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TPS92515HV Datasheet(PDF) 11 Page - Texas Instruments |
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TPS92515HV Datasheet(HTML) 11 Page - Texas Instruments |
11 / 39 page OFT IADJ LED OFF OFF LED LED SENSE V V V R C ln 1 V 10 I R 2L ª º ª º ª º ª º ª º « » « » « » « » « » « » ¬ ¼ « » ¬ ¼ ¬ ¼ « » « » « » « » ¬ ¼ « » ¬ ¼ IADJ OFF OFF LED SENSE V C R (1V) 10 I R 2 L OFF OFF LED LED OFF OFF LED L PP C R (1V) V V C R (1V) V dt Vdt I L L L L ª º « » ¬ ¼ ' OFF OFF OFF LED LED OFF C (1V) C R (1V) Cdv dt i V V R ª º « » ¬ ¼ 65 Input Voltage (V) Maximum Output Voltage (V) 0 VIN/2 11 TPS92515, TPS92515-Q1, TPS92515HV, TPS92515HV-Q1 www.ti.com SLUSBZ6A – APRIL 2016 – REVISED AUGUST 2016 Product Folder Links: TPS92515 TPS92515-Q1 TPS92515HV TPS92515HV-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Feature Description (continued) Fixed input voltage Figure 12. Frequency vs LED Output Voltage Fixed LED voltage Figure 13. Frequency vs Input Voltage (VIN) By making the OFF-time proportional to the output voltage, it is possible to illustrate how VLED can be removed from the output current equation. When VLED >> VOFT , the output ripple can be defined as shown in Equation 1. ΔIL-PP = (VLED x dt)/L where • dt is defined by the OFF-timer (1) . (2) Substitute dt in Equation 1 to create Equation 3. (3) (4) When VLED >≈ 10 V, use the ILED calculation Equation 4. The Detailed Design Procedure section describes a design example that uses the more detailed equation. A VLED > 10 V ensures a linear charging ramp below 1 V. If VLED <≈10 V, use Equation 5 that considers the exponential charging characteristic. (5) Because the control method relies on thresholds to control the main switch, offsets and delays must also be considered when examining the output accuracy. The ILED equation can be expanded to include these error sources as shown in Equation 6. ILED equations include several passive components, so it is important to consider the tolerance of each component. The VCST_Offset parameter is the variation in the VCST threshold between the typical and maximum or minimum values as defined in the Electrical Characteristics table. |
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