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TPS60255RTET Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza TPS60255RTET
Descripción Electrónicos  HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs DRIVER WITH 1 WIRE INTERFACE
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Fabricante Electrónico  TI1 [Texas Instruments]
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TPS60255RTET Datasheet(HTML) 3 Page - Texas Instruments

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TPS60255
SLVS825 – MARCH 2008
ELECTRICAL CHARACTERISTICS (continued)
VI = 3.5 V, TA = –40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VENA_H
Enable high threshold voltage
1.5
VIN
V
VENA_L
Enable low threshold voltage
0.4
V
TS
Soft start time(3)
0.5
ms
CHARGE PUMP
VOUT
Overvoltage limit
6.6
V
Fs
Switching frequency
625
750
875
kHz
1
× Mode, (V
IN –VO) ÷ IO
1.0
1.2
RO
Open loop output impedance
1.5
× Mode, (V
IN × 1.5 – VO) ÷ IO
2.8
3.5
VIN = 3.1 V, IO = 230 mA
CURRENT SINK
Current matching of Group B at light load
TA = 0° to 40°C, IGB_LED = 100 µA × 2
Km_GB
±0.1
±2
%
condition (4)
3.1 V
≤ VIN ≤ 4.2 V, VDX= 0.4 V
LED to LED current matching of Group A
IGAB_LED = 15.3 mA × 6
Km
±0.1
±5
%
and B (6 LEDs) (4)
3.1V
≤ VIN ≤ 4.2 V
ILED = 15.3 mA
±10
Ka
Current accuracy
%
ILED = 1.0 mA, TA = 25°C
±15
Maximum LED current of
IG_AB_M
VGX = 0.2 V
21.5
25.2
28.9
mA
GA1-4 and GB1-2
IGC_M
Maximum LED current of GC
VGX = 0.2 V
80
mA
VDropOut
LED Drop out voltage
See table note (5)
60
100
mV
1
× Mode to 1.5× mode transition
VGX falling, measured on the lowest
VTH_GU
105
120
mV
threshold voltage(6)
VGX , IO = 61 mA
1.5
× mode to 1× mode
Measured as VIN-(Vout-VGX_MIN)
VTH_GD
520
550
590
mV
Transition threshold voltage
IO = 61 mA
INTERFACE TIMING
tStart
Start time
3.5
µs
High Time Low Bit,
tH_LB
Signal level on IF pin is > 1.2 V
3.5
300
µs
logic 0 detection
Low Time Low Bit,
tL_LB
Signal level on IF pin < 0.4V
2
× t
H_LB
600
µs
logic 0 detection
tL_HB
Low Time High Bit, logic 1 detection
Signal level on IF pin < 0.4V
3.5
300
µs
High Time High Bit,
tH_HB
Signal level on IF pin is > 1.2 V
2
× t
L_HB
600
µs
logic 1 detection
tEOS
End of Stream
tEOS
3.5
600
µs
Duration of Acknowledge Condition (IF
tACKN
VIN 2.7 V to 6 V
600
750
µs
line pulled low by the device)
tvalACK
Acknowledge Valid Time
3.5
µs
(3)
Measurement Condition: From enabling the LED driver to 90% output voltage after VIN is already up.
(4)
LED current matching is defined as: |(I - IAVG)| max / IAVG
(5)
Dropout Voltage is defined as VGX (LED cathode) to GND voltage at which current into the LED drops 10% from the LED current at
VGX = 0.2 V.
(6)
As VIN drops, VGX eventually falls below the switchover threshold of 100 mV, and TPS60255 switches to 1.5× mode. See the Operating
Principle section for details about the mode transition thresholds.
Copyright © 2008, Texas Instruments Incorporated
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