TPS60252RTER datasheet(10/25 Pages) TI

No. de pieza	TPS60252RTER

Descripción Electrónicos	HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE

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Fabricante Electrónico	TI [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

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

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