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TPS60250RTET Datasheet(PDF) 10 Page - Texas Instruments |
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TPS60250RTET Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page x1 Operating Area x1.5 Operating Area V I V I V O VA VF VDX CP WLEDDriver VB VC VHYS TPS60250 TPS60252 SLVS769C – APRIL 2007 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com Figure 13. Input Voltage Hysteresis Between ×1 and ×1.5 Mode As shown in Figure 13, there is input hysteresis voltage between 1 × and 1.5× mode to ensure stable operation during mode transition. For the 1 cell Li-Ion battery input voltage range, the TPS6025/2 operate in 1 × mode when a fully charged battery is installed. Once the battery voltage drops below the VB level, which is the mode transition voltage from 1 × to 1.5×, the WLED driver operates in 1.5× mode. Once in 1.5× mode, the battery voltage must rise to the VC level in order to transition from 1.5× to 1×. This hysteresis ensures stable operation when there is some input voltage fluctuation at the 1 ×/1.5× mode transition. The transition voltage, VB, depends on VDX (the mode transition threshold voltage), VF (WLED forward voltage drop) and VA (the drop out voltage of the charge pump stage) and is calculated as follows: VB = VA + VF + VDX VA = ROUT1X × ILEDTOTAL Where ROUT1X is the 1× mode output impedance of the IC. See the Electrical Characteristics table for output impedance specifications. The TPS60250/2 switch up to 1.5 × mode when the input voltage is below V B and remain in 1.5× mode as long as the input is lower than VC. 1.5× Mode is exited when the input voltage rises above VC. VC is calculated as: VC = VF + 550 mV The input voltage mode transition hysteresis voltage (VHYS) between 1× and 1.5× is calculated using the following equation. VHYS = VC – VB = 550 mV – VDX – VA, where VDX = 100mV Note that VA is the key factor in determining VHYS and is dependant on the 1× mode charge pump output impedance and WLED current. 10 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Link(s): TPS60250 TPS60252 |
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