE CURRENT-LIMIT THRESHOLD The overcurrent threshold is user programmable via an external resistor. The TPS2556/57 uses an internal regulation loop to provide a regulated voltage on the ILIM pin. The current-limit threshold is proportional to the current sourced out of ILIM. The recommended 1% resistor range for RILIM is 20 kΩ ≤ RILIM ≤ 187 kΩ to ensure stability of the internal regulation loop. Many applications require that the minimum current limit is above a certain current level or that the maximum current limit is below a certain current level, so it is important to consider the tolerance of the overcurrent threshold when selecting a value for RILIM. The following equations approximate the resulting overcurrent threshold for a given external resistor value RILIM). Consult the Electrical Characteristics table for specific current limit settings. The traces routing the RILIM resistor to the TPS2556/57 should be as short as possible to reduce parasitic effects on the current-limit accuracy. (1) Figure 19. Current-Limit Threshold vs. RILIM APPLICATION 1: DESIGNING ABOVE A MINIMUM CURRENT LIMIT Some applications require that current limiting cannot occur below a certain threshold. For this example, assume that 3 A must be delivered to the load so that the minimum desired current-limit threshold is 3000 mA. Use the IOS equations and Figure 19 to select RILIM. (2) Select the closest 1% resistor less than the calculated value: RILIM = 33.2 kΩ. This sets the minimum current-limit threshold at 3000 mA . Use the IOS equations, Figure 19, and the previously calculated value for RILIM to calculate the maximum resulting current-limit threshold. Copyright © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS2556 TPS2557 |
Аналогичный номер детали - TPS2556 |
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Аналогичное описание - TPS2556 |
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