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TPS60251RTW Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS60251RTW
Description  HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE
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TPS60251RTW Fiches technique(HTML) 11 Page - Texas Instruments

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x1 Operating
Area
x1.5 Operating
Area
V
I
V
I
V
O
VA
VF
VDX
CP WLEDDriver
VB
VC
VHYS
TPS60251
SLVS767 – APRIL 2007
APPLICATION INFORMATION (continued)
Figure 13. Input Voltage Hysteresis Between
×1 and ×1.5 Mode
As shown in Figure 13, there is input voltage 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 TPS60251 operates 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 WLED driver provides a typical
280mV hysteresis voltage (VHYS) that changes based on LED current, to prevent oscillating between modes.
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 TPS60251 switches to 1.5
× mode when the input voltage is below V
B and remains 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 + 470 mV
The input voltage mode transition hysteresis voltage (VHYS) between 1× and 1.5× is calculated using the
following equation.
VHYS = VC– VB = 470 mV – VDX– VA, where VDX = 100 mV
Note that VA is the key factor in determining VHYS and is dependant on the 1× mode charge pump output
impedance and WLED current.
11
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