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TPS92511 Datasheet(PDF) 12 Page - Texas Instruments |
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TPS92511 Datasheet(HTML) 12 Page - Texas Instruments |
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12 / 31 page  A R 1500 I IADJ LED 50 100 150 200 250 300 350 400 450 500 20 40 60 80 100 120 140 160 180 200 R FS (k:) C006 kHz R 10 10 f FS 6 SW K TPS92511 SNVS901A – MARCH 2014 – REVISED MAY 2014 www.ti.com Feature Description (continued) 7.3.4 Internal Regulator The TPS92511 integrates an internal voltage regulator for powering internal circuitry. For stability, an external capacitor CVCC of at least 1 μF should be connected between the VCC and PGND pins The output of the internal regulator VCC is 5.4V when VIN is larger than 6V. If VIN is lower than 6V, VCC decreases. The TPS92511 will trigger the VCC under-voltage lock-out if VCC falls below typically 3.5V. VCC can be used to bias external circuits subject to a loading of maximum 2 mA, while it has a short circuit current limit at typically 16 mA. 7.3.5 Setting The Switching Frequency The switching frequency fSW of the TPS92511 is programmable in the range of 50 kHz to 500 kHz by a single resistor RFS connecting the FS pin and ground. The following equation shows the relationship between fSW and RFS: (1) Figure 16 plots fsw against RFS. Table 1 shows values of RFS for commonly used switching frequencies. Figure 16. Switching Frequency vs RFS Table 1. Commonly Used fSW And RFS fSW (kHz) RFS (kΩ) 50 200 100 100 300 33.2 500 20 7.3.6 Setting The LED Current The LED current ILED of the TPS92511 is programmable by a single resistor RIADJ connecting the IADJ pin and ground. The IADJ pin is internally biased to 1.25 V. Equation 2 shows the relationship between ILED and RIADJ: (2) To ensure stability, RIADJ must be less that 30 kΩ, implying a minimum ILED of 50 mA can be programmed. The tolerance of ILED of 150 mA is shown in the ELECTRICAL CHARACTERISTICS. Larger tolerance should be expected for lower ILED. Figure 17 plots ILED against RIADJ. Table 2 shows values of RIADJ for commonly used ILED. 12 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: TPS92511 |
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