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TPS60251 Fiches technique(PDF) 3 Page - Texas Instruments |
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TPS60251 Fiches technique(HTML) 3 Page - Texas Instruments |
3 / 28 page www.ti.com TPS60251 SLVS767 – APRIL 2007 ELECTRICAL CHARACTERISTICS (continued) V I = 3.5 V, TA = –40°C to 85°C, RIS = 562 kΩ, typical values are at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VUVLO2 UVLO Threshold voltage2(2) VI falling 1.2 1.3 1.5 V Vhys Under-voltage lockout hysterisis UVLO1 210 mV VENA_H Enable high threshold voltage 1.5 VI V VENA_L Enable low threshold voltage 0.4 V VI = 3 V, CO = 1 µF, TS Soft start time(3) 0.5 ms IMAIN_LED = 15 mA × 4 CHARGE PUMP Vout Overvoltage limit 6.5 V Fs Switching frequency 750 kHz ×1 Mode, (V I– VO)/IO 1.2 RO Open loop output impedance Ω × 1.5 Mode, (V I× 1.5 – VO)/IO VI = 3.0V (IO = 3.5 5.0 120mA) CURRENT SINK Current matching of sub LEDs at light ISUB_LED = 100 µA × 2, VDXX = 0.4 V Km_sub 0 ±2% load condition(4) IMAIN_LED = 15 mA × 4, Km_main LED to LED Current matching(5) ±1% ±5% 3.0 V ≤ V I ≤ 4.2 V Ka Current accuracy ILED = 15 mA ±6% Main and Sub Display Current Register = Maximum LED current of DM1-4 and ID_MS 0 ×01&2(111111), 25.5 mA DS1-2 VDXX = 0.2 V Aux Display Current Register = 0 ×03 ID_DM5 Maximum LED current of DM5 80 mA (XXXX11), VDM5 = 0.4 V VIS IS Pin voltage 3.0V ≤ V I≤ 6.0V 1.229 1.254 1.279 V ILED = 100 µA(6) 44.8 Output current to current set ratio sub Isub LEDs 6722 ILED = 15 mA(6) 44.8 ILED = 100 µA(6) Output current to current set ratio main Imain LEDs 6722 ILED = 15 mA(6) IDM5 Output current to current set ratio DM5 35853 ILED = 80 mA(6) VDropOut LED Drop out voltage See (7) 80 120 mV 1 × Mode to 1.5× mode transition VDXX Falling, 15 mA × 4 measured on the VTH_GU 85 100 120 mV threshold voltage(8) lowest VDXX Input voltage hysteresis for 1.5 × to 1× Measured as VI– (VO– VDXX_MIN), IMAIN_LED = 15 VTH_GD 470 mV mode transition mA × 4 SERIAL INTERFACE TIMING REQUIREMENTS fmax Clock frequency 400 kHz twH(HIGH) Pulse duration, clock high time 600 ns twL(LOW) Pulse duration, clock low time 1300 ns tr DATA and CLK rise time 300 ns tf DATA and CLK fall time 300 ns High time (repeated) START th(STA) condition(after this period the first clock 600 ns pulse is generated) Setup time for repeated START tsu(STA) 600 ns condition th(DATA) Data input hold time 0 ns (2) Shut down completely and come up with all 0's after device restart (3) Measurement Condition: From enabling the LED driver to 90% output voltage after VI is already up. (4) LED current matching is defined as: (ISUB_LED_WORST – IAVG_SUB) / IAVG_SUB (5) LED to LED Current Matching is defined as: (IMAIN_LED_WORST – IAVG_MAIN) / IAVG_MAIN (6) See the Setting the LED Current section of the data sheet for details on calculating LED current given by dimming step and RIS. (7) Dropout Voltage is defined as VDXX (WLED Cathode) to GND voltage at which current into the LED drops 10% from the LED current at VDXX = 0.2 V, WLED current = 15 mA × 4. (8) As VI drops, VDXX eventually falls below the switchover threshold of 100mV, and TPS60251 switches to 1.5× mode. See the Operating Principle section for details about the mode transition thresholds. 3 Submit Documentation Feedback |
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